Key result
Local infusion of ouabain at 2 micrograms/min for 1 hour caused a 26% reduction in forearm blood flow and reduced the dilator response to potassium by 33%.
Why the study?
Does local infusion of ouabain alter forearm vascular resistance and dilator responses to potassium, verapamil, and sodium nitroprusside in normotensive men?
Population
15 normotensive male volunteers
Comparison
Local infusion of ouabain into the brachial… vs Baseline/pre-infusion state
Design
Other
Follow-up
1 hour
Authors
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Ouabain-induced vascular changes mimic hypertension; supports Na/K pump hypothesis but leaves open clinical relevance.
Does local infusion of ouabain alter forearm vascular resistance and dilator responses to potassium, verapamil, and sodium nitroprusside in normotensive men?
Effect estimate: 26% reduction
Acute depression of sodium pump activity by ouabain reproduces the increased resting vascular resistance and impaired response to potassium seen in hypertension, but does not explain the enhanced responsiveness to verapamil.
Robinson et al. (1983) studied Primary hypertension (mechanisms) (n=15). Local infusion of ouabain was evaluated on Forearm blood flow (26% reduction). Local infusion of ouabain at 2 micrograms/min for 1 hour caused a 26% reduction in forearm blood flow and reduced the dilator response to potassium by 33%.
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