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SO403

Differential effects of ambient temperature anomalies on emergency department visits for different psychiatric conditions

DIFFERENTIAL IMPACT OF AMBIENT TEMPERATURE ANOMALY ON PRESENTATIONS TO THE EMERGENCY DEPARTMENT FOR VARIOUS PSYCHIATRIC CONDITIONS

As weekly ambient temperature anomalies increase, emergency department visits for (hypo)mania and bipolar depression rise, while visits for major depressive disorder, personality disorders, and non-affective psychosis show no significant change.

The study aimed to evaluate the differential effects of ambient temperature anomalies on emergency department (ED) visits for different psychiatric conditions. Using a cross-sectional design, psychiatric ED visits were aggregated weekly over 394 consecutive weeks, temperature deviations from the observation-period mean were calculated for each week, and temperature anomalies were examined in relation to visits within the same weekly window. A total of 12,833 visits were identified; the mean weekly number of visits was 32.6 ± 9.4 (range 7 to 68), and the mean temperature was 15.4 ± 7.6 °C (range 1.6 to 29.9 °C). The diagnostic distribution was as follows: major depression, 1,732; anxiety, 1,447; bipolar disorder, 996; psychosis, 545; personality disorders, 298; and other diagnoses, 2,555. The association between temperature anomalies and visits was R²=0.032, p<0.001 for (hypo)mania; R²=0.013, p=0.0248 for bipolar depression; and R²=0.010, p=0.0448 for anxiety disorders. In contrast, no significant association was observed for major depressive disorder (R²=0.004, p=0.223), personality disorders (R²=0.000, p=0.964), or non-affective psychosis (R²=0.000, p=0.666). The authors state that the findings support the hypothesis that high ambient temperatures are associated with acute exacerbations of bipolar disorder. Clinically, these findings call for consideration of the impact of climate change on mental health service utilization and investigation of the underlying pathophysiological mechanisms.

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