RODDIE, I. C. 
DISCUSSION 
DR. HENSEL; I have a question concerning the method of 
monitoring the skin temperature. You have just stressed the draw- 
backs of skin temperature measurement as a measure of blood flow; 
in your last figure, you showed three different increases, the highest 
increase in the finger and medium in the ear and then in the chest; 
and you started with three different initial temperatures. As I saw, 
o o o 
the finger was about 25 C, the ear was 28 C, and the chest 22 C. 
So, the increase in skin temperature is a function of the initial 
temperature. If you have the same increase in blood flow, you get a 
higher increase in skin temperature, the lower the initial tempera- 
ture. It is extremely difficult to draw any quantitative conclusions. 
The skin temperature cannot rise more than to 36 C or something 
like that. 
DR. RODDIE: I would agree with this. I think that this can only 
be a first approach. 
DR. HENSEL: Yes, and I would suggest trying this again with 
the heated thermocouple technique which can be used for quantitative 
evaluation of the skin. 
DR. RODDIE: Actually, we have tried that and we were not 
completely happy. The reason for this was that the heat elimination 
which they record depends so much on the actual positioning of the 
heated thermocouple on the skin, that we felt it was difficult to 
compare absolute values on two sides of the body. If we found a 
slight difference in flow after heating, couldn't this be due to slight 
movement of the theiroocouple? 
DR. HENSEL: What type of heated thermocouple did you use, 
the type with a wire or with a plate? 
DR. RODDIE: We used the type with the plate. 
DR. HENSEL: I think it should work if properly applied. 
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