PMC7307621_01
(a) Parasternal long-axis two-dimensional view and (b) apical four-chamber view at rest (40 beats/min) demonstrating mild left ventricular enlargement. M-mode assessment at rest (c) and after squatting (80 beats/min) (d) demonstrating significant decrease in end-systolic dimension and increase in calculated ejection fraction with squatting
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F1
LV ejection fraction was calculated as 47% (linear ejection fraction by M mode at 44%), and wall motion analysis was consistent with mild generalized hypokinesis without regional wall motion abnormalities [Figure 1 and Video 1]. LV stroke volume index was calculated as 94 mL (inde x 56 ml/m2 square), and cardiac output was calculated as 4.15 L/min (cardiac inde x 2.19 L/min/m2). The patient's heart rate increased to 80 beats/min after repetitive squatting, and repeat imaging showed a significant improvement of biplane ejection fraction to 64% (two-dimensional ejection fraction by M mode 57%) and decrease of end-systolic biplane volume from 121 to 59 mL [Figure 1 and Video 2].