Improved Accuracy of Automated Estimation of Cardiac Output Using Circulation Time in Patients with Heart Failure

Abstract Background Lung-to-Finger Circulation Time (LFCT) of oxygenated blood during nocturnal periodic breathing in heart failure patients (HF) measured using polysomnography (PSG) correlates negatively with cardiac function but possesses limited accuracy for cardiac output (CO) estimation. Methods and Results CO was re-calculated from LFCT using a multivariable linear model with information on age and average overnight heart-rate in 25 patients who underwent evaluation of HF. The multivariable model decreased the percentage error to 22.3% relative to invasive CO measured during cardiac catheterization. Conclusions This improved automated non-invasive CO estimation using multiple variables meets a recently proposed performance criterion for clinical acceptability of non-invasive CO estimation, and compares very favorably with other available methods.