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Bar graph shows time course of coronary vessel diameter change after ISDN administration in four groups studied. Significant vasodilation was observed immediately after ISDN administration and persisted throughout time course (P < .02). Vasodilation was greater (P < .03) with 5-mg than with 2.5-mg ISDN dose. Vasodilation between GRE and SSFP sequences was similar. Error bars = standard deviations.
