FICUS syndrome

Psychiatric Psychiatric Disease

This entry describes the psychiatric PICS-F concept in ICU family members. Note: MONDO:0978296 refers to a genetic dysmorphology syndrome (OMIM 621193), not the PICS-F condition described here.

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Mappings
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Definitions
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Inheritance
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Pathophysiology
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Histopathology
14
Phenotypes
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Pathograph
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Genes
1
Treatments
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Subtypes
3
Differentials
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Datasets
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Trials
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Models
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Literature
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Phenotypes

14
Nervous System 11
Anxiety symptoms Anxiety (HP:0000739)
Show evidence (1 reference)
DOI:10.1038/s41598-024-53968-3 SUPPORT
"The prevalence of anxiety symptoms, depression, and posttraumatic stress disorder (PTSD) was higher in families of patients diagnosed with ICU delirium within 48 h of admission to the ICU."
This statement directly reports anxiety symptoms in family members of ICU patients.
Depressive symptoms Depression (HP:0000716)
Show evidence (1 reference)
DOI:10.1055/s-0043-1769933 SUPPORT
"The symptoms of anxiety were present in 44/84 (52.4%), and depression was present in 57/84 (67.9%) family members."
This documents depressive symptoms in ICU family members.
Posttraumatic stress symptoms Posttraumatic stress symptom (HP:0033676)
Show evidence (1 reference)
DOI:10.1038/s41598-024-53968-3 SUPPORT
"The prevalence of anxiety symptoms, depression, and posttraumatic stress disorder (PTSD) was higher in families of patients diagnosed with ICU delirium within 48 h of admission to the ICU."
This indicates PTSD-related symptoms in family members during ICU admission.
Anger Anger (HP:0031473)
Show evidence (1 reference)
DOI:10.1038/s41598-024-53968-3 PARTIAL
"Taking appropriate actions and thus providing families with appropriate support will contribute to the understanding of unfavorable emotional states, including anxiety, stress, depression, anger, agitation, or avoidance."
This statement lists anger among emotional states experienced by ICU family members.
Agitation Agitation (HP:0000713)
Show evidence (1 reference)
DOI:10.1038/s41598-024-53968-3 PARTIAL
"Taking appropriate actions and thus providing families with appropriate support will contribute to the understanding of unfavorable emotional states, including anxiety, stress, depression, anger, agitation, or avoidance."
This statement lists agitation among emotional states experienced by ICU family members.
Avoidance of stimuli associated with traumatic event Avoidance of stimuli associated with traumatic event (HP:0032942)
Show evidence (1 reference)
DOI:10.1038/s41598-024-53968-3 PARTIAL
"Taking appropriate actions and thus providing families with appropriate support will contribute to the understanding of unfavorable emotional states, including anxiety, stress, depression, anger, agitation, or avoidance."
This statement explicitly mentions avoidance as an emotional response in ICU family members.
Abnormal fear-induced behavior Abnormal fear-induced behavior (HP:0100852)
Show evidence (1 reference)
DOI:10.1055/s-0043-1769933 PARTIAL
"The common feelings of all the interviewees were desperation and fear."
Family members described fear during the ICU process, consistent with abnormal fear-related behavior.
Sleep disturbance Sleep disturbance (HP:0002360)
Show evidence (1 reference)
PMID:40161896 PARTIAL
"The sleep disturbances, fatigue, anxiety, and depression were assessed using the Pittsburgh Sleep Quality Index, the Subscale of Fatigue Assessment Instrument, and the Hospital Anxiety and Depression Scale, respectively."
This PICS-F study identifies sleep disturbance as a key symptom domain assessed in ICU family members.
Memory impairment Memory impairment (HP:0002354)
Show evidence (1 reference)
DOI:10.1055/s-0043-1769933 PARTIAL
"All interviewees stated having difficulty understanding and remembering what was told."
Family members reported difficulty remembering information during the ICU process, consistent with memory impairment.
Recurrent, involuntary, and intrusive distressing memories Recurrent, involuntary, and intrusive distressing memories (HP:0032937)
Show evidence (1 reference)
PMID:39023049 PARTIAL
"Tendencies to view the patient's death as unexpected may contribute to intrusive thoughts and memories of the ICU experience."
This describes intrusive thoughts and memories in ICU family caregivers, matching intrusive distressing memories.
Hopelessness Hopelessness (HP:5200271)
Show evidence (1 reference)
DOI:10.1055/s-0043-1769933 PARTIAL
"The common feelings of all the interviewees were desperation and fear."
Desperation aligns with hopelessness reported by ICU family members.
Constitutional 3
Fatigue Fatigue (HP:0012378)
Show evidence (1 reference)
PMID:40161896 PARTIAL
"The sleep disturbances, fatigue, anxiety, and depression were assessed using the Pittsburgh Sleep Quality Index, the Subscale of Fatigue Assessment Instrument, and the Hospital Anxiety and Depression Scale, respectively."
This PICS-F study includes fatigue as a key symptom domain in ICU family members.
Diminished health-related quality of life Diminished health-related quality of life (HP:0033665)
Show evidence (1 reference)
DOI:10.1186/s13613-025-01420-8 SUPPORT
"Almost one-third of the family members of ICU survivors reported persistent psychological symptoms and QoL problems at 12-months."
This supports diminished health-related quality of life in family members after ICU discharge.
Pain Pain (HP:0012531)
Show evidence (1 reference)
DOI:10.1186/s13613-025-01420-8 PARTIAL
"> 30% reported problems in pain/discomfort or anxiety/depression domains at 12-months."
This indicates pain/discomfort problems reported by ICU family members at 12 months.
💊

Treatments

1
Family support intervention
Action: behavioral counseling MAXO:0000077
Nurse-led, interprofessional family support intervention aimed at improving family management, quality of care, and mental health for ICU family members.
Show evidence (1 reference)
DOI:10.1186/s13063-024-08351-y SUPPORT
"The FICUS trial is a cluster-randomized superiority trial to determine the effectiveness of a nurse-led, interprofessional family support intervention (FSI) on the quality of care, family management and individual mental health of family members of critically ill patients, compared to usual care."
This describes a structured family support intervention targeting mental health outcomes.
🌍

