Safety and Feasibility of the CorVad Percutaneous Ventricular Assist System in Refractory Right Heart Failure

Inclusion criteria

• Patients who develop refractory right heart failure within 48 hours after left ventricular assist device (LVAD) implantation, myocardial infarction, heart transplantation, or open-heart surgery, defined as:
• despite ongoing treatment with oral heart failure medications, including continuous infusion of high-dose inotropic agents and/or vasopressors, and/or the use of more than one inotropic agent and/or vasopressor, the cardiac index (CI) remains less than 2.2 L/min/m²;
• and meets any one of the following criteria: 1) CVP \> 15 mmHg; or, 2) CVP/pulmonary capillary wedge pressure (PCWP) or CVP/left atrial pressure (LAP) \> 0.63; or, 3) echocardiographic evidence of moderate-to-severe right ventricular dysfunction meeting one of the following criteria: right ventricular basal diameter \> 42 mm, right ventricular short-axis (or mid-chamber) diameter \> 35 mm, tricuspid annular systolic excursion (TAPSE) score \< 14 mm, right ventricular fractional area change (FAC) \< 30%, tricuspid annular systolic peak velocity (TDI S') \< 9 cm/s, and right ventricular free wall longitudinal strain \> -20%.
• ≥ 18 years old.
• The patient or the patient's legal representative agrees to sign the informed consent form.

Exclusion criteria

• INTERMACS Stage 1 is defined as: despite the use of inotropic agents (positive inotropic drugs) and/or temporary mechanical support (such as IABP or ECMO), the patient remains hypotensive and shows signs of inadequate perfusion of vital organs (such as oliguria or worsening liver function), requiring immediate initiation of mechanical circulatory support to survive.
• Severe hepatic or renal dysfunction, defined as total bilirubin ≥ 5 mg/dL or creatinine ≥ 4 mg/dL within 24 hours prior to treatment with the investigational device.
• For patients who have undergone LVAD implantation, acute neurological injury occurring after implantation, including stroke, hypoxic encephalopathy, or acute neurological deficits (such as seizures or altered levels of consciousness).
• Acute myocardial infarction with mechanical complications, including ventricular septal defect, cardiac rupture, or papillary muscle rupture.
• Failed revascularization (for patients requiring right coronary revascularization), defined as a TIMI blood flow grade of 0 or 1 following percutaneous coronary intervention or coronary artery bypass grafting.
• Active infection, meeting at least two of the following criteria: white blood cell count \> 12,500/μL, positive blood culture, or fever.
• Thrombus in the right atrium, right ventricle, and/or pulmonary artery.
• History of mechanical valve replacement of the tricuspid or pulmonary valve.
• Severe tricuspid stenosis or regurgitation.
• Severe pulmonary valve stenosis or regurgitation.
• Severe pulmonary hypertension, defined as a pulmonary artery systolic pressure \> 60 mmHg.
• Current diagnosis of pulmonary embolism.
• History of pulmonary artery graft replacement (artificial vessel).
• Current use of a right heart assist device or extracorporeal membrane oxygenation (ECMO) device.
• Thrombosis of the internal jugular vein and deep veins of the lower extremities, and/or the presence of a vena cava filter.
• Anatomical conditions that interfere with pump implantation or the safe use of the device, such as aortic dissection, Marfan syndrome, Erdheim-Chirlow disease (i.e., idiopathic medial necrosis, commonly associated with aortic dissection), etc.
• Congenital heart disease that precludes device implantation, or an unrepairated atrial septal defect or patent foramen ovale.
• Allergy or intolerance to contrast agents, or intolerance to anticoagulant or antiplatelet therapy.
• History of thrombolytic therapy within the past 30 days, known coagulation disorders, or hematologic disorders causing blood cell fragility or hemolysis.
• Female patients who are pregnant or breastfeeding.
• Participation in any other clinical trial that may confound the study results or affect the study outcomes.
• Other circumstances deemed by the investigator to be incompatible with inclusion in this study.