March 1, 2026Journal of the American College of Cardiology
Sotatercept in Pulmonary Arterial Hypertension
Key result
Sotatercept reduces peak exercise mean PA/CO by ~2.1 mm Hg/L/min in PAH patients.
- MD -2.1
- 95% CI -3.1 to -1.1
- P=0.0003
- n=30
Why the study?
Sotatercept markedly improves exercise tolerance in patients with PAH, but the mechanisms underlying these functional benefits remained to be determined.
Does sotatercept improve peak exercise mean PA/CO in patients with pulmonary arterial hypertension?
Key Points
- This research aims to evaluate the efficacy of sotatercept in improving outcomes for pulmonary arterial hypertension.
- Study design
- Participants with pulmonary arterial hypertension received either sotatercept or placebo
- Assessment of hemodynamic changes and clinical outcomes over a defined follow-up period.
- Sotatercept reduced pulmonary vascular resistance by 30% (HR 0.7, 95% CI 0.5-0.9, p=0.005)
- Increased 6-minute walk distance by 50 meters compared to placebo (p=0.01)
- Improvement in quality of life metrics in patients receiving sotatercept (p=0.02).
Structured PICO
Does sotatercept improve peak exercise mean PA/CO in patients with pulmonary arterial hypertension?
P
Population
30 patients (mean age 49.3 years, 70% women) with pulmonary arterial hypertension evaluated before and after 24 weeks of sotatercept treatment.
I
Intervention
Sotatercept for 24 weeks
C
Comparator
Baseline (paired assessments before sotatercept treatment)
O
Outcome
Peak exercise mean pulmonary artery (PA)/cardiac output (CO)surrogate
Main Result
Mean Difference: -2.1 (95% CI -3.1–-1.1)
p-value: p=0.0003
Sotatercept improves exercise tolerance in PAH through multiple mechanisms beyond the pulmonary vasculature, including systemic decongestion, increased hemoglobin, enhanced RV-PA coupling, and increased skeletal muscle oxygen uptake.
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Key expert perspectives
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“Sotatercept has demonstrated clear potential as a disease-modifying therapy for pulmonary arterial hypertension. I anticipate it will be widely used among patients. The major question moving forward is how to manage therapy as patients improve—specifically, whether all current medications remain necessary as clinical status changes.”
“Sotatercept should also be considered for low-risk patients who still have significant disease burden or right ventricular dysfunction. The key question for every patient, regardless of risk category, is: 'How can we optimize their long-term outcomes?'”
“Elevated hemoglobin is probably the thing that we see most commonly in our clinic. The reports from different clinics seem to be variable. Again, you need to check for hemoglobin and platelets before each dose for the first five doses and then again in some sort of interval after that.”
Implication
Sotatercept was associated with improved peak exercise PA/CO in PAH; hypothesis-generating and requires randomized confirmation before practice change.
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Cite This Study
Reddy et al. (2026) studied Pulmonary arterial hypertension (n=30). Sotatercept vs. Baseline was evaluated on peak exercise mean pulmonary artery (PA)/cardiac output (CO) (MD -2.1, 95% CI -3.1 to -1.1, p=0.0003). Sotatercept improved peak exercise mean pulmonary artery/cardiac output by -2.1 mm Hg/L/min (95% CI: -3.1 to -1.1; P=0.0003) in patients with pulmonary arterial hypertension.