Background: Spontaneous pneumothorax is a common respiratory condition and has been postulated that it develops because of rupture of subpleural blebs. Although the morphology and ultrastructure of causative lesions are well known, the reason for rupture of sbupleural blebs is not absolutely clear. Broad consensus concerning the role of meteorological factors in spontaneous pneumothorax dose not exist. The aim of the study was to examine the influence of change of atmospheric pressure and temperature on the occurrence of spontaneous pneumothorax. Material and Method: One hundred twenty eight consecutive spontaneous pnemothorax events that occurred between January 2003 and December 2004 were selected. Changes of meteorological factors of particular days from the day before for 5 consecutive days were calculated and compared between the days with pneumothorax occurrence (SP days) and the days without pneumothorax occurrence (Non SP days). The correation between change of pressure and temperature and the occurrence of SP was evaluated. Result: SP occurred on 117 days (16.0%) in the 2-year period. Although there was no significant differences in change of pressure factors prior 4 days of SP occurrence compare to the 4 days prior Non SP day, change of mean pressure was higher (⁢0.934 vs. ⁣0.191hPa, RR 1.042, CI 1.003∼1.082, p=0.033), and change of maximum pressure fall was lower (3.280 vs. 4.791 hPa, RR 1.051, CI 1.013∼1.090, p=0.009) on the 4 days prior SP day. There were significant differences in change of temperature factors prior 2 days and the day of SP, Changes of mean temperature (⁣0.576 vs.⁢0.099oC, RR 0.886, 95% CI 0.817∼0.962, p=0.004) and maximum temperature rise (7.231 vs. 8.079oC, RR 0.943 CI 0.896∼ 0.993, p=0.027) were lower on the 2 days prior SP. But changes of mean temperature (0.533 vs. ⁣0.103oC, RR 1.141, CI 1.038∼1.255, p=0.006) and maximum temperature rise (9.209 vs. 7.754oC, RR 1.123, CI 1.061∼1.190, p=0.000) were higher on the SP days. Conclusion: Change of atmospheric pressure and temperature seems to influence the chance of occurrence of SP. Meteorological phenomena that pressure rise 4 day prior to SP and following temperature fall and rise might explain the occurrence of SP. Further studies should be continued in the future.

Keywords: Pneumothorax, Pressure, Temperature