Environmental Factors

1
ICU admission exposure and family stressor
intensive care unit link
ICU admission and exposure to critical illness in a close family member act as a major psychosocial stressor for relatives.
Show evidence (3 references)
DOI:10.1038/s41598-024-53968-3 SUPPORT
"During intensive care unit admission, relatives of critically ill patients can experience emotional distress."
ICU admission is directly associated with emotional distress in family members, reflecting the environmental stressor context.
PMID:29277171 SUPPORT
"Family members of critically ill patients can suffer symptoms of post-intensive care syndrome-family (PICS-F), including anxiety, depression, and posttraumatic stress disorder (PTSD) with a diminished quality of life."
This explicitly links ICU patient critical illness to family psychological symptoms, supporting the ICU exposure stressor context.
PMID:35795400 SUPPORT
"PICS-F refers to the psychologic distress such as anxiety, depression, and posttraumatic stress disorder (PTSD) experienced by the patient's family."
This defines family psychological distress tied to ICU patient illness, reinforcing ICU exposure as a key environmental stressor.
🔀

Differential Diagnoses

3

Conditions with similar clinical presentations that must be differentiated from FICUS syndrome:

Post-traumatic stress disorder Not Yet Curated MONDO:0005146
Overlapping Features Psychiatric disorder characterized by intrusive memories, avoidance, negative mood/cognition changes, and hyperarousal after trauma exposure.
Distinguishing Features
  • PTSD is a formal trauma-related psychiatric diagnosis; FICUS is a syndrome tied to ICU family caregiving context.
  • PTSD may occur without the broader multi-domain family-caregiving context captured in FICUS.
Show evidence (1 reference)
PMID:30950647 SUPPORT
"The prevalence of psychological outcomes in family caregivers ranged from 4% to 94% for depression, 2% to 80% for anxiety, and 3% to 62% for PTSD."
This review documents PTSD prevalence in ICU family caregivers, supporting consideration of PTSD as a differential.
Major depressive disorder MONDO:0002009
Overlapping Features Depressive disorder characterized by persistent low mood, anhedonia, and functional impairment not necessarily linked to ICU caregiving.
Distinguishing Features
  • MDD can occur independent of ICU exposure, whereas FICUS is defined by the ICU family context.
  • FICUS often includes multiple symptom domains beyond depression alone.
Show evidence (1 reference)
PMID:30950647 SUPPORT
"The prevalence of psychological outcomes in family caregivers ranged from 4% to 94% for depression, 2% to 80% for anxiety, and 3% to 62% for PTSD."
The review shows depression is common in ICU family caregivers, motivating differential consideration with MDD.
Generalized anxiety disorder MONDO:0001942
Overlapping Features Anxiety disorder with excessive, persistent worry across domains, distinct from context-specific ICU caregiver stress.
Distinguishing Features
  • GAD is a chronic anxiety disorder that can predate ICU exposure.
  • FICUS-related anxiety is situational and tied to the ICU caregiving context.
Show evidence (1 reference)
PMID:30950647 SUPPORT
"The prevalence of psychological outcomes in family caregivers ranged from 4% to 94% for depression, 2% to 80% for anxiety, and 3% to 62% for PTSD."
The review reports anxiety prevalence in ICU family caregivers, supporting GAD as a differential diagnosis.
🔬

Clinical Trials

4
NCT05280691
Cluster-randomized superiority trial of a multicomponent, nurse-led family support intervention in adult intensive care units.
Show evidence (1 reference)
clinicaltrials:NCT05280691 SUPPORT
"The primary study endpoint is quality of family care, operationalized as family members' satisfaction with ICU care at discharge."
This trial evaluates a family support intervention and targets family outcomes relevant to FICUS.
NCT04316767
Pilot study of a smartphone self-care app delivering cognitive behavioral therapy to reduce psychological symptoms in ICU family members.
Show evidence (1 reference)
clinicaltrials:NCT04316767 SUPPORT
"This study will examine the effectiveness of a smartphone self-care app delivering cognitive behavioral therapy in decreasing the psychological symptoms suffered by ICU family members."
This trial targets psychological symptoms in ICU family members using a CBT-based intervention.
NCT04839406
Randomized controlled trial of a systematic follow-up intervention for caregivers of critically ill patients over 12 months.
Show evidence (1 reference)
clinicaltrials:NCT04839406 SUPPORT
"The aim of the project is to test the efficacy of a systematic intervention for individual follow-up of caregivers at the intensive care unit during a 12 month randomized controlled trial."
This trial evaluates an ICU caregiver follow-up intervention aligned with FICUS care needs.
NCT07228299
Multicenter RCT evaluating chaplain-delivered spiritual care for ICU family surrogates using the SCAI framework.
Show evidence (1 reference)
clinicaltrials:NCT07228299 SUPPORT
"The overarching goal of our work is to test the effect of high-quality spiritual care for ICU family surrogates on outcomes of psychological and spiritual well-being and medical decision making."
This trial targets psychological and spiritual outcomes in ICU family surrogates, relevant to FICUS.
📚

Literature Summaries

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Disorder ▸

Disorder

  • Name: FICUS syndrome
  • Category: Psychiatric
  • Existing deep-research providers: falcon
  • Existing evidence reference count in YAML: 31

Key Pathophysiology Nodes

  • Deep research literature mapping

Citation Inventory (for evidence mapping)

  • DOI:10.1038/s41598-024-53968-3
  • DOI:10.1055/s-0043-1769933
  • DOI:10.1186/s12913-023-10285-1
  • DOI:10.1186/s13063-024-08351-y
  • DOI:10.1186/s13613-025-01420-8
  • DOI:10.4103/ijnmr.ijnmr_243_19
  • DOI:10.4103/ijnmr.ijnmr_243_19
Falcon ▸
Pathophysiology description
Edison Scientific Literature 31 citations 2026-01-26T09:40:43.049975

Pathophysiology description Current understanding frames FICUS as a multidimensional syndrome comprising psychological, physical, and social impairments in family members during and after a loved one’s ICU admission. It overlaps conceptually with Post-Intensive Care Syndrome–Family (PICS‑F). There is no established molecular or cellular mechanism; rather, observed phenomena reflect stress-related psychological responses, sleep disruption, decision burden, and care-process factors within ICU settings (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19; Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (moradian2020familyintensivecare pages 3-4, kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3).

  • Definitional status: “There is no universal definition for the term ‘FICUS’ in the research literature,” and specialized measurement tools are lacking (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 1-2, moradian2020familyintensivecare pages 7-8).
  • Symptom domains: Anxiety, depression, post‑traumatic stress symptoms, complicated grief, sleep disorders, stress, fatigue; cognitive and decision‑making difficulties are described (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 3-4, moradian2020familyintensivecare pages 6-7).
  • Process factors: Family exposure to patient delirium, high illness severity, invasive devices, and acute-onset illness are associated with higher symptom burden; these are context/care-process correlates, not molecular pathways (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3; Apr 2023; https://doi.org/10.1055/s-0043-1769933) (kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3, gurbuz2023anxietyanddepression pages 2-3).

