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Flow responses to 3 bolus intracoronary ATP injections from 1 heart. Injection volumes were 25 μl. Concentrations refer to the ATP concentration in the bolus injectate. Responses to 2 injections at intermediate concentrations are not shown. ATP-induced vasodilation results in transient flow increases in this constant-pressure preparation. Peak increase in flow above baseline was used as the response to each injection.
