Conditions: Pulmonary Arterial Hypertension
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 25
Healthy volunteers: yes

Brief summary:
This study will evaluate safety, tolerability and effects on central diastolic blood pressure (cDBP) of MK-8892 given as single oral doses in healthy male participants (Panel A and B) and in male participants with mild-to-moderate hypertension (Panel C).

Detailed description:
Up to three planned panels of either 8 healthy participants (Panels A and B) or 8 participants with mild to moderate hypertension (Panel C) will be enrolled. In Panels A and B, 8 participants will alternately receive single rising doses of MK-8892 or placebo. All doses will be administered in the fasted state, except Panel A, Period 5 in which a standard high-fat breakfast provided approximately 30 minutes prior to dosing.

Panel A will begin first. At least 3 days will elapse before participants in the alternate panel (Panel B) will receive the next higher dose. In Panel C, 8 mild to moderate hypertensive male participants will receive single rising doses of MK-8892 or placebo. Panel C may begin after the first 4 periods of Panels A and B have completed dosing. For all panels, there will be at least 7 days washout between treatment periods for any given participant. Participants may only be enrolled in one panel of the study. Subsequent doses in any panel will be administered only after careful evaluation of safety, tolerability, and pharmacodynamic effects of a given dose. All participants in periods of all panels (with exception of 2.0 mg fasted/fed periods) will be randomly assigned to either study drug or placebo, i.e a participant could be assigned to receive study drug in one period and placebo in another. As per the protocol allocation plan, the same participants will receive 2.0 mg MK-8892 in a fasted and fed state.The 2.0 mg MK-8892 fed/fasted data will be utilized for pharmacokinetic comparison and only the 2.0 mg MK-8892 fasted data will utilized for the analysis of the pharmacodynamics endpoints.

In addition, during any of the treatment periods if a participant demonstrates change in any one of the protocol-defined parameters lasting ≥1 hour, dose escalation in that participant will be halted and the participant may be withdrawn from the study or rechallenged at same dose or at a lower dose. Paricipants that meet criteria listed will be followed up until parameters no longer meet stopping rule criteria.

Arms:
arm 1: Within each of the 5 rising dose treatment periods, 6 participants received a single dose of MK-8892 0.5 mg, 2.0 mg, 6.0 mg, 14 mg or 2.0 mg fed, and 2 participants received placebo. Dosing periods will alternate with Panel B. arm 2: Within each of the 4 rising dose treatment periods, 6 participants received a single dose of MK-8892 1.0 mg, 4.0 mg, 9.0 mg or 12 mg, and 2 participants received placebo. Dosing periods will alternate with Panel A. arm 3: Within each of the 5 single dose treatment periods, 6 participants with mild to moderate hypertension received a single dose of MK-8892 0.5 mg, 1.0 mg, 2.0 mg or 6.0 mg, and 2 participants received placebo. Dosages will be determined by the results of Panels A and B.

Interventions: intervention 1: MK-8892 intervention 2: Placebo for MK-8892
Intervention descriptions: intervention 1: None intervention 2: None

Protocol document: