Paroxysmal AV block Laboratory Findings and Stimulation tests
Laboratory Investigations and stimulation tests
- Adenosine plasma levels (APL) and Adneosine Triphosphate (ATP)stimulation tests are tests of value in extrinsic idiopathic AV Block.
- As previously discussed, APL levels are innately low in patients with EI AVB and therefore, on injection of ATP, AV blocks maybe reproduced.
- Other lab investigations such as arterial blood gas analysis, hemoglobin, troponin or D- dimer may help with the diagnoses in appropriate clinical situations. "ESC Guidelines on Syncope (Diagnosis and Management of)".
2018 ACC/AHA/HRS Guideline on the Evaluation and Management of Patients With Bradycardia and Cardiac Conduction Delay: Recommendation for Laboratory Testing
| Recommendation for Laboratory Testing |
| "1. In patients with bradycardia, laboratory tests (eg, thyroid function tests, Lyme titer, potassium, pH) based on clinical suspicion
for a potential underlying cause are reasonable (Level of Evidence: C-LD)[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: Executive Summary: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines, and the Heart Rhythm Society". J Am Coll Cardiol. 74 (7): 932–987. doi:10.1016/j.jacc.2018.10.043. PMID 30412710.