A syndrome characterized by the inability to belch due to failure of the upper esophageal sphincter (cricopharyngeus muscle) to relax in response to retrograde esophageal gaseous distension. The associated symptom complex includes abdominal bloating, chest pain, gurgling noises in the chest, nausea, and excessive flatulence.
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Conditions with similar clinical presentations that must be differentiated from Retrograde Cricopharyngeus Dysfunction:
name: Retrograde Cricopharyngeus Dysfunction
creation_date: '2026-01-10T00:29:46Z'
updated_date: '2026-02-17T21:53:14Z'
description: A syndrome characterized by the inability to belch due to failure
of the upper esophageal sphincter (cricopharyngeus muscle) to relax in
response to retrograde esophageal gaseous distension. The associated symptom
complex includes abdominal bloating, chest pain, gurgling noises in the chest,
nausea, and excessive flatulence.
category: Syndromic
parents:
- Neuromuscular Disorder
- Gastrointestinal Disorder
disease_term:
preferred_term: retrograde cricopharyngeus dysfunction
term:
id: MONDO:0100099
label: retrograde cricopharyngeus dysfunction
phenotypes:
- name: Inability to Belch
description: Complete or near-complete inability to belch (eructate), which is
the cardinal feature of R-CPD. Patients cannot voluntarily or reflexively
release gas from the esophagus through the pharynx.
frequency: Common
phenotype_term:
preferred_term: Abnormality of the digestive system
term:
id: HP:0025031
label: Abnormality of the digestive system
evidence:
- reference: PMID:31236539
reference_title: "Inability to Belch and Associated Symptoms Due to Retrograde Cricopharyngeus Dysfunction: Diagnosis and Treatment."
supports: SUPPORT
snippet: "To propose and test the validity of a new syndrome called retrograde
cricopharyngeus dysfunction (R-CPD) that explains inability to belch and the
associated symptoms of loud gurgling noises, chest and abdominal pain/distention,
and excessive flatulence"
explanation: This landmark paper defined R-CPD and established inability to
belch as the cardinal feature.
- reference: PMID:37621856
reference_title: "Retrograde Cricopharyngeus Dysfunction effectively treated with low dose botulinum toxin. A case report from Italy."
supports: SUPPORT
snippet: "A large constellation of hitherto unexplained symptoms including inability
to burp, gurgling noises from the chest and lower neck, abdominal bloating,
flatulence, painful hiccups and emetophobia was defined as Retrograde Cricopharyngeus
Dysfunction (R-CPD) in 2019."
explanation: The Pavesi 2023 case report reiterates inability to burp as the
defining symptom of R-CPD.
- reference: PMID:38767031
reference_title: "The inability to belch - A neglected disease in the era of high-resolution esophageal manometry."
supports: SUPPORT
snippet: "The incapacity to belch is the hallmark of the disease."
explanation: The Jiménez-Castillo 2025 series states the hallmark symptom is
inability to belch.
- reference: PMID:36054518
reference_title: "Retrograde Cricopharyngeus Dysfunction: The Jefferson Experience."
supports: SUPPORT
snippet: "The inability to burp (98.8%), bloating (92.9%), gurgling noises (31.8%),
and excessive flatulence (21.2%) were the most common symptoms."
explanation: The Jefferson case series quantifies inability to burp as the
dominant presenting symptom.
- reference: PMID:38115814
reference_title: "Retrograde cricopharyngeus dysfunction: How does the inability to burp affect daily life?"
supports: SUPPORT
snippet: "99% reported inability to burp, 98% reported abdominal bloating, 93%
reported socially awkward gurgling noises, 89% reported excessive flatulence."
explanation: Survey data reinforce inability to burp as near-universal among
affected patients.
- name: Abdominal Distention
description: Abdominal bloating and distension due to trapped air that cannot
be expelled through belching.
frequency: Common
phenotype_term:
preferred_term: Abdominal distention
term:
id: HP:0003270
label: Abdominal distention
evidence:
- reference: PMID:35122356
reference_title: "Retrograde upper esophageal sphincter function… and dysfunction."
supports: SUPPORT
snippet: "The associated symptom complex includes some combination of chest pain,
gurgling noises in the chest, bloating, nausea, hiccups, and flatulence."
explanation: Bloating (abdominal distention) is described as part of the
core symptom complex of R-CPD.
- reference: PMID:37621856
reference_title: "Retrograde Cricopharyngeus Dysfunction effectively treated with low dose botulinum toxin. A case report from Italy."
supports: SUPPORT
snippet: "A large constellation of hitherto unexplained symptoms including inability
to burp, gurgling noises from the chest and lower neck, abdominal bloating,
flatulence, painful hiccups and emetophobia was defined as Retrograde Cricopharyngeus
Dysfunction (R-CPD) in 2019."
explanation: The Pavesi 2023 case report lists abdominal bloating as a key
symptom.
