Prediction of sudden death in obstructive hypertrophic cardiomyopathy after septal myectomy: Targeting the candidate
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Published on: April 21, 2014
Tao Lu1, Zhengyang Lu1, Yanhai Meng2
1Department of Adult Cardiac Surgery, Fuwai Hospital, Chinese Academy of Medical, Sciences and Peking Union Medical College, National Center for Cardiovascular, Diseases, Beijing, China.
Insights
Current guidelines inadequately predict sudden cardiac death (SCD) risk in hypertrophic cardiomyopathy patients post-surgery. Left ventricular wall thickness and late gadolinium enhancement are key indicators for improved risk assessment.
Area of Science:
- Cardiology
- Cardiac Surgery
- Electrophysiology
Background:
- Hypertrophic cardiomyopathy (HCM) management requires precise risk stratification for sudden cardiac death (SCD).
- Postoperative SCD risk assessment in HCM patients undergoing septal myectomy is crucial but challenging.
- Existing guidelines may not fully capture the nuances of SCD risk in this specific patient population.
Purpose of the Study:
- To evaluate the applicability of current American Heart Association (AHA)/American College of Cardiology (ACC) and European Society of Cardiology (ESC) guidelines for SCD risk stratification in postoperative HCM patients.
- To identify key predictors of SCD in adult patients following septal myectomy.
- To assess the effectiveness of implantable cardioverter-defibrillator (ICD) recommendations based on current guidelines.
Main Methods:
- Retrospective analysis of 1915 adult patients who underwent septal myectomy between 2010 and 2019.
- Application of competing risk models to assess guideline effectiveness for ICD recommendations.
- Survival analysis to identify significant SCD predictors, including left ventricular wall thickness (LVWT) and late gadolinium enhancement (LGE).
Main Results:
- No significant differences were observed in guideline-based ICD recommendations or SCD risk between event and nonevent groups.
- Current AHA and ESC guidelines did not significantly predict SCD.
- LVWT (P=0.028) and LGE (P=0.015) were significant predictors of SCD.
- Patients with LVWT ≥30 mm and LGE ≥15% exhibited a significantly higher risk of SCD (SHR, 5.60; P=0.002).
Conclusions:
- Current guidelines are insufficient for accurately assessing postoperative SCD risk in hypertrophic cardiomyopathy patients.
- LVWT and LGE are reliable indicators for SCD risk stratification in this cohort.
- Novel approaches are needed to guide ICD implantation decisions for improved patient outcomes.
Objective:
To evaluate the applicability of current guidelines for patients with postoperative hypertrophic cardiomyopathy and identify key risk factors for sudden cardiac death (SCD).
Methods:
We retrospectively analyzed 1915 adult patients who underwent septal myectomy from 2010 to 2019. Competing risk models assessed the effectiveness of the updated 2024 American Heart Association (AHA)/American College of Cardiology and 2023 European Society of Cardiology (ESC) guidelines in guiding implantable cardioverter defibrillator (ICD) recommendations for preventing SCD after surgery.
Results:
Over a follow-up period of 4.6 ± 2.7 years, 19 SCD events and 1 ICD discharge were observed. No significant differences were found in AHA (Class 2a: 55% vs 39.3%; Class 2b: 5% vs 5.4%; Class 3: 40% vs 55.3%, P = .354) or ESC (Class 2a: 45% vs 45.3%; Class 2b: 20% vs 22.8%; Class 3: 35% vs 31.9%, P = .937) ICD recommendations, prevalence of major SCD risk factors, or 5-year SCD risk between event and nonevent groups. Survival analysis showed that ESC and AHA stratification did not significantly predict SCD (both P > .05). Left ventricular wall thickness (LVWT) (P = .028) and late gadolinium enhancement (LGE) (P = .015) were significant predictors. Cardiac index showed a potential association with SCD (nonlinear trend, P = .012; overall, P = .027). Patients with LVWT ≥30 mm and LGE ≥15% had a greater risk of SCD (subdistribution hazard ratio, 5.60; 95% confidence interval, 1.90-16.5, P = .002).
Conclusions:
Current guidelines are inadequate for assessing postoperative SCD risk in patients with hypertrophic cardiomyopathy. LGE and LVWT are reliable indicators, highlighting the need for novel approaches to guide ICD implantation.
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