Abstract
Calcium antagonist pretreatment and intracoronary high doses of nitrates (9 mg of isosorbide dinitrate) do not counteract coronary vasoconstriction occurring after rotational atherectomy. In 30 patients undergoing Rotablator atherectomy, intracoronary injection of the alpha 1-sympathetic blocker urapidil abolished or prevented significant vasoconstriction occurring 15 minutes after the procedure despite repeated injections of nitrates.
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