What question did this study set out to answer?

The study aims to determine if preintervention coronary arteriograms can predict improvement in left ventricular ejection fraction after reperfusion.

February 1, 1984Circulation

Return of left ventricular function after reperfusion in patients with myocardial infarction: importance of subtotal stenoses or intact collaterals.

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Why the study?

Does baseline coronary flow status predict improvement in left ventricular ejection fraction after emergency reperfusion in patients with acute myocardial infarction?

Population

63 patients with acute myocardial infarction undergoing emergency coronary arteriography at a mean of 7 hr…

Comparison

Emergency procedures to establish reperfusion. vs Comparison between 'no-flow' and 'limited-flow'…

Design

Cohort

Follow-up

12 +/- 7 days

Authors

WRWalter J. RogersUniversity of Maryland, Baltimore WHW HoodMedizinische Hochschule Hannover JMJohn A. MantleNational Institutes of Health

Discussion

Member takes

Implication

Baseline flow status may identify AMI patients unlikely to recover LVEF after reperfusion; leaves open whether flow-targeted strategies warrant prospective trials.

Key Points

The study aims to determine if preintervention coronary arteriograms can predict improvement in left ventricular ejection fraction after reperfusion.
Divided 63 patients with acute myocardial infarction into two groups: 'no-flow' and 'limited-flow'.
61 patients underwent emergency reperfusion procedures.
Follow-up angiography was performed 12 ± 7 days post-infarction.
Significant improvement in ejection fraction observed in 'limited-flow' patients with successful reperfusion.
Ejection fraction decreased significantly in 'no-flow' patients with unsuccessful reperfusion.
Magnitude of improvement was greater in anterior infarct cases compared to inferior infarct cases.

Structured PICO

Does baseline coronary flow status predict improvement in left ventricular ejection fraction after emergency reperfusion in patients with acute myocardial infarction?

Population

63 patients with acute myocardial infarction undergoing emergency coronary arteriography at a mean of 7 hr after onset of symptoms, divided into a 'no-flow' group (n=36) and a 'limited-flow' group (n=27).

Intervention

Emergency procedures to establish reperfusion (performed in 61 of 63 patients).

Comparator

Comparison between 'no-flow' (occluded infarct-related artery, no visible collaterals) and 'limited-flow' (subtotal stenosis or total occlusion with intact collaterals) groups, as well as 'successful' vs 'unsuccessful' reperfusion.

Outcome

Change in global and regional left ventricular ejection fraction at follow-up angiography (12 +/- 7 days after infarction).surrogate

Improvement in global ejection fraction after early reperfusion in acute myocardial infarction is unlikely to occur in the absence of preserved baseline flow (subtotal stenosis or collaterals) to the infarct area.

Cite This Study

Rogers et al. (1984) studied this question.

synapsesocial.com/papers/69f14cd3c0d8017361865ef3 https://doi.org/10.1161/01.cir.69.2.338

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Implication

Baseline flow status may identify AMI patients unlikely to recover LVEF after reperfusion; leaves open whether flow-targeted strategies warrant prospective trials.