What question did this study set out to answer?

To assess the antiarrhythmic efficacy and hemodynamic effects of various beta-adrenoceptor blocking agents with differing ancillary properties during acute coronary artery ligation.

August 1, 1983British Journal of PharmacologyOpen Access

The effect of β‐adrenoceptor blocking agents, with differing ancillary properties, on the arrhythmias resulting from acute coronary artery ligation in anaesthetized rats

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Why the study?

Do beta-adrenoceptor blocking agents suppress ventricular arrhythmias following acute coronary artery ligation in anaesthetized rats?

Population

Anaesthetized rats undergoing acute ligation of the main left coronary artery

Design

Preclinical

Follow-up

30 min

Authors

CCC. A. CampbellTufts University JPJ. R. ParrattUniversity of London

Discussion

Member takes

Implication

Hypothesis-generating in rodent ischaemia models; does not yet guide beta-blocker use in human post-MI arrhythmias.

Key Points

To assess the antiarrhythmic efficacy and hemodynamic effects of various beta-adrenoceptor blocking agents with differing ancillary properties during acute coronary artery ligation.
Administered beta-blockers with varying selectivity, membrane-stabilizing activity, and intrinsic sympathomimetic activity—including oxprenolol isomers, p-oxprenolol, practolol, propranolol, and timolol—to anaesthetized rats.
Ligated the main left coronary artery and recorded ventricular arrhythmias, including ectopic beats, ventricular tachycardia, and ventricular fibrillation, during the initial 30 minutes post-occlusion.
All tested beta-blockers suppressed acute postischemic ventricular arrhythmias, with cardioselective agents requiring less cardiac receptor blockade for protection than non-selective drugs.
The (-)-isomer of oxprenolol significantly outperformed the (+)-isomer in reducing ectopic beat frequency, ventricular tachycardia duration, and ventricular fibrillation duration.
Drugs with intrinsic sympathomimetic activity caused less pronounced hemodynamic deterioration, while cardiac beta-adrenoceptor blockade served as the principal antiarrhythmic mechanism.

Structured PICO

Do beta-adrenoceptor blocking agents suppress ventricular arrhythmias following acute coronary artery ligation in anaesthetized rats?

Population

Anaesthetized rats undergoing acute ligation of the main left coronary artery

Intervention

Beta-adrenoceptor blocking agents ((+), (-) and (+/-)-oxprenolol, p-oxprenolol, practolol, propranolol and timolol)

Outcome

Ventricular arrhythmias occurring within the first 30 min of acute coronary ligationsurrogate

Blockade of cardiac beta-adrenoceptors is the primary mechanism by which beta-blockers suppress early postischaemic ventricular arrhythmias in a rat model.

Cite This Study

Campbell et al. (1983) studied this question.

synapsesocial.com/papers/6a85461cabe7e878c19651d0 https://doi.org/10.1111/j.1476-5381.1983.tb10539.x

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The effect of β‐adrenoceptor blocking agents, with differing ancillary properties, on the arrhythmias resulting from acute coronary artery ligation in anaesthetized rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

The effect of β‐adrenoceptor blocking agents, with differing ancillary properties, on the arrhythmias resulting from acute coronary artery ligation in anaesthetized rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider