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(Hypertension. 1998;31:68.)
© 1998 American Heart Association, Inc.
Scientific Contributions |
Baroreflex Control of Sympathetic Nerve Activity in Essential and Secondary Hypertension
From Cattedra di Medicina Interna, Ospedale S.Gerardo dei Tintori, Monza, Università di Milano (G.G., G.M.), Centro di Fisiologia Clinica e Ipertensione, IRCCS Ospedale Maggiore, Milano (B.M.C., A.L., G.G., G.M.), and Centro Auxologico Italiano (G.S., G.M.), Milano, Italy.
Abstract—Studies performed in experimental animals and in humans have documented that high blood pressure markedly impairs baroreceptor control of heart rate. Whether a similar impairment also characterizes baroreceptor control of sympathetic activity modulating peripheral vasomotor tone is still unknown. In 28 untreated essential hypertensive subjects [14 of moderate and 14 of more severe degree, age 51.6±2.4 and 52.6±2.1 years (mean±SEM)] and in 13 untreated secondary hypertensives (renovascular or pheochromocytoma, age 50.1±4.6 years), we measured beat-to-beat arterial blood pressure (finger photoplethysmographic device), heart rate (electrocardiogram), and efferent postganglionic muscle sympathetic nerve activity (microneurography) at rest and during baroreceptor stimulation and deactivation induced by stepwise intravenous infusions of phenylephrine and nitroprusside, respectively. Data were compared with those obtained in 15 age-matched normotensive control subjects. Muscle sympathetic nerve activity (bursts per 100 heart beats) showed a progressive and significant (P<.01) increase from normotension (40.3±3.3) to moderate (55.6±4.1) and more severe essential hypertension (68.2±4.1), paralleling the progressive increase in blood pressure values. In contrast, muscle sympathetic nerve activity was not increased in secondary hypertensives (40.5±6.7) despite blood pressure values similar to or even greater than those of severe essential hypertensives. In both essential and secondary hypertensives, baroreceptor–heart rate control was displaced toward elevated blood pressure values and markedly impaired compared with normotensive subjects (average reduction, 38.5%). In contrast, the sympathoinhibitory and sympathoexcitatory responses to baroreceptor stimulation and deactivation were displaced toward elevated blood pressure values but similar in all groups. Thus, sympathetic activation characterizes essential but not secondary hypertension. Regardless of its nature, however, hypertension is not accompanied by an impairment of baroreceptor modulation of sympathetic activity.
Key Words: sympathetic nervous system • autonomic nervous system • baroreceptors • hypertension, essential
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