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Fig. 2 | Cardiovascular Ultrasound

Fig. 2

From: Index of contractile asymmetry improves patient selection for CRT: a proof-of-concept study

Fig. 2

Flowchart of the calculation of index of contractile asymmetry (ICA). Left upper panel: the original curved anatomical M-mode (CAMM) plot of pre-implantation systolic strain rate in an apical four-chamber view in a responder to CRT. The strain rate values contained in the CAMM plot are converted to a table (matrix). ICA is then calculated as standard deviation of the differences in strain rate in two opposing left ventricular walls (here, septum and lateral wall). Left lower panel: scale used in the graphical representation of the strain rate tables (matrices). Right lower panel: density plot of the differences in strain rate between the two walls. In this case, ICA in four-chamber view is 0.97 s− 1. 4ch, four-chamber view; CAMM, curved anatomical M-mode; SD, standard deviation

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