Core Pathophysiology - Primary mechanisms: psychosocial stress responses to critical illness of a loved one; sleep disruption; information needs and communication challenges; surrogate decision-making load; exposure to distressing ICU phenomena (e.g., delirium) (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19; Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (moradian2020familyintensivecare pages 5-6, moradian2020familyintensivecare pages 6-7, kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3). - Dysregulated “pathways”: No canonical molecular pathways identified; rather, validated psychological constructs (anxiety, depression, PTSD symptoms) measured with HADS, IES, and related instruments are used to characterize burden (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3; Apr 2023; https://doi.org/10.1055/s-0043-1769933) (kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3, gurbuz2023anxietyanddepression pages 2-3). - Affected cellular processes: Not applicable; FICUS is not defined by cellular pathobiology (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 7-8).

Key Molecular Players - Genes/Proteins (HGNC): None implicated; no genetic etiology has been reported (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 7-8). - Chemical Entities (ChEBI): Not applicable to etiology or treatment; research focuses on nonpharmacologic, family‑support interventions (Aug 2024; https://doi.org/10.1186/s13063-024-08351-y) (felten2024multicomponentfamilysupport pages 1-2, felten2024multicomponentfamilysupport pages 2-3, felten2024multicomponentfamilysupport pages 10-11). - Cell Types (CL): Not applicable. - Anatomical Locations (UBERON): Not applicable.

Biological Processes (for GO annotation) Because FICUS is not a biological disease entity with molecular pathogenesis, GO biological process annotations are not appropriate. Published work operationalizes FICUS/PICS‑F using psychological symptom instruments (e.g., HADS, IES) rather than cellular or molecular processes (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3; Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (kotfis2024thespectrumof pages 1-2, moradian2020familyintensivecare pages 7-8).

Cellular Components Not applicable; there are no established cellular-localization mechanisms for FICUS (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 7-8).

Disease Progression - Initial trigger: ICU admission of a loved one; family exposure to high acuity care, uncertainty, and potential end-of-life decisions (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 3-4, moradian2020familyintensivecare pages 6-7). - Early phase: Elevated anxiety, depression, sleep disturbance, acute stress within 48 hours to days of ICU admission; higher in families of delirious patients (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3). - Subacute phase: Symptoms may persist at 30 days; higher PTSD scores have been observed in families of patients with delirium compared with non-delirium cohorts (mean PTSD score ~11.0 vs ~6.4 at day 30; p<0.001) (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (kotfis2024thespectrumof pages 1-2). - Long-term phase: A substantial proportion of family members report persistent psychological symptoms and QoL impairments at 3–12 months after ICU discharge, with dyadic associations to the survivor’s symptoms (Jan 2025; https://doi.org/10.1186/s13613-025-01420-8) (rai2025psychologicalsymptomsquality pages 1-2).

Phenotypic Manifestations - Clinical phenotypes (PICS‑F domain): Anxiety (HADS), depression (HADS), PTSD symptoms (IES/PTSD‑C), sleep disturbance, fatigue, impaired decision-making; prevalence ranges reported include anxiety up to ~70%, depression ~35–70%, and PTSD ~33–54%, with variability across settings and measures (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19; Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (moradian2020familyintensivecare pages 1-2, kotfis2024thespectrumof pages 2-3, moradian2020familyintensivecare pages 3-4). - 2023–2024 quantitative data: - 2023 prospective cohort (Turkey): 84 families; anxiety symptoms in 52.4% and depression in 67.9%; higher odds with nasogastric tube presence and acute illness; greater depression when the patient died in ICU (Apr 2023; https://doi.org/10.1055/s-0043-1769933) (gurbuz2023anxietyanddepression pages 2-3). - 2024 prospective study (Poland): At 30 days, families of delirious patients had higher PTSD scores (IES total; p=0.001) and higher intrusion/hyperarousal than controls; assessments at 48 h and 30 days (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (kotfis2024thespectrumof pages 1-2). - 2025 multicenter cohort (Australia): Approximately one‑third of family members had persistent psychological symptoms and QoL problems at 12 months; strong dyadic associations with patient symptoms (Jan 2025; https://doi.org/10.1186/s13613-025-01420-8) (rai2025psychologicalsymptomsquality pages 1-2).

Predictors and Correlates - Demographic/contextual: Female gender, low education, having a critically ill spouse/close relationship, lower resources/support, information deficits, younger age; care-process factors (acute onset illness, higher severity, invasive devices, delirium exposure) (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19; Apr 2023; https://doi.org/10.1055/s-0043-1769933; Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (moradian2020familyintensivecare pages 6-7, gurbuz2023anxietyanddepression pages 2-3, kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3). - Baseline mental health: Prior anxiety/depression or acute stress increases risk (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 3-4).

Recent developments and latest research (prioritized 2023–2024) - FICUS Trial (implementation and SAP): A multicomponent, nurse‑led interprofessional family support intervention is being evaluated in a cluster‑randomized superiority trial across 16 ICUs (8 per arm). Primary outcome is family satisfaction with ICU care (FS‑ICU‑24R) at discharge; secondary outcomes include quality of communication (QQPPI‑14), nurse support (ICE‑FPSQ‑14), and longitudinal HADS and IES measures at 3, 6, and 12 months. Recruitment completed January 2024; final follow‑up early 2025. Registered at ClinicalTrials.gov (NCT05280691; registered Feb 20, 2022). Statistical analysis plan specifies LMMs with cluster random effects and visit×treatment interactions; adherence requires ≥5 intervention contacts covering all core components (Aug 2024; https://doi.org/10.1186/s13063-024-08351-y) (felten2024multicomponentfamilysupport pages 1-2, felten2024multicomponentfamilysupport pages 2-3, felten2024multicomponentfamilysupport pages 7-9, felten2024multicomponentfamilysupport pages 10-11). - Observational evidence 2023–2024: Prospective studies quantify high anxiety/depression burdens and show increased PTSD symptoms among families of delirious patients; qualitative work highlights unmet needs and the importance of communication and support (Apr 2023; https://doi.org/10.1055/s-0043-1769933; Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (gurbuz2023anxietyanddepression pages 2-3, kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3).

