Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/101994
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Type: Journal article
Title: Correlation of esophageal pressure-flow analysis findings with bolus transit patterns on videofluoroscopy
Author: Omari, T.
Szczesniak, M.
Maclean, J.
Myers, J.
Rommel, N.
Cock, C.
Cook, I.
Citation: Diseases of the Esophagus, 2016; 29(2):166-173
Publisher: Wiley-Blackwell
Issue Date: 2016
ISSN: 1120-8694
1442-2050
Statement of
Responsibility: 
T. I. Omari, M. M. Szczesniak, J. Maclean, J. C. Myers, N. Rommel, C. Cock, I. J. Cook
Abstract: Pressure-flow analysis quantifies the interactions between bolus transport and pressure generation. We undertook a pilot study to assess the interrelationships between pressure-flow metrics and fluoroscopically determined bolus clearance and bolus transport across the esophagogastric junction (EGJ). We hypothesized that findings of abnormal pressure-flow metrics would correlate with impaired bolus clearance and reduced flow across the EGJ. Videofluoroscopic images, impedance, and pressure were recorded simultaneously in nine patients with dysphagia (62-82 years, seven male) tested with liquid barium boluses. A 3.6 mm diameter solid-state catheter with 25 × 1 cm pressure/12 × 2 cm impedance was utilized. Swallowed bolus clearance was assessed using a validated 7-point radiological bolus transport scale. The cumulative period of bolus flow across the EGJ was also fluoroscopically measured (EGJ flow time). Pressure only parameters included the length of breaks in the 20 mmHg iso-contour and the 4 second integrated EGJ relaxation pressure (IRP4s). Pressure-flow metrics were calculated for the distal esophagus, these were: time from nadir impedance to peak pressure (TNadImp to PeakP) to quantify bolus flow timing; pressure flow index (PFI) to integrate bolus pressurization and flow timing; and impedance ratio (IR) to assess bolus clearance. When compared with controls, patients had longer peristaltic breaks, higher IRs, and higher residual EGJ relaxation pressures (break length of 8 [2, 13] vs. 2 [0, 2] cm, P = 0.027; IR 0.5 ± 0.1 vs. 0.3 ± 0.0, P = 0.019; IRP4s 11 ± 2 vs. 6 ± 1 mmHg, P = 0.070). There was a significant positive correlation between higher bolus transport scores and longer peristaltic breaks (Spearman correlation r = 0.895, P < 0.001) and with higher IRs (r = 0.661, P < 0.05). Diminished EGJ flow times correlated with a shorter TNadImp to PeakP (r = -0.733, P < 0.05) and a higher IR (r = -0.750, P < 0.05). Longer peristaltic breaks and higher IR correlate with failed bolus clearance on videofluoroscopy. The metric TNadImp to PeakP appears to be a marker of the period of time over which the bolus flows across the EGJ.
Keywords: Dysphagia; high-resolution manometry; impedance; pressure; videofluoroscopy
Rights: © 2014 International Society for Diseases of the Esophagus
RMID: 0030017627
DOI: 10.1111/dote.12300
Appears in Collections:Medicine publications

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