- reference: PMID:38115814
reference_title: "Retrograde cricopharyngeus dysfunction: How does the inability to burp affect daily life?"
supports: SUPPORT
snippet: "99% reported inability to burp, 98% reported abdominal bloating, 93%
reported socially awkward gurgling noises, 89% reported excessive flatulence."
explanation: Community survey data show abdominal bloating affects nearly
all respondents with R-CPD.
- name: Chest Pain
description: Chest discomfort or pain, particularly after eating, related to
air entrapment in the esophagus.
frequency: Common
phenotype_term:
preferred_term: Chest pain
term:
id: HP:0100749
label: Chest pain
evidence:
- reference: PMID:35122356
reference_title: "Retrograde upper esophageal sphincter function… and dysfunction."
supports: SUPPORT
snippet: "The associated symptom complex includes some combination of chest pain,
gurgling noises in the chest, bloating, nausea, hiccups, and flatulence."
explanation: Chest pain is identified as a core symptom of retrograde UES
dysfunction.
- name: Nausea
description: Nausea, often occurring after meals due to air entrapment and
inability to release gastric gas.
frequency: Variable
phenotype_term:
preferred_term: Nausea
term:
id: HP:0002018
label: Nausea
evidence:
- reference: PMID:35122356
reference_title: "Retrograde upper esophageal sphincter function… and dysfunction."
supports: SUPPORT
snippet: "The associated symptom complex includes some combination of chest pain,
gurgling noises in the chest, bloating, nausea, hiccups, and flatulence."
explanation: Nausea is described as part of the symptom complex associated
with R-CPD.
- name: Gurgling Sounds
description: Socially awkward gurgling noises from the chest and lower neck as
the esophagus churns attempting to expel trapped air.
frequency: Common
phenotype_term:
preferred_term: Abnormality of the digestive system
term:
id: HP:0025031
label: Abnormality of the digestive system
evidence:
- reference: PMID:31236539
reference_title: "Inability to Belch and Associated Symptoms Due to Retrograde Cricopharyngeus Dysfunction: Diagnosis and Treatment."
supports: SUPPORT
snippet: "To propose and test the validity of a new syndrome called retrograde
cricopharyngeus dysfunction (R-CPD) that explains inability to belch and the
associated symptoms of loud gurgling noises, chest and abdominal pain/distention,
and excessive flatulence"
explanation: Loud gurgling noises are described as a core feature of R-CPD.
- reference: PMID:37621856
reference_title: "Retrograde Cricopharyngeus Dysfunction effectively treated with low dose botulinum toxin. A case report from Italy."
supports: SUPPORT
snippet: "A large constellation of hitherto unexplained symptoms including inability
to burp, gurgling noises from the chest and lower neck, abdominal bloating,
flatulence, painful hiccups and emetophobia was defined as Retrograde Cricopharyngeus
Dysfunction (R-CPD) in 2019."
explanation: Gurgling noises from the chest and lower neck are highlighted
among the presenting symptoms.
- reference: PMID:38115814
reference_title: "Retrograde cricopharyngeus dysfunction: How does the inability to burp affect daily life?"
supports: SUPPORT
snippet: "99% reported inability to burp, 98% reported abdominal bloating, 93%
reported socially awkward gurgling noises, 89% reported excessive flatulence."
explanation: Survey responses show gurgling noises are frequent in R-CPD.
pathophysiology:
- name: Failure of Upper Esophageal Sphincter Relaxation
description: The cricopharyngeus muscle, which constitutes the upper
esophageal sphincter, fails to relax in response to retrograde esophageal
gaseous distension that normally triggers belching. This is a
reflex-specific deficit, as deglutitive (swallowing-related) UES relaxation
remains intact.
cell_types:
- preferred_term: muscle cell
modifier: ABNORMAL
term:
id: CL:0000187
label: muscle cell
- preferred_term: sensory neuron
modifier: ABNORMAL
term:
id: CL:0000101
label: sensory neuron
biological_processes:
- preferred_term: regulation of muscle contraction
modifier: ABNORMAL
term:
id: GO:0006937
label: regulation of muscle contraction
- preferred_term: skeletal muscle contraction
modifier: ABNORMAL
term:
id: GO:0003009
label: skeletal muscle contraction
locations:
- preferred_term: upper esophageal sphincter
term:
id: UBERON:0007268
label: upper esophageal sphincter
- preferred_term: cricopharyngeus muscle
term:
id: UBERON:0010928
label: cricopharyngeus muscle
evidence:
- reference: PMID:35122356
reference_title: "Retrograde upper esophageal sphincter function… and dysfunction."
supports: SUPPORT
snippet: "prior to 2019, there were only three case reports in the world literature
of individuals with a physiologically demonstrated inability to belch due to
failure of the UES to relax after gas venting from the stomach and ensuing low-pressure
esophageal distention"
explanation: The Kahrilas 2022 review establishes that UES relaxation
failure during retrograde gas events is the core pathophysiological
mechanism.
