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Experiments with volume overload in SHR/Frid and WKY/Frid.

E Rohde¹, E Karasek, R Buske

¹Institute of Drug Research, GDR Academy of Sciences, Berlin.

Zeitschrift Fur Versuchstierkunde

|January 1, 1990

Summary

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This study investigated cardiovascular responses to volume overload in hypertensive (SHR) and normotensive (WKY) rats. Hypertensive rats showed altered drug responses, indicating their utility for cardiovascular drug screening.

Area of Science:

Cardiovascular Physiology
Pharmacology
Animal Models

Background:

Chronic hypertension impacts cardiovascular system function.
Volume overload is a critical stressor for the heart.
Understanding strain-specific responses is crucial for cardiovascular research.

Purpose of the Study:

To compare the cardiovascular responses to acute volume overload between spontaneously hypertensive rats (SHR) and WKY rats.
To evaluate the utility of the SHR model for screening cardiovascular drugs under combined hypertension and volume overload conditions.

Main Methods:

Continuous measurement of heart rate, blood pressure, and left ventricular pressure in SHR and WKY rats.
Determination of contractility index (dp/dtmax).
Administration of Dopamine to assess drug response.

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Main Results:

Volume overload caused a significant increase in end-diastolic left ventricular pressure in WKY rats.
SHR rats exhibited a diminished response to Dopamine compared to WKY rats.
The SHR model demonstrated a unique response profile to combined chronic hypertension and acute volume overload.

Conclusions:

The SHR model, subjected to volume overload, presents a distinct cardiovascular profile.
This model is suitable for basic circulation research and screening novel cardiovascular drugs.
High technical and preparative effort is required for this experimental model.