CIRCULATION IN PYREXIA

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Abstract
The cardiovascular changes in experimental pyrexia from exposure to heat resemble in many respects those seen during fever, but in other respects they differ considerably. The pulse rate varies in experimental pyrexia according to the body temperature, in a manner similar to that in fever. In chart 1 the changes1in pulse rate with rise of body temperature produced by lying in a hot bath are compared with those2induced by sitting in a hot room and with the commonly accepted change in pulse rate in fever (increase of from eight to ten beats a minute for each degree above 98.6 F.). It will be observed that the changes are of similar order, though in both experimental conditions the pulse rate tended to be faster at any given temperature level when the temperature was rising than when it was falling, and, to some extent at any rate, irregularities

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