How can achalasia be distinguished from a peptic stricture of the distal esophagus, and what are the appropriate diagnostic and treatment approaches for each condition?

Distinguishing Achalasia from Peptic Stricture

The key distinction is that achalasia requires high-resolution manometry (HRM) for definitive diagnosis showing impaired lower esophageal sphincter (LES) relaxation with absent peristalsis, while peptic stricture is diagnosed endoscopically with visible narrowing from chronic acid reflux—and critically, these conditions require completely different treatment approaches (30-40mm pneumatic dilation for achalasia vs. 13-15mm dilation plus PPI therapy for peptic stricture). 1, 2

Diagnostic Approach

Initial Evaluation

Endoscopy (EGD) is the first-line test to exclude mechanical obstruction and obtain tissue diagnosis. Look for:

• Achalasia findings: Retained saliva/food debris, puckering at the gastroesophageal junction, dilated esophagus with resistance at the GEJ, but no visible stricture 3
• Peptic stricture findings: Visible circumferential narrowing in distal esophagus, often with surrounding inflammation or Barrett's changes 1

Critical pitfall: Achalasia can mimic peptic stricture on endoscopy, and performing an antireflux procedure when achalasia is present leads to treatment failure and need for extensive revision surgery 4

Definitive Diagnostic Tests

High-resolution manometry is mandatory when dysphagia persists without clear mechanical obstruction 2, 5. This is the gold standard for achalasia diagnosis showing:

• Elevated integrated relaxation pressure (IRP)
• Absent peristalsis
• Classification into subtypes (I, II, or III) which directs treatment 6

Timed barium esophagram provides complementary information:

• Achalasia: Dilated esophagus with smooth "bird's beak" tapering at GEJ, delayed emptying 7, 3
• Peptic stricture: Irregular narrowing in distal esophagus, typically shorter segment 7

Transabdominal ultrasound can differentiate when available 7:

• Achalasia: Regular, symmetric wall thickening (mean 4.8mm) localized to GEJ
• Peptic stricture: Irregular thickening (mean 5.1mm) over longer segment
• Malignancy: Marked irregular thickening (mean 17mm)

Treatment Algorithms

For Achalasia

Use pneumatic balloon dilation starting at 30mm diameter in the first session 1:

1. First session: 30mm balloon for 1-3 minutes under endoscopic or fluoroscopic control
2. Second session (2-28 days later): 35mm balloon
3. Third session if Eckardt score >3: Consider 40mm balloon cautiously
4. Post-procedure: Start PPI therapy (10-40% develop GERD after treatment) 1
5. Monitor for 2 hours post-procedure; contrast study only if perforation suspected 1

Alternative treatments include laparoscopic Heller myotomy or POEM (per-oral endoscopic myotomy), particularly for type III achalasia 6. Shared decision-making based on patient factors and local expertise.

For Peptic Stricture

Dilate to 13-15mm diameter using wire-guided bougie or balloon dilators 8, 1:

1. Target diameter: 13-15mm (may need up to 16-20mm if symptoms persist)
2. Can safely pass single large dilator (>15mm) or use larger increments in uncomplicated strictures
3. Tight/complex strictures: Use cautious stepwise approach (traditional "rule of three")
4. Essential: Long-term standard-dose PPI therapy (twice daily if rapid restenosis) 8
5. Repeat dilation every 1-2 weeks until target diameter achieved if needed 1

Expected outcomes: 40-60% require only one dilation; 80% in recent series with widespread PPI use 1

Key Differentiating Features

Feature	Achalasia	Peptic Stricture
Manometry	Impaired LES relaxation, absent peristalsis	Normal (if performed)
Dilation size	30-40mm (to disrupt LES)	13-15mm (to relieve obstruction)
Mechanism	Neuromuscular disorder	Chronic acid injury
PPI role	Post-treatment only (prevent reflux)	Primary therapy + adjunct to dilation
Barium appearance	Smooth bird's beak	Irregular narrowing
Wall thickening	Regular, symmetric at GEJ	Irregular, longer segment

Critical Clinical Pitfalls

1. Never perform antireflux surgery without excluding achalasia first when any element of dysphagia exists 4
2. Do not use weighted bougies blindly—always use wire-guided or endoscopically controlled techniques 1
3. Fluoroscopy is strongly recommended for complex strictures (post-radiation, caustic, long, angulated, multiple) 1
4. Exclude malignancy in all cases—obtain biopsies and consider repeat imaging if rapid restenosis occurs despite adequate PPI therapy 8
5. Consider eosinophilic esophagitis in refractory cases or younger patients with food impaction 1