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[The electrocardiogram in dilated cardiomyopathy]
Insights
Electrocardiograms (ECG) are highly sensitive in detecting dilated cardiomyopathy, often appearing as the first disease sign. Abnormal ECG findings, particularly conduction delays, indicate a worse prognosis in these patients.
Area of Science:
- Cardiology
- Medical Diagnostics
Context:
- Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
- Early diagnosis and prognostic assessment are crucial for managing DCM.
Purpose:
- To investigate the diagnostic and prognostic value of electrocardiography (ECG) in patients with dilated cardiomyopathy.
- To correlate ECG findings with disease severity and patient outcomes.
Summary:
- All 80 patients with dilated cardiomyopathy exhibited abnormal ECGs, with 25% showing it as the initial disease manifestation.
- Common abnormalities included left atrial enlargement (47.5%), left bundle branch block (41.2%), and prolonged PR interval (27.5%).
- Increasing left ventricular conduction delays and leftward QRS axis shifts during follow-up were associated with a worse prognosis.
Impact:
- ECG is a sensitive, albeit nonspecific, tool for assessing myocardial impairment in DCM.
- ECG findings can aid in defining a prognostic profile for patients with dilated cardiomyopathy.
- Identifying conduction delays on ECG may help predict outcomes in DCM patients.
Abstract:
The electrocardiogram (ECG) of 80 patients with dilated cardiomyopathy was studied. An abnormal ECG was present in 100% of our patients, and in 25% it was the first sign of the disease. Thirty-eight cases (47.5%) showed left atrial enlargement, 22 (27.5%) prolonged PR interval, 33 (41.2%) left bundle branch block, 15 (18.7%) abnormal Q waves, 9 (11.2%) primary S-T and T changes. There were significant differences in ejection fraction and in left ventricular end-diastolic volume between patients with right bundle branch block (p less than 0.05 and p = 0.05 respectively). Patients were followed for a period of 29.5 +/- 28.8 months (min. 2 days, max. 10 years): during the observation period the ECG showed in 28 cases an increasing left ventricular conduction delay and a leftward shifting of mean QRS axis. Patients with left ventricular conduction delays showed a worse prognosis. ECG in dilated cardiomyopathy is a nonspecific but sensitive tool, which may be related to different degrees of myocardial impairment and may be useful in the definition of a prognostic profile.