Single and repeated oral administrations of 3 doses of ivabradine

Placebo administration

Single and repeated oral administrations of 3 doses of ivabradine (2.5, 5, and 10 mg). Subjects were given a single administration of ivabradine during Period 1 (P1), following a 3-day washout, they were given repeated administrations twice daily for 4.5 days during Period 2 (P2).

For PK measurements, blood samplings were done: pre-dose then 20 min, 40 min, 1 h, 1.5 h, 2 h, 3 h, 4 h, 5 h, 6 h, 8 h, 10 h, 12 h, 16 h, 24 h, 36 h, 48 h, 60 h, and 72 h following the D1 single administration (P1) and the Day 8 (D8) last repeated dose (P2), respectively.Ivabradine and its main metabolite were determined using LC-MS/MS, then pharmacokinetic parameters were calculated by noncompartmental approach. Descriptive statistics were performed on the PK individual parameters calculated from the plasma concentration-time profiles.

For PD measurements, 24-hour Holter recordings were performed on Day0, Day1, Day8, and Day10. a resting 12-lead ECG were also performed.

The changes of heart rate between day 1 and baseline values, between day 8 and baseline values were studied over 24-hour, diurnal, nocturnal, awake and asleep period for each ivabradine dose in comparison with placebo. Descriptive statistics by dose were performed and confidence intervals of the differences between each dose of ivabradine and placebo were constructed using a non-parametric method based on Hodges & Lehman estimate for independent samples.