Key result
Obstruction of the iliocaval venous outflow impairs exercise tolerance by limiting venous return, which subsequently reduces stroke volume and cardiac output during physical exertion.
Why the study?
Increasing venous return is critical during exercise, but the effects of peripheral venous obstruction on cardiac function have not been well described.
Answers are grounded in this paper and cite their sources.
Iliocaval venous obstruction can significantly impair exercise tolerance by limiting venous return and cardiac preload reserve, highlighting a potential peripheral venous contribution to exercise limitation in conditions like HFpEF.
Cardiac output during exercise increases by as much as fivefold in the untrained man, and by as much as eightfold in the elite athlete. Increasing venous return is a critical but much overlooked component of the physiological response to exercise. Cardiac disorders such as constrictive pericarditis, restrictive cardiomyopathy and pulmonary hypertension are recognised to impair preload and cause exercise limitation; however, the effects of peripheral venous obstruction on cardiac function have not been well described. This manuscript will discuss how obstruction of the iliocaval venous outflow can lead to impairment in exercise tolerance, how such obstructions may be diagnosed, the potential implications of chronic obstructions on sympathetic nervous system activation, and relevance of venous compression syndromes in heart failure with preserved ejection fraction.
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Morris et al. (2020) conducted a review in Iliocaval venous obstruction. Obstruction of the iliocaval venous outflow impairs exercise tolerance by limiting venous return, which subsequently reduces stroke volume and cardiac output during physical exertion.
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