[Studies in medical meteorology at the "Zentralanstalt für Meteorologie und Geodynamik" at Vienna (author's transl)].

Weather situations connected with small pressure gradients show a statistically significant correlation with the liability to heart-attacks. Changes from cyclonic to anticyclonic situations with descending air-motion lead to a rise of the number of heart-attacks in summer. In winter the change from anticyclonic to cyclonic pressure distributions seems to be critical.