Fig. 3From: Assessment of endothelial cell function and physiological microcirculatory reserve by video microscopy using a topical acetylcholine and nitroglycerin challengeRepresentative still images and space-time diagrams of the venules depicting the native sublingual microcirculation (a) as well as after the topical sublingual application of acetylcholine (b) and nitroglycerin (c). Stimulation with nitroglycerin leads to an increase of total vessel density through recruitment of capillaries and an increase in flow velocity in the capillaries and venulesBack to article page