Clinical utility of cricopharyngeal distensibility measurements during endoscopic myotomy for Zenker's diverticulum.

Gastrointestinal Endoscopy
Linda Yun ZhangPhilip Ian Craig

Abstract

Flexible endoscopic cricopharyngeal myotomy (FECM) allows minimally invasive treatment of patients with Zenker's diverticulum (ZD); however, retreatment rates are substantial. We hypothesized that the functional lumen imaging probe (FLIP) may provide insight into ZD pathophysiology and serve as an intraprocedural guide to adequacy of myotomy. We prospectively evaluated 11 ZD patients undergoing FECM and compared the baseline cricopharyngeal (CP) distensibility with 16 control subjects. Intraprocedural CP distensibility was measured immediately pre- and postmyotomy. The CP distensibility index (CP-DI) was defined as a ratio of the narrowest cross-sectional area (nCSA) and the corresponding intrabag pressure at 40 mL distension. Same-procedure myotomy extension was undertaken in a subgroup if threshold distensibility changes were not met. ZD patients had reduced baseline nCSA and CP-DI compared with control subjects, (169.6 vs 227.5 mm2 [P < .001] and 3.8 vs 7.6 mm2/mm Hg [P < .001], respectively). After CP myotomy, both nCSA and CP-DI increased significantly by an average of 74.2 mm2 (95% confidence interval [CI], 35.1-113.3; P = .002) and 2.2 mm2/mm Hg (95% CI, .6-3.8; P = .01), respectively. In the subgroup with no significant...Continue Reading

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