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Fig. 7 | The Ultrasound Journal

Fig. 7

From: Rationale for using the velocity–time integral and the minute distance for assessing the stroke volume and cardiac output in point-of-care settings

Fig. 7

a Left ventricular outflow tract velocity–time integral (LVOT VTI) in severe aortic regurgitation. LVOT VTI showed high values (yellow box), overestimating the stroke volume. Asterisks: aliased spectral Doppler signal of aortic regurgitation. b LVOT VTI in dynamic LVOT obstruction, obtained with continuous wave Doppler (pulsed-wave Doppler waveforms were aliased). The spectral Doppler showed high blood flow peak velocities (4.2 m/s, yellow box) and a long time-to-peak signal. This situation can be seen in severe hypovolemia, hypertrophic cardiomyopathy, anterior myocardial infarctions with hypercontractile basal segments and in Takotsubo syndrome

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