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An improved strategy for evaluating the extent of chronic arterial baroreceptor denervation in conscious rats BJMBR
Rodríguez-Martínez,M.; Torres-Rodríguez,M.L.; Brito-Orta,M.D.; López-Rodriguez,J.F.; Rodríguez-Pérez,A.S.; Calvo-Turrubiartes,M.Z.; Llamazares-Azuara,L..
There is no index or criterion of aortic barodenervation, nor can we differentiate among rats that have suffered chronic sham, aortic or sino-aortic denervation. The objective of this study was to develop a procedure to generate at least one quantitative, reproducible and validated index that precisely evaluates the extent of chronic arterial barodenervation performed in conscious rats. Data from 79 conscious male Wistar rats of about 65-70 days of age with diverse extents of chronic arterial barodenervation and used in previous experiments were reanalyzed. The mean arterial pressure (MAP) and the heart rate (HR) of all rats were measured systematically before (over 1 h) and after three consecutive iv bolus injections of phenylephrine (PHE) and sodium...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aortic denervation; Sinoaortic denervation; Effectiveness of barodenervation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001100008
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Baroreflex control of sympathetic activity in experimental hypertension BJMBR
Irigoyen,M.C.C.; Krieger,E.M..
The arterial baroreceptor reflex system is one of the most powerful and rapidly acting mechanisms for controlling arterial pressure. The purpose of the present review is to discuss data relating sympathetic activity to the baroreflex control of arterial pressure in two different experimental models: neurogenic hypertension by sinoaortic denervation (SAD) and high-renin hypertension by total aortic ligation between the renal arteries in the rat. SAD depresses baroreflex regulation of renal sympathetic activity in both the acute and chronic phases. However, increased sympathetic activity (100%) was found only in the acute phase of sinoaortic denervation. In the chronic phase of SAD average discharge normalized but the pattern of discharges was different from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Baroreflex; Sympathetic activity; Sinoaortic denervation; High-renin hypertension.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000900015
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Evidence that blood pressure remains under the control of arterial baroreceptors in renal hypertensive rats BJMBR
Trindade Jr.,A.S.; Moreira,E.D.; Silva,G.J.J.; Krieger,E.M..
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 normotensive control and in chronic (2 months) 1-kidney, 1-clip hypertensive rats. The fall in blood pressure produced by electrical baroreceptor stimulation was greater in renal hypertensive rats than in normotensive controls (right nerve: -47 ± 8 vs -23 ± 4 mmHg; left nerve: -51 ± 7 vs -30 ± 4 mmHg; and both right and left nerves: -50 ± 8 vs -30 ± 4 mmHg; P < 0.05). Furthermore, the increase in...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Arterial baroreceptor; Renal hypertension; Sinoaortic denervation; Aortic depressor nerve; Electrical stimul.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001000013
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Hemodynamic responses to acute aortic coarctation in conscious sinoaortic denervated rats BJMBR
Fazan Jr.,R.; Machado,B.H.; Salgado,H.C..
The hemodynamic responses to acute (45 min) partial aortic constriction were studied in conscious intact (N = 7) or sinoaortic denervated (SAD) adult male Wistar rats (280-350 g, N = 7) implanted with carotid and femoral arterial catheters, a pneumatic cuff around the abdominal aorta and a pulsed Doppler flow probe to measure changes in aortic resistance. In addition, the hypertensive response and the reflex bradycardia elicited by total (N = 8) vs partial (N = 7) aortic constriction (monitored by maintenance of the pressure distal to the cuff at 50 mmHg) were compared in two other groups of intact rats. Intact rats presented a smaller hypertensive response (26 to 40% above basal level) to partial aortic constriction than SAD rats (38 to 58%). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hypertension; Aortic coarctation; Doppler flowmetry; Aortic resistance; Reflex bradycardia; Sinoaortic denervation.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001000018
Registros recuperados: 4
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