Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Journal of the Renin-Angiotensin-Aldosterone System |
| Vol/bind | 2 |
| Udgave nummer | 3 |
| Sider (fra-til) | 188-92 |
| Antal sider | 4 |
| ISSN | 1470-3203 |
| DOI | |
| Status | Udgivet - 2001 |
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I: Journal of the Renin-Angiotensin-Aldosterone System, Bind 2, Nr. 3, 2001, s. 188-92.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - No effect of angiotensin II AT(2)-receptor antagonist PD 123319 on cerebral blood flow autoregulation
AU - Estrup, T M
AU - Paulson, O B
AU - Strandgaard, S
PY - 2001
Y1 - 2001
N2 - Blockade of the renin-angiotensin system with angiotensin-converting enzyme inhibitors (ACE-I) or angiotensin AT1-receptor antagonists shift the limits of autoregulation of cerebral blood flow (CBF) towards lower blood pressure (BP). The role of AT2-receptors in the regulation of the cerebral circulation is uncertain. Hence, the present study investigated the effect on CBF autoregulation of blocking of angiotensin AT2-receptors with PD 123319 in spontaneously hypertensive rats (SHR). Anaesthetised and ventilated SHR were given PD 123319, 0.36 mg/kg/min, intravenously, and compared with a control group. CBF was measured by the intracarotid 133xenon injection method and BP was raised by noradrenaline infusion and lowered by controlled haemorrhage in separate groups of rats. The limits of autoregulation were determined by computed least-sum-of-squares analysis. PD 123319 did not influence baseline CBF, but resulted in a minor BP decrease (10 control and 10 treated rats). The lower limit of CBF autoregulation (eight treated and eight control) as well as the upper limit of CBF autoregulation (eight treated and eight control) were not significantly different in PD 123319 and control animals (lower limit treated 102+/-4 mmHg and control 94+/-4; NS, and upper limit treated 171 +/- 10 mmHg and control 162+/-7; NS). These findings indicate that acute AT2-receptor blockade does not influence CBF autoregularion.
AB - Blockade of the renin-angiotensin system with angiotensin-converting enzyme inhibitors (ACE-I) or angiotensin AT1-receptor antagonists shift the limits of autoregulation of cerebral blood flow (CBF) towards lower blood pressure (BP). The role of AT2-receptors in the regulation of the cerebral circulation is uncertain. Hence, the present study investigated the effect on CBF autoregulation of blocking of angiotensin AT2-receptors with PD 123319 in spontaneously hypertensive rats (SHR). Anaesthetised and ventilated SHR were given PD 123319, 0.36 mg/kg/min, intravenously, and compared with a control group. CBF was measured by the intracarotid 133xenon injection method and BP was raised by noradrenaline infusion and lowered by controlled haemorrhage in separate groups of rats. The limits of autoregulation were determined by computed least-sum-of-squares analysis. PD 123319 did not influence baseline CBF, but resulted in a minor BP decrease (10 control and 10 treated rats). The lower limit of CBF autoregulation (eight treated and eight control) as well as the upper limit of CBF autoregulation (eight treated and eight control) were not significantly different in PD 123319 and control animals (lower limit treated 102+/-4 mmHg and control 94+/-4; NS, and upper limit treated 171 +/- 10 mmHg and control 162+/-7; NS). These findings indicate that acute AT2-receptor blockade does not influence CBF autoregularion.
U2 - 10.3317/jraas.2001.026
DO - 10.3317/jraas.2001.026
M3 - Journal article
SN - 1470-3203
VL - 2
SP - 188
EP - 192
JO - Journal of the Renin-Angiotensin-Aldosterone System
JF - Journal of the Renin-Angiotensin-Aldosterone System
IS - 3
ER -