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Sudden cardiac death after aortic valve surgery: incidence and concomitant factors
M Föppl1, A Hoffmann, F W Amann
1Division of Cardiology, University Hospital, Basel, Switzerland.
Insights
Sudden cardiac death is a significant risk after aortic valve surgery. Patients with left ventricular hypertrophy, bundle-branch block, and ventricular premature beats face higher risks.
Area of Science:
- Cardiology
- Cardiac Surgery
- Electrophysiology
Background:
- Aortic valve surgery is a common procedure for various heart conditions.
- Sudden cardiac death (SCD) is a critical concern following cardiac surgery.
- Identifying risk factors for SCD post-aortic valve replacement is crucial for patient management.
Purpose of the Study:
- To analyze mortality rates after aortic valve surgery.
- To identify predictors of sudden cardiac death in this patient population.
- To investigate the role of electrocardiographic findings and coronary artery disease in SCD.
Main Methods:
- Retrospective analysis of 599 patients undergoing aortic valve surgery.
- Follow-up period of 1-14 years to assess mortality.
- Comparison of clinical, electrocardiographic, and surgical data between patients who died suddenly and other groups.
Main Results:
- Overall perioperative mortality was 6.9% and late annual mortality was 3.6%.
- Sudden cardiac death accounted for 24% of all deaths, occurring in younger patients.
- Left ventricular hypertrophy, ventricular premature beats, conduction disturbances, and ungrafted coronary vessels were associated with increased SCD risk.
Conclusions:
- Patients with left ventricular hypertrophy, bundle-branch block, and ventricular premature beats post-aortic valve replacement are at higher risk for SCD.
- Concomitant coronary artery disease may play a role in the etiology of SCD.
- Risk stratification and targeted interventions are needed to reduce SCD after aortic valve surgery.
Abstract:
A retrospective analysis of 599 consecutive patients after aortic valve surgery aged 7-82 years (mean 56) was performed. During a follow-up of 1-14 years (mean 4.7 years) a 4-week perioperative mortality of 6.9% and a late annual mortality of 3.6% were observed. Sudden cardiac death was the most frequent single cause of death, accounting for 24% of all deaths. Patients dying suddenly were younger than patients dying from other causes (51 +/- 17 vs. 59 +/- 14 years, p less than 0.05) and showed more left ventricular hypertrophy by electrocardiographic criteria when compared with matched survivors (mean Estes score 5.2 +/- 2.4 vs. 2.8 +/- 1.9; p less than 0.01) and with patients dying nonsuddenly (mean Estes score 5.2 +/- 2.4 vs. 1.8 +/- 1.8; p less than 0.01). Ventricular premature beats in the resting electrocardiogram were more prevalent in patients dying suddenly than in matched survivors (55 vs. 20%; p less than 0.025) as well as in patients dying from other causes (55 vs. 25%; p less than 0.05). In addition, there were more intracardiac conduction disturbances and more ungrafted coronary vessels with insignificant stenoses at the time of surgery in sudden death patients. Our findings suggest that after aortic valve replacement patients with left ventricular hypertrophy, bundle-branch block, and ventricular premature beats in the resting electrocardiogram are at increased risk for sudden cardiac death. A possible etiological role of concomitant coronary artery disease must be considered.