What question did this study set out to answer?

This research explores how beta-adrenergic stimulation affects coronary artery function in conscious dogs.

July 1, 1982Circulation Research

Regulation of large coronary arteries by beta-adrenergic mechanisms in the conscious dog.

Q: What is the clinical evidence from this study?

Study design: Other. Population: Conscious dogs (animal model). Intervention: Beta-adrenergic stimulation (Isoproterenol, Pirbuterol, Prenalterol) vs. Baseline / beta 1-adrenergic receptor blockade with atenolol. Primary outcome: Left circumflex coronary arterial diameter, blood flow, late diastolic coronary resistance (LDCR), and cross-sectional area (CSA).

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Key result

In conscious dogs, beta-adrenergic stimulation with isoproterenol increased mean coronary blood flow by 85% and cross-sectional area by 24%, indicating large coronary arteries are regulated by beta-adrenergic mechanisms.

Population

Conscious dogs

Comparison

Beta-adrenergic stimulation with isoproterenol… vs Baseline measurements and responses prior to…

Design

Preclinical

Authors

SVStephen F. VatnerHeart Failure & Transplant THThomas H. HintzeHeart Failure / Cardiomyopathy PMPilar MachoUniversity of Chile

Discussion

Member takes

Implication

Does not yet inform human coronary therapy; hypothesis-generating for beta-adrenergic regulation of large arteries.

Key Points

This research explores how beta-adrenergic stimulation affects coronary artery function in conscious dogs.
Evaluated coronary arterial diameter and blood flow in conscious dogs using isoproterenol, pirbuterol, and prenalterol.
Measured late diastolic coronary resistance (LDCR) and cross-sectional area (CSA) post-stimulation.
Conducted beta 1-adrenergic receptor blockade to analyze differential effects.
Isoproterenol decreased mean arterial pressure by 25%, increased coronary blood flow by 85% (p<0.01), and reduced LDCR by 62% (p<0.01).
Prenalterol increased heart rate by 40% (p<0.01) and decreased LDCR by 29% (p<0.01).
After beta-blockade, significant effects of prenalterol were lost, while isoproterenol effects were diminished but still evident.

Structured PICO

Population

Conscious dogs evaluated for the effects of beta-adrenergic stimulation on coronary arterial diameter and blood flow.

Intervention

Beta-adrenergic stimulation with isoproterenol (0.1 microgram/kg), pirbuterol (1.0 microgram/kg), and prenalterol (20 micrograms/kg), with and without beta 1-adrenergic receptor blockade with atenolol (1 mg/kg)

Comparator

Baseline measurements and responses prior to beta-1 blockade

Outcome

Left circumflex coronary arterial diameter, blood flow, late diastolic coronary resistance (LDCR), and left circumflex coronary internal cross-sectional area (CSA)surrogate

In conscious dogs, large coronary arteries are regulated by beta-adrenergic mechanisms, with significant dilation mediated by both beta-1 and beta-2 adrenergic receptors.

Cite This Study

Vatner et al. (1982) studied Conscious dogs (animal model). Beta-adrenergic stimulation (Isoproterenol, Pirbuterol, Prenalterol) vs. Baseline / beta 1-adrenergic receptor blockade with atenolol was evaluated on Left circumflex coronary arterial diameter, blood flow, late diastolic coronary resistance (LDCR), and cross-sectional area (CSA). In conscious dogs, beta-adrenergic stimulation with isoproterenol increased mean coronary blood flow by 85% and cross-sectional area by 24%, indicating large coronary arteries are regulated by beta-adrenergic mechanisms.

synapsesocial.com/papers/6a238971ffed3004559ed60f https://doi.org/10.1161/01.res.51.1.56

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Regulation of large coronary arteries by beta-adrenergic mechanisms in the conscious dog.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Regulation of large coronary arteries by beta-adrenergic mechanisms in the conscious dog.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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