- reference: PMID:38587015
reference_title: "Upper Esophageal Sphincter and Esophageal Motility Pathology on Manometry in Retrograde Cricopharyngeal Dysfunction."
supports: SUPPORT
snippet: "RCPD is associated with a longer UES, elevated UES basal pressures,
and an increased incidence of ineffective esophageal motility."
explanation: The Yousef 2024 case-control study demonstrated physiological
abnormalities in UES function in R-CPD patients.
- reference: PMID:41506952
reference_title: "Retrograde cricopharyngeal dysfunction: Two case reports and a literature review."
supports: SUPPORT
snippet: "high-resolution manometry was performed on both patients, showing elevated
basal upper esophageal sphincter (UES) pressure and absence of UES relaxation
with attempted belching."
explanation: The Dealino 2026 cases document absent UES relaxation during
attempted belching.
- reference: PMID:38767031
reference_title: "The inability to belch - A neglected disease in the era of high-resolution esophageal manometry."
supports: SUPPORT
snippet: "We performed HRM with a belch provocation test for which the patient
drank 500 ml of carbonated water. The study revealed increased esophageal pressure,
an absence of UES relaxation and secondary peristalsis once the patient mentioned
the need to belch."
explanation: The Jiménez-Castillo 2025 case series shows failure of UES
relaxation during retrograde distension.
- name: Elevated Upper Esophageal Sphincter Basal Pressure
description: Patients with R-CPD have significantly higher resting UES
pressure compared to healthy controls, contributing to the inability to
release trapped gas.
cell_types:
- preferred_term: muscle cell
modifier: ABNORMAL
term:
id: CL:0000187
label: muscle cell
biological_processes:
- preferred_term: muscle contraction
modifier: INCREASED
term:
id: GO:0006936
label: muscle contraction
locations:
- preferred_term: upper esophageal sphincter
term:
id: UBERON:0007268
label: upper esophageal sphincter
evidence:
- reference: PMID:38587015
reference_title: "Upper Esophageal Sphincter and Esophageal Motility Pathology on Manometry in Retrograde Cricopharyngeal Dysfunction."
supports: SUPPORT
snippet: "The RCPD cohort, compared to the asymptomatic cohort, exhibited significantly
greater upper esophageal sphincter (UES) length [4.5 (SD: 0.7) vs 3.7 (0.9)
cm"
explanation: The case-control study quantified higher UES basal pressures in
R-CPD patients relative to controls.
- reference: PMID:41506952
reference_title: "Retrograde cricopharyngeal dysfunction: Two case reports and a literature review."
supports: SUPPORT
snippet: "high-resolution manometry was performed on both patients, showing elevated
basal upper esophageal sphincter (UES) pressure and absence of UES relaxation
with attempted belching."
explanation: Elevated resting UES pressure was observed in both cases in the
2026 report.
treatments:
- name: Botulinum Toxin Injection
description: Injection of botulinum toxin type A into the cricopharyngeus
muscle to induce temporary relaxation. This is both diagnostic and
therapeutic, with high success rates in restoring the ability to belch.
treatment_term:
preferred_term: botulinum toxin type A therapy
term:
id: MAXO:0009016
label: botulinum toxin type A therapy
evidence:
- reference: PMID:31236539
reference_title: "Inability to Belch and Associated Symptoms Due to Retrograde Cricopharyngeus Dysfunction: Diagnosis and Treatment."
supports: SUPPORT
snippet: "All 51 patients achieved ability to belch and relief of associated symptoms,
and the majority seem to have \"retrained\" the ability to belch on a potentially
\"permanent\" basis."
explanation: The Bastian 2019 case series demonstrated 100% success rate
with botulinum toxin injection in restoring belching ability.
- reference: PMID:38587015
reference_title: "Upper Esophageal Sphincter and Esophageal Motility Pathology on Manometry in Retrograde Cricopharyngeal Dysfunction."
supports: SUPPORT
snippet: "All patients who underwent cricopharyngeal botulinum injections experienced
initial improvement of symptoms with 3 patients requiring repeat intervention."
explanation: The Yousef 2024 study confirms botulinum toxin as an effective
treatment.
- reference: PMID:37621856
reference_title: "Retrograde Cricopharyngeus Dysfunction effectively treated with low dose botulinum toxin. A case report from Italy."
supports: SUPPORT
snippet: "successfully treated with unilateral, anesthesia-free injection of 10
units of onabotulinum toxin into the cricopharyngeus muscle, representing the
lowest dose reported to date."
explanation: The Pavesi 2023 case report demonstrates symptom resolution
with low-dose botulinum toxin.
- reference: PMID:41200864
reference_title: "How I Do It: The Transtracheal Approach for Awake Cricopharyngeal Botulinum Toxin Injection."
supports: SUPPORT
snippet: "This transtracheal technique for cricopharyngeal botulinum toxin injection
is a safe and effective option for chemodenervation of this muscle in the awake
patient."
explanation: The Tritter 2025 procedural report supports safety and
effectiveness of the transtracheal botulinum approach.
- reference: PMID:41506952
reference_title: "Retrograde cricopharyngeal dysfunction: Two case reports and a literature review."
supports: SUPPORT
snippet: "previously undergone percutaneous botulinum toxin injection that initially
provided temporary relief."
explanation: The Dealino 2026 case notes symptomatic improvement after
botulinum toxin injection.
