Click on image to view larger version.

Figure 2 Study design and times of electrocardiogram (ECG) recording. At each time point indicated by an X, a 12-lead ECG was recorded for 10 s at 1-min intervals for 10 min (total of 10 ECGs recorded at each time point). For ibutilide treatment days (bottom panel), at each time point indicated by a filled circle, a single 12-lead ECG was recorded for 10 s. Administration of oral tadalafil and placebo was double blind and administration of intravenous ibutilide was unblinded. x = 10 ECGs obtained at 1-min intervals; • = single ECG.