What is the clinical evidence from this study?

Population: Hypertension. Intervention: Long-term salt loading vs. Control SHR and WKY. Primary outcome: Blood pressure and cerebrospinal fluid sodium concentration.

What question did this study set out to answer?

To investigate whether elevated cerebrospinal fluid sodium concentrations and enhanced brain renin-angiotensin system activity drive salt-induced hypertension in spontaneously hypertensive rats.

January 1, 1988Japanese Circulation Journal-english EditionOpen Access

Central and peripheral mechanisms of the enhanced hypertension following long-term salt loading in spontaneously hypertensive rats.

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Key result

Long-term salt loading (1% NaCl) in spontaneously hypertensive rats accelerated hypertension development, associated with elevated CSF sodium and enhanced brain renin-angiotensin system activity.

Why the study?

Does long-term salt loading enhance hypertension in spontaneously hypertensive rats via increased CSF sodium and brain RAS activity?

Population

Spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto rats (WKY)

Comparison

Long-term salt loading vs Control SHR and WKY without salt loading

Design

Preclinical

Follow-up

Long-term

Authors

YTYUTAKA TAKATANational Hospital Organization Kyushu Cancer Center YYYoshiaki YamashitaMie University Hospital STShuichi TakishitaKagoshima University

Discussion

Member takes

Implication

Supports central salt-RAS mechanisms in rat hypertension; hypothesis-generating and leaves open human translation.

Key Points

To investigate whether elevated cerebrospinal fluid sodium concentrations and enhanced brain renin-angiotensin system activity drive salt-induced hypertension in spontaneously hypertensive rats.
Administered long-term salt loading via 1% NaCl drinking solution to spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto (WKY) controls, including uninephrectomized groups.
Assessed cerebrospinal fluid (CSF) sodium, plasma arginine vasopressin (AVP), and plasma epinephrine concentrations.
Measured mean blood pressure changes following intravenous blockade of AVP and the sympathetic nervous system, as well as intracerebroventricular (ICV) injections of angiotensin II, NaCl, and captopril.
Chronic salt loading accelerated hypertension progression in SHR without altering blood pressure in WKY rats, and uninephrectomized SHR exhibited significantly elevated CSF sodium concentrations.
Intravenous administration of an AVP antagonist or hexamethonium produced greater blood pressure reductions in salt-loaded SHR than in controls, with the combined response correlating directly with CSF sodium levels.
The pressor action of ICV NaCl in SHR was abolished by an ICV angiotensin II antagonist, and ICV captopril induced an enhanced depressor effect specifically in salt-loaded SHR.

Structured PICO

Does long-term salt loading enhance hypertension in spontaneously hypertensive rats via increased CSF sodium and brain RAS activity?

Population

Spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto rats (WKY) subjected to long-term salt loading.

Intervention

Long-term salt loading (1% NaCl solution as drinking fluid)

Comparator

Control SHR and WKY without salt loading

Outcome

Blood pressure and cerebrospinal fluid (CSF) sodium concentrationsurrogate

Long-term salt loading in spontaneously hypertensive rats exacerbates hypertension through central mechanisms involving elevated CSF sodium and enhanced brain renin-angiotensin system activity.

Cite This Study

TAKATA et al. (1988) studied Hypertension. Long-term salt loading vs. Control SHR and WKY was evaluated on Blood pressure and cerebrospinal fluid sodium concentration. Long-term salt loading (1% NaCl) in spontaneously hypertensive rats accelerated hypertension development, associated with elevated CSF sodium and enhanced brain renin-angiotensin system activity.

synapsesocial.com/papers/6a96dd3c6b29a448da82492d https://doi.org/10.1253/jcj.52.1317

Topics

Hypertension management

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Central and peripheral mechanisms of the enhanced hypertension following long-term salt loading in spontaneously hypertensive rats.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Topics

Central and peripheral mechanisms of the enhanced hypertension following long-term salt loading in spontaneously hypertensive rats.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Topics

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