(Hypertension. 1998;31:64.)
© 1998 American Heart Association, Inc.
Scientific Contributions |
Dissociation Between Muscle and Skin Sympathetic Nerve Activity in Essential Hypertension, Obesity, and Congestive Heart Failure
From the Cattedra di Medicina Interna, Ospedale S.Gerardo Monza, Università di Milano (G.G., M.C., G.M.), Centro di Fisiologia Clinica e Ipertensione, IRCCS, Ospedale Maggiore, Milano (G.G., G.M.), Divisione di Cardiologia, Ospedale di Legnano, Milano (D.S.), and Istituto Auxologico Italiano, IRCCS, Milano (G.S., G.M.), Italy.
Abstract—Essential hypertension, obesity, and congestive heart failure are characterized by an increase in muscle sympathetic nerve activity. Whether in these conditions skin sympathetic nerve activity is also increased has never been systematically examined, however. In 10 untreated mild essential hypertensive, 12 untreated normotensive obese, 10 mild (New York Heart Association class II) heart failure, and 10 normotensive lean healthy control subjects, we measured beat-to-beat arterial blood pressure (Finapres technique), body mass index, and postganglionic sympathetic nerve activity in skeletal muscle and skin areas (microneurographic technique, peroneal nerve). The muscle and skin nerve measurements were made in a randomized sequence. All data were obtained with the subject supine in a quiet, semidark environment at constant temperature over two periods of 30 minutes each, separated by a 20- to 30-minute interval. Blood pressure was increased only in hypertensive and body mass index only in obese subjects. Muscle sympathetic nerve activity quantified as bursts/min was markedly and significantly (P<.01) greater in essential hypertensive (33.3±1.7), obese (42.2±2.8), and congestive heart failure subjects (55.8±4.3) in comparison with control subjects (23.9±1.6). This was the case also for muscle sympathetic nerve activity, quantified as bursts per 100 heart beats. In contrast, skin sympathetic nerve activity (bursts per minute) was superimposable in hypertensive, obese, heart failure, and control subjects, its ability to increase being documented in all four groups by the marked response to an acoustic stimulus. Thus, in various diseases, muscle but not skin sympathetic activity is increased, with the sympathetic activation not being uniformly distributed over the whole cardiovascular system.
Key Words: hypertension, essential • obesity • heart failure • sympathetic nervous system • reflex
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