Why the study?
Does constitