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Impedance nadir values correlate with barium bolus amount.

Abstract：

:We examined the value of impedance monitoring in measuring bolus volume compared with videoesophagram. Eighty consecutive subjects were studied with simultaneous impedance-manometry-videoesophagram. A catheter with both an impedance electrode pair and a pressure transducer at four sites (5, 10, 15, 20 cm above lower esophageal sphincter) was passed per nares. Six 10-cc boluses of 45% barium mixed with 0.9% NaCl were swallowed at 20- to 30-second intervals. When impedance fell to below 1000 ohms, other than that occurring during administered swallows, the videofluoroscopic image corresponding to the time of impedance nadir was reviewed. If barium was present at the impedance site, barium area was calculated. The video was reviewed for the cause of abnormal barium transit causing barium presence. We found 38/80 subjects had a total of 169 impedance falls to below 1000 ohms. Ninety-seven percent (164/169) of impedance falls had barium present at the impedance site, and there was good correlation (r = 0.83, P < 0.001) between impedance nadir value and barium area. The impedance nadir value : barium area relationship was similar for the three causes of barium presence identified by video: failed bolus clearing; gastroesophageal reflux; and esophageal escape. Impedance nadir values 700-999 ohms usually had a small barium area. In contrast, nadir values <400 ohms had a large barium area covering all or most of the catheter and filling the esophagus at the impedance site. Impedance falls from >1000 ohms to a low nadir value from all forms of abnormal esophageal bolus transit imply a large bolus amount.

journal_name

Dis Esophagus

journal_title

Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus

authors

Imam H,Marrero F,Shay S

doi

10.1111/j.1442-2050.2011.01302.x

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

600-7

issue

7

eissn

1120-8694

issn

1442-2050

journal_volume

25

pub_type

杂志文章

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