What is the clinical evidence from this study?

Population: Genetic hypertension. Intervention: Isoprenaline vs. Normotensive Wistar-Kyoto (WKY) rats. Primary outcome: Decrease in baseline mean arterial pressure (MAP) (p=<0.01).

June 16, 2014Physiological ResearchOpen Access

Involvement of BKCa and KV Potassium Channels in cAMP-Induced Vasodilatation: Their Insufficient Function in Genetic Hypertension

Q: What are the key findings of this study?

Isoprenaline-induced cAMP overproduction caused a significantly greater decrease in baseline mean arterial pressure in spontaneously hypertensive rats (-54 mm Hg) compared to normotensive rats (-9 mm Hg).

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Key result

Isoprenaline-induced cAMP overproduction causes a ~6-fold greater MAP drop in hypertensive versus normotensive rats.

P<0.01

Why the study?

Does K+ channel function contribute to abnormal cAMP-induced vasodilatation in genetic hypertension?

Population

Conscious spontaneously hypertensive rats (SHR) and normotensive WKY rats

Comparison

Infusion of beta-adrenoceptor agonist to induce… vs Normotensive WKY rats and baseline conditions

Design

Preclinical

Authors

MPMária PintérováCzech Academy of Sciences MBMichal BehuliakCzech Academy of Sciences JKJaroslav KunešCzech Academy of Sciences

Discussion

Member takes

Implication

Demands caution extrapolating rodent cAMP vasodilation to human hypertension; leaves open K+ channel contributions.

Structured PICO

Does K+ channel function contribute to abnormal cAMP-induced vasodilatation in genetic hypertension?

Population

Conscious spontaneously hypertensive rats (SHR) and normotensive WKY rats

Intervention

Infusion of beta-adrenoceptor agonist (isoprenaline) to induce cAMP overproduction, with or without acute NO synthase blockade, and inhibition of BKCa or KV channels

Comparator

Normotensive WKY rats and baseline conditions

Outcome

Blood pressure (BP) response to isoprenaline and NO synthase blockade, and the effect of K+ channel inhibition on these responsessurrogate

Main Result

Absolute Event Rate: -54% vs -9%

p-value: p=<0.01

K+ channels have higher activity in spontaneously hypertensive rats but their vasodilator action cannot sufficiently match the augmented vasoconstriction.

Limitations

In vivo evaluation required ganglionic blockade to eliminate baroreflex influence, resulting in very low baseline blood pressure that necessitated an indirect method to evaluate vasodilator effects.

Cite This Study

Pintérová et al. (2014) studied Genetic hypertension. Isoprenaline vs. Normotensive Wistar-Kyoto (WKY) rats was evaluated on Decrease in baseline mean arterial pressure (MAP) (p=<0.01). Isoprenaline-induced cAMP overproduction caused a significantly greater decrease in baseline mean arterial pressure in spontaneously hypertensive rats (-54 mm Hg) compared to normotensive rats (-9 mm Hg).

synapsesocial.com/papers/6a0d52d0e51d8d6d0c09b094 https://doi.org/10.33549/physiolres.932718

Topics

Hypertension management

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Involvement of BKCa and KV Potassium Channels in cAMP-Induced Vasodilatation: Their Insufficient Function in Genetic Hypertension

Discussion

Member takes

Implication

Structured PICO

Main Result

Limitations

Cite This Study

Topics

Involvement of BKCa and KV Potassium Channels in cAMP-Induced Vasodilatation: Their Insufficient Function in Genetic Hypertension

Discussion

Member takes

Implication

Structured PICO

Main Result

Limitations

Cite This Study

Also Consider

Topics

Also Consider