Current applications and real-world implementations - ICU family‑support programs: The FICUS multicomponent intervention operationalizes early engagement, psycho‑educational/relationship‑focused conversations, and structured interprofessional communication/shared decision-making, led by designated family nurses—now being implemented in a multicenter trial with tailored implementation strategies reported in 2023 (Dec 2023; https://doi.org/10.1186/s12913-023-10285-1) (felten2024multicomponentfamilysupport pages 2-3, felten2024multicomponentfamilysupport pages 11-12). - Routine assessment: Use of HADS, IES, and PTSD‑related scales to screen family members for distress within 48 h of ICU admission and in follow‑up, particularly when patients have delirium (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3).

Expert opinions and analysis from authoritative sources - Integrative review: Emphasizes lack of universal definition, the breadth of symptom domains, and need for standardized tools and interventions; positions FICUS within a broader PICS‑F framework and calls for time‑framed prevention and management plans (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 5-6, moradian2020familyintensivecare pages 7-8). - Contemporary prospective studies with senior PICS/PICS‑F experts: The 2024 Scientific Reports study (co‑authored by E. Wesley Ely) underscores that family members have substantial early and persistent PTSD/anxiety/depression burdens and argues for proactive support strategies (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3).

Relevant statistics and data from recent studies - Anxiety/depression prevalence: 52.4% anxiety and 67.9% depression among family members in a 2023 prospective cohort; odds of anxiety/depression elevated with nasogastric tube and acute illness; higher depression if the patient died in ICU (Apr 2023; https://doi.org/10.1055/s-0043-1769933) (gurbuz2023anxietyanddepression pages 2-3). - PTSD symptom burden: Mean IES‑PTSD higher in families of delirious vs non‑delirious patients at 30 days (11.02 vs 6.42; p<0.001); increases in intrusion and hyperarousal domains observed (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (kotfis2024thespectrumof pages 1-2). - Long‑term outcomes: Nearly one‑third of family members report persistent psychological symptoms and QoL impairments at 12 months; strong dyadic associations with survivor symptoms (Jan 2025; https://doi.org/10.1186/s13613-025-01420-8) (rai2025psychologicalsymptomsquality pages 1-2).

Ontology and evidence mappings (knowledge-base style) - Gene/protein annotations (HGNC): None. - Biological processes (GO): Not applicable; no molecular pathway evidence. - Cell type involvement (CL): Not applicable. - Anatomical locations (UBERON): Not applicable. - Chemical entities (CHEBI): Not applicable. - Phenotype associations (HPO): Psychological symptom constructs are measured but not annotated as Mendelian phenotypes; commonly measured domains include Anxiety (HADS‑A), Depression (HADS‑D), and PTSD symptoms (IES), best represented as clinical scales rather than HPO terms (Feb 2024; https://doi.org/10.1038/s41598-024-53968-3; Apr 2023; https://doi.org/10.1055/s-0043-1769933) (kotfis2024thespectrumof pages 1-2, gurbuz2023anxietyanddepression pages 2-3).

Evidence items (with PMIDs/DOIs/URLs and dates) - Moradian et al., 2020 (Integrative review): Family Intensive Care Unit Syndrome lacks a universal definition; symptom domains include anxiety, depression, PTSD, sleep disturbance, stress, fatigue; calls for standardized tools (Published Sep 2020; DOI: 10.4103/ijnmr.ijnmr_243_19; URL: https://doi.org/10.4103/ijnmr.ijnmr_243_19) (moradian2020familyintensivecare pages 1-2, moradian2020familyintensivecare pages 7-8, moradian2020familyintensivecare pages 3-4, moradian2020familyintensivecare pages 5-6, moradian2020familyintensivecare pages 6-7). - Kotfis et al., 2024 (Prospective observational): Families of delirious patients have higher PTSD symptoms at 30 days; outlines use of HADS, IES, PTSD‑C, and links to PICS‑F literature (Published Feb 2024; DOI: 10.1038/s41598-024-53968-3; URL: https://doi.org/10.1038/s41598-024-53968-3) (kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3, kotfis2024thespectrumof pages 9-10). - Gurbuz & Demir, 2023 (Prospective observational): 52.4% anxiety, 67.9% depression among family members; risk factors include NG tube, higher severity, acute illness, and mortality (Published Apr 2023; DOI: 10.1055/s-0043-1769933; URL: https://doi.org/10.1055/s-0043-1769933) (gurbuz2023anxietyanddepression pages 2-3). - von Felten et al., 2024 (FICUS Trial SAP): Cluster‑randomized trial of a multicomponent, nurse‑led family support intervention; 16 ICU clusters; primary FS‑ICU‑24R; HADS/IES longitudinal assessments; registration NCT05280691; recruitment completed Jan 2024; follow‑up to early 2025 (Published Aug 2024; DOI: 10.1186/s13063-024-08351-y; URL: https://doi.org/10.1186/s13063-024-08351-y) (felten2024multicomponentfamilysupport pages 1-2, felten2024multicomponentfamilysupport pages 2-3, felten2024multicomponentfamilysupport pages 7-9, felten2024multicomponentfamilysupport pages 10-11, felten2024multicomponentfamilysupport pages 11-12). - Rai et al., 2025 (Multicenter longitudinal cohort): Approximately one‑third with persistent psychological symptoms and QoL problems at 12 months; dyadic associations between family and survivor symptoms (Published Jan 2025; DOI: 10.1186/s13613-025-01420-8; URL: https://doi.org/10.1186/s13613-025-01420-8) (rai2025psychologicalsymptomsquality pages 1-2).

Conclusion FICUS syndrome, as used in recent literature, is a psychosocial syndrome affecting families of ICU patients, not a genetic or molecularly defined disease. Mechanistic discussion should focus on psychological stress, communication/decision challenges, and care-process exposures such as delirium, rather than molecular pathways. Contemporary research emphasizes standardized assessment, targeted family-support interventions (e.g., the ongoing FICUS trial), and longitudinal monitoring of anxiety, depression, PTSD symptoms, and QoL. No MONDO/OMIM/Orphanet entries or gene/protein/cellular mechanisms are currently supported by the evidence base (Sep 2020; https://doi.org/10.4103/ijnmr.ijnmr_243_19; Aug 2024; https://doi.org/10.1186/s13063-024-08351-y; Feb 2024; https://doi.org/10.1038/s41598-024-53968-3) (moradian2020familyintensivecare pages 7-8, felten2024multicomponentfamilysupport pages 1-2, kotfis2024thespectrumof pages 1-2, kotfis2024thespectrumof pages 2-3).

References

  1. (moradian2020familyintensivecare pages 1-2): SeyedTayeb Moradian, Yaser Saeid, MohammadMahdi Salaree, and Abbas Ebadi. Family intensive care unit syndrome: an integrative review. Iranian Journal of Nursing and Midwifery Research, 25:361-368, Sep 2020. URL: https://doi.org/10.4103/ijnmr.ijnmr_243_19, doi:10.4103/ijnmr.ijnmr_243_19. This article has 54 citations and is from a poor quality or predatory journal.

