Key result
In conscious rats, intrinsic heart rate was increased by 1K1C renal hypertension but decreased by sinoaortic deafferentation or nucleus ambiguus lesion, suggesting strong influence by autonomic tone.
Population
Conscious rats
Comparison
Sinoaortic deafferentation, lesion of nucleus… vs Control/baseline state or renal hypertension alone
Design
Preclinical
Follow-up
Up to 7 days
Authors
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Autonomic tone shapes intrinsic heart rate in hypertensive rats; extends mechanistic insights but leaves open human relevance.
Intrinsic heart rate is heavily influenced by autonomic tone, and tachycardia in renal hypertension depends on baroreflex integrity.
Machado et al. (1989) studied this question. Sinoaortic deafferentation, nucleus ambiguus lesion, and 1K1C renal hypertension was evaluated on Intrinsic heart rate (IHR), mean arterial pressure (MAP), and heart rate (HR). In conscious rats, intrinsic heart rate was increased by 1K1C renal hypertension but decreased by sinoaortic deafferentation or nucleus ambiguus lesion, suggesting strong influence by autonomic tone.
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