Objective and subjective assessments of temperature differences between the hands in reflex sympathetic dystrophy

Objective: A difference in temperature between the affected and normal extr emity is one of the signs or symptoms of reflex sympathetic dystrophy (RSD) . These temperature differences are scored anamnestically, by palpation, or by measurements. We investigated the relationship between objective and su bjective differences in skin temperature between the hands. Subjects and design: Fifty-one patients with RSD of one upper extremity par ticipated (mean age 55 years, range 18-80). In the first 16 we investigated the reliability of the visual analogue scale (VAS) for recording perceived differences in skin temperature. In the remaining 35 patients the relation ship between the VAS and objective infrared radiometry of the hands was inv estigated. Setting: Outpatients clinics of two university hospitals. Results: The VAS was found to be reliable in terms of response stability. T here was no significant correlation between the objective and subjective ou tcomes. Conclusions: There is lack of correspondence between objective and subjecti ve temperature measurements, which may be due to a normal discrepancy betwe en objective and percieved temperature, and/or to alterations in perception due to RSD.