Aortic Depressor Nerve
Mostrando 1-12 de 13 artigos, teses e dissertações.
-
1. Time course of the hemodynamic responses to aortic depressor nerve stimulation in conscious spontaneously hypertensive rats
The time to reach the maximum response of arterial pressure, heart rate and vascular resistance (hindquarter and mesenteric) was measured in conscious male spontaneously hypertensive (SHR) and normotensive control rats (NCR; Wistar; 18-22 weeks) subjected to electrical stimulation of the aortic depressor nerve (ADN) under thiopental anesthesia. The parameter
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-05
-
2. Evidence that blood pressure remains under the control of arterial baroreceptors in renal hypertensive rats
The purpose of the present study was to determine the range of the influence of the baroreflex on blood pressure in chronic renal hypertensive rats. Supramaximal electrical stimulation of the aortic depressor nerve and section of the baroreceptor nerves (sinoaortic denervation) were used to obtain a global analysis of the baroreceptor-sympathetic reflex in n
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-10
-
3. Acute and chronic electrical activation of baroreceptor afferents in awake and anesthetized subjects
Electrical stimulation of baroreceptor afferents was used in the 1960's in several species, including human beings, for the treatment of refractory hypertension. This approach bypasses the site of baroreceptor mechanosensory transduction. Chronic electrical stimulation of arterial baroreceptors, particularly of the carotid sinus nerve (Hering's nerve), was p
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-01
-
4. Integrated Cardio-Respiratory Mechanisms within the brainstem: Involvement of the Caudal Pressor Area, the Nucleus of the Solitary Tract and the Retrotrapezopid Nucleus. / Mecanismos Cardio-Respiratórios Integrados na Região Bulbar: Participação da Área Pressora Caudal, dos Núcleos do Trato Solitário e do Núcleo Retrotrapezóide.
Cardiovascular responses are integrated at different levels of the central nervous system (CNS). In the brainstem, there are different areas related to the cardiovascular control. It is well known that in the ventrolateral medulla there are, at least, three important regions involved with cardiovascular control: the rostral ventrolateral medulla (RVLM), the
Publicado em: 2009
-
5. Does acute hyperglycemia alter rat aortic depressor nerve function?
Because it is not known where in the reflex arch, i.e., afference, central nervous system or efferences, hyperglycemia affects baroreflex function, the present study examined the effect of short-term (30 min) hyperglycemia on aortic depressor nerve function measured by a mean arterial pressure vs aortic depressor nerve activity curve, fitted by sigmoidal reg
Brazilian Journal of Medical and Biological Research. Publicado em: 2007-11
-
6. Reflex control of arterial pressure and heart rate in short-term streptozotocin diabetic rats
Impaired baroreflex sensitivity in diabetes is well described and has been attributed to autonomic diabetic neuropathy. In the present study conducted on acute (10-20 days) streptozotocin (STZ)-induced diabetic rats we examined: 1) cardiac baroreflex sensitivity, assessed by the slope of the linear regression between phenylephrine- or sodium nitroprusside-in
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-07
-
7. Interactions between angiotensin II, aortic and sympathetic nerve during development of coarctation hypertension. / Interações entre angiotensina II, atividade do nervo depressor aórtico e atividade simpática esplâncnina durante o desenvolvimento da hipertensão por coarctação.
In the chronic phase of coarctation hypertension (CH) we have shown both marked depression of baroreceptor reflex control of heart rate (Michelini et al, Hypertension, 1992, 19: II159-II163) and normalization of the depressed reflex control even with the persistence of hypertension in losartan-treated animals (Santos et al, Am. J. Physiol, 1995, 269: H812-H8
Publicado em: 1999
-
8. Baroreceptor-vasomotor reflex after N-methyl-D-aspartate receptor blockade in rabbit caudal ventrolateral medulla.
1. Experiments were performed in anaesthetized rabbits to determine whether blockade of N-methyl-D-aspartate receptors in the caudal ventrolateral medulla oblongata prevents the changes in renal sympathetic vasomotor activity which normally occur in response to increases or decreases in arterial pressure. 2. N-Methyl-D-aspartic acid receptor blockade using b
-
9. Restoration of hypoxic respiratory responses in the awake rat after carotid body denervation by sinus nerve section.
The restoration of ventilatory responses to hypoxia after carotid body denervation was studied in twenty-eight awake rats. The respiratory depression seen in moderate hypoxia (partial pressure of inspired O2, PI,O2, 80-100 mmHg) 3 days after bilateral carotid sinus nerve section disappeared by day 10. By day 17 respiratory stimulation occurred at all levels
-
10. Baroreflex impairment precedes hypertension during chronic cerebroventricular infusion of hypertonic sodium chloride in rats.
Osmotic minipumps were implanted chronically for continuous 11-d infusion of hypertonic sodium chloride (NaCl) into the third cerebral ventricle (ICV) of awake rats to determine whether baroreflex sensitivity would be altered. Systolic and mean pressures, recorded from aortic catheters on day 11 while the rats were anesthetized with alpha-chloralose, were si
-
11. Facilitation of the arterial baroreflex by the ventrolateral part of the midbrain periaqueductal grey matter in rats.
1. The effects of stimulation of the ventrolateral part of the midbrain periaqueductal grey matter (PAG) on the arterial baroreflex were investigated in urethane-chloralose anaesthetized and artificially ventilated rats. 2. Both electrical and chemical stimulation of the ventrolateral PAG provoked hypotension, vagal bradycardia and marked facilitation of bar
-
12. Facilitation of the arterial baroreflex by the preoptic area in anaesthetized rats.
1. Activation of cell bodies in the ventrolateral part of the midbrain periaqueductal grey matter (PAG) facilitates the arterial baroreflex via the nucleus raphe magnus. The facilitatory effects of stimulation within the hypothalamus on the arterial baroreflex and their relation to the PAG and nucleus raphe magnus were studied in urethane- and chloralose-ana