First degree AV block history and symptoms

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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] Ahmed Elsaiey, MBBCH [3]


Symptoms related to atrioventricular block vary and related to the degree of atrioventricular block, the ventricular rate, and the frequency of its occurrence. Patients presented with First-degree AV block are usually asymptomatic. However, severe first-degree AV block may cause symptoms similar to pace maker syndrome including heart failure symptoms, exertional intolerance. Pseudo pacemaker syndrome is defined when the PR interval is >300ms leading to atrial contraction during the closed atrioventricular valves, loss of atrioventricular synchrony and decrease in cardiac output and an increase pulmonary capillary wedge pressure.

History and symptoms




  1. 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.
  2. Ando', Giuseppe; Versaci, Francesco (2005). "Ventriculo-atrial gradient due to first degree atrio-ventricular block: a case report". BMC Cardiovascular Disorders. 5 (1). doi:10.1186/1471-2261-5-23. ISSN 1471-2261.

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