“…However, any meaningful observations from subset analyses are difficult to derive owing to the small sample size. Provided that the mechanisms of action of OCT on human splanchnic vasculature are incompletely known, 13 one could speculate on variable effects of the OCT on cell membrane receptors of vascular smooth muscle, 14 on the release of gastrointestinal hormones, such as glucagon that have been reported to affect splanchnic blood flow, 15 or on possible systemic effects after OCT injection, 16,17 although this seems unlikely in view of the stable arterial blood pressure.…”