Is there benefit from percutaneous coronary intervention for post-arrest patients without ST-elevation myocardial infarction?

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Why is this study important?

Of the approximately 500,000 adults (United States) who experience sudden cardiac arrest, only 10% survive to hospital discharge. Given that a large portion of these events is likely due to ischemia and evidence supports the use of percutaneous coronary intervention (PCI) in patients with ST-elevation myocardial infarction (STEMI), it is hypothesized that following cardiac arrest patients might benefit from this invasive procedure even without evidence of STEMI.

Which, if any, threats to validity are most likely to have an impact on the results and how?

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