For
patients with a transplanted heart, is it necessary to administer
anticholinergics when antagonizing neuromuscular blockade?
While bradycardia is unlikely following the administration of an acetylcholinesterase inhibitor (e.g., neostigmine) to a post-cardiac transplantation patient, the usual
muscarinic blockers (e.g., glycopyrrolate) should be given concurrently to
prevent noncardiac cholinergic side-effects (e.g., bron-chospasm). Another
reason to provide an anticholinergic is that significantly increased levels of
acetylcholine can cause coronary vasospasm in the denervated heart. While there
is some evidence that neostigmine has direct effects on the myocardium, and
there are a few case reports of bradycardia following neostigmine
administration in this population, it should not deter one from reversing
neuromuscular block-ade when appropriate because prolonged intubation may
predispose to pulmonary infection.
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