Abstract P57: Atmospheric Conditions Predict an Occurrence of Out-of-Hospital Cardiac Arrests: A 9-year Population-based Utstein-style survey in Osaka
Introduction: Although an association between low temperatures and an increase in sudden cardiac arrest occurrence is reported, it is unclear other weather conditions including atmospheric pressure influence the occurrence of out-of-hospital cardiac arrest (OHCA).
Methods: Design Population-based cohort study.
Participants We enrolled all OHCA of presumed cardiac etiology in adults (>17 years old) treated by emergency medical service (EMS) in Osaka Prefecture (population, 8.8 million), Japan from May 1st 1998 through December 31st 2006.
Data collection and analyses Patients’ data were prospectively collected by EMS personnel using an Utstein-style database. Meteorological data including mean and circadian variation of temperature and atmospheric pressure were collected from the database of Japan Meteorological Agency. We stratified temperature data to tertile categories and atmospheric pressure to quintile, and an association between a daily event rate of OHCA and weather conditions was analyzed.
Results: There were 25,026 OHCA patients of presumed cardiac etiology during the period. Daily OHCA incidence increased with a decreasing of temperature. The higher atmospheric pressure was also associated with the increased daily event rate of OHCA on the days with middle temperature (12.0 –21.9 °C) (Pearson’s correlation coefficient, 0.02; p<0.05, Figure⇓).
Conclusions: Data from a large-scaled population-based cohort suggests that atmospheric conditions including atmospheric pressure influence the occurrence of OHCA.