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Am J Physiol Heart Circ Physiol 280: H844-H850, 2001;
0363-6135/01 $5.00
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Vol. 280, Issue 2, H844-H850, February 2001

Cardiac sympathetic overactivity and decreased baroreflex sensitivity in L-NAME hypertensive rats

Hugo C. D. Souza1, Gustavo Ballejo2, Maria Cristina O. Salgado2, Valdo J. Dias Da Silva3, and Helio C. Salgado1

Departments of 1 Physiology and 2 Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, 14049-900 Ribeirão Preto, São Paulo; and 3 Department of Biological Science, School of Medicine of Triângulo Mineiro, 38015-050 Uberaba, Minas Gerais, Brazil

The present study evaluated the possible changes in the autonomic control of heart rate in the hypertensive model induced by the inhibition of nitric oxide synthase. Rats were treated with NG-nitro-L-arginine methyl ester (L-NAME group) in the drinking water during 7 days, whereas control groups were treated with tap water (control group) or with the NG-nitro-D-arginine methyl ester (D-NAME group), an inactive isomer of the L-NAME molecule. The L-NAME group developed hypertension and tachycardia. The sequential blockade of the autonomic influences with propranolol and methylatropine indicated that the intrinsic heart rate did not differ among groups and revealed a sympathetic overactivity in the control of heart rate in the L-NAME group. The spectral density power of heart rate, calculated using fast-Fourier transformation, indicated a reduced variability in the low-frequency band (0.20-0.60 Hz) for the L-NAME group. The baroreflex sensitivity was also attenuated in these animals when compared with the normotensive control or D-NAME group. Overall, these data indicate cardiac sympathetic overactivity associated with a decreased baroreflex sensitivity in L-NAME hypertensive rats.

nitric oxide; heart rate variability


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