  2. (moradian2020familyintensivecare pages 7-8): SeyedTayeb Moradian, Yaser Saeid, MohammadMahdi Salaree, and Abbas Ebadi. Family intensive care unit syndrome: an integrative review. Iranian Journal of Nursing and Midwifery Research, 25:361-368, Sep 2020. URL: https://doi.org/10.4103/ijnmr.ijnmr_243_19, doi:10.4103/ijnmr.ijnmr_243_19. This article has 54 citations and is from a poor quality or predatory journal.

  3. (moradian2020familyintensivecare pages 2-3): SeyedTayeb Moradian, Yaser Saeid, MohammadMahdi Salaree, and Abbas Ebadi. Family intensive care unit syndrome: an integrative review. Iranian Journal of Nursing and Midwifery Research, 25:361-368, Sep 2020. URL: https://doi.org/10.4103/ijnmr.ijnmr_243_19, doi:10.4103/ijnmr.ijnmr_243_19. This article has 54 citations and is from a poor quality or predatory journal.

  4. (moradian2020familyintensivecare pages 5-6): SeyedTayeb Moradian, Yaser Saeid, MohammadMahdi Salaree, and Abbas Ebadi. Family intensive care unit syndrome: an integrative review. Iranian Journal of Nursing and Midwifery Research, 25:361-368, Sep 2020. URL: https://doi.org/10.4103/ijnmr.ijnmr_243_19, doi:10.4103/ijnmr.ijnmr_243_19. This article has 54 citations and is from a poor quality or predatory journal.

  5. (moradian2020familyintensivecare pages 3-4): SeyedTayeb Moradian, Yaser Saeid, MohammadMahdi Salaree, and Abbas Ebadi. Family intensive care unit syndrome: an integrative review. Iranian Journal of Nursing and Midwifery Research, 25:361-368, Sep 2020. URL: https://doi.org/10.4103/ijnmr.ijnmr_243_19, doi:10.4103/ijnmr.ijnmr_243_19. This article has 54 citations and is from a poor quality or predatory journal.

  6. (kotfis2024thespectrumof pages 1-2): Katarzyna Kotfis, Patrycja Maj, Aleksandra Szylińska, Maria Pankowiak, Elżbieta Reszka, E. Wesley Ely, and Annachiara Marra. The spectrum of psychological disorders in family members of patients suffering from delirium associated with critical illness: a prospective, observational study. Scientific Reports, Feb 2024. URL: https://doi.org/10.1038/s41598-024-53968-3, doi:10.1038/s41598-024-53968-3. This article has 12 citations and is from a peer-reviewed journal.

  7. (kotfis2024thespectrumof pages 2-3): Katarzyna Kotfis, Patrycja Maj, Aleksandra Szylińska, Maria Pankowiak, Elżbieta Reszka, E. Wesley Ely, and Annachiara Marra. The spectrum of psychological disorders in family members of patients suffering from delirium associated with critical illness: a prospective, observational study. Scientific Reports, Feb 2024. URL: https://doi.org/10.1038/s41598-024-53968-3, doi:10.1038/s41598-024-53968-3. This article has 12 citations and is from a peer-reviewed journal.

  8. (moradian2020familyintensivecare pages 6-7): SeyedTayeb Moradian, Yaser Saeid, MohammadMahdi Salaree, and Abbas Ebadi. Family intensive care unit syndrome: an integrative review. Iranian Journal of Nursing and Midwifery Research, 25:361-368, Sep 2020. URL: https://doi.org/10.4103/ijnmr.ijnmr_243_19, doi:10.4103/ijnmr.ijnmr_243_19. This article has 54 citations and is from a poor quality or predatory journal.

  9. (gurbuz2023anxietyanddepression pages 2-3): Hande Gurbuz and Nalan Demir. Anxiety and depression symptoms of family members of intensive care unit patients: a prospective observational study and the lived experiences of the family members. Avicenna Journal of Medicine, 13:89-96, Apr 2023. URL: https://doi.org/10.1055/s-0043-1769933, doi:10.1055/s-0043-1769933. This article has 20 citations.

  10. (felten2024multicomponentfamilysupport pages 1-2): Stefanie von Felten, Miodrag Filipovic, Marie-Madlen Jeitziner, Lotte Verweij, Marco Riguzzi, and Rahel Naef. Multicomponent family support intervention in intensive care units: statistical analysis plan for the cluster-randomized controlled ficus trial. Trials, Aug 2024. URL: https://doi.org/10.1186/s13063-024-08351-y, doi:10.1186/s13063-024-08351-y. This article has 3 citations and is from a peer-reviewed journal.

  11. (felten2024multicomponentfamilysupport pages 2-3): Stefanie von Felten, Miodrag Filipovic, Marie-Madlen Jeitziner, Lotte Verweij, Marco Riguzzi, and Rahel Naef. Multicomponent family support intervention in intensive care units: statistical analysis plan for the cluster-randomized controlled ficus trial. Trials, Aug 2024. URL: https://doi.org/10.1186/s13063-024-08351-y, doi:10.1186/s13063-024-08351-y. This article has 3 citations and is from a peer-reviewed journal.

  12. (felten2024multicomponentfamilysupport pages 10-11): Stefanie von Felten, Miodrag Filipovic, Marie-Madlen Jeitziner, Lotte Verweij, Marco Riguzzi, and Rahel Naef. Multicomponent family support intervention in intensive care units: statistical analysis plan for the cluster-randomized controlled ficus trial. Trials, Aug 2024. URL: https://doi.org/10.1186/s13063-024-08351-y, doi:10.1186/s13063-024-08351-y. This article has 3 citations and is from a peer-reviewed journal.

  13. (rai2025psychologicalsymptomsquality pages 1-2): Sumeet Rai, Dale M. Needham, Rhonda Brown, Teresa Neeman, Krishnaswamy Sundararajan, Arvind Rajamani, Rakshit Panwar, Mary Nourse, Frank M. P. van Haren, and Imogen Mitchell. Psychological symptoms, quality of life and dyadic relations in family members of intensive care survivors: a multicentre, prospective longitudinal cohort study. Annals of Intensive Care, Jan 2025. URL: https://doi.org/10.1186/s13613-025-01420-8, doi:10.1186/s13613-025-01420-8. This article has 8 citations and is from a peer-reviewed journal.

