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Analysis of simultaneous acquired trigger signals. Bland-Altman plot of mean RR intervals and trigger signal intervals determined by (a) electrocardiogram (ECG) and Doppler ultrasound (DUS) and (c) ECG and pulse oximetry (POX). Dashed lines represent the confidence interval of ±1.96 of the standard deviation. Correlation between visually determined quiescent diastolic heart phases and time between R-wave and trigger signals of (b) DUS and (d) POX.