- reference: PMID:40411338
reference_title: "Etiology, Clinical Presentation, and Management of Retrograde Cricopharyngeus Dysfunction: A Systematic Review."
supports: SUPPORT
snippet: "The immediate success rate of botulinum toxin injection into the cricopharyngeal
sphincter in facilitating burping was 92.5%."
explanation: Systematic review reports high immediate success for botulinum
toxin in R-CPD.
- reference: PMID:39883449
reference_title: "Origin and In-Office Treatment of Retrograde Cricopharyngeus Dysfunction."
supports: SUPPORT
snippet: "The cumulative success rate of BTI was 90.6% (96 of 106 patients)."
explanation: In-office botulinum injections achieved high cumulative success
in a 106-patient series.
- reference: PMID:38576368
reference_title: "Retrograde Cricopharyngeus Dysfunction, a New Motility Disorder: Single Center Case Series and Treatment Results."
supports: SUPPORT
snippet: "At median follow-up of 29 months (range, 3-50) post-treatment, 51.3%
(n = 20/39) of patients reported persistent complete relief of symptoms"
explanation: Belgian case series quantifies short- and long-term response
rates to botulinum toxin.
diagnosis:
- name: High-Resolution Impedance Manometry
description: HRIM with provocative carbonated water challenge can objectively
demonstrate failure of UES relaxation during gaseous distension, confirming
the diagnosis.
evidence:
- reference: PMID:35122356
reference_title: "Retrograde upper esophageal sphincter function… and dysfunction."
supports: SUPPORT
snippet: "The field has now further advanced with the publication in this issue
of the Journal by Oude Nijhuis et al. of 8 cases of R-UESD demonstrated by high-resolution
impedance manometry (HRIM) with a provocative challenge of carbonated water."
explanation: HRIM with provocative testing provides objective diagnostic
confirmation of R-CPD.
- reference: PMID:38587015
reference_title: "Upper Esophageal Sphincter and Esophageal Motility Pathology on Manometry in Retrograde Cricopharyngeal Dysfunction."
supports: SUPPORT
snippet: "Esophageal high-resolution impedance manometry was completed preoperatively
in patients diagnosed with RCPD."
explanation: HRIM is used for demonstrating UES abnormalities in R-CPD.
- reference: PMID:38767031
reference_title: "The inability to belch - A neglected disease in the era of high-resolution esophageal manometry."
supports: SUPPORT
snippet: "We performed HRM with a belch provocation test for which the patient
drank 500 ml of carbonated water. The study revealed increased esophageal pressure,
an absence of UES relaxation and secondary peristalsis once the patient mentioned
the need to belch."
explanation: HRM with belch provocation shows characteristic pressure rise
and absent UES relaxation in R-CPD.
differential_diagnoses:
- name: Supragastric Belching
description: Functional belching disorder characterized by repetitive
supradiaphragmatic air influx and frequent belches, rather than an inability
to vent esophageal gas.
distinguishing_features:
- Patients exhibit frequent, often repetitive belching episodes instead of
inability to belch.
- High-resolution manometry shows normal UES relaxation during belches,
without trapped gas-related pressure build-up.
evidence:
- reference: PMID:38767031
reference_title: "The inability to belch - A neglected disease in the era of high-resolution esophageal manometry."
supports: SUPPORT
snippet: "The incapacity to belch is the hallmark of the disease."
explanation: R-CPD is defined by inability to belch, distinguishing it from
conditions like supragastric belching where belching is frequent.
notes: >
R-CPD was first formally described as a clinical entity in 2019 by Bastian and Smithson.
Prior to this, only three case reports existed in the literature of individuals
with
physiologically demonstrated inability to belch. The condition is now recognized
as
more common than previously thought. Many patients retain the ability to belch after
botulinum toxin treatment beyond the expected pharmacologic duration, suggesting
reflex reprogramming or central adaptation may occur.