  14. (felten2024multicomponentfamilysupport pages 7-9): Stefanie von Felten, Miodrag Filipovic, Marie-Madlen Jeitziner, Lotte Verweij, Marco Riguzzi, and Rahel Naef. Multicomponent family support intervention in intensive care units: statistical analysis plan for the cluster-randomized controlled ficus trial. Trials, Aug 2024. URL: https://doi.org/10.1186/s13063-024-08351-y, doi:10.1186/s13063-024-08351-y. This article has 3 citations and is from a peer-reviewed journal.

  15. (felten2024multicomponentfamilysupport pages 11-12): Stefanie von Felten, Miodrag Filipovic, Marie-Madlen Jeitziner, Lotte Verweij, Marco Riguzzi, and Rahel Naef. Multicomponent family support intervention in intensive care units: statistical analysis plan for the cluster-randomized controlled ficus trial. Trials, Aug 2024. URL: https://doi.org/10.1186/s13063-024-08351-y, doi:10.1186/s13063-024-08351-y. This article has 3 citations and is from a peer-reviewed journal.

  16. (kotfis2024thespectrumof pages 9-10): Katarzyna Kotfis, Patrycja Maj, Aleksandra Szylińska, Maria Pankowiak, Elżbieta Reszka, E. Wesley Ely, and Annachiara Marra. The spectrum of psychological disorders in family members of patients suffering from delirium associated with critical illness: a prospective, observational study. Scientific Reports, Feb 2024. URL: https://doi.org/10.1038/s41598-024-53968-3, doi:10.1038/s41598-024-53968-3. This article has 12 citations and is from a peer-reviewed journal.

