Related Experiment Videos
[Evaluation of ventricular arrhythmias late after coronary artery bypass graft surgery--relation to clinical
1First Department of Surgery, Osaka University Medical School, Japan.
Insights
Patients who underwent coronary artery bypass grafting (CABG) with serious ventricular arrhythmias (VA) had larger preoperative myocardial infarct size and worse left ventricular function. These findings highlight the importance of assessing infarct size and LV function post-CABG to predict VA risk.
Area of Science:
- Cardiology
- Cardiac Surgery
- Electrophysiology
Context:
- Coronary artery bypass grafting (CABG) is a common procedure for severe coronary artery disease.
- Ventricular arrhythmias (VA) are a potential complication after CABG.
- Ambulatory ECG monitoring is used to assess cardiac electrical activity.
Purpose:
- To investigate the relationship between ventricular arrhythmias (VA) and preoperative/postoperative factors in patients after CABG.
- To identify predictors of serious VA in the post-CABG population.
Summary:
- This study analyzed 150 patients post-CABG using ambulatory ECG monitoring.
- Patients with serious VA (Lown grade 4-5) showed significantly higher preoperative myocardial infarct size (Selvester score) and impaired left ventricular function (lower LVEF, higher LVEDP, LVESVI, LVEDVI) compared to those without serious VA.
- No significant differences were found in follow-up duration, coronary risk factors, or revascularization ratio.
Impact:
- Identifies preoperative myocardial infarct size and left ventricular dysfunction as key predictors of serious ventricular arrhythmias after CABG.
- Informs risk stratification and potential therapeutic strategies for post-CABG patients.
- Contributes to understanding long-term cardiac electrical stability following revascularization.
Abstract:
This study was undertaken to evaluate ventricular arrhythmias (VA) using ambulatory ECG monitoring in 150 patients 33 +/- 22 months (mean +/- SD) after successful CABG in relation to severity of coronary artery disease (LS: Leaman score, Circulation 1981), revascularization ratio (RI: preop. LS-postop.LS/preop.LS), preoperative myocardial infarct size (Selvester score: SQS, Circulation 1982), LV function and other variables. They were divided into two groups according to the Lown classification; 42 patients with serious VA (group A: grade 4 to 5), and 108 without them (group B: grade 0 to 3). Group A was older than group B (60 +/- 5 vs. 57 +/- 9; p less than 0.05). There were no significant differences in follow-up period, coronary risk factors, LS and RI between the groups. Group A had significantly higher SQS (7.5 +/- 3.2 vs. 2.6 +/- 1.9; p less than 0.01), LVEDP (preop.: 14 +/- 7 vs. 11 +/- 5 mmHg; p less than 0.05, postop.: 14 +/- 7 vs. 11 +/- 5 mmHg; p less than 0.05), LVESVI (preop.: 53 +/- 27 vs. 31 +/- 17 ml/M2; p less than 0.01, postop.: 53 +/- 35 vs. 30 +/- 14 ml/M2; p less than 0.01), LVEDVI (preop.: 93 +/- 28 vs. 72 +/- 22 ml/M2; p less than 0.01, postop.: 90 +/- 36 vs. 74 +/- 21 ml/M2; p less than 0.01), and lower LVEF (preop.: 44 +/- 15 vs. 58 +/- 11%; p less than 0.01, postop.: 44 +/- 15 vs. 60 +/- 10%; p less than 0.01) than group B.(ABSTRACT TRUNCATED AT 250 WORDS)