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Am J Med. 1993 Jun;94(6):608-10.

Influence of labetalol on cocaine-induced coronary vasoconstriction in humans.

Author information

  • 1Department of Internal Medicine (Cardiovascular Division), University of Texas Southwestern Medical Center, Dallas 75235.

Abstract

PURPOSE:

Although labetalol is sometimes given to patients with cocaine-associated chest pain, its influence on cocaine-induced coronary vasoconstriction is unknown.

PATIENTS AND METHODS:

In 15 patients (7 men, 8 women, aged 40 to 79 years) undergoing catheterization for chest pain, heart rate, mean arterial pressure, and coronary arterial area (by computer-assisted quantitative angiography) were measured (1) at baseline, (2) 15 minutes after intranasal cocaine, 2 mg/kg, then (3) 5 minutes after intravenous saline (n = 6) or labetalol, 0.25 mg/kg (n = 9).

RESULTS:

Of 40 coronary arterial segments analyzed, cocaine induced a 13% +/- 10% (mean +/- standard deviation) decrease in coronary arterial area in 32. Subsequently, no variable changed after saline administration. Although labetalol reduced mean arterial pressure (117 +/- 14 mm Hg after cocaine, 110 +/- 11 mm Hg after labetalol; p < 0.05), it induced no change in the coronary arterial area (3.47 +/- 1.37 mm2 after cocaine, 3.37 +/- 1.32 mm2 after labetalol; p = NS).

CONCLUSION:

Labetalol reverses the cocaine-induced rise in mean arterial pressure, but does not alleviate cocaine-induced coronary vasoconstriction.

PMID:
8506886
[PubMed - indexed for MEDLINE]
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