{ }

Source YAML

click to show 
name: FICUS syndrome
creation_date: '2026-01-26T17:51:15Z'
updated_date: '2026-04-14T20:40:00Z'
category: Psychiatric
description: >
  This entry describes the psychiatric PICS-F concept in ICU family members.
  Note: MONDO:0978296 refers to a genetic dysmorphology syndrome (OMIM 621193),
  not the PICS-F condition described here.
parents:
- Psychiatric Disease
prevalence:
- population: ICU family members of COVID-19 patients (single-center, Japan)
  percentage: 33
  evidence:
  - reference: PMID:35795400
    reference_title: "Postintensive Care Syndrome-Family Associated With COVID-19 Infection."
    supports: SUPPORT
    snippet: "Overall PICS-F occurred in 33%."
    explanation: This study reports overall PICS-F occurrence among ICU family members of COVID-19 patients.
- population: Family decision-makers of critically ill patients (single-center, United States)
  percentage: 45.8
  evidence:
  - reference: PMID:29277171
    reference_title: "Post-intensive care syndrome symptoms and health-related quality of life in family decision-makers of critically ill patients."
    supports: PARTIAL
    snippet: "We found a significant prevalence of anxiety (45.8%), depression (25%), and PTSD (11.1%) symptoms among FDMs over the course of the study."
    explanation: This provides symptom prevalence estimates in family decision-makers during and after ICU admission.
epidemiology:
- name: Prevalence range of psychological outcomes in ICU family caregivers
  description: >
    Systematic review reporting wide ranges in prevalence estimates for
    depression, anxiety, and PTSD among family caregivers of critically ill
    ICU patients across studies.
  minimum_value: 2
  maximum_value: 94
  unit: percentage
  notes: Ranges reported across included studies; depression 4%–94%, anxiety 2%–80%, PTSD 3%–62%.
  evidence:
  - reference: PMID:30950647
    reference_title: "Psychological Sequelae in Family Caregivers of Critically III Intensive Care Unit Patients. A Systematic Review."
    supports: SUPPORT
    snippet: "The prevalence of psychological outcomes in family caregivers ranged from 4% to 94% for depression, 2% to 80% for anxiety, and 3% to 62% for PTSD."
    explanation: This provides prevalence ranges across studies for key psychological outcomes in ICU family caregivers.
- name: Risk factors for psychological outcomes in ICU family caregivers
  description: >
    Systematic review identifying common risk factors for adverse psychological
    outcomes among family caregivers of critically ill ICU patients.
  factors:
  - Younger caregiver age
  - Caregiver relationship to the patient
  - Lower socioeconomic status
  - Female sex
  evidence:
  - reference: PMID:30950647
    reference_title: "Psychological Sequelae in Family Caregivers of Critically III Intensive Care Unit Patients. A Systematic Review."
    supports: SUPPORT
    snippet: "Common risk factors identified for adverse psychological outcomes included younger caregiver age, caregiver relationship to the patient, lower socioeconomic status, and female sex."
    explanation: This review lists common risk factors associated with psychological outcomes in ICU family caregivers.
pathophysiology: []
phenotypes:
- name: Anxiety symptoms
  category: Psychiatric
  phenotype_term:
    preferred_term: Anxiety
    term:
      id: HP:0000739
      label: Anxiety
  evidence:
  - reference: DOI:10.1038/s41598-024-53968-3
    supports: SUPPORT
    snippet: "The prevalence of anxiety symptoms, depression, and posttraumatic stress disorder (PTSD) was higher in families of patients diagnosed with ICU delirium within 48 h of admission to the ICU."
    explanation: This statement directly reports anxiety symptoms in family members of ICU patients.
- name: Depressive symptoms
  category: Psychiatric
  phenotype_term:
    preferred_term: Depression
    term:
      id: HP:0000716
      label: Depression
  evidence:
  - reference: DOI:10.1055/s-0043-1769933
    supports: SUPPORT
    snippet: "The symptoms of anxiety were present in 44/84 (52.4%), and depression was present in 57/84 (67.9%) family members."
    explanation: This documents depressive symptoms in ICU family members.
- name: Posttraumatic stress symptoms
  category: Psychiatric
  phenotype_term:
    preferred_term: Posttraumatic stress symptom
    term:
      id: HP:0033676
      label: Posttraumatic stress symptom
  evidence:
  - reference: DOI:10.1038/s41598-024-53968-3
    supports: SUPPORT
    snippet: "The prevalence of anxiety symptoms, depression, and posttraumatic stress disorder (PTSD) was higher in families of patients diagnosed with ICU delirium within 48 h of admission to the ICU."
    explanation: This indicates PTSD-related symptoms in family members during ICU admission.
- name: Anger
  category: Psychiatric
  phenotype_term:
    preferred_term: Anger
    term:
      id: HP:0031473
      label: Anger
  evidence:
  - reference: DOI:10.1038/s41598-024-53968-3
    supports: PARTIAL
    snippet: "Taking appropriate actions and thus providing families with appropriate support will contribute to the understanding of unfavorable emotional states, including anxiety, stress, depression, anger, agitation, or avoidance."
    explanation: This statement lists anger among emotional states experienced by ICU family members.
- name: Agitation
  category: Psychiatric
  phenotype_term:
    preferred_term: Agitation
    term:
      id: HP:0000713
      label: Agitation
  evidence:
  - reference: DOI:10.1038/s41598-024-53968-3
    supports: PARTIAL
    snippet: "Taking appropriate actions and thus providing families with appropriate support will contribute to the understanding of unfavorable emotional states, including anxiety, stress, depression, anger, agitation, or avoidance."
    explanation: This statement lists agitation among emotional states experienced by ICU family members.
- name: Avoidance of stimuli associated with traumatic event
  category: Psychiatric
  phenotype_term:
    preferred_term: Avoidance of stimuli associated with traumatic event
    term:
      id: HP:0032942
      label: Avoidance of stimuli associated with traumatic event
  evidence:
  - reference: DOI:10.1038/s41598-024-53968-3
    supports: PARTIAL
    snippet: "Taking appropriate actions and thus providing families with appropriate support will contribute to the understanding of unfavorable emotional states, including anxiety, stress, depression, anger, agitation, or avoidance."
    explanation: This statement explicitly mentions avoidance as an emotional response in ICU family members.
- name: Abnormal fear-induced behavior
  category: Psychiatric
  phenotype_term:
    preferred_term: Abnormal fear-induced behavior
    term:
      id: HP:0100852
      label: Abnormal fear-induced behavior
  evidence:
  - reference: DOI:10.1055/s-0043-1769933
    supports: PARTIAL
    snippet: "The common feelings of all the interviewees were desperation and fear."
    explanation: Family members described fear during the ICU process, consistent with abnormal fear-related behavior.
- name: Sleep disturbance
  category: Psychiatric
  phenotype_term:
    preferred_term: Sleep disturbance
    term:
      id: HP:0002360
      label: Sleep disturbance
  evidence:
  - reference: PMID:40161896
    reference_title: "Development and Validation of a Nomogram Prediction Model for Key Symptoms of Post-Intensive Care Syndrome-Family in Family Members of Critically-Ill Patients: Focusing on Sleep Disturbance, Fatigue, Anxiety, and Depression."
    supports: PARTIAL
    snippet: "The sleep disturbances, fatigue, anxiety, and depression were assessed using the Pittsburgh Sleep Quality Index, the Subscale of Fatigue Assessment Instrument, and the Hospital Anxiety and Depression Scale, respectively."
    explanation: This PICS-F study identifies sleep disturbance as a key symptom domain assessed in ICU family members.
- name: Fatigue
  category: Systemic
  phenotype_term:
    preferred_term: Fatigue
    term:
      id: HP:0012378
      label: Fatigue
  evidence:
  - reference: PMID:40161896
    reference_title: "Development and Validation of a Nomogram Prediction Model for Key Symptoms of Post-Intensive Care Syndrome-Family in Family Members of Critically-Ill Patients: Focusing on Sleep Disturbance, Fatigue, Anxiety, and Depression."
    supports: PARTIAL
    snippet: "The sleep disturbances, fatigue, anxiety, and depression were assessed using the Pittsburgh Sleep Quality Index, the Subscale of Fatigue Assessment Instrument, and the Hospital Anxiety and Depression Scale, respectively."
    explanation: This PICS-F study includes fatigue as a key symptom domain in ICU family members.
- name: Memory impairment
  category: Neurological
  phenotype_term:
    preferred_term: Memory impairment
    term:
      id: HP:0002354
      label: Memory impairment
  evidence:
  - reference: DOI:10.1055/s-0043-1769933
    supports: PARTIAL
    snippet: "All interviewees stated having difficulty understanding and remembering what was told."
    explanation: Family members reported difficulty remembering information during the ICU process, consistent with memory impairment.
- name: Recurrent, involuntary, and intrusive distressing memories
  category: Psychiatric
  phenotype_term:
    preferred_term: Recurrent, involuntary, and intrusive distressing memories
    term:
      id: HP:0032937
      label: Recurrent, involuntary, and intrusive distressing memories
  evidence:
  - reference: PMID:39023049
    reference_title: "Understanding Intensive Care Unit Family Caregivers' Vulnerability to Post-Traumatic Stress Disorder: The Impact of Neurotic Personality Traits, Emotional Suppression, and Perceptions of Unexpected Death."
    supports: PARTIAL
    snippet: "Tendencies to view the patient's death as unexpected may contribute to intrusive thoughts and memories of the ICU experience."
    explanation: This describes intrusive thoughts and memories in ICU family caregivers, matching intrusive distressing memories.
- name: Hopelessness
  category: Psychiatric
  phenotype_term:
    preferred_term: Hopelessness
    term:
      id: HP:5200271
      label: Hopelessness
  evidence:
  - reference: DOI:10.1055/s-0043-1769933
    supports: PARTIAL
    snippet: "The common feelings of all the interviewees were desperation and fear."
    explanation: Desperation aligns with hopelessness reported by ICU family members.
- name: Diminished health-related quality of life
  category: Systemic
  phenotype_term:
    preferred_term: Diminished health-related quality of life
    term:
      id: HP:0033665
      label: Diminished health-related quality of life
  evidence:
  - reference: DOI:10.1186/s13613-025-01420-8
    supports: SUPPORT
    snippet: "Almost one-third of the family members of ICU survivors reported persistent psychological symptoms and QoL problems at 12-months."
    explanation: This supports diminished health-related quality of life in family members after ICU discharge.
- name: Pain
  category: Systemic
  phenotype_term:
    preferred_term: Pain
    term:
      id: HP:0012531
      label: Pain
  evidence:
  - reference: DOI:10.1186/s13613-025-01420-8
    supports: PARTIAL
    snippet: "> 30% reported problems in pain/discomfort or anxiety/depression domains at 12-months."
    explanation: This indicates pain/discomfort problems reported by ICU family members at 12 months.
biochemical: []
genetic: []
environmental:
- name: ICU admission exposure and family stressor
  description: >
    ICU admission and exposure to critical illness in a close family member
    act as a major psychosocial stressor for relatives.
  environment_context:
    preferred_term: intensive care unit
    term:
      id: ENVO:03600008
      label: intensive care unit
  evidence:
  - reference: DOI:10.1038/s41598-024-53968-3
    supports: SUPPORT
    snippet: "During intensive care unit admission, relatives of critically ill patients can experience emotional distress."
    explanation: ICU admission is directly associated with emotional distress in family members, reflecting the environmental stressor context.
  - reference: PMID:29277171
    reference_title: "Post-intensive care syndrome symptoms and health-related quality of life in family decision-makers of critically ill patients."
    supports: SUPPORT
    snippet: "Family members of critically ill patients can suffer symptoms of post-intensive care syndrome-family (PICS-F), including anxiety, depression, and posttraumatic stress disorder (PTSD) with a diminished quality of life."
    explanation: This explicitly links ICU patient critical illness to family psychological symptoms, supporting the ICU exposure stressor context.
  - reference: PMID:35795400
    reference_title: "Postintensive Care Syndrome-Family Associated With COVID-19 Infection."
    supports: SUPPORT
    snippet: "PICS-F refers to the psychologic distress such as anxiety, depression, and posttraumatic stress disorder (PTSD) experienced by the patient's family."
    explanation: This defines family psychological distress tied to ICU patient illness, reinforcing ICU exposure as a key environmental stressor.
treatments:
- name: Family support intervention
  description: >
    Nurse-led, interprofessional family support intervention aimed at improving
    family management, quality of care, and mental health for ICU family members.
  evidence:
  - reference: DOI:10.1186/s13063-024-08351-y
    supports: SUPPORT
    snippet: "The FICUS trial is a cluster-randomized superiority trial to determine the effectiveness of a nurse-led, interprofessional family support intervention (FSI) on the quality of care, family management and individual mental health of family members of critically ill patients, compared to usual care."
    explanation: This describes a structured family support intervention targeting mental health outcomes.
  treatment_term:
    preferred_term: behavioral counseling
    term:
      id: MAXO:0000077
      label: behavioral counseling
datasets: []
clinical_trials:
- name: NCT05280691
  description: >
    Cluster-randomized superiority trial of a multicomponent, nurse-led family
    support intervention in adult intensive care units.
  evidence:
  - reference: clinicaltrials:NCT05280691
    supports: SUPPORT
    snippet: "The primary study endpoint is quality of family care, operationalized as family members' satisfaction with ICU care at discharge."
    explanation: This trial evaluates a family support intervention and targets family outcomes relevant to FICUS.
- name: NCT04316767
  description: >
    Pilot study of a smartphone self-care app delivering cognitive behavioral
    therapy to reduce psychological symptoms in ICU family members.
  evidence:
  - reference: clinicaltrials:NCT04316767
    supports: SUPPORT
    snippet: "This study will examine the effectiveness of a smartphone self-care app delivering cognitive behavioral therapy in decreasing the psychological symptoms suffered by ICU family members."
    explanation: This trial targets psychological symptoms in ICU family members using a CBT-based intervention.
- name: NCT04839406
  description: >
    Randomized controlled trial of a systematic follow-up intervention for
    caregivers of critically ill patients over 12 months.
  evidence:
  - reference: clinicaltrials:NCT04839406
    supports: SUPPORT
    snippet: "The aim of the project is to test the efficacy of a systematic intervention for individual follow-up of caregivers at the intensive care unit during a 12 month randomized controlled trial."
    explanation: This trial evaluates an ICU caregiver follow-up intervention aligned with FICUS care needs.
- name: NCT07228299
  description: >
    Multicenter RCT evaluating chaplain-delivered spiritual care for ICU family
    surrogates using the SCAI framework.
  evidence:
  - reference: clinicaltrials:NCT07228299
    supports: SUPPORT
    snippet: "The overarching goal of our work is to test the effect of high-quality spiritual care for ICU family surrogates on outcomes of psychological and spiritual well-being and medical decision making."
    explanation: This trial targets psychological and spiritual outcomes in ICU family surrogates, relevant to FICUS.

