Discussion
We report a novel finding in marijuana induced bradyarrythmia. Reversible high grade atrioventricular (AV) block with electrophysiologic determination of site of conduction blockade is not reported previously. The mechanism of bradyarrythmia is thought to be mediated by increased vagal tone. However direct toxic effects of Δ9-tetrahydrocannabinol (THC), through cannabinoid receptors 1(CB1R ) on the cardiac conduction system cannot be ruled out.