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The effects of single‐dose atenolol, labetalol, and propranolol on cardiac and vascular function
Author(s) -
Holtzman Jordan L,
Finley Denise,
Johnson Bradford,
Berry Donald A,
Sirgo Mark A
Publication year - 1986
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1038/clpt.1986.174
Subject(s) - labetalol , atenolol , propranolol , blood pressure , heart rate , vascular resistance , anesthesia , hemodynamics , cardiac output , medicine , placebo , pharmacology , cardiology , alternative medicine , pathology
The pharmacodynamic effects of single oral doses of atenolol (100 mg), labetalol (300 mg), and propranolol (80 mg) were compared with those of placebo in a randomized, double‐blind, Latin square design in 12 patients with hypertension. Atenolol and propranolol both significantly reduced cardiac output (−0.55 vs. −0.31 L/min) and heart rate (−8.0 vs. −6.6 bpm), whereas labetalol had no effect on either parameter (− 0.08 L/min; +1.0 bpm). Labetalol significantly reduced vascular resistance (− 339 dynes · cm/sec 5 ), but atenolol and propranolol did not (147 vs. 62 dynes · cm/sec 5 ). Only labetalol significantly reduced the systolic (−15.3 mm Hg), diastolic (−11.5 mm Hg), and mean blood pressures (−12.8 mm Hg). Atenolol significantly reduced only diastolic blood pressure (−5.20 mm Hg), whereas propranolol failed to lower these parameters significantly. These data indicate that the hemodynamic profile of labetalol differs from that of selective and nonselective β‐blockers. Labetalol lowered blood pressure primarily by reducing vascular resistance, whereas reductions in heart rate and cardiac output were the predominant effects of atenolol and propranolol. Clinical Pharmacology and Therapeutics (1986) 40, 268–273; doi: 10.1038/clpt.1986.174