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- W39386071 abstract "Since myogenic vasoconstriction in isolated arteries is slower than norepinephrine-induced vasoconstriction, we hypothesized that myogenic vascular function affects lower frequency components of blood pressure variability (BPV) than sympathetic modulation of vascular tone in rats and dogs. In conscious normotensive Wistar Kyoto rats (NT-WKY, n=8) and conscious dogs (n=6), BPV was studied during control conditions, inhibition of myogenic function (i.v. infusion of nifedipine), and hypotension induced by sodium nitroprusside (Na-NP). In dogs, the gain of the transfer function between mean blood pressure and total peripheral resistance, a measure of how much vascular resistance changes for a given change in pressure, was determined as an index of myogenic vascular function. Inhibition of myogenic vascular function, but not Na-NP-induced hypotension, significantly reduced VLF BPV (rats: 0.02–0.2 Hz; dogs: 0.01–0.07 Hz) in conscious rats (control: 3.6±1.1 mmHg2; Na-NP: 5.3±1.0 mmHg2 n.s. vs. control; nifedipine: 1.4±0.3 mmHg2 p<0.05 vs. control) and dogs (control: 38.1±9.3 mmHg2; Na-NP: 24.1±5.4 mmHg2 n.s. vs. control; nifedipine: 13.1±4.5 mmHg2 p<0.05 vs. control). In dogs, the normalized gain of the transfer function was high (>1) during control conditions exclusively in the VLF band and decreased to values <1 by nifedipine, but not by Na-NP. In conclusion, myogenic vascular function affects VLF BPV in conscious rats and dogs. Supported by: NIH HL46314 and AHA #0630329N" @default.
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- W39386071 date "2007-01-01" @default.
- W39386071 modified "2023-09-27" @default.
- W39386071 title "Myogenic vascular function affects very low frequency blood pressure variability in conscious rats and dogs" @default.
- W39386071 doi "https://doi.org/10.1096/fasebj.21.6.a877-b" @default.
- W39386071 hasPublicationYear "2007" @default.
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