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Good prognosis for dilated cardiomyopathy without severe heart failure or arrhythmia
R A Stewart1, W J McKenna, C M Oakley
1Department of Medicine, Hammersmith Hospital, Royal Postgraduate Medical School, London.
Insights
Dilated cardiomyopathy patients with mild symptoms generally fare well. However, hidden ventricular arrhythmias significantly increase the risk of sudden cardiac death, even without severe heart failure symptoms.
Area of Science:
- Cardiology
- Clinical Medicine
- Heart Disease Research
Background:
- Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
- Prognostic factors in DCM require further elucidation.
- Understanding risk stratification is crucial for patient management.
Purpose of the Study:
- To investigate the relationship between initial symptoms of heart failure and ventricular arrhythmia and the long-term outcomes in patients with DCM.
- To determine the prognostic value of symptom severity and ventricular ectopy on mortality and sudden death.
Main Methods:
- Life table analysis was employed to assess outcomes in 124 DCM patients.
- Data collected included heart failure symptoms (NYHA class) and ventricular arrhythmias.
- Outcomes were tracked for a mean of 43 months.
Main Results:
- Two-year mortality from progressive heart failure was 59% for class 3 symptoms, 6% for class 2, and 0% for class 1.
- Two-year mortality from sudden death was 18% for class 3, 8% for class 2, and 7% for class 1 symptoms.
- Ventricular tachycardia or frequent ectopics independently increased sudden death risk (15% vs. 3% at two years).
Conclusions:
- Mildly symptomatic DCM patients often have a favorable prognosis.
- Occult ventricular arrhythmias represent a critical risk factor for sudden death in DCM.
- Risk stratification should consider both heart failure severity and the presence of ventricular arrhythmias.
Abstract:
In 124 patients with dilated cardiomyopathy, symptoms of heart failure and ventricular arrhythmia at initial assessment were related to outcome a mean of 43 months later. Using life table analysis, the two-year mortality from progressive heart failure was 59 per cent (90 per cent symptoms, six per cent (1-11 per cent) for patients with class 2 symptoms and zero for patients with class 1 symptoms. The two-year mortality from sudden death was 18 per cent (5-32 per cent) for patients with class 3 symptoms, eight per cent (3-14 per cent) for patients with class 2 symptoms and seven per cent (0-17 per cent) for patients with class 1 symptoms. Sudden death was more frequent in patients with ventricular tachycardia or frequent ventricular ectopics, irrespective of the severity of heart failure (15 per cent (7-23 per cent) vs. three per cent (0-8 per cent) at two years). These findings suggest that patients with dilated cardiomyopathy and mild symptoms often have a benign clinical course. However, occult ventricular arrhythmia is associated with an increased risk of sudden death.