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Am J Physiol Heart Circ Physiol 274: H358-H365, 1998;
0363-6135/98 $5.00
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Vol. 274, Issue 1, H358-H365, January 1998

Dynamic transduction properties of in situ baroreceptors of rabbit aortic depressor nerve

Takayuki Sato1, Toru Kawada1, Toshiaki Shishido1, Hiroshi Miyano1, Masashi Inagaki1, Hiroshi Miyashita1, Masaru Sugimachi1, Mark M. Knuepfer2, and Kenji Sunagawa1

1 Department of Cardiovascular Dynamics, National Cardiovascular Center Research Institute, Suita, Osaka 565, Japan; and 2 Department of Pharmacological and Physiological Science, St. Louis University School of Medicine, St. Louis, Missouri 63104

We developed a new method for isolating in situ baroreceptor regions of the rabbit aortic depressor nerve (ADN) and estimated the transfer function from pressure to afferent nerve activity in the frequency range of 0.01-5 Hz by a white noise technique. Complete isolation of the baroreceptor area of the right ADN was made in situ by ligation of the innominate artery and the right subclavian and common carotid arteries. We altered the pressure in the isolated baroreceptor area according to a binary quasi-white noise between 80 and 100 mmHg in 12 urethan-anesthetized rabbits. The gain increased two to three times as the frequency of pressure perturbation increased from 0.01 to 2 Hz and then decreased at higher frequencies. The phase slightly led below 0.2 Hz. The squared coherence value was >0.8 in the frequency range of 0.01-4 Hz. The step responses estimated from the transfer function were indistinguishable from those actually observed. We conclude that the baroreceptor transduction of the ADN is governed by linear dynamics under the physiological operating pressure range.

in situ isolation; white noise technique


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