What question did this study set out to answer?

To evaluate whether isolated large conduit arteries from hypertensive rat models display enhanced or diminished contractile responses to vasoconstrictor stimuli in vitro.

January 1, 2013The Chinese Journal of Physiology

Diminished Contractile Responses of Isolated Conduit Arteries in Two Rat Models of Hypertension

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Population

Ring arterial segments isolated from spontaneously hypertensive rats, N-nitro-L-arginine methyl…

Comparison

In vitro exposure to vasoconstrictor stimuli vs Arterial segments from untreated Wistar rats

Design

Preclinical

Authors

AZAnna ZemančíkováSlovak Academy of Sciences JTJ TörökSlovak Academy of Sciences

Discussion

Member takes

Implication

Altered rat aortic reactivity warrants caution against clinical extrapolation; leaves open relevance to human conduit artery responses in hypertension.

Key Points

To evaluate whether isolated large conduit arteries from hypertensive rat models display enhanced or diminished contractile responses to vasoconstrictor stimuli in vitro.
Measured isometric contractile responses of isolated arterial rings from thoracic aortas and superior mesenteric arteries.
Tested vascular rings from spontaneously hypertensive rats, L-NAME-treated Wistar rats, and untreated normotensive Wistar controls following exposure to noradrenaline and 100 mM potassium chloride.
Thoracic aortas from both spontaneously hypertensive and L-NAME-treated rats showed higher sensitivity but diminished maximal developed tension to noradrenaline compared with normotensive controls.
Superior mesenteric arteries maintained comparable noradrenaline sensitivity across groups, but vessels from L-NAME-treated rats displayed decreased active force when stimulated with high noradrenaline concentrations or 100 mM potassium chloride.

Structured PICO

Population

Ring arterial segments (thoracic aortas and superior mesenteric arteries) isolated from spontaneously hypertensive rats, N(omega)-nitro-L-arginine methyl ester (L-NAME)-treated Wistar rats, and untreated Wistar rats

Intervention

In vitro exposure to vasoconstrictor stimuli (noradrenaline and 100 mM KCl)

Comparator

Arterial segments from untreated Wistar rats (normotensive control)

Outcome

Mechanical responses (sensitivity and maximal developed tension) to vasoconstrictor stimuli under isometric conditionssurrogate

Hypertension leads to specific biomechanical alterations in diverse arterial types, resulting in diminished maximal contractile responses in isolated conduit arteries rather than enhanced contractions.

Cite This Study

Zemančíková et al. (2013) studied this question.

synapsesocial.com/papers/6a7f0297366dd125a6c30cd3 https://doi.org/10.4077/cjp.2013.bab128

Topics

Hypertension management

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Implication

Altered rat aortic reactivity warrants caution against clinical extrapolation; leaves open relevance to human conduit artery responses in hypertension.

Diminished Contractile Responses of Isolated Conduit Arteries in Two Rat Models of Hypertension

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Topics

Diminished Contractile Responses of Isolated Conduit Arteries in Two Rat Models of Hypertension

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Topics

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