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Intraventricular conduction disturbances in flying personnel: right bundle branch block
Insights
Complete right bundle branch block (CRBBB) in healthy pilots is uncommon. While often progressive, CRBBB may not affect the electrical axis, and prognosis depends on underlying conditions, allowing waivers for flying with monitoring.
Area of Science:
- Cardiology
- Aerospace Medicine
- Electrocardiography
Background:
- Complete right bundle branch block (CRBBB) is a cardiac conduction abnormality.
- Understanding CRBBB in asymptomatic, healthy populations, particularly aviators, is crucial for safety and qualification.
- Prevalence of CRBBB in civil flying male individuals was assessed.
Purpose of the Study:
- To investigate the evolutive characteristics and qualification criteria for CRBBB in male civil flying individuals.
- To determine the prevalence and potential underlying causes of CRBBB in this specific cohort.
- To assess the implications of CRBBB for flying fitness and the need for periodic electrocardiogram (ECG) monitoring.
Main Methods:
- Retrospective analysis of 41 cases of CRBBB identified in a population of 6,915 male civil flying individuals.
- Review of initial and subsequent electrocardiograms (ECGs) to track the development and progression of CRBBB.
- Correlation of CRBBB findings with clinical data, including the development of other cardiovascular or non-cardiovascular diseases.
Main Results:
- The prevalence of CRBBB was 5.9 per 1,000 individuals.
- In 50% of cases where CRBBB developed after a normal ECG, an incomplete right bundle branch block (IRBBB) preceded it, suggesting progressive compromise.
- CRBBB development did not alter the electrical axis in 75% of cases; associated conditions included hypertension, coronary heart disease, and mitral valve prolapse.
Conclusions:
- The etiology of CRBBB in asymptomatic individuals remains uncertain.
- Prognosis is contingent upon any underlying conditions; individuals without significant risk factors may be cleared for flying activities.
- Periodic ECG monitoring is recommended for individuals with CRBBB cleared for flying duties.
Abstract:
The evolutive characteristics, as well as the qualification criteria, applied to 41 cases of complete right bundle branch block (CRBBB), detected in a presumably healthy population composed of 6,915 male individuals performing civil flying activities (prevalence = to 5.9 per 1,000) were studied. In 17 cases, the CRBBB was detected in the first electrocardiogram (ECG). In 24 cases, the CRBBB appeared after normal ECGs; the CRBBB development did not change the electrical axis in 75%, and in 50% of them an incomplete right bundle branch block (IRBBB) appeared first, suggesting a progressive compromise of the right bundle branch. One case developed arterial hypertension and coronary heart disease, another one mitral valve prolapse, and there were two cases of non-cardiovascular diseases. The CRBBB etiology in asymptomatic individuals is uncertain. The prognosis depends on the underlying disease. Once those etiologies which by themselves imply a future risk are ruled out, they may be waivered for flying activities with periodical ECG controls.