Aortic blood flow subtraction: an alternative method for measuring total renal blood flow in conscious dogs.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Aortic blood flow subtraction: an alternative method for measuring total renal blood flow in conscious dogs. / Sandgaard, N C F; Andersen, J L; Holstein-Rathlou, N-H; Bie, P.
I: American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, Bind 282, Nr. 5, 2002, s. R1528-35.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Aortic blood flow subtraction: an alternative method for measuring total renal blood flow in conscious dogs.
AU - Sandgaard, N C F
AU - Andersen, J L
AU - Holstein-Rathlou, N-H
AU - Bie, P
N1 - Keywords: Angiotensin II; Animals; Antihypertensive Agents; Aorta, Abdominal; Arterial Occlusive Diseases; Benzimidazoles; Blood Flow Velocity; Blood Pressure; Carotid Arteries; Dogs; Endothelin-1; Female; Homeostasis; Regional Blood Flow; Renal Artery; Renal Circulation; Reproducibility of Results; Rheology; Subtraction Technique; Tetrazoles; Vascular Resistance; Vasoconstrictor Agents
PY - 2002
Y1 - 2002
N2 - We have measured total renal blood flow (TRBF) as the difference between signals from ultrasound flow probes implanted around the aorta above and below the renal arteries. The repeatability of the method was investigated by repeated, continuous infusions of angiotensin II and endothelin-1 seven times over 8 wk in the same dog. Angiotensin II decreased TRBF (350 +/- 16 to 299 +/- 15 ml/min), an effect completely blocked by candesartan (TRBF 377 +/- 17 ml/min). Subsequent endothelin-1 infusion reduced TRBF to 268 +/- 20 ml/min. Bilateral carotid occlusion (8 sessions in 3 dogs) increased arterial blood pressure by 49% and decreased TRBF by 12%, providing an increase in renal vascular resistance of 69%. Dynamic analysis showed autoregulation of renal blood flow in the frequency range <0.06-0.07 Hz, with a peak in the transfer function at 0.03 Hz. It is concluded that continuous measurement of TRBF by aortic blood flow subtraction is a practical and reliable method that allows direct comparison of excretory function and renal blood flow from two kidneys. The method also allows direct comparison between TRBF and flow in the caudal aorta.
AB - We have measured total renal blood flow (TRBF) as the difference between signals from ultrasound flow probes implanted around the aorta above and below the renal arteries. The repeatability of the method was investigated by repeated, continuous infusions of angiotensin II and endothelin-1 seven times over 8 wk in the same dog. Angiotensin II decreased TRBF (350 +/- 16 to 299 +/- 15 ml/min), an effect completely blocked by candesartan (TRBF 377 +/- 17 ml/min). Subsequent endothelin-1 infusion reduced TRBF to 268 +/- 20 ml/min. Bilateral carotid occlusion (8 sessions in 3 dogs) increased arterial blood pressure by 49% and decreased TRBF by 12%, providing an increase in renal vascular resistance of 69%. Dynamic analysis showed autoregulation of renal blood flow in the frequency range <0.06-0.07 Hz, with a peak in the transfer function at 0.03 Hz. It is concluded that continuous measurement of TRBF by aortic blood flow subtraction is a practical and reliable method that allows direct comparison of excretory function and renal blood flow from two kidneys. The method also allows direct comparison between TRBF and flow in the caudal aorta.
U2 - 10.1152/ajpregu.00494.2001
DO - 10.1152/ajpregu.00494.2001
M3 - Journal article
C2 - 11959697
VL - 282
SP - R1528-35
JO - American Journal of Physiology
JF - American Journal of Physiology
SN - 0363-6119
IS - 5
ER -
ID: 8420401