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Number of responders with regard to diastolic blood pressure upon infusion of phenylephrine. Responders were defined as subjects with an increase of >7.6 mm Hg in diastolic pressure upon the highest agonist dose allowed in the protocol. Shown are the number of responders out of 10 subjects studied at the indicated times following intake of placebo (open circles), 0.4 mg tamsulosin (filled squares) or 5 mg terazosin (open squares).
