HS235 Treatment for Pulmonary Hypertension and Heart Failure

Inclusion Criteria: Participants are eligible to be included in the study only if they meet at least all the following criteria: 1. Male or female, ≥ 18 years of age. 2. \[Sub-population A only - using a remote PAP sensor\]- Ambulatory PAP monitoring (e.g., CardioMEMS™ HF System or Cordella™ HF System) implanted in the course of standard of care at least 90 days before Screening. Hemodynamic evidence of PH with: 1. mPAP ≥ 25 mm Hg, as measured by the ambulatory PAP monitoring system in supine position by the averaged 7-day values (weekly average) 2 weeks and 1 week before Randomization AND, 2. dPAP ≥ 15 mm Hg, as measured by the ambulatory PAP monitoring system in supine position by the averaged 7-day values (weekly average) 2 weeks and 1 week before Randomization. 3. Hemodynamic evidence of pre-capillary PH based on presence of PVR ≥ 240 dyn\*sec/cm5 or ≥ 3 WU obtained on most recent RHC obtained prior to screening. 3. \[Sub-population B only - without a remote PAP sensor\] Hemodynamic evidence of Cpc-PH based on the presence of all the following RHC parameters obtained during the Screening period, prior to randomization: 1. PVR ≥ 240 dyn\*sec/cm5 or ≥ 3 WU, and 2. mPAP \> 20 mmHg, and 3. PAWP \> 15 mmHg but \< 30 mmHg, and 4. dPAP ≥ 15 mmHg. 4. Established diagnosis of HFpEF with left ventricular ejection fraction (LVEF) ≥ 45 % as measured by echocardiography during Screening and and no documented LVEF \< 45% during the 2 years preceding Screening.. 5. New York Heart Association (NYHA) class II or III heart failure symptoms. 6. Stable diuretic regimen during the screening period. 7. Kansas City Cardiomyopathy Questionnaire-Clinical Summary Score (KCCQ-CSS) \< 90 at screening. 8. 6-minute walking distance (6MWD) ≥ 100 m at screening. 9. Body mass index ≥ 25 to ≤ 50 kg/m2 and Body weight ≤140 kg. 10. Ability to adhere to study visit schedule and understand and comply with all protocol requirements. Exclusion Criteria: 1. Hospitalization for any worsening medical condition or major surgery within 4 weeks prior to screening. 2. Occurrence of an acute coronary syndrome, percutaneous coronary intervention, or cardiac surgery within 90 days prior to Screening. 3. Implantation of a cardiac resynchronization therapy (CRT) device within 90 days before screening. 4. Planned cardiovascular revascularization or planned implantation of CRT device. 5. History of heart transplant or on heart transplant list. 6. History of serious or life-threatening cardiac arrhythmia within 90 days prior to screening. 7. Systemic hypotension or uncontrolled systemic hypertension. 8. History of Pericardial constriction or hypertrophic cardiomyopathy. 9. History of significant valvular stenosis or regurgitation. 10. Participants with a pneumonectomy or more than moderate Chronic Obstructive Pulmonary Disease (COPD) or mild interstitial lung disease (ILD) or untreated mild obstructive sleep apnea (OSA).