What question did this study set out to answer?

To determine whether clonidine lowers blood pressure through a generalized inhibition of peripheral sympathetic nervous system activity in humans.

May 1, 1981Hypertension

The antihypertensive mechanism of clonidine in man. Evidence against a generalized reduction of sympathetic activity.

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Why the study?

Does intravenous clonidine reduce sympathetic activity in hypertensive patients?

Population

7 hypertensive patients

Design

Case_series

Authors

BWB. Gunnar WallinPreventive Cardiology MFMarianne Frisk‐HolmbergUniversité Claude Bernard Lyon 1

Discussion

Member takes

Implication

Clonidine may lower BP without consistent sympathetic suppression; leaves open dose-dependent central-peripheral mechanisms.

Key Points

To determine whether clonidine lowers blood pressure through a generalized inhibition of peripheral sympathetic nervous system activity in humans.
Administered intravenous bolus injections of 100 to 275 µg clonidine in hypertensive patients (N=7).
Recorded multi-unit sympathetic activity directly from muscle branches of the peroneal nerve alongside continuous blood pressure and heart rate monitoring.
Blood pressure decreased in all 7 patients, whereas sympathetic activity and heart rate showed bidirectional responses, either increasing or decreasing.
Sympathetic nerve activity tended to increase when plasma clonidine concentrations were low and decrease when plasma concentrations were high.
Dynamic baroreflex modulation of sympathetic outflow persisted in response to transient blood pressure fluctuations regardless of whether mean sympathetic activity increased or decreased.

Structured PICO

Does intravenous clonidine reduce sympathetic activity in hypertensive patients?

Population

7 hypertensive patients

Intervention

Clonidine 100 to 275 micrograms via i.v. bolus injection

Outcome

Blood pressure, heart rate, and multi-unit sympathetic activity from muscle branches of the peroneal nervesurrogate

Clonidine lowers blood pressure in hypertensive patients through a combination of central and peripheral effects, rather than a generalized reduction in sympathetic activity.

Cite This Study

Wallin et al. (1981) studied this question.

synapsesocial.com/papers/6a70810c8031ec7bb1dc63b1 https://doi.org/10.1161/01.hyp.3.3.340

Topics

Hypertension management

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The antihypertensive mechanism of clonidine in man. Evidence against a generalized reduction of sympathetic activity.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Topics

The antihypertensive mechanism of clonidine in man. Evidence against a generalized reduction of sympathetic activity.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Topics

Also Consider