Flow-mediated dilation and post-occlusive reactive hyperemia in ME/CFS patients and healthy controls.
DILATION
After administration of glyceryl nitrate sublingually, mean diameter was 3.69 mm (SD 0.59) in ME/CFS patients, and mean dilation in per cent was 23.3%, similar to healthy women (mean diameter 3.60 mm (SD 0.47) and mean dilation 22.6%). Adjusted for sex and baseline arterial diameter in ANCOVA, the results were similar and not significantly different between the two groups (p = 0.79) (In ME/CFS patients, mean PORH at baseline was 1354 PU (SD 754 PU). This was significantly lower than the control group (2208 PU, SD 1363 PU, p = 0.004 analyzed by Mann-Whitney test (