Key result
Rat renal blood flow analysis detects a single macula densa feedback mechanism below 0.25 Hz.
Why the study?
The study was motivated by the suggestion that renal autoregulation had one fast and one slow component, which required testing by frequency response analysis.
Population
Rats including acutely hypertensive models
Comparison
Periodic arterial pressure variation by pump vs aperiodic variation by atrial fibrillation stimulation
Design
Preclinical experimental study with frequency response analysis
Authors
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Hypothesis-generating in rats; leaves open whether macula densa feedback is the sole renal autoregulatory mechanism in humans.
In a rat model, frequency domain analysis indicates that macula densa feedback is the sole detectable flow-regulating mechanism for renal autoregulation.
Sakai et al. (1986) studied Renal autoregulation. Variation of arterial pressure was evaluated on Frequency response of renal blood flow. Frequency domain analysis of renal blood flow in rats detected only one flow-regulating mechanism, consistent with macula densa feedback, appearing as a phase shift at frequencies of 0.25 Hz and below.
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