PMC9149536_01
Results of thermoregulatory sweat tests. a On the initial visit, 3 years after the onset of the symptoms, the TS test showed left-sided delay of sweating, more prominently on the upper part of the body. The left-side of the forehead was almost anhidrotic. b Last TS test (14 years after the onset) revealed extensive hypo- or anhidrosis with patchy sweating spots and segmental area of relatively abundant sweating on the left mid-trunk. The numerals at the bottom represent the core temperature and time in minutes after the start of heating.
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F1
T4/5 level displayed an area of relatively abundant sweating than adjacent segments (Fig. 1a). TS rates on the left side were unevenly reduced compared with the right side (Table 1), showing 2%, 2%, and 87% of the right-side values for the forehead, forearm, and leg, respectively. During the following 3 years, sudomotor function was investigated twice (at the age of 66 and 68 years), and the results revealed progressive deterioration of the postganglionic sudomotor function (Fig. 1b; Table 1).