Why the study?
Does labetalol offer advantages over pure beta blockers in managing hypertension and other cardiovascular conditions?
Does labetalol offer advantages over pure beta blockers in managing hypertension and other cardiovascular conditions?
Labetalol provides an effective alternative to pure beta blockers for difficult-to-control hypertension and catecholamine crises due to its combined alpha- and beta-blocking properties.
Supports labetalol for hypertension when preserving output and flow matters; leaves open randomized confirmation versus pure beta blockers.
BACKGROUND: Labetalol, a compound that blocks both alpha- and beta-adrenergic receptors, is the only drug of its class currently available in the United States. OBJECTIVE: To review the pharmacology of labetalol and related compounds. SUMMARY: Unlike "pure" beta blockers, labetalol maintains cardiac output, reduces total peripheral resistance, and does not decrease peripheral blood flow. It has been used to treat hypertension of all degrees of severity and may be especially useful in black patients, elderly patients, patients with renal disease, and in pregnancy. It can be used in conditions that produce catecholamine crises, such as pheochromocytoma, clonidine withdrawal, and cocaine overdose. Its hemodynamic profile is attractive for use in myocardial ischemia. The parenteral form is useful in situations where blood pressure must be lowered quickly. The major side effect is orthostatic hypotension, and hepatotoxicity has been reported. CONCLUSIONS: Labetalol has several advantages over pure beta-blocking drugs and offers an alternative in managing hypertension that is difficult to control.
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Vidt et al. (1994) studied this question.
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