J Clin Monit Comput - Comparison of cardiac output determined by bioimpedance and bioreactance methods at rest and during exercise.

Tópicos

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Resumo

Bioreactance is a novel non-invasive method for cardiac output measurement that involves the analysis of blood flow-dependent changes in the phase shifts of electrical currents applied across the chest. The present study (1) compared resting and exercise cardiac outputs determined by bioreactance and bioimpedance methods and those estimated from measured oxygen consumption, (2) determined the relationship between cardiac output and oxygen consumption, and (3) assessed the agreement between the bioreactance and bioimpedance methods. Twelve healthy subjects (aged 30???4?years) performed graded cardiopulmonary exercise test on a recumbent cycle ergometer on two occasions, 1?week apart. Cardiac output was monitored at rest, at 30, 50, 70, 90, 150?W and at peak exercise intensity by bioreactance and bioimpedance and expired gases collected. Resting cardiac output was not significantly different between the bioreactance and bioimpedance methods (6.2???1.4 vs. 6.5???1.4?l?min(-1), P?=?0.42). During exercise cardiac outputs were correlated with oxygen uptake for both bioreactance (r?=?0.84, P?<?0.01) and bioimpedance techniques (r?=?0.82, P?<?0.01). At peak exercise bioimpedance estimated significantly lower cardiac outputs than both bioreactance and theoretically calculated cardiac output (14.3???2.6 vs. 17.5???5.2 vs. 16.9???4.9?l?min(-1), P?<?0.05). Bland-Altman analyses including data from rest and exercise demonstrated that the bioimpedance method reported ~1.5?l?min(-1) lower cardiac output than bioreactance with lower and upper limits of agreement of -2.98 to 5.98?l?min(-1). Bioimpedance and bioreactance methods provide different cardiac output estimates, particularly at high exercise intensity, and therefore the two methods cannot be used interchangeably. In contrast with bioimpedance, bioreactance cardiac outputs are similar to those estimated from measured oxygen consumption.

Resumo Limpo

bioreact novel noninvas method cardiac output measur involv analysi blood flowdepend chang phase shift electr current appli across chest present studi compar rest exercis cardiac output determin bioreact bioimped method estim measur oxygen consumpt determin relationship cardiac output oxygen consumpt assess agreement bioreact bioimped method twelv healthi subject age year perform grade cardiopulmonari exercis test recumb cycl ergomet two occas week apart cardiac output monitor rest w peak exercis intens bioreact bioimped expir gase collect rest cardiac output signific differ bioreact bioimped method vs lmin p exercis cardiac output correl oxygen uptak bioreact r p bioimped techniqu r p peak exercis bioimped estim signific lower cardiac output bioreact theoret calcul cardiac output vs vs lmin p blandaltman analys includ data rest exercis demonstr bioimped method report lmin lower cardiac output bioreact lower upper limit agreement lmin bioimped bioreact method provid differ cardiac output estim particular high exercis intens therefor two method use interchang contrast bioimped bioreact cardiac output similar estim measur oxygen consumpt

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