Third degree AV block screening

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sara Zand, M.D.[2] Soroush Seifirad, M.D.[3] Aditya Ganti M.B.B.S. [4]


Ambulatory electrocardiographic monitoring is useful for finding intermittent atrioventricular block, LBBB and bifascicular block in asymptomatic patients. In patients with symptomatic atrioventricular block or bradycardia during sleep, screening about sleep apnea is recommended.


Recommendations for screening sleep apnea in patients with bradycardia or conduction disorder
(Class I, Level of Evidence B):

❑ Screening about sleep apnea syndrome is recommended In patients with documented or suspected bradycardia or conduction disorder during sleep
Continuous airway pressure and weight loss is recommended in patients with bradycardia or conduction disorder during sleep and documented obstructive sleep apnea

(Class IIa, Level of Evidence B):

❑ In patients with previously PPM implantation for bradycardia or conduction disorder, screening about sleep apnea syndrome is reasonable

The above table adopted from 2018 AHA/ACC/HRS Guideline[3]


  1. Kasai, Takatoshi; Floras, John S.; Bradley, T. Douglas (2012). "Sleep Apnea and Cardiovascular Disease". Circulation. 126 (12): 1495–1510. doi:10.1161/CIRCULATIONAHA.111.070813. ISSN 0009-7322.
  2. Clowse MEB, Eudy AM, Kiernan E, Williams MR, Bermas B, Chakravarty E; et al. (2018). "The prevention, screening and treatment of congenital heart block from neonatal lupus: a survey of provider practices". Rheumatology (Oxford). 57 (suppl_5): v9–v17. doi:10.1093/rheumatology/key141. PMC 6099126. PMID 30137589.
  3. Kusumoto, Fred M.; Schoenfeld, Mark H.; Barrett, Coletta; Edgerton, James R.; Ellenbogen, Kenneth A.; Gold, Michael R.; Goldschlager, Nora F.; Hamilton, Robert M.; Joglar, José A.; Kim, Robert J.; Lee, Richard; Marine, Joseph E.; McLeod, Christopher J.; Oken, Keith R.; Patton, Kristen K.; Pellegrini, Cara N.; Selzman, Kimberly A.; Thompson, Annemarie; Varosy, Paul D. (2019). "2018 ACC/AHA/HRS Guideline on the Evaluation and Management of Patients With Bradycardia and Cardiac Conduction Delay: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society". Circulation. 140 (8). doi:10.1161/CIR.0000000000000628. ISSN 0009-7322.

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