[Increase in surgical safety]

The authors discuss the problem of operation period safety. It is postulated that the patients' safety depends on the members of operative team. To analyze this aspect the method of theory of probabilities was used. The significant dependence of complication probability on the duration of operation period and associated factor of tiredness of surgical staff is shown in the article. The way of forming the operative team taking into account the psychophysical qualities of its members is proposed.