Patients with ColdU exhibit normal baseline skin blood perfusion
Before ICTs, at baseline, patients with typical ColdU, patients with atypical ColdU, and HCs exhibited similar skin blood perfusion with an average PPG amplitude of 6.2·10-4 ± 5.7·10-6 AU, 6.3 10-4 ± 4.6·10-5 AU, and 5.4·10-4 ± 3.6·10-5 AU, respectively. Across all study subjects and groups, age and sex were not linked to differences in PPG amplitudes.