references:
- reference: DOI:10.1002/jpn3.12193
title: Pediatric retrograde cricopharyngeal dysfunction diagnosed by
high‐resolution impedance manometry
findings: []
- reference: DOI:10.1002/ohn.735
title: Upper Esophageal Sphincter and Esophageal Motility Pathology on
Manometry in Retrograde Cricopharyngeal Dysfunction
findings: []
- reference: DOI:10.1002/oto2.70014
title: 'Diagnosis and Management of Retrograde Cricopharyngeal Dysfunction: A Systematic
Review'
findings: []
- reference: DOI:10.1007/s00405-024-08644-7
title: 'Cricopharyngeus muscle dysfunction: a poorly defined disorder from diagnosis
to treatment'
findings: []
- reference: DOI:10.1111/nmo.14328
title: Retrograde upper esophageal sphincter function… and dysfunction
findings: []
- reference: DOI:10.1152/ajpgi.00007.2012
title: The role of the superior laryngeal nerve in esophageal reflexes
findings: []
- reference: DOI:10.1152/ajpgi.00292.2018
title: Effects of esophageal acidification on esophageal reflexes controlling
the upper esophageal sphincter
findings: []
- reference: DOI:10.1177/19160216251329012
title: 'Etiology, Clinical Presentation, and Management of Retrograde Cricopharyngeus
Dysfunction: A Systematic Review'
findings: []
- reference: DOI:10.1177/2473974x19834553
title: 'Inability to Belch and Associated Symptoms Due to Retrograde Cricopharyngeus
Dysfunction: Diagnosis and Treatment'
findings: []
- reference: DOI:10.1177/2473974x20938342
title: The Long‐term Efficacy of Botulinum Toxin Injection to Treat Retrograde
Cricopharyngeus Dysfunction
findings: []
- reference: DOI:10.3389/fneur.2022.1005655
title: 'Case report: A case of novel treatment for retrograde cricopharyngeal dysfunction'
findings: []
Retrograde Cricopharyngeus Dysfunction is characterized by a failure of the upper esophageal sphincter (UES), largely constituted by the cricopharyngeus muscle, to relax in response to retrograde esophageal gaseous distension that normally triggers belching. High-resolution impedance manometry (HRIM) studies with provocative carbonated-water challenges demonstrate common-cavity pressurization from gastric gas reflux without the expected, complete UES relaxation and air venting, resulting in air trapping within the esophagus. Clinically this manifests as inability to belch with associated chest/neck gurgling, bloating, chest discomfort, and excessive flatulence (i.e., the “no-burp” syndrome). Botulinum toxin injection targeting the cricopharyngeus (CP) reproducibly restores belching and relieves symptoms, often with durability that outlasts the pharmacologic window, supporting a neuromuscular reflex-control failure rather than structural obstruction as the core mechanism (kahrilas2022retrogradeupperesophageal pages 1-3, kahrilas2022retrogradeupperesophageal pages 4-6, yousef2024upperesophagealsphincter pages 8-12, xie2022casereporta pages 1-2, krekeler2024cricopharyngeusmuscledysfunction pages 4-6).
Mechanistically, the normal belch sequence involves a transient lower esophageal sphincter relaxation with gas reflux and esophageal pressurization, followed by UES/CP relaxation and esophago-pharyngeal gas venting; HRIM and physiologic experiments indicate the UES relaxation is volume- and pressure-dependent and mediated by vagal and superior laryngeal nerve (SLN) pathways. In R-CPD, this retrograde UES relaxation fails despite preserved deglutitive UES relaxation, i.e., a reflex-specific deficit. This failure diverts gas clearance to secondary peristalsis, producing repeated audible gurgling and symptomatic air trapping (kahrilas2022retrogradeupperesophageal pages 3-4, kahrilas2022retrogradeupperesophageal pages 1-3, xie2022casereporta pages 1-2).
| Study (first author, year) | Design / Population | Key Physiologic Findings (UES/CP behavior; HRIM metrics) | Neural Reflex Insights | Treatment Outcomes (botulinum toxin / myotomy) | URL (with DOI) | Publication date (month/year) |
|---|---|---|---|---|---|---|
| Kahrilas 2022 | Minireview / case-series synthesis | Failure of UES relaxation to retrograde gas; HRIM with carbonated-water provocation demonstrates absent UES relaxation despite common-cavity events | Belch reflex: tLESR → esophageal pressurization → UES relaxation; reflex is pressure- and volume-dependent; complex vagal/SLN mediation (belch vs swallow differences) (kahrilas2022retrogradeupperesophageal pages 1-3) | BTX to CPM restores belching in reported series; supports reflex failure rather than fixed obstruction (kahrilas2022retrogradeupperesophageal pages 1-3) | https://doi.org/10.1111/nmo.14328 | Feb 2022 |
| Yousef 2024 | Case-control HRIM study (R-CPD n=13 vs controls n=26) | R-CPD: longer UES length and markedly higher UES basal pressures (mean ~92 mmHg vs ~50 mmHg); ↑ ineffective swallows and incomplete bolus clearance on HRIM (yousef2024upperesophagealsphincter pages 8-12) | Supports impaired retrograde UES relaxation with concomitant esophageal motility abnormalities; suggests phenotypic heterogeneity (yousef2024upperesophagealsphincter pages 8-12) | All treated with CP botulinum had initial improvement; some required repeat injections (yousef2024upperesophagealsphincter pages 8-12) | https://doi.org/10.1002/ohn.735 | Apr 2024 |
| Dorfman 2024 (pediatric HRIM) | Pediatric case series (adolescents with inability to burp) | Normal deglutitive UES relaxation but abnormal UES relaxation to carbonated-drink provocation with high impedance indicating air entrapment; several had esophageal motility disorders (xie2022casereporta pages 1-2, yousef2024upperesophagealsphincter pages 8-12) | Provocation HRIM shows selective failure of retrograde-triggered UES relaxation; supports reflex-specific dysfunction rather than global swallow failure (xie2022casereporta pages 1-2) | Symptom improvement/resolution after BTX into CPM reported in cohort (xie2022casereporta pages 1-2) | https://doi.org/10.1002/jpn3.12193 | Mar 2024 |
