
Keywords: تزریق سم بوتولینوم; Achalasia; Jackhammer esophagus; Distal esophageal spasm; Botulinum toxin injection; Chest pain; ACG; American College of Gastroenterology; BT; botulinum toxinDCIdistal contractile integralEGJesophago-gastric junctionEGJOOesophago-gastric junction outflow