Use of cardiocerebral resuscitation or AHA/ERC 2005 Guidelines is associated with improved survival from out-of-hospital cardiac arrest: a systematic review and meta-analysis.

BMJ Open · 2012 · PMC4401819 · PMID 23036985

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showed a trendno p-value reported

30 Subgroup analysis of the patients with a presenting rhythm of witnessed VF/VT showed a trend towards improved survival for the AHA/ERC 2005 Guidelines as compared to the AHA/ERC 2000 Guidelines.

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an overall trendno p-value reported

Studies using AHA/ERC 2005 Guidelines showed an overall trend towards increased survival, but significant heterogeneity existed among these studies.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.