| Bastian 2019 | Consecutive case series (n=51) | Syndromic diagnostic criteria for R-CPD (inability to belch, gurgling, bloating); BTX injection into CPM produced restoration of burping in all patients; many retained function beyond expected pharmacologic window (kahrilas2022retrogradeupperesophageal pages 4-6) | Clinical validation that targeted chemodenervation of CPM unmasks/refutes diagnosis; implies neuromuscular/reflex control locus at CPM (kahrilas2022retrogradeupperesophageal pages 4-6) | 100% short-term success with BTX; many maintained long-term retrained belching; few required myotomy (kahrilas2022retrogradeupperesophageal pages 4-6) | https://doi.org/10.1177/2473974x19834553 | Mar 2019 |
| Hoesli 2020 | Large retrospective case series (first 200 patients treated) | 99.5% gained ability to burp after BTX; 79.9% maintained satisfactory burping >6 months after single injection; supports durable functional recovery in many (yousef2024upperesophagealsphincter pages 8-12, krekeler2024cricopharyngeusmuscledysfunction pages 4-6) | Outcome data implies functional reprogramming of reflex circuits or central adaptation after temporary CPM denervation (yousef2024upperesophagealsphincter pages 8-12) | BTX injection safe; minority required repeat injections or partial myotomy (yousef2024upperesophagealsphincter pages 8-12) | https://doi.org/10.1177/2473974x20938342 | Apr 2020 |
| Xie 2022 | Single case report with HRM and guided BTX injection | HRM: elevated UES residual pressure (22.6 mmHg; normal <12); imaging showed air trapping; post-BTX residual pressure normalized (5.5 mmHg) with symptom resolution (xie2022casereporta pages 1-2) | Objective demonstration of selective failure of retrograde UES relaxation with normalization after targeted CPM chemodenervation (xie2022casereporta pages 1-2) | Rapid, complete symptom resolution after BTX (50 U) with sustained effect at follow-up; supports diagnostic/therapeutic role of BTX (xie2022casereporta pages 1-2) | https://doi.org/10.3389/fneur.2022.1005655 | Dec 2022 |
| Krekeler 2024 (review) | Narrative review of CPM dysfunction | Summarizes HRIM findings: abnormal retrograde UES relaxation, air entrapment on impedance, possible HRPM-I thresholds (e.g., abnormal relaxation pressure >8 mmHg) (krekeler2024cricopharyngeusmuscledysfunction pages 4-6) | Highlights knowledge gaps in reflex circuitry but emphasizes vagal/SLN afferent roles and need for standardized diagnostic criteria (krekeler2024cricopharyngeusmuscledysfunction pages 4-6) | Reviews evidence for BTX as first-line; myotomy for refractory cases; calls for prospective trials (krekeler2024cricopharyngeusmuscledysfunction pages 4-6) | https://doi.org/10.1007/s00405-024-08644-7 | May 2024 |
| Lang 2012 | Animal (decerebrate cat) experiments on SLN role | Rapid esophageal distension triggers belch sequence with UES (CP) inhibition; distinct receptors (mucosal rapidly adapting vs muscular slowly adapting) evoke different UES responses (lang2012theroleof pages 11-12, lang2012theroleof pages 1-1) | SLN afferents mediate CP inhibition component of belch; vagal afferents required for belch initiation; SLN transection abolishes CP inhibition while vagotomy abolishes belch (lang2012theroleof pages 11-12) | Mechanistic/physiologic foundation explaining why CPM denervation (BTX) can restore venting by removing hyperactive CP tone (lang2012theroleof pages 11-12) | https://doi.org/10.1152/ajpgi.00007.2012 | Jun 2012 |
| Lang 2019 | Animal studies on esophageal acidification effects | Short-term acid sensitizes EURR (esophago-UES relaxation reflex) and desensitizes EUCR; longer exposure inhibits EURR and EUCR—showing plasticity of reflexes (lang2019effectsofesophageal pages 18-23) | Demonstrates that peripheral sensitization/desensitization (e.g., acid exposure) alters reflex thresholds controlling UES relaxation/contraction (lang2019effectsofesophageal pages 18-23) | Implies reflux or mucosal afferent modulation could influence R-CPD phenotype or severity; therapeutic implications for modulating afferent input (lang2019effectsofesophageal pages 18-23) | https://doi.org/10.1152/ajpgi.00292.2018 | Jan 2019 |
| Szczesniak 2008 | Review of esophageal afferent pathways | Describes vagal mechanoreceptors (IGLEs) and mucosal receptors mediating esophago-pharyngeal reflexes; evidence that mucosal anesthesia abolishes certain UES relaxations—underscoring sensory afferent dependence (szczesniak2008…andpathophysiological pages 58-61, szczesniak2008…andpathophysiological pages 88-94) | Highlights central afferent processing and pharmacologic modulation (e.g., GABAB effects on afferent traffic) that can block distension-induced UES responses (szczesniak2008…andpathophysiological pages 58-61, szczesniak2008…andpathophysiological pages 88-94) | Provides rationale for therapies targeting sensory modulation or central processing in addition to CPM-focused interventions (szczesniak2008…andpathophysiological pages 58-61) | (review; DOI varies) | 2008 |
Table: Evidence matrix summarizing key recent studies on Retrograde Cricopharyngeus Dysfunction (R-CPD), their physiologic findings, neural reflex insights, and treatment outcomes; useful for quickly locating mechanistic and clinical citations.