differential_diagnoses:
- name: Post-traumatic stress disorder
  disease_term:
    preferred_term: post-traumatic stress disorder
    term:
      id: MONDO:0005146
      label: post-traumatic stress disorder
  description: >
    Psychiatric disorder characterized by intrusive memories, avoidance,
    negative mood/cognition changes, and hyperarousal after trauma exposure.
  distinguishing_features:
  - PTSD is a formal trauma-related psychiatric diagnosis; FICUS is a syndrome tied to ICU family caregiving context.
  - PTSD may occur without the broader multi-domain family-caregiving context captured in FICUS.
  evidence:
  - reference: PMID:30950647
    reference_title: "Psychological Sequelae in Family Caregivers of Critically III Intensive Care Unit Patients. A Systematic Review."
    supports: SUPPORT
    snippet: "The prevalence of psychological outcomes in family caregivers ranged from 4% to 94% for depression, 2% to 80% for anxiety, and 3% to 62% for PTSD."
    explanation: This review documents PTSD prevalence in ICU family caregivers, supporting consideration of PTSD as a differential.
- name: Major depressive disorder
  disease_term:
    preferred_term: major depressive disorder
    term:
      id: MONDO:0002009
      label: major depressive disorder
  description: >
    Depressive disorder characterized by persistent low mood, anhedonia,
    and functional impairment not necessarily linked to ICU caregiving.
  distinguishing_features:
  - MDD can occur independent of ICU exposure, whereas FICUS is defined by the ICU family context.
  - FICUS often includes multiple symptom domains beyond depression alone.
  evidence:
  - reference: PMID:30950647
    reference_title: "Psychological Sequelae in Family Caregivers of Critically III Intensive Care Unit Patients. A Systematic Review."
    supports: SUPPORT
    snippet: "The prevalence of psychological outcomes in family caregivers ranged from 4% to 94% for depression, 2% to 80% for anxiety, and 3% to 62% for PTSD."
    explanation: The review shows depression is common in ICU family caregivers, motivating differential consideration with MDD.
- name: Generalized anxiety disorder
  disease_term:
    preferred_term: generalized anxiety disorder
    term:
      id: MONDO:0001942
      label: generalized anxiety disorder
  description: >
    Anxiety disorder with excessive, persistent worry across domains,
    distinct from context-specific ICU caregiver stress.
  distinguishing_features:
  - GAD is a chronic anxiety disorder that can predate ICU exposure.
  - FICUS-related anxiety is situational and tied to the ICU caregiving context.
  evidence:
  - reference: PMID:30950647
    reference_title: "Psychological Sequelae in Family Caregivers of Critically III Intensive Care Unit Patients. A Systematic Review."
    supports: SUPPORT
    snippet: "The prevalence of psychological outcomes in family caregivers ranged from 4% to 94% for depression, 2% to 80% for anxiety, and 3% to 62% for PTSD."
    explanation: The review reports anxiety prevalence in ICU family caregivers, supporting GAD as a differential diagnosis.