Drops in Barometric Pressure Are Associated with Deep Intracerebral Hemorrhage

Background and purpose The objective of this study is to assess the effects of changes in barometric pressure and outdoor temperature on the incidence of different subtypes of intracerebral hemorrhage (ICH). Methods Consecutive patients with primary supratentorial ICH were included. All patients resided in the same geographic area. We compared patients with subcortical ICH to those with cortical ICH. Meteorological data were continuously accrued. High-risk ICH days were defined as those on which 1 or more patients with ICH were admitted and compared to non–high-risk days. We analyzed the relationship between spontaneous ICH location and averaged daily atmospheric pressures and temperatures. Results We included 206 patients (147 with deep ICH and 59 with lobar ICH). Patients with deep ICH were younger ( P