Motility disorders if oesophagus. Ms ent University exam pattern for 20 marks.
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Motility Disorders of the Oesophagus
MS ENT University Exam Answer (20 Marks)
Introduction (Definition & Classification) [2 marks]
Oesophageal motility disorders are a group of conditions characterised by abnormal neuromuscular function of the oesophagus, resulting in dysphagia, chest pain, or regurgitation in the absence of organic obstruction. They are broadly classified into:
A. Primary Motility Disorders (intrinsic to oesophagus):
- Achalasia (Classical and Vigorous/Type 3)
- Diffuse Esophageal Spasm (DES)
- Nutcracker (Hypertensive Peristalsis) Oesophagus
- Hypertensive Lower Oesophageal Sphincter (LES)
- Ineffective Oesophageal Motility (IEM)
B. Secondary Motility Disorders (due to systemic disease):
- Scleroderma / CREST syndrome
- Diabetes mellitus
- Hypothyroidism
- Amyloidosis
C. Pharyngeal/Upper Oesophageal Disorders (Transit Dysphagia)
- Cricopharyngeal dysfunction
- Zenker's diverticulum
(Source: Cummings Otolaryngology Head and Neck Surgery, Box 68.1; Schwartz's Principles of Surgery, 11th ed.)
1. ACHALASIA [5 marks]
Definition
A primary oesophageal motility disorder of unknown aetiology characterised by insufficient LES relaxation and loss of oesophageal peristalsis.
Pathophysiology
- Degeneration of the myenteric (Auerbach's) plexus - loss of ganglion cells, T-lymphocyte infiltrate, neural fibrosis
- Selective loss of postganglionic inhibitory neurons (nitric oxide and VIP-containing)
- Cholinergic neurons are spared - leading to unopposed cholinergic stimulation
- Results in: elevated basal LES pressure + failure of LES relaxation + aperistalsis
- Loss of latency gradient along the oesophageal body (NO-mediated) causes aperistalsis
Types (Chicago Classification)
| Type | Features |
|---|---|
| Type I (Classic) | Aperistalsis, minimal pressurisation |
| Type II | Aperistalsis + panesophageal pressurisation |
| Type III (Vigorous/Spastic) | Premature (spastic) contractions; was previously called "vigorous achalasia" |
Clinical Features
- Dysphagia - for both solids AND liquids (key distinguishing feature from mechanical obstruction where solids-first pattern is seen)
- Regurgitation - in 75% of patients; undigested material; worse in recumbent position
- Chest pain - in ~40% of patients
- Patients localise dysphagia to cervical or xiphoid area
- Manoeuvres to aid emptying: lifting neck, drinking carbonated beverages
Investigations
-
Barium swallow (best initial test):
- Loss of primary peristalsis in distal two-thirds
- Dilated oesophagus with retained food/saliva
- Smooth "bird's beak" tapering at GEJ
- Advanced disease: massive dilation with sigmoid-like tortuosity
-
Oesophageal manometry (gold standard):
- Aperistalsis - all swallows show simultaneous contractions with low amplitudes
- Absent/incomplete LES relaxation
- Elevated basal LES pressure (may be normal in up to 45%)
- Low LES pressure is NEVER seen in untreated achalasia
-
Upper endoscopy (mandatory to exclude pseudoachalasia from GEJ tumour):
- Dilated, tortuous oesophagus; retained secretions
- LES appears puckered but endoscope can traverse with gentle pressure
- Suspect pseudoachalasia if: older age, short symptom duration, significant weight loss
Treatment
There is no cure; treatment aims to relieve outflow obstruction:
| Modality | Details |
|---|---|
| Pneumatic dilation | Endoscopic; balloon sizes 3, 3.5, 4 cm over guidewire; 50-93% success; 2-5% perforation risk; post-procedure Gastrografin swallow mandatory |
| Heller's myotomy | Surgical laparoscopic; cardiomyotomy + partial fundoplication (Dor); superior to dilation for early disease |
| POEM (Per-oral endoscopic myotomy) | Endoscopic; effective for all types including Type III; longer myotomy recommended |
| Botulinum toxin injection | LES injection; temporary relief; useful in elderly/poor surgical candidates |
| Calcium channel blockers / Nitrates | Oral; modest benefit; used when other treatments contraindicated |
(Source: Cummings Otolaryngology, pp. 1238-1239; Schwartz's Surgery, pp. 1083-1086)
2. DIFFUSE OESOPHAGEAL SPASM (DES) [3 marks]
Definition & Features
- Characterised by substernal chest pain and/or dysphagia
- Primarily a disease of the oesophageal body (unlike achalasia which is primarily a LES disorder)
- Causes lesser degree of dysphagia than achalasia
Manometry
- Repetitive simultaneous contractions of the distal oesophagus
- Some normal peristalsis is maintained (key difference from achalasia where ALL swallows are simultaneous)
- LES relaxation is normal and complete
Radiology
- Barium swallow: classic "corkscrew" oesophagus (due to compartmentalised contractions)
- Can develop epiphrenic or midesophageal diverticulum from compartmentalised high-pressure zones
Treatment
- Medications that relax the oesophagus: nitrates, calcium channel blockers
- Usually not completely effective
- POEM (longer myotomy) for refractory cases
(Source: Cummings Otolaryngology, p. 1241; Schwartz's Surgery, p. 1085)
3. NUTCRACKER (HYPERTENSIVE PERISTALSIS) OESOPHAGUS [2 marks]
- Most common primary oesophageal motility disorder
- Defined by peristaltic contractions with peak amplitudes > 2 SDs above normal (can exceed 400 mmHg)
- Also called: Supersqueeze oesophagus / Hypertensive peristalsis
- Manometry: high-amplitude peristalsis; contraction duration prolonged; LES normal
- At lower end of pressure range: chest pain may actually be related to GERD rather than hypertension - treat GERD first
- At high end (>300 mmHg): chest pain from nutcracker physiology itself
- May represent a marker for increased visceral pain perception rather than a true motility disorder
4. HYPERTENSIVE LES [1 mark]
- Elevated basal LES pressure (≥26 mmHg)
- Normal LES relaxation
- Normal peristalsis in the body
- ~50% have associated motility disorders (hypertensive peristalsis or simultaneous waves)
- Dysphagia due to lack of sphincter compliance
- Tx: Medical (nitrates, CCBs) → botulinum toxin injection (diagnostic/therapeutic) → LES myotomy
5. TRANSIT DYSPHAGIA / CRICOPHARYNGEAL DYSFUNCTION [2 marks]
Pathophysiology
Disorders of the pharyngeal phase of swallowing involving:
- (a) Inadequate oropharyngeal bolus transport
- (b) Inability to pressurize the pharynx
- (c) Inability to elevate the larynx
- (d) Discoordination of pharyngeal contraction and cricopharyngeal relaxation
- (e) Decreased compliance of pharyngoesophageal segment
Causes
- Neurological: CVA, brainstem tumours, Parkinson's disease, MS, pseudobulbar palsy, poliomyelitis
- Muscular: radiation myopathy, dermatomyositis, myotonic dystrophy, myasthenia gravis
- Extrinsic compression: thyromegaly, lymphadenopathy, cervical spine hyperostosis
Diagnosis
- Video/cineradiography (fluoroscopy) is the investigation of choice (manometry is technically difficult for this region)
Zenker's Diverticulum (related condition)
- Pharyngeal pulsion diverticulum at Killian's dehiscence (between thyropharyngeus and cricopharyngeus)
- Results from restricted cricopharyngeal opening
- Symptoms: dysphagia, regurgitation of undigested material, aspiration, weight loss
- Diagnosis: barium swallow (endoscopy risky - risk of perforation)
- Treatment: cricopharyngeal myotomy ± diverticulectomy or diverticulopexy
- Open approach: incision along anterior border of left SCM
- Endoscopic: rigid laryngoscopy + linear cutting stapler (Dohlman procedure)
(Source: Schwartz's Surgery, pp. 1079-1082)
6. SECONDARY MOTILITY DISORDERS [2 marks]
| Condition | Oesophageal Pattern |
|---|---|
| Scleroderma (PSS/CREST) | Most common secondary cause; smooth muscle atrophy and fibrosis → severely reduced/absent peristalsis + severely reduced/absent LES pressure → severe GERD |
| Diabetes mellitus | Hypomotility from autonomic neuropathy |
| Hypothyroidism | Reduced contractility |
| Amyloidosis | Muscle replacement by amyloid |
- Scleroderma: if antireflux surgery needed, only partial fundoplication (Nissen is contraindicated - causes severe dysphagia)
7. INVESTIGATIONS SUMMARY [1 mark]
| Investigation | Key Role |
|---|---|
| Barium swallow | First-line; bird's beak, corkscrew, diverticula |
| Oesophageal manometry (HRM) | Gold standard for motility; Chicago Classification |
| Upper endoscopy | Exclude pseudoachalasia, malignancy |
| Video fluoroscopy | For pharyngeal/upper oesophageal dysphagia |
| 24-hr pH monitoring | Rule out GERD-related dysmotility |
Quick Comparison Table [1 mark]
| Feature | Achalasia | DES | Nutcracker | Hypertensive LES |
|---|---|---|---|---|
| Dysphagia | Solids + liquids | Yes | Sometimes | Yes |
| Chest pain | 40% | Yes | Yes | Sometimes |
| Peristalsis | Absent | Intermittent | Normal, high-amp | Normal |
| LES pressure | High | Normal | Normal | High |
| LES relaxation | Absent | Normal | Normal | Normal |
| Barium | Bird's beak | Corkscrew | Normal | Normal |
| Treatment | Myotomy/POEM/dilation | Nitrates/CCBs | Treat GERD first | Myotomy/botox |
Examiner Tips for 20 Marks
- Always classify disorders at the start (primary vs secondary; upper vs lower)
- For achalasia, state all three components: aperistalsis + high LES pressure + failed LES relaxation
- Emphasise the bird's beak sign on barium and manometry as gold standard
- Chicago Classification Types I/II/III adds high-value points
- Mention pseudoachalasia and endoscopy to exclude GEJ tumour
- POEM is a modern high-value addition for treatment
- For DES: stress that some peristalsis is maintained (contrast with achalasia)
- For secondary disorders: scleroderma is the most important example; warn against Nissen fundoplication
Sources: Cummings Otolaryngology Head and Neck Surgery (6th ed.); Schwartz's Principles of Surgery (11th ed.); Sleisenger & Fordtran's Gastrointestinal and Liver Disease
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