Bradycardia laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

Some patients with bradycardia may have elevated/reduced concentration of electrolyte levels, glucose level, calcium level, magnesium level, thyroid function tests, toxicologic screen and troponin.

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[1]

Recommendation for Laboratory Testing in Patients With Documented or Suspected Bradycardia or Conduction Disorders

Class IIa
1.In patients with bradycardia, laboratory tests (e.g., thyroid function tests, Lyme titer, potassium, pH) based on clinical suspicion for a potential underlying cause are reasonable.(Level of Evidence: C-LD)

Laboratory findings

Laboratory findings consistent with the diagnosis of bradycardia include:[2]

References

  1. Kusumoto FM, Schoenfeld MH, Barrett C, Edgerton JR, Ellenbogen KA, Gold MR; et al. (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): e382–e482. doi:10.1161/CIR.0000000000000628. PMID 30586772.
  2. "StatPearls". 2020. PMID 29630253.