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  • Title: Vitamin C augments the inotropic response to dobutamine in humans with normal left ventricular function.
    Author: Mak S, Newton GE.
    Journal: Circulation; 2001 Feb 13; 103(6):826-30. PubMed ID: 11171790.
    Abstract:
    BACKGROUND: We studied the effect of an antioxidant, the intracoronary infusion of vitamin C, on basal and dobutamine-stimulated left ventricular (LV) contractility. METHODS AND RESULTS: Nineteen patients with normal ventricular function participated in this study. A micromanometer-tipped catheter was inserted into the LV. In the experimental group (n=10), an infusion catheter was positioned in the left main coronary artery. LV peak +dP/dt (LV +dP/dt) was measured in response to the intravenous infusion of dobutamine before (Dob) and during (Dob+vit C) the intracoronary infusion of vitamin C. The intracoronary infusion of vitamin C had no effect on basal LV +dP/dt or any other hemodynamic parameter. The infusion of vitamin C augmented the LV +dP/dt response to dobutamine by 22+/-4% (Dob, 1680+/-76 mm Hg/s; Dob+vit C, 1814+/-97 mm Hg/s, P<0.01). In the control group (n=9), LV +dP/dt was measured in response to sequential infusions of dobutamine (Dob, Dob-2) given at the same time intervals as in the experimental group but without the intracoronary infusion of vitamin C. In contrast to the experimental group, no difference in LV +dP/dt was observed between the 2 infusions of dobutamine (Dob, 1706+/-131 mm Hg/s; Dob-2, 1709+/-138 mm Hg/s, P=NS). CONCLUSIONS: The administration of the antioxidant vitamin C augments the inotropic response to dobutamine in humans. This suggests that redox environment contributes to the adrenergic regulation of ventricular contractility.
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