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[Left bundle-branch block: inferences from ventricular septal motion in the echocardiogram concerning left
Zeitschrift Fur Kardiologie
|November 1, 1983
Summary
In left bundle branch block (LBBB), distinct interventricular septum (IVS) motions identified via M-mode echocardiography correlate with disease severity. Paradoxical IVS motion indicates a more advanced clinical stage and poorer outcomes.
Area of Science:
- Cardiology
- Medical Imaging
- Physiology
Context:
- Left bundle branch block (LBBB) is associated with abnormal interventricular septum (IVS) motion.
- M-mode echocardiography is a key diagnostic tool for assessing cardiac function.
Purpose:
- To determine if distinct patterns of IVS motion in LBBB patients can be identified using M-mode echocardiography.
- To investigate the correlation between these IVS motion patterns and clinical data.
Summary:
- Analyzed M-mode echocardiograms of 100 LBBB patients, identifying three IVS motion types: anterior (paradoxical, Type A), posterior (normal, Type B), and intermediate (Type AB).
- Type A (18%) showed more severe disease, longer QRS duration, larger cardiac-thoracic ratio, and larger left ventricular end-diastolic diameters compared to Type B (58%).
- Type A also had lower ejection fraction and higher mean pulmonary artery pressure, with 88% of Types A and AB exhibiting abnormal pulmonary artery pressure.
Impact:
- M-mode echocardiography can differentiate IVS motion patterns in LBBB, offering prognostic information.
- These patterns correlate with disease severity, ventricular function, and pulmonary artery pressures.
- Findings aid in risk stratification and management of LBBB patients.