Measurement of cardiac output during exercise in healthy, trained humans using lithium dilution and pulse contour analysis.

Elliott, Adrian, Skowno, Justin, Prabhu, Mahesh and Ansley, Les (2012) Measurement of cardiac output during exercise in healthy, trained humans using lithium dilution and pulse contour analysis. Physiological Measurement, 33. pp. 1691-1701. ISSN 0967-3334

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Abstract

The aim of this study was to evaluate the use of pulse contour analysis calibrated with lithium dilution in a single device (LiDCOTM) for measurement of cardiac output (Q ̇) during exercise in healthy volunteers. We sought to; (a) compare pulse contour analysis (PulseCO) and lithium indicator dilution (LiDCO) for the measurement of Q ̇ during exercise, and (b) assess the requirement for recalibration of PulseCO with LiDCO during exercise. Ten trained males performed multi-stage cycling exercise at intensities below and above ventilatory threshold before constant load maximal exercise to exhaustion. Uncalibrated PulseCO Q ̇ (Q ̇raw) was compared to that calibrated with lithium dilution at baseline (Q ̇baseline), during submaximal exercise below (Q ̇low) and above (Q ̇high) ventilatory threshold, and at each exercise stage individually (Q ̇exercise). There was a significant difference between Q ̇baseline and all other calibration methods during exercise, but not at rest. No significant differences were observed between other methods. Closest agreement with Q ̇exercise was observed for Q ̇high (bias ± limits of agreement: 4.8 ± 30.0%). The difference between Q ̇exercise and both Q ̇low and Q ̇raw was characterized by low bias (4–7%) and wide limits of agreement (> ± 40%). Calibration of pulse contour analysis with lithium dilution prior to exercise leads to a systematic overestimation of exercising cardiac output. A single calibration performed during exercise above the ventilatory threshold provided acceptable limits of agreement with an approach incorporating multiple calibrations throughout exercise. Pulse contour analysis may be used for Q ̇ measurement during exercise
providing the system is calibrated during exercise.

Item Type:	Article
Uncontrolled Keywords:	indicator dilution, stroke volume, haemodynamics, arterial pressure waveform
Subjects:	A100 Pre-clinical Medicine B800 Medical Technology B900 Others in Subjects allied to Medicine C600 Sports Science
Department:	Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Related URLs:	Publisher
Depositing User:	Les Ansley
Date Deposited:	21 Sep 2012 11:44
Last Modified:	12 Oct 2019 15:29
URI:	http://nrl.northumbria.ac.uk/id/eprint/9092

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