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Updated: 5 days 4 min ago

Isometric handgrip echocardiography: A noninvasive stress test to assess left ventricular diastolic function.

Wed, 01/30/2019 - 08:31
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Isometric handgrip echocardiography: A noninvasive stress test to assess left ventricular diastolic function.

Clin Cardiol. 2017 Dec;40(12):1247-1255

Authors: Jake Samuel T, Beaudry R, Haykowsky MJ, Sarma S, Park S, Dombrowsky T, Bhella PS, Nelson MD

Abstract
BACKGROUND: Cycle exercise echocardiography is a useful tool to "unmask" diastolic dysfunction; however, this approach can be limited by respiratory and movement artifacts. Isometric handgrip avoids these issues while reproducibly increasing afterload and myocardial oxygen demand.
HYPOTHESIS: Isometric handgrip echocardiography (IHE) can differentiate normal from abnormal diastolic function.
METHODS: First recruited 19 young healthy individuals (mean age, 24 ± 4 years) to establish the "normal" response. To extend these observations to a more at-risk population, we performed IHE on 17 elderly individuals (mean age, 72 ± 6 years) with age-related diastolic dysfunction. The change in the ratio of mitral valve inflow velocity to lateral wall tissue velocity (E/e'), a surrogate for left ventricular filling pressure, was used to assess the diastolic stress response in each group.
RESULTS: In the young subjects, isometric handgrip increased heart rate and mean arterial pressure (25 ± 12 bpm and 26 ± 17 mmHg, respectively), whereas E/e' changed minimally (0.6 ± 0.9). In the elderly subjects, heart rate and mean arterial pressure were similarly increased with isometric handgrip (19 ± 16 bpm and 25 ± 11 mmHg, respectively), whereas E/e' increased more dramatically (2.3 ± 1.7). Remarkably, 11 of the 17 elderly subjects had an abnormal diastolic response (ΔE/e': 3.4 ± 1.1), whereas the remaining 6 elderly subjects showed very little change (ΔE/e': 0.3 ± 0.7), independent of age or the change in myocardial oxygen demand.
CONCLUSIONS: IHE is a simple, effective tool for evaluating diastolic function during simulated activities of daily living.

PMID: 29247511 [PubMed - indexed for MEDLINE]