Left Anterior Hemiblock (LAH)--Diagnosis and Aeromedical Risk,
Abstract
Eighteen US Army initial flight applicants and trained aircrew were evaluated for the electrocardiographic diagnosis of left anterior hemiblock (LAH). This diagnosis was sustained in 50% by the addition of vectorcardiographic criteria. With computer processing and calculation of delay of the intrinsicoid deflection (ID) of the high lateral left ventricular activation time, the diagnosis was sustained in 50% of those records available. Review of the etiology, histopathology, and prognosis indicates definitive abnormalities of the trifascicular left bundle branch conduction system. It is essential a complete electrocardiogram (ECG) and vectorcardiogram (VCG) study of military aircrew be obtained to establish the diagnosis of true LAH. The incidence of true LAH is not available but the rarity of this finding with an unknown risk should preclude entry into military flight training. Complete cardiovascular evaluation of the trained airman with acquired LAH should include electrophysiologic studies and selective coronary arteriography and vertriculography prior to consideration for return to full flying duties. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1977
- Accession Number
- ADA047428
Entities
People
- Frank S. Pettyjohn
- Heber D. Jones
- John C. Kelliher
- Joseph C. Denniston
- Lloyd A. Akers
Organizations
- United States Army Aeromedical Research Lab