Key result
High-voltage, high-frequency peripheral nerve stimulation increases BP up to ~65 mm Hg, unlike other parameters.
Why the study?
The relationship between frequency and intensity of peripheral nerve stimulation and their effects on blood pressure and respiratory responses in cats was unclear.
Does peripheral nerve stimulation frequency and intensity alter blood pressure and respiratory responses in cats?
Does peripheral nerve stimulation frequency and intensity alter blood pressure and respiratory responses in cats?
The study demonstrates that the direction of blood pressure and respiratory responses to peripheral nerve stimulation depends on the interplay between stimulation frequency and intensity, challenging the anatomical specificity of pressor and depressor afferents.
Answers are grounded in this paper and cite their sources.
Stimulation parameters dictate BP direction in cats; challenges afferent specificity assumptions and leaves open human neuromodulation applicability.
Experiments on cats anesthetized with pentobarbital sodium indicate that a change in the frequency of peripheral nerve stimulation will alter the direction of the blood pressure and respiratory response only after a certain intensity of stimulation is attained. Low voltage-high frequency (1–3 v, 60/sec), high voltage-low frequency (15 v, 10/sec) and low voltage-low frequency stimulation of the tibial and/or peroneal nerves initially produces a decrease in blood pressure (20–50 mm Hg) and a decrease in respiratory minute volume (13–92%). However, high voltage-high frequency stimulation generally produces an increase in blood pressure of 10–65 mm Hg and an 8–14% increase in minute volume. In decerebrate cats, low-voltage, high-frequency as well as high-voltage, high-frequency stimulation of the tibial nerve results in an increase in blood pressure, minute volume, and/or rate and amplitude of phrenic nerve discharge. Frequency and intensity are therefore interrelated. Anatomical specificity of limb peripheral nerve fibers into pressor and depressor afferents is not substantiated.
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Katz et al. (1965) studied this question. Peripheral nerve stimulation (tibial and/or peroneal nerves) was evaluated on Blood pressure and respiratory minute volume. High voltage-high frequency stimulation of peripheral nerves generally increased blood pressure by 10-65 mm Hg and minute volume by 8-14%, whereas other stimulation parameters decreased them.
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