What question did this study set out to answer?

The study aims to determine the relationship between endothelial function and sensitivity to catecholamine-induced constriction in coronary arteries.

April 1, 1992CirculationOpen Access

Patients with evidence of coronary endothelial dysfunction as assessed by acetylcholine infusion demonstrate marked increase in sensitivity to constrictor effects of catecholamines.

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Why the study?

Does endothelial dysfunction increase sensitivity to the constrictor effects of catecholamines in human coronary arteries?

Population

15 patients (30 coronary segments) with minimal or no evidence of coronary atherosclerosis

Comparison

Intracoronary phenylephrine infusion (final… vs Intracoronary phenylephrine infusion in coronary…

Design

Cross-sectional

Authors

JVJoseph A. VitaPreventive Cardiology CTCharles B. TreasureTech-X (United Kingdom)AYAlan C. YeungInterventional Cardiology

Discussion

Member takes

Implication

May explain exercise-induced coronary constriction; hypothesis-generating for catecholamine sensitivity in endothelial dysfunction.

Key Points

The study aims to determine the relationship between endothelial function and sensitivity to catecholamine-induced constriction in coronary arteries.
Assessed vasomotor function via acetylcholine infusions in 30 segments from 15 patients with minimal coronary atherosclerosis.
Related acetylcholine responses to vasomotor responses from intracoronary phenylephrine infusions in the same segments.
In 18 segments with constriction to acetylcholine, a constrictor response to phenylephrine was observed at 100-fold lower concentration than in 12 segments without acetylcholine constriction.
The findings suggest that endothelial dysfunction increases sensitivity to catecholamines, linked to myocardial ischemia.

Structured PICO

Does endothelial dysfunction increase sensitivity to the constrictor effects of catecholamines in human coronary arteries?

Population

15 patients (30 coronary segments) with minimal or no evidence of coronary atherosclerosis

Intervention

Intracoronary phenylephrine infusion (final concentration, 10(-9) to 10(-6) M) in coronary segments with endothelial dysfunction (constricted to acetylcholine)

Comparator

Intracoronary phenylephrine infusion in coronary segments with intact endothelial function (did not constrict to acetylcholine)

Outcome

Vasomotor response to intracoronary phenylephrine infusionsurrogate

Endothelial dysfunction in coronary arteries is associated with a marked increase in sensitivity to the constrictor effects of catecholamines, potentially explaining exercise-induced constriction in atherosclerosis.

Cite This Study

Vita et al. (1992) studied this question.

synapsesocial.com/papers/6a2084c347fdc8d429f42549 https://doi.org/10.1161/01.cir.85.4.1390

Topics

Coronary artery disease Coronary CT angiography

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Patients with evidence of coronary endothelial dysfunction as assessed by acetylcholine infusion demonstrate marked increase in sensitivity to constrictor effects of catecholamines.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Topics

Patients with evidence of coronary endothelial dysfunction as assessed by acetylcholine infusion demonstrate marked increase in sensitivity to constrictor effects of catecholamines.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Topics

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