Figure 1

Construction of an uncalibrated Q^tri derived from the measured pressure waveform in a rat at baseline (A) and at 30 (B), 60 (C), and 90 (D) min post-ECLS. In (E–H), the aortic impulse response function curve derived from the measured aortic pressure and its assumed Q^tri. In (I–L), the amplitudes (peak – trough) of the P_f and P_b are described by |P_f| and |P_b|, respectively. CL = cardiac cycle length; HR = basal heart rate; LVET = left ventricular ejection time; P_b = backward pressure wave; P_d = diastolic pressure; P_f = forward pressure wave; P_m = mean aortic pressure; P_s = systolic pressure; PP = pulse pressure; Q^tri = triangular flow; RM = wave reflection magnitude, given by |P_b|/|P_f|; RI = wave reflection index, given by |P_b|/(|P_f| + |P_b|); τ_w = wave transit time.