This operation is specifically for achalasia , a condition in which the valve between the oesophagus and stomach (lower oesophageal sphincter, LOS) is abnormally tight, and the pumping action of the oesophagus itself is abnormal resulting in dysphagia (inability to swallow).
The abnormally high pressure LOS is completely weakened by splitting the muscle along its length (lower oesophagus, upper stomach). Left in this state, patients would automatically get reflux disease, so a partial wrap is made to create a new valve as a barrier to reflux. Because most patients with achalasia also have a poorly functioning oesophagus, a full wrap is avoided.
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