Key result
Esophageal manometry at a prescribed perfusion rate of 1.25 ml/min compared well with direct intraluminal pressure measurements, while higher rates artificially increased contraction amplitudes.
Why the study?
Does a prescribed perfusion rate based on compliance improve the accuracy of esophageal manometry compared to direct intraesophageal transducer measurement in subjects undergoing motility tests?
Does a prescribed perfusion rate based on compliance improve the accuracy of esophageal manometry compared to direct intraesophageal transducer measurement in subjects undergoing motility tests?
Proper selection of perfusion rate based on transducer-catheter compliance is essential for accurate esophageal manometry, as high rates can artificially increase contraction amplitudes.
Answers are grounded in this paper and cite their sources.
May inform perfusion rate selection to avoid amplitude artifacts in esophageal manometry; leaves open validation across catheter systems.
The accuracy of esophageal manometry using the conventional perfused three-lumen catheter depends on the proper choice of the perfusion rate. Previous investigators have used a wide range of perfusion rates without considering the compliance of the transducer-catheter assembly as a variable in the selection of the perfusion rate for the hydraulic systems. We present a relationship relating the perfusion rate and the compliance which specifies the minimum adequate perfusion rate for a given transducer-catheter assembly. This approach explains apparent discrepancies in the literature regarding the proper rate of perfusion for accurate measurement of esophageal contractions. Esophageal motility tests with 10 subjects confirmed the accuracy of manometric tests at the prescribed perfusion rate (1.25 ml/min) since they compared well with intraluminal pressures measured directly with a Honeywell intraesophageal transducer. The effect of perfusion rate on the apmlitude of esophageal contraction was also investigated and it is shown that high perfusion rates result in increased amplitudes of contraction. Furthermore, at large perfusion rates a large volume of liquid builds up in the esophagus. This fluid accumulation could possibly be responsible for the increased amplitudes of contraction.
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Zabinski et al. (1975) studied Esophageal motility (n=10). Prescribed perfusion rate vs. Direct intraluminal pressure measurement (Honeywell intraesophageal transducer) was evaluated on Accuracy of manometric tests and amplitude of esophageal contraction. Esophageal manometry at a prescribed perfusion rate of 1.25 ml/min compared well with direct intraluminal pressure measurements, while higher rates artificially increased contraction amplitudes.
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