Abstract:Objective To evaluate the efficacy of POEM by high-resolution manometry before and after POEM for AC patients, and explore the value of HRM in treatment of AC with POEM.Methods 26 cases were diagnosed as achalasia and treated with POEM from January 2018 to December 2019. Pre-operation Eckardt score, esophageal pressure UESP, LESP, 4sIRP, LESL and followed up for 6 months Eckardt score, esophageal pressure UESP, LESP, 4sIRP, LESL were recorded, and analysis of pre-operation and post-operation scores and pressure data whether changes had significant difference and correlation.Results The Eckardt score of 26 patients were (6.50 ± 1.30) and (1.04 ± 0.53), with significant difference (P < 0.05). Pre-operation and post-operation UESP were (50.15 ± 16.74) and (44.70 ± 11.71) mmHg (P > 0.05), no significant difference was observed. LESP were (30.92 ± 10.49) and (17.40 ± 6.14) mmHg and 4sIRP were (22.16 ± 7.75) and (9.45 ± 4.23) mmHg respectively, all had significant difference (P < 0.05). 4sIRP and Eckardt score had significant correlation (r = 0.55, P < 0.05), and type Ⅱ patients had better changes.Conclusion Peroral endoscopic myotomy was safe and effective. Patients with type Ⅱ were better response to treatment,and 4sIRP could evaluate the effect of the treatment.