Long-Term Prognostic Value of Coronary CTA in Orthotopic Heart Transplant Recipients

Area of Science:

• Cardiology
• Transplant Medicine
• Radiology

Background:

• Coronary allograft vasculopathy (CAV) is a major cause of graft failure and mortality after heart transplantation.
• Early detection and risk stratification of CAV are crucial for improving long-term outcomes in heart transplant recipients.

Purpose of the Study:

• To evaluate the long-term prognostic value of coronary computed tomography angiography (CCTA) in predicting major adverse cardiovascular events (MACEs) in heart transplant recipients.
• To assess the association between CCTA findings, including obstructive and non-obstructive CAV and segment involvement score (SIS), and MACE rates.

Main Methods:

• Retrospective analysis of 114 heart transplant recipients who underwent CCTA for CAV surveillance.
• Patients were categorized based on the presence of obstructive (lumen reduction ≥ 50%) or non-obstructive (lumen reduction < 50%) CAV.
• Coronary Segment Involvement Score (SIS) was calculated to quantify the extent of coronary artery disease.

Main Results:

• Obstructive CAV was identified in 10.5% of patients.
• Patients with obstructive CAV had a significantly higher MACE rate (50%) compared to those with non-obstructive CAV (14.7%) (p < .05).
• Obstructive disease (HR=5) and SIS ≥ 4 (HR=3.46) were independently associated with increased MACE risk.

Conclusions:

• CCTA provides significant long-term prognostic information for predicting MACEs in heart transplant recipients.
• CCTA-detected obstructive CAV and a higher SIS are strong predictors of adverse cardiovascular outcomes.
• CCTA is a valuable tool for risk stratification and management of heart transplant recipients.