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Left Atrial Diameter Index Predicts Cerebrovascular Events After POAF Following CABG.

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The left atrial diameter index (LADI) can predict cerebrovascular events (CVE) in patients who develop postoperative atrial fibrillation (POAF) after coronary artery bypass grafting (CABG). High LADI indicates a significantly increased risk of CVE post-surgery.

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Area of Science:

  • Cardiology
  • Neurology
  • Medical Diagnostics

Background:

  • Postoperative atrial fibrillation (POAF) is a common complication following coronary artery bypass grafting (CABG).
  • POAF is associated with an elevated risk of cerebrovascular events (CVE), both short-term and long-term.
  • Predictive markers for CVE in this patient population are crucial for risk stratification.

Purpose of the Study:

  • To evaluate the prognostic capability of the left atrial diameter index (LADI) in predicting CVE.
  • To assess LADI's value in patients who experienced POAF after isolated CABG but were discharged in sinus rhythm.
  • To determine if LADI can aid in identifying patients at higher risk for CVE post-CABG.

Main Methods:

  • A cohort of 392 patients who developed POAF after isolated CABG and were discharged in sinus rhythm was analyzed.
  • Preoperative LADI was measured, and an optimal cutoff of 21.2 mm/m² was established.
  • Patients were categorized into low (≤21.2 mm/m²) and high (>21.2 mm/m²) LADI groups.
  • Cox proportional hazards modeling and Kaplan-Meier analysis were used to assess the association between LADI and CVE over a mean follow-up of 42.4 months.

Main Results:

  • The overall incidence of CVE was 7.7%, with 2.0% occurring in-hospital.
  • Patients with high LADI exhibited a significantly higher CVE incidence (19.8%) compared to those with low LADI (2.8%).
  • Multivariable analysis identified high LADI, older age, hypertension, and congestive heart failure as independent predictors of CVE.

Conclusions:

  • The left atrial diameter index (LADI) is a valuable and easily measured preoperative parameter.
  • LADI independently predicts long-term cerebrovascular event risk in patients with POAF after CABG.
  • LADI can enhance postoperative risk stratification for CVE in this specific patient group.