How accurate is point-of-care focused echocardiography in predicting outcome of resuscitation in cardiac arrest patients?

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Why is this study important?

Point-of-care (POC) echocardiography can potentially guide the resuscitation of patients in cardiac arrest through prognostication and identification of reversible causes of arrest. This meta-analysis seeks to determine if the presence of cardiac activity on an echocardiogram accurately predicts survival.

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

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