Figure 1.
Flowchart of the study protocol. Time points of the study were defined as baseline 1 before nitroglycerin infusion (TBL1), time point when peripheral perfusion was normalized at the maximum dose of nitroglycerin (TMX), and baseline 2 recorded 30 minutes after cessation of nitroglycerin infusion (TBL2). NTG, nitroglycerin.