The predictive value of preimplant pulmonary function testing in LVAD patients

Area of Science:

• Cardiology
• Pulmonology
• Medical Devices

Background:

• Preoperative pulmonary function testing (PFT) predictive value for left ventricular assist device (LVAD) patients is not well-established.
• This study investigates the association between abnormal PFTs and post-implantation outcomes in LVAD recipients.

Purpose of the Study:

• To evaluate the impact of preoperative PFT abnormalities on respiratory adverse events (AEs) and survival following LVAD implantation.
• To identify specific PFT metrics that correlate with increased risk in LVAD patients.

Main Methods:

• Retrospective analysis of 333 LVAD implants between January 2004 and December 2018.
• Patients were categorized based on normal versus abnormal preoperative PFT results.
• Primary outcome: respiratory AEs; Secondary outcomes: 1-year survival, bleeding, renal failure, thromboembolism, device malfunction.

Main Results:

• 53.5% of patients had abnormal PFTs, showing significantly higher rates of respiratory AEs (25.9% vs. 15.1%).
• A forced expiratory volume in 1 second/forced expiratory volume (FEV1/FVC) ratio < 0.5 strongly predicted respiratory AEs (HR 16.32).
• One-year survival was similar, but severely reduced FEV1 (<60%) and FEV1/FVC (<0.5) were associated with increased mortality risk.

Conclusions:

• Abnormal preoperative PFTs do not contraindicate LVAD implantation but aid in risk stratification for respiratory AEs and mortality.
• Patients with severely reduced PFT metrics (e.g., FEV1/FVC < 0.5) represent a higher-risk subset requiring careful selection and management.
• Preoperative PFTs are valuable tools for identifying LVAD candidates who may benefit from closer monitoring and tailored perioperative care.