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Risk factors for systolic dysfunction and ventricular dilatation in hypertrophic cardiomyopathy
R Bingisser1, R Candinas, J Schneider
1Department of Internal Medicine, University Hospital, Zurich, Switzerland.
Insights
Severely increased ventricular mass is a key risk factor for systolic dysfunction and ventricular dilatation in hypertrophic cardiomyopathy (HCM). This progression often leads to poor prognosis, even with advanced interventions like automatic cardioverter-defibrillators.
Area of Science:
- Cardiology
- Genetics
- Internal Medicine
Background:
- Hypertrophic cardiomyopathy (HCM) is a primary genetic heart muscle disease.
- Systolic dysfunction and ventricular dilatation are severe complications of HCM.
- Risk factors for these complications require further elucidation.
Observation:
- A case of an 18-year-old male with HCM who developed ventricular fibrillation, dilatation, and low cardiac output over 7 years.
- Literature review and statistical analysis of 17 patients with HCM complications compared to 139 HCM patients.
- Increased septal and posterior wall thickness were identified as significant risk factors.
Findings:
- Severely increased ventricular mass, indicated by greater septal and posterior wall thickness, is a risk factor for systolic dysfunction and ventricular dilatation in HCM.
- Age, sex, and septal-to-posterior wall thickness ratio were not significant risk factors.
- Prognosis for patients with these complications is generally poor.
Implications:
- Early identification of increased ventricular mass may aid in risk stratification for HCM patients.
- Further research into the mechanisms linking ventricular mass to systolic dysfunction is warranted.
- Improved therapeutic strategies are needed for advanced HCM with systolic dysfunction and dilatation.
Abstract:
The history of an 18-year-old male with hypertrophic cardiomyopathy (HCM) and ventricular dilatation is presented and the literature on systolic dysfunction and ventricular dilatation in patients with HCM is statistically analyzed in search of risk factors. The patient was followed for 7 years when he developed recurrent ventricular fibrillation, left ventricular dilatation and low cardiac output. An automatic cardioverter-defibrillator was implanted but the patient died of electro-mechanical dissociation. In order to define risk factors for systolic dysfunction and ventricular dilatation in HCM, the literature data of 17 patients with this complication were compared to a group of 139 consecutive patients with HCM from our hospital. The risk factors identified were a more markedly increased septal (20.1 vs. 18.0 mm, P < 0.05) and posterior wall thickness (13.6 vs. 11.0 mm, P < 0.001) in the patients subsequently developing systolic dysfunction and ventricular dilatation, whereas age, sex and the ratio between septal and posterior wall thickness were not significantly different between the two groups. A severely increased ventricular mass appears to be a risk factor for the development of systolic dysfunction with ventricular dilatation in HCM. Prognosis is usually poor and the reported case showed fatal ventricular arrhythmia despite the implantation of an automatic cardioverter-defibrillator.