The RADial artery International ALliance (RADIAL) extended follow-up study: rationale and study protocol.

Area of Science:

• Cardiovascular Surgery
• Vascular Grafting
• Clinical Trial Analysis

Background:

• Radial artery (RA) grafts are generally accepted to have better mid-term patency than saphenous vein grafts (SVG) in coronary artery bypass grafting (CABG).
• Existing evidence supporting RA's clinical benefits is largely from observational studies, susceptible to bias and confounding factors.
• The RADial artery International Alliance (RADIAL) pooled analysis of randomized trials showed improved freedom from cardiac events at 5 years for RA, but with limitations regarding angiographic follow-up.

Purpose of the Study:

• To present the protocol for a long-term analysis of the RADIAL database.
• To extend follow-up beyond 5 years to evaluate the long-term role of RA versus SVG in CABG.
• To provide robust data on the long-term outcomes associated with RA use in CABG.

Main Methods:

• Long-term follow-up analysis of the RADIAL database, extending beyond the initial 5-year period.
• Inclusion of data from randomized controlled trials comparing RA and SVG for CABG.
• Focus on clinical outcomes, including death, myocardial infarction, and repeat revascularization, beyond 5 years post-surgery.

Main Results:

• Previous RADIAL analysis indicated improved 5-year freedom from cardiac events with RA grafts.
• Limitations in the original RADIAL analysis included limited angiographic follow-up beyond 5 years.
• The current protocol aims to address these limitations by extending patient follow-up.

Conclusions:

• Further long-term data are needed to definitively establish the clinical superiority of RA over SVG in CABG.
• Extending follow-up beyond 5 years is crucial to understand the sustained benefits of RA grafts.
• This long-term analysis will provide critical insights into the role of RA in improving patient outcomes after CABG.