vagal bradycardia

va·gal bra·dy·car·di·a

any excessive cardiac slowing due to stimulation of the vagus nerves.
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References in periodicals archive ?
Basic research showed that NPY could antagonize vagal bradycardia by stimulating presynaptic Y2 receptors on cardiac vagal nerve terminals and inhibit the release of the neurotransmitter acetylcholine.[12] Therefore, it can be speculated that the low plasma NPY levels in children with VVS may not antagonize the effect of the high vagal tone on HR, which leads to a relatively slow HR.
Vagal bradycardia produced by microinjections of morphine-like drugs into the nucleus ambiguus in anaesthetized dogs.