. Author manuscript; available in PMC: 2010 Jun 16.

Published in final edited form as: Am J Gastroenterol. 2009 Aug 18;104(11):2721–2728. doi: 10.1038/ajg.2009.467

Table 3.

Integrity of esophageal peristalsis classified using 20, 25, or 30 mm Hg isobaric contour thresholds as a predictor of complete bolus clearance

Isobaric contour threshold (mm Hg)	Swallow classification	Complete bolus clearance (n = 170)	Incomplete bolus clearance (n = 70)
20	Normal	170	0
	Focal hypotension	0	14
	Diffuse hypotension	0	30
	Absent peristalsis	0	26
25	Normal	167	0
	Focal hypotension	3	10
	Diffuse hypotension	0	34
	Absent peristalsis	0	26
30	Normal	157	0
	Focal hypotension	13	9
	Diffuse hypotension	0	35
	Absent peristalsis	0	26

Breaks in the isobaric contour <2 cm in length were classified as normal, 2 to 5 cm as focal hypotension, and 5 cm as diffuse hypotension.