Contractile vigor is assessed using the DCI: a contraction with a DCI <100 mmHg•s•cm is failed (panel A), a contraction with a DCI >100 but <450 mmHg•s•cm is weak (panel B), and a hypercontractile swallow is defined as a DCI >8000 mmHg•s•cm (panel C). Premature contraction is defined as a DL <4.5 seconds (panel D). A weak contraction (DCI <450 mmHg•s•cm) with a reduced distal latency is considered failed (panel E). A contraction with a normal DCI (450 to 8000 mmHg•s•cm) and a large break in the 20 mmHg isobaric contour (>5 cm) is a fragmented contraction (panel F).
From: Kahrilas PJ, Bredenoord AJ, Fox M, et al, and The International High Resolution Manometry Working Group. The Chicago Classification of esophageal motility disorders, v3.0. Neurogastroenterol Motil 2015; 27:160.
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