Atrial Fibrillation and Stroke Risk After Coronary Artery Bypass Grafting Surgery

Area of Science:

• Cardiology
• Neurology
• Surgical Outcomes

Background:

• Investigating preoperative atrial fibrillation (preop-AF) as a stroke risk factor in coronary artery bypass graft (CABG) surgery.
• Assessing perioperative stroke risk is crucial for patient safety during cardiac procedures.

Purpose of the Study:

• To determine the effect of preop-AF on stroke risk during the perioperative period in isolated CABG patients.
• To evaluate the predictive accuracy of the Northern New England Cardiovascular Disease Study Group (NNECVDSG) stroke risk schema.

Main Methods:

• Multicenter study involving 26,347 patients undergoing isolated CABG surgery across 21 Spanish centers.
• Recorded and analyzed baseline variables associated with perioperative stroke risk.
• Utilized the NNECVDSG stroke risk schema for risk stratification and outcome comparison.

Main Results:

• Prevalence of preop-AF was 4.2%, associated with major cardiovascular comorbidities.
• Overall stroke rate was 1.38%; slightly higher in preop-AF patients (1.82%) vs. non-preop-AF (1.36%), p=0.2.
• The NNECVDSG schema demonstrated good predictive ability (c-statistic 0.696); preop-AF had a lower impact on stroke risk compared to other variables.

Conclusions:

• Preoperative atrial fibrillation does not significantly elevate the risk of perioperative stroke in patients undergoing isolated CABG surgery.
• The NNECVDSG stroke risk index effectively predicted outcomes, and preop-AF did not adversely affect risk stratification within its quartiles.