Key result
In spontaneously hypertensive rats, sympathectomy increased low-frequency blood pressure power, indicating that no spectral power specifically reflects the effects of either autonomic limb.
Why the study?
Does chemical sympathectomy and autonomic blockade alter cardiovascular spectral powers in unanesthetized spontaneously hypertensive rats?
Population
12-week-old unanesthetized, free-moving spontaneously hypertensive rats (SHR)
Comparison
Chemical sympathectomy via repeated injections… vs Control rats given vehicle alone
Design
Preclinical
Follow-up
90 min recording sessions
Authors
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Challenges spectral power interpretations in hypertensive models; leaves open their validity for autonomic assessment in humans.
Does chemical sympathectomy and autonomic blockade alter cardiovascular spectral powers in unanesthetized spontaneously hypertensive rats?
In spontaneously hypertensive rats, no specific spectral power of blood pressure or pulse interval can specifically reflect the effects of either sympathetic or parasympathetic autonomic limbs.
Ferrari et al. (1995) studied Spontaneously hypertensive rats. Chemical sympathectomy (6-hydroxydopamine) vs. Vehicle alone was evaluated on Spectral powers of blood pressure and pulse interval. In spontaneously hypertensive rats, sympathectomy increased low-frequency blood pressure power, indicating that no spectral power specifically reflects the effects of either autonomic limb.
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