The goal of this observational study is to investigate the impact of oral warfarin anticoagulation combined with or without aspirin on the incidence of non-surgical hemocompatibility-related adverse events (HRAEs) and survival in advanced heart failure patients after implantation of the fully magnetic levitation left ventricular assist device (CH-VAD). The main question it aims to answer is : The incidence of non-surgical HRAEs and survival treated with oral warfarin anticoagulation combined with or without aspirin in Chinese CH-VAD implanted advanced heart failure patients. CH-VAD has been approved in China for the treatment of patients with advanced heart failure.
This was a multi-center, retrospective observational study including patients who underwent CH-VAD implantation in 13 participating centers after its commercial approval, from Aug 2022 through Aug 2025. Patients who died during the index hospitalization were excluded. Patients whose antiplatelet regimen was modified before the occurrence of the first non-surgical hemocompatibility-related adverse event (HRAE) were also excluded to avoid exposure misclassification. Patients were divided into two groups: those receiving aspirin in addition to warfarin (ASA+VKA) versus those receiving warfarin alone (VKA only). Warfarin was started once the patient was clinically stable and able to tolerate oral medication, with a target international normalized ratio (INR) of 2.0-2.5. For patients receiving aspirin, the dose was 100 mg daily. The primary endpoint was a composite of survival free of major nonsurgical HRAEs at 12 months. Nonsurgical events were defined as any event occurring \> 14-days post implant to avoid perioperative confounding. The composite endpoint was comprised of stroke, pump thrombosis, major nonsurgical bleeding, and peripheral arterial thromboembolism.
Study Type
OBSERVATIONAL
Enrollment
220
Patients who underwent CH-VAD implantation.
Fuwai Hospital
Beijing, Beijing Municipality, China
The primary endpoint was survival free from non-surgical HRAEs at 12 months, estimated using Kaplan-Meier methods.
The composite endpoint was comprised of stroke, pump thrombosis, major nonsurgical bleeding, and peripheral arterial thromboembolism. Nonsurgical events were defined as any event occurring \> 14-days post implant to avoid perioperative confounding.
Time frame: Reported data includes the period from 14-days post implant to study completion. Outcome measurement is performed at the study completion, a median follow-up of 368 days.
Secondary endpoints were the individual components of the composite.
The composite was comprised of stroke, pump thrombosis, major nonsurgical bleeding, and peripheral arterial thromboembolism. Nonsurgical events were defined as any event occurring \> 14-days post implant to avoid perioperative confounding.
Time frame: Reported data includes the period from 14-days post implant to study completion. Outcome measurement is performed at the study completion, a median follow-up of 368 days.
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