Meteorological influences on myocardial infarction in the metropolitan area of Milan.

We attempted to relate admission rate for acute myocardial infarction with some meteorological variables in a region having a temperate climate. We used 2830 consecutive episodes collected over a 2-year (1979-1980) period. The temperatures, atmospheric pressure, relative humidity, front passage, rain and snow and foehn wind have been associated in the past with acute myocardial infarction. No significant association with any of them was found in our study, nor any correlation over the time between admission rates in six different Coronary Care Units (at the time the only ones active in the area) which participated in the study.