1) Primary mechanisms - Reflex-specific failure of UES/cricopharyngeus relaxation in response to abrupt proximal esophageal gaseous distension (belch trigger), despite normal deglutitive UES relaxation. This causes air trapping, common-cavity pressurization without pharyngeal venting, and compensatory secondary peristalsis with gurgling (Neurogastroenterology & Motility 2022; Otolaryngology–HNS 2024; J Pediatr Gastroenterol Nutr 2024) (kahrilas2022retrogradeupperesophageal pages 1-3, yousef2024upperesophagealsphincter pages 8-12, xie2022casereporta pages 1-2, kahrilas2022retrogradeupperesophageal pages 3-4). - Elevated basal UES tone/length and frequent ineffective esophageal motility occur in a subset, potentially amplifying air entrapment and symptom severity (Otolaryngology–HNS 2024) (yousef2024upperesophagealsphincter pages 8-12). - Robust clinical and HRIM improvement after targeted CP chemodenervation with botulinum toxin implicates hypertonic CP muscle and/or aberrant reflex control as the operative defects (OTO Open 2019, 2020; Frontiers Neurol 2022) (kahrilas2022retrogradeupperesophageal pages 4-6, yousef2024upperesophagealsphincter pages 8-12, xie2022casereporta pages 1-2).
2) Dysregulated pathways - Esophago‑UES relaxation reflex (EURR) is blunted/absent in R-CPD, while esophago‑UES contraction reflex (EUCR) and secondary peristalsis compensate; animal studies demonstrate differential activation by rapid (mucosal) vs slow (muscularis) distension, and that SLN afferents mediate CP inhibition during belch whereas vagal afferents are essential for belch initiation (AJP-GI 2012; AJP-GI 2019) (lang2012theroleof pages 1-1, lang2012theroleof pages 6-7, lang2019effectsofesophageal pages 18-23, lang2012theroleof pages 11-12). - Sensory modulation: esophageal acidification sensitizes EURR short-term but desensitizes both EURR and EUCR with prolonged exposure, highlighting plasticity that may modulate R-CPD phenotype (AJP-GI 2019) (lang2019effectsofesophageal pages 18-23). - Central/afferent modulation: GABA-B agonism reduces vagal afferent traffic and can block distension-induced UES responses, indicating GABAergic control over afferent gating (Szczesniak 2008) (szczesniak2008…andpathophysiological pages 88-94).
3) Affected cellular processes - Impaired neuromuscular inhibition of skeletal muscle (CP) during retrograde gas events; altered sensorimotor integration of vagal/SLN afferents with medullary nuclei coordinating UES relaxation and laryngeal closure; secondary peristalsis recruitment for gas clearance (kahrilas2022retrogradeupperesophageal pages 3-4, lang2012theroleof pages 11-12, lang2019effectsofesophageal pages 18-23).
R-CPD is a reflex-specific neuromuscular disorder of the UES in which failure of cricopharyngeus relaxation during retrograde gaseous distension leads to air entrapment and cardinal symptoms. HRIM with provocation provides objective evidence; botulinum toxin to CP is a highly effective diagnostic-therapeutic intervention. Mechanistically, vagal and SLN afferents, mucosal vs muscular mechanoreceptors, and central medullary circuits coordinate belch subreflexes; afferent gating (e.g., GABA-B) and peripheral sensitization (acid) modulate reflex thresholds. Coexisting esophageal motility abnormalities and elevated UES basal pressure/length may influence phenotype and treatment durability (kahrilas2022retrogradeupperesophageal pages 1-3, yousef2024upperesophagealsphincter pages 8-12, kahrilas2022retrogradeupperesophageal pages 4-6, xie2022casereporta pages 1-2, krekeler2024cricopharyngeusmuscledysfunction pages 4-6, lechien2025etiologyclinicalpresentation pages 1-3, lang2012theroleof pages 6-7, lang2019effectsofesophageal pages 18-23).
References
(kahrilas2022retrogradeupperesophageal pages 1-3): Peter J. Kahrilas. Retrograde upper esophageal sphincter function… and dysfunction. Neurogastroenterology & Motility, Feb 2022. URL: https://doi.org/10.1111/nmo.14328, doi:10.1111/nmo.14328. This article has 31 citations and is from a peer-reviewed journal.
(kahrilas2022retrogradeupperesophageal pages 4-6): Peter J. Kahrilas. Retrograde upper esophageal sphincter function… and dysfunction. Neurogastroenterology & Motility, Feb 2022. URL: https://doi.org/10.1111/nmo.14328, doi:10.1111/nmo.14328. This article has 31 citations and is from a peer-reviewed journal.
(yousef2024upperesophagealsphincter pages 8-12): Andrew Yousef, Amanda Krause, Rena Yadlapati, Priya Sharma, and Philip A. Weissbrod. Upper esophageal sphincter and esophageal motility pathology on manometry in retrograde cricopharyngeal dysfunction. Otolaryngology–head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 171:478-485, Apr 2024. URL: https://doi.org/10.1002/ohn.735, doi:10.1002/ohn.735. This article has 15 citations.
(xie2022casereporta pages 1-2): Mengshu Xie, Hongmei Wen, and Zulin Dou. Case report: a case of novel treatment for retrograde cricopharyngeal dysfunction. Frontiers in Neurology, Dec 2022. URL: https://doi.org/10.3389/fneur.2022.1005655, doi:10.3389/fneur.2022.1005655. This article has 12 citations and is from a peer-reviewed journal.
(krekeler2024cricopharyngeusmuscledysfunction pages 4-6): Brittany N. Krekeler and Rebecca J. Howell. Cricopharyngeus muscle dysfunction: a poorly defined disorder from diagnosis to treatment. European Archives of Oto-Rhino-Laryngology, 281:4519-4527, May 2024. URL: https://doi.org/10.1007/s00405-024-08644-7, doi:10.1007/s00405-024-08644-7. This article has 3 citations and is from a peer-reviewed journal.
(kahrilas2022retrogradeupperesophageal pages 3-4): Peter J. Kahrilas. Retrograde upper esophageal sphincter function… and dysfunction. Neurogastroenterology & Motility, Feb 2022. URL: https://doi.org/10.1111/nmo.14328, doi:10.1111/nmo.14328. This article has 31 citations and is from a peer-reviewed journal.
(lechien2025etiologyclinicalpresentation pages 1-3): Jérôme R. Lechien, Marie Mailly, Stephane Hans, and Lee M. Akst. Etiology, clinical presentation, and management of retrograde cricopharyngeus dysfunction: a systematic review. Journal of Otolaryngology - Head & Neck Surgery, May 2025. URL: https://doi.org/10.1177/19160216251329012, doi:10.1177/19160216251329012. This article has 6 citations.
(lang2012theroleof pages 11-12): I. M. Lang, B. K. Medda, S. Jadcherla, and R. Shaker. The role of the superior laryngeal nerve in esophageal reflexes. American journal of physiology. Gastrointestinal and liver physiology, 302 12:G1445-57, Jun 2012. URL: https://doi.org/10.1152/ajpgi.00007.2012, doi:10.1152/ajpgi.00007.2012. This article has 41 citations.
(lang2012theroleof pages 1-1): I. M. Lang, B. K. Medda, S. Jadcherla, and R. Shaker. The role of the superior laryngeal nerve in esophageal reflexes. American journal of physiology. Gastrointestinal and liver physiology, 302 12:G1445-57, Jun 2012. URL: https://doi.org/10.1152/ajpgi.00007.2012, doi:10.1152/ajpgi.00007.2012. This article has 41 citations.
(lang2019effectsofesophageal pages 18-23): Ivan M. Lang, Bidyut K. Medda, and Reza Shaker. Effects of esophageal acidification on esophageal reflexes controlling the upper esophageal sphincter. American journal of physiology. Gastrointestinal and liver physiology, 316 1:G45-G54, Jan 2019. URL: https://doi.org/10.1152/ajpgi.00292.2018, doi:10.1152/ajpgi.00292.2018. This article has 19 citations.
(szczesniak2008…andpathophysiological pages 58-61): MM Szczesniak. … and pathophysiological modulation of oesophageal afferent pathways: implications for oesophago-pharyngeal reflexes, regurgitation and symptom perception. Unknown journal, 2008.
(szczesniak2008…andpathophysiological pages 88-94): MM Szczesniak. … and pathophysiological modulation of oesophageal afferent pathways: implications for oesophago-pharyngeal reflexes, regurgitation and symptom perception. Unknown journal, 2008.
(lang2012theroleof pages 6-7): I. M. Lang, B. K. Medda, S. Jadcherla, and R. Shaker. The role of the superior laryngeal nerve in esophageal reflexes. American journal of physiology. Gastrointestinal and liver physiology, 302 12:G1445-57, Jun 2012. URL: https://doi.org/10.1152/ajpgi.00007.2012, doi:10.1152/ajpgi.00007.2012. This article has 41 citations.
(lang2012theroleof pages 9-10): I. M. Lang, B. K. Medda, S. Jadcherla, and R. Shaker. The role of the superior laryngeal nerve in esophageal reflexes. American journal of physiology. Gastrointestinal and liver physiology, 302 12:G1445-57, Jun 2012. URL: https://doi.org/10.1152/ajpgi.00007.2012, doi:10.1152/ajpgi.00007.2012. This article has 41 citations.