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The Effect of Lower Body Positive Pressure on Left Ventricular Ejection Duration in Patients With Heart Failure
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The Effect of Lower Body Positive Pressure on Left Ventricular Ejection Duration in Patients With Heart Failure
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The Effect of Lower Body Positive Pressure on Left Ventricular Ejection Duration in Patients With Heart Failure
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Journal Article
The Effect of Lower Body Positive Pressure on Left Ventricular Ejection Duration in Patients With Heart Failure
2018
Overview
Lower body positive pressure (LBPP) treadmill activity might benefit patients with heart failure (HF). To determine the short-term effects of LBPP on left ventricular (LV) function in HF patients, LV ejection duration (ED), a measure of systolic function was prospectively assessed in 30 men with stable HF with LV ejection fraction ≤ 40% and 50 healthy men (N). Baseline measurements (100% body weight), including blood pressure (BP), heart rate (HR) and LVED, obtained via radial artery applanation tonometry, were recorded after 2 minutes of standing on weight support treadmill and after LBPP achieving reductions of 25%, 50%, and 75% of body weight in random sequence. Baseline, HR, and LVED (251 ± 5 vs 264 ± 4 ms; P = .035) were lower in the HF group. The LBPP lowered HR more (14% vs 6%, P = .009) and increased LVED more (15% ± 7% vs 10% ± 6%; P = .004) in N versus HF. Neither group had changes (Δ) in BP. On generalized linear regression, the 2 groups showed different responses (P < .001). Multivariate analysis showed %ΔHR (P < .001) and HF (P = .026) were predictive of ΔED (r
2 = 0.44; P < .001). In conclusion, progressive LBPP increases LVED in a step-wise manner in N and HF patients independent of HR lowering. The ΔLVED is less marked in patients with HF.
Publisher
SAGE Publications,SAGE PUBLICATIONS, INC,SAGE Publishing
Subject
