What question did this study set out to answer?

To quantify the progression and extent of irreversible myocardial cell death relative to the duration of coronary artery occlusion.

November 1, 1977CirculationOpen Access

The wavefront phenomenon of ischemic cell death. 1. Myocardial infarct size vs duration of coronary occlusion in dogs.

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Why the study?

Does the duration of coronary occlusion affect the extent of myocardial necrosis in dogs?

Key Points

To quantify the progression and extent of irreversible myocardial cell death relative to the duration of coronary artery occlusion.
Examined pentobarbital-anesthetized, open-chest dogs subjected to temporary circumflex coronary occlusion for 40 minutes, 3 hours, or 6 hours followed by 2 to 4 days of reperfusion.
Compared temporary occlusion intervals to permanent circumflex coronary artery ligation sustained for 24 or 96 hours.
Cellular death initiates in the subendocardium and progresses as a wavefront toward the subepicardium with increasing occlusion duration.
Transmural necrosis spans 38 ± 4% after 40 minutes, 57 ± 7% after 3 hours, 71 ± 7% after 6 hours, and 85 ± 2% after 24 hours of ischemic injury.

Structured PICO

Does the duration of coronary occlusion affect the extent of myocardial necrosis in dogs?

Population

pentobarbital anesthetized open chest dogs

Intervention

40 minutes, 3 hours, or 6 hours of temporary circumflex coronary occlusion (CO) followed by 2 to 4 days of reperfusion, or by 24 or 96 hours of permanent circumflex ligation

Outcome

myocardial necrosis (transmural necrosis)surrogate

Demonstrated that myocardial necrosis progresses as a wavefront from the subendocardium to the subepicardium over time, establishing the time-dependent window for myocardial salvage via reperfusion.

Discussion

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Implication

Supports time-sensitive reperfusion; extends foundational animal data but leaves open human validation.

Cite This Study

Reimer et al. (1977) studied this question.

synapsesocial.com/papers/69d56e1c75589c71d767d3d2 https://doi.org/10.1161/01.cir.56.5.786

View Full Paper

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The wavefront phenomenon of ischemic cell death. 1. Myocardial infarct size vs duration of coronary occlusion in dogs.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

The wavefront phenomenon of ischemic cell death. 1. Myocardial infarct size vs duration of coronary occlusion in dogs.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

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