A Study of Sotatercept for the Treatment of Cpc-PH Due to HFpEF (MK-7962-007/A011-16)

The 6MWD was performed to assess functional capacity. The 6MWD was assessed using the 6-minute walk test (6MWT) to measure the distance covered over a time period of 6 minutes. An increase in the distance walked during the 6MWT indicated improvement in functional exercise capacity. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

Clinical Worsening events were defined as the number of weeks from first dose date to any of the following:

• Hospitalization due to a cardiopulmonary indication (a non-elective hospitalization lasting at least 24 hours in duration caused by clinical conditions directly related to Pulmonary Hypertension and/or Heart Failure)
• Administration of intravenous diuretics or subcutaneous (SC) furosemide
• Death (all causes)
• Decrease in 6 minute walk distance (6MWD) by ≥15% from baseline confirmed by 2 tests at least 4hours, but no more than 1 week apart.

mPAP was calculated from systolic and diastolic pulmonary artery pressure measured by right heart catheterization. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

PCWP is an indirect estimate of left atrial pressure measured in right heart catheterization. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

TAPSE is an echocardiographic measurement of tricuspid valve annulus movement, as an indicator of right heart function. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

RVFAC is an echocardiographic measurement of percent change between right ventricular area during diastole and systole, as an indicator of right heart function. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

LVEF is an echocardiographic measurement of percent change between left ventricular volume during diastole and systole, as an indicator of left heart function. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

IVRT is an echocardiographic measurement of the interval between closure of the aortic valve, to onset of filling by opening of the mitral valve. It was used as an indicator of diastolic dysfunction. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

E/e' is a ratio of mitral inflow velocity E to mitral annular velocity (e') as measured by electrocardiography as an indicator of diastolic function. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

E/A is a ratio of the peak velocity flow of the E wave in the early diastole to peak velocity flow of the A wave in late diastole measured by echocardiography as an indicator of diastolic function. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

NT-proBNP is a circulating biomarker that reflects myocardial stretch. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

NYHA FC classified the extent of heart failure (HF). Participant HF symptoms were graded using the NYHA FC system. NYHA FC for HF ranges from Class I (no limitation of physical activity, or ordinary physical activity does not cause undue fatigue, palpitation, dyspnea [shortness of breath]), Class II (slight limitation of physical activity, comfortable at rest, or ordinary physical activity results in fatigue, palpitation, dyspnea [shortness of breath]), Class III (marked limitation of physical activity, comfortable at rest, or less than ordinary activity causes fatigue, palpitation, or dyspnea) and Class IV (unable to carry on any physical activity without discomfort, symptoms of HF at rest or if any physical activity is undertaken, discomfort increases). Participants were classified as "Improved or Maintained" or "Not Improved nor Not Maintained". Improved or Maintained = reduction in NYHA FC or no change in NYHA FC; Not Improved nor Not Maintained = increase in NYHA FC.

MCF is an echocardiographic measurement that determined the ratio of left ventricular stroke volume to myocardial volume and was an indicator of left ventricular systolic function. Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

An AE was defined as any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants who experienced an AE was reported.

An AE was defined as any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants who experienced an AE was reported.