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[Complete branch blocks in asymptomatic patients]
Insights
Complete bundle branch blocks in asymptomatic individuals rarely progress to complete A-V block before age 50. Isolated blocks without cardiovascular disease show an excellent long-term prognosis, with prolonged survival documented.
Area of Science:
- Cardiology
- Electrophysiology
- Internal Medicine
Context:
- Bundle branch blocks (BBBs) are a common finding in electrocardiography.
- Asymptomatic subjects with BBBs require careful evaluation for prognostic indicators.
- The natural history of asymptomatic BBBs is not fully understood.
Purpose:
- To evaluate the long-term prognosis of asymptomatic complete bundle branch blocks.
- To determine the progression rate of BBBs to complete atrioventricular (A-V) block.
- To identify factors associated with favorable outcomes in patients with BBBs.
Summary:
- This study reviewed international literature and personal experience regarding complete bundle branch blocks in asymptomatic individuals.
- Results indicate that complete BBBs rarely progress to complete A-V block before age 50.
- Isolated right or left BBBs without evident cardiovascular disease are associated with an excellent long-term prognosis, with documented survival of 20–40 years.
Impact:
- Provides crucial information for managing asymptomatic patients with bundle branch blocks.
- Suggests that isolated BBBs in the absence of other cardiac pathology may not necessitate aggressive intervention.
- Highlights the generally favorable long-term outlook for a significant subset of patients diagnosed with BBBs.
Abstract:
Basing themselves on their personal experience and a review of the international literature, the authors study complete bundle branch blocks in asymptomatic subjects. They show that before the age of 50 these complete bundle branch blocks rarely progress towards a complete A-V block. They emphasise the excellent prognosis in the long term for isolated right or left blocks without obvious signs of cardiovascular disease and they cite cases of prolonged survival (20 to 40 years after discovery of the bundle branch block).