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By means of a thermocouple inserted through the lumbar puncture needle, the temperature of the cerebrospinal fluid was measured in eighty instances (seventy-two patients) and compared with the rectal temperature.
In fifty instances in which the rectal temperature was normal (between 36.8 and 37.3 C. [98.2 and 99.1 F.] with an average of 37.15 C [98.8 F.]), the temperature of the cerebrospinal fluid averaged 37.68 (99.8 F.) or 0.53 C. higher than the rectal temperature. In forty-seven of the total of eighty-one examinations, the temperature of the cerebrospinal fluid was 0.5 C. or more higher than the rectal temperature, the greatest difference being 1.5 C. in one instance, while in only two instances was the temperature of the cerebrospinal fluid more than 0.2 C. less than the rectal temperature, the greatest difference being 0.7 C. in one instance.
Rachithermométrie Humaine: Recherches thermoélectriques.. Arch NeurPsych. 1931;26(3):686. doi:10.1001/archneurpsyc.1931.02230090219025