DIFFICULTIES OF EPIDEMIOLOGICAL STUDIES 



of the respiratory infection, in any event. 



MITCHELL: You are speaking about hjrpothermia, and the 

 other people have been talking about cold exposure, and it turns 

 out that people exposed to cold up here may be more likely to 

 suffer from heat exhaustion than from cold, and I wonder, maybe, 

 if we should instrument a few people and put them out in the 

 cold. 



DRURY: Captain Veghte has considerable data on body tem- 

 peratures during cold exposure. 



MITCHELL: I imagine that there is more stress in thinking 

 about having to go on one of those maneuvers than there is in 

 the experience. 



MONCRIEF: In reference to Dr. Marcus's question to Dr. 

 Blair about incidence of infection with induced hypothermia. 

 Dr. Blair mentioned the fact that it is the individuals who have 

 the hypothermia induced by the extra- corporeal circuit that 

 have the increased incidence, if there is any. I think infection 

 is directly proportional to the number of couplings and number 

 of instruments that you have the patient hooked up to; and this, 

 I think, is very well pointed out in our normothermic patients 

 when we put on an extra- corporeal circuit such as extra- cor- 

 poreal hemodialysis for renal insufficiency, 



REINHARD: I am impressed by the fact that the conversa- 

 tion of the last hour has moved us into an area that looks some- 

 what like a bucket of worms, and I wonder whether or not we 

 are trying to sum up before we have ever heard what each person 

 has to contribute. 



23 



