Cold sensitivity in essential hypertension: the effect of beta- and combined alpha- and beta-blockade

• Published in: European journal of clinical pharmacology Vol. 29; no. 1; p. 33
• Main Authors: Cooke, E D, Bowcock, S A, Smith, A T
• Format: Journal Article
• Language: English
• Published: Germany 1985
• Subjects: Adrenergic alpha-Antagonists - administration & dosage; Adrenergic alpha-Antagonists - pharmacology; Adrenergic beta-Antagonists - administration & dosage; Adrenergic beta-Antagonists - pharmacology; Adult; Aged; Cold Temperature; Female; Humans; Hypertension - physiopathology; Male; Middle Aged; Vasoconstriction
• ISSN: 0031-6970
• DOI: 10.1007/BF00547365

The presence of cold sensitivity was investigated in three groups of patients; untreated hypertensives and hypertensives treated by a beta-adrenoceptor blocker (propranolol) or by a combined alpha- and beta-adrenoceptor blocker (labetalol) at two ambient temperatures. At a comfortable ambient (24 degrees C) one-third of the untreated and those treated with beta-blockade only showed cold sensitivity as compared with 16% of patients on the combined therapy. Under conditions of mild cold stress (20 degrees C) cold sensitivity increased in frequency in all three groups, more than half of the untreated and beta-blocked patients were affected and greater than one-third of those with alpha- and beta-blockade. These findings indicate that in the general population of hypertensives treatment with beta-adrenoceptor blockade alone may have little effect on the peripheral vasculature and that a useful degree of protection may be provided by therapy which blocks both receptors.