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BACKGROUND: The majority of out-of-hospital cardiac arrests (OHCAs) occur at place residence, which is associated with worse outcomes in unselected prehospital populations. Our aim was to investigate whether location of arrest was associated with outcome in a selected group of initial survivors admitted to intensive care.
METHODS: This is a post-hoc analysis of the Targeted Temperature Management after cardiac arrest trial (TTM trial), a multicenter controlled trial, randomizing 950 OHCA patients to an intervention of 33°C or 36°C. The location of cardiac arrest was defined as place of residence vs. public place or other. The outcome measures were mortality and neurological outcome, as defined by the Cerebral Performance Category scale, at 180 days.
RESULTS: Approximately half of 938 included patients arrested at place of residence (53%). Location groups did not differ with respect to age (p=0.11) or witnessed arrests (p=0.48) but bystander CPR was less common (p=0.02) at place of residence. OHCA at place of residence was associated with higher 180-day mortality, 55% vs. 38% (p<0.001) and worse neurological outcome, 61% vs. 43% (p<0.001) compared with a public place or other. After adjusting for known confounders, OHCA at place of residence remained an independent predictor of mortality (p=0.007).
CONCLUSIONS: Half of all initial survivors after OHCA admitted to intensive care had an at place of residence which was independently associated with poor outcomes. Actions improve outcomes after OHCA at place of residence should be addressed in future trials.
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