AVNRT laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Ramyar Ghandriz MD[2]

Overview

Patients presenting AVNRT must be checked for thyroid function, serum electrolytes, and cardiac markers.

Laboratory Findings

Depending upon the patient's history and demographics, the following laboratory studies should be considered:

• Thyroid function tests (TFTs) - an overactive thyroid may increase the risk of AVNRT
• Electrolytes - hypokalemia, hypomagnesemia may predispose to AVNRT
• Cardiac markers - if there is a concern that myocardial infarction (a heart attack) has occurred either as a cause or as a result of the AVNRT; this is usually only the case if the patient has experienced ischemic chest pain