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Intravenous adenosine is a simple test that can uncover latent preexcitation via an accessory pathway and is useful in the diagnostic workup of sudden cardiac arrest survivors without an identifiable cause. Latent preexcitation is usually associated with left free wall pathways but may also occur in right‐sided accessory pathways with slow antegrade conduction. Although intermittent ECG evidence of preexcitation is generally considered a marker of low risk for sudden death, if this is due to an accessory pathway with long atrioventricular conduction time and short effective refractory period (rather than true intermittent conduction via the pathway), the risk for sudden death may be equal to those accessory pathways with manifest preexcitation.

Unmasking latent preexcitation of a right‐sided accessory pathway with intravenous adenosine after unexplained sudden cardiac arrest.