Why the study?
What are the compensatory mechanisms that allow patients with severe left ventricular dysfunction to achieve normal exercise capacity?
Population
6 patients with severe left ventricular dysfunction who achieved nearly normal levels of exercise tolerance.
Comparison
Supine and upright exercise vs Rest
Design
Case_series
Authors
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Exercise position modulates hemodynamics in severe LV dysfunction; leaves open the contribution of posture to compensatory exercise capacity.
What are the compensatory mechanisms that allow patients with severe left ventricular dysfunction to achieve normal exercise capacity?
Multiple compensatory mechanisms, including chronotropic competence, ventricular dilation, and tolerance of elevated wedge pressures, allow some patients with severe LV dysfunction to achieve normal exercise capacity, emphasizing the need for direct assessment of LV function.
Litchfield et al. (1982) studied this question.
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