Key result
Heart failure patients exhibit flat heart rate, unchanged stroke volume, and higher VE/VCO2 at peak exercise.
Why the study?
Different determinants of cardiopulmonary exercise response in patients with left ventricular dysfunction with mild or symptomatic chronic heart failure were not fully characterized.
How do cardiopulmonary and hemodynamic responses to exercise differ between patients with asymptomatic left ventricular dysfunction, symptomatic heart failure, and healthy controls?
Comparison
Patients with LVD or HF vs sedentary healthy male controls
Design
Cross-sectional study with upright bicycle exercise and noninvasive gas exchange and impedance cardiography monitoring
Authors
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May distinguish symptomatic HF from asymptomatic LVD via exercise hemodynamics; hypothesis-generating and requires prospective validation before clinical use.
Cross-Sectional (n=28)
How do cardiopulmonary and hemodynamic responses to exercise differ between patients with asymptomatic left ventricular dysfunction, symptomatic heart failure, and healthy controls?
Noninvasive monitoring with impedance cardiography and gas exchange reveals that symptomatic heart failure patients fail to augment stroke volume or decrease systemic vascular resistance during exercise, unlike asymptomatic patients with similar left ventricular dysfunction.
Monteforte et al. (2008) conducted a cross-sectional in Left ventricular dysfunction or heart failure (n=28). Left ventricular dysfunction or heart failure vs. Sedentary male controls was evaluated on Cardiopulmonary response including VO2, heart rate, stroke volume, and VE/VCO2 ratio. Patients with heart failure exhibited a flat heart rate increase, unchanged stroke volume, and higher VE/VCO2 ratio at peak exercise compared to controls during upright bicycle testing.
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