<prompt> The characteristic esophageal manometry finding in achalasia cardia is:Impaired lower esophageal sphincter relaxation and absent peristalsisImpaired lower esophageal sphincter relaxation and increased peristalsisDecreased lower esophageal sphincter pressure and absent peristalsisDecreased lower esophageal sphincter pressure and increased peristalsis  <response>: Achalasia is characterized by impaired lower esophageal sphincter LES relaxation and absent peristalsis. Esophageal manometry is the most sensitive test to diagnose achalasia. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 2431 