[Epistaxis and climatic events].

Data concerning daily climatic conditions in the area of Perugia during 1987-1990 have been gathered and correlated to daily incidence of idiopathic nose-bleeding observed in the same area and during the same period (1064 patients on the whole). The aim was to verify the relation between climatic events and "epistaxis" phenomenon, relation that has been assumed since a long time but has never been scientifically demonstrated before. Following factors have been estimated: highest and lowest daily temperature, thermal gradient, atmospheric pressure and pressure gradient, relative humidity. Results of statistic correlations show that every climatic factors has a narrow range related to higher incidence of epistaxis and that nose-bleeding is likely conditioned by combination of critical values, as a low temperature with 4 degrees C daily gradient, a 716 mm Hg atmospheric pressure with 2 mm Hg negative gradient, a close to 100% relative humidity.