Why the study?
Does the Valsalva maneuver reduce left coronary blood flow velocity in patients?
Does the Valsalva maneuver reduce left coronary blood flow velocity in patients?
The Valsalva maneuver significantly reduces coronary blood flow velocity, which may explain adverse cardiovascular events such as 'bedpan death' in susceptible patients.
Answers are grounded in this paper and cite their sources.
May warrant caution with Valsalva in cardiac patients; hypothesis-generating for rare adverse events.
Effects of the Valsalva maneuver on left coronary blood flow velocity were assessed in 15 patients with the Doppler catheter tip flowmeter. Straining against a closed glottis induced a decline of coronary flow velocity that ranged from 14% to 72%, with a mean of 45% for the study group. In seven of eight patients who executed the Valsalva maneuver twice the maximum decrease of coronary flow velocity was related to the magnitude of mean right atrial pressure rise. In three subjects with heart disease there was an unexpected continuous reduction of coronary flow velocity long into the poststraining period. These adverse consequences of the Valsalva maneuver on coronary blood velocity may account for some cases of "bedpan death."
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Alberto Benchimol (1972) studied this question.
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