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)".