FIGURE 4.

Linear relationship between mean measured relative humidity (rH) and normalized sweat rate. Top left, ventilated capsule setup for recording quantitative palmar and left (L) forearm sweat rates. Inset: A, The HIH 3610 (humidity sensor; Honeywell Sensing and Control, Golden valley, MN); b, thermistor probe to measure skin temperature; and C, desiccated air tubing connecting to capsule. All 3 capsule sites are plotted. Clustering of responses below 10% rH relates to low sweat rates in the forearm site. Lower left, Quantitative sweat output in patients studied before and after upper thoracic endoscopic sympathotomy. Mann-Whitney u test reveals highly significant reductions in sweat rate for both palms and less robust reduction in forearm. Preop = preoperatively; Postop = postoperatively. Lower right, Surprising palmar and forearm emotional sweat outburst in patient postop. Marked reduction in resting sweat was noted postop with serial 7 and naming states stimuli (from 0-5 minutes); however, when examiner touched patient's feet (7.5-10 minutes), a remarkable sweating response was noted in palms and L forearm postop. R = right. Upper right, Mild emotional-induced sweating is often detected postop but is usually unnoticed by the patient.