Bedside IVC Echocardiography to Distinguish Autonomic Dysfunction–Predominant Orthostasis From Right Ventricular Failure in Patients With LVADs

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  Visual Summary. Visual Summary Bedside posture-linked IVC assessment in LVAD orthostasis. After optimization of device settings and volume status, supine subcostal IVC assessment is performed with paired LVEDD and qualitative RV evaluation, then repeated after 3 to 5 minutes upright. Interpretation emphasizes the directional change in IVC size and collapsibility with posture rather than static supine IVC diameter alone. A small or collapsible IVC with marked upright collapse supports autonomic dysfunction–predominant orthostatic hypotension or preload-reserve limitation, whereas a dilated, poorly collapsible IVC with minimal posture-linked change suggests RV failure–predominant orthostatic intolerance. Discordant or severe findings should prompt right-heart catheterization or formal autonomic testing. IVC = inferior vena cava; LVAD = left ventricular assist device; LVEDD = left ventricular end-diastolic dimension; MAP = mean arterial pressure; OH = orthostatic hypotension; RV = right ventricular.

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  Figure 1. Posture-Linked IVC Response in LVAD Patients With Orthostatic Symptoms (A and B) RV failure physiology, with a plethoric IVC that remains enlarged from supine to standing posture, changing from 2.6 cm to 2.4 cm. (C and D) Autonomic dysfunction–predominant orthostatic hypotension, with a smaller IVC that decreases from 1.7 cm supine to 0.7 cm standing. Measurements were obtained from subcostal IVC views at end-expiration during quiet respiration. The contrasting posture-linked IVC responses illustrate a bedside discriminator between RV-limited forward flow and autonomic/preload-reserve limitation. IVC = inferior vena cava; LVAD = left ventricular assist device; RV = right ventricle.