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Electrocardiographic characteristics at initial diagnosis in patients with isolated left ventricular noncompaction
Jan Steffel1, Richard Kobza, Erwin Oechslin
1Department of Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland.
Insights
Electrocardiograms in isolated ventricular noncompaction (IVNC) often show conduction delays and hypertrophy, but no specific patterns were identified. These ECG findings may correlate with clinical features like heart failure and embolic events.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Diagnostics
Background:
- Isolated ventricular noncompaction (IVNC) is a primary cardiomyopathy with distinct morphological features.
- Patients with IVNC are at risk for serious complications including ventricular arrhythmias, heart failure, and embolic events.
Purpose of the Study:
- To analyze the electrocardiographic (ECG) patterns in patients newly diagnosed with IVNC.
- To investigate the correlation between ECG findings and clinical/echocardiographic features in IVNC patients.
Main Methods:
- Retrospective analysis of ECGs from 78 patients diagnosed with IVNC between March 1995 and November 2008.
- Correlation of ECG findings with clinical data and echocardiographic results.
Main Results:
- Common ECG findings included intraventricular conduction delay (especially left bundle branch block), left ventricular hypertrophy (LVH) voltage, and repolarization abnormalities.
- A normal ECG was observed in 13% of patients; no ECG pattern was uniquely specific for IVNC.
- Intraventricular conduction delay, atrial conduction delay, and QTc prolongation correlated with reduced LV systolic function and chamber dilation.
- ECG signs of LVH were associated with a higher incidence of systemic embolic events.
Conclusions:
- While common ECG abnormalities exist in newly diagnosed IVNC, no specific diagnostic pattern was identified.
- The study highlights correlations between ECG findings, cardiac function, and embolic risk in IVNC.
- Further long-term studies are needed to determine the prognostic implications of these ECG findings.
Abstract:
Isolated ventricular noncompaction (IVNC) is a primary cardiomyopathy characterized by a specific morphologic pattern. Patients with IVNC can develop various arrhythmic complications such as life-threatening ventricular arrhythmias, as well as heart failure or systemic embolic events. The present study was designed to comprehensively analyze the electrocardiographic (ECG) pattern at the initial diagnosis in patients with IVNC and to investigate their correlation with the clinical features and echocardiographic findings. Electrocardiograms from the initial diagnosis of IVNC were available for 78 patients from March 1995 to November 2008. The most common findings were intraventricular conduction delay (especially left bundle branch block), voltage signs of left ventricular (LV) hypertrophy, and repolarization abnormalities. An entirely normal electrocardiogram was present in 10 subjects (13%). However, no ECG findings or patterns specific for IVNC were found. A striking overlap was observed between the presence of intraventricular conduction delay (left bundle branch block, in particular), atrial conduction delay (PR interval prolongation or atrioventricular block), and prolongation of the QTc and reduced systolic LV function and LV/left atrial dilation. Moreover, patients with ECG voltage signs of LV hypertrophy more often presented with, or had a history of, systemic embolic events. In conclusion, our results have provided a comprehensive analysis of ECG findings of patients newly diagnosed with IVNC. Although intraventricular conduction delay, repolarization abnormalities, and LV hypertrophy are frequently present, no ECG patterns specific for IVNC at the first presentation with the disease were found. Whether these findings have prognostic implications needs to be investigated in long-term controlled studies.
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