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Newly acquired left bundle-branch block: the Framingham study
Insights
Newly acquired left bundle-branch block (LBBB) often signals underlying heart disease. This condition significantly increases the risk of developing coronary disease, heart failure, and cardiovascular death.
Area of Science:
- Cardiology
- Clinical Medicine
- Epidemiology
Background:
- Left bundle-branch block (LBBB) is a recognized electrocardiographic finding.
- Its prognostic significance, particularly when newly acquired, requires further elucidation.
Purpose of the Study:
- To prospectively examine the clinical implications and long-term outcomes of newly acquired left bundle-branch block (LBBB).
Main Methods:
- Prospective observational study within the Framingham Study population.
- Long-term follow-up (18 years) of individuals who developed new-onset LBBB.
- Comparison with age- and sex-matched control subjects without LBBB.
Main Results:
- Newly acquired LBBB occurred in 55 individuals, with a mean age of 62.
- LBBB was associated with antecedent hypertension, cardiac enlargement, and coronary heart disease.
- 48% developed new coronary disease or congestive failure post-LBBB onset.
- Within 10 years, 50% of individuals with new LBBB died from cardiovascular diseases.
- LBBB independently increased cardiovascular mortality risk in men.
Conclusions:
- Newly acquired LBBB is a marker of advanced hypertensive or ischemic heart disease.
- It portends a poor prognosis with high rates of subsequent cardiovascular events and mortality.
- Early identification and management of underlying cardiovascular conditions are crucial in patients with new LBBB.
Abstract:
The clinical implications of newly acquired left bundle-branch block (LBBB) were examined prospectively in the Framingham Study population. During 18 years of observation 55 people developed LBBB. The mean age at the onset of LBBB was 62; LBBB occurred largely in people with antecedent hypertension, cardiac enlargement, coronary heart disease, or a combination of these. Coincident with or subsequent to the onset of LBBB, 48% developed clinical coronary disease or congestive failure for the first time. Throughout the entire period of observation only 11% remained free of clinically apparent cardiovascular abnormalities. Within 10 years of the onset of LBBB, 50% had died from cardiovascular diseases. In men, the appearance of LBBB contributed independently to an increased risk of cardiovascular disease mortality. Comparison with age- and sex-matched control subjects free from LBBB confirmed that in the general adult population, newly acquired LBBB is most often a hallmark of advanced hypertensive or ischemic heart disease, or both.
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