Fig. 1From: Peroral Endoscopic Myotomy (POEM) for the treatment of achalasia in an Egyptian cohortHigh-resolution manometry showing different types of achalasia (IRP4s > ULN and 100% failed peristalsis or spasm). A Type I: No contractility. B Type II: > 20% panesophageal pressurization. C Type III: > 20% spasm (DL < 4.5 s). IRP4s: integrated relaxation pressure for 4 s, DL: distal latencyBack to article page