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What is In achalasia cardia, true is - and explain in detail?
The pressure is elevated at LES with incomplete relaxation on deglutition. The normal pressure of LES is 13.8 ±4.6 of Hg. In Achlasia it increases to twice normal.

Also know

Hypertensive Lower esophageal sphincter

is another motor disorder distinct from Achalsia
here the LES pressure is elevated but it relaxes normally. Peristalsis in the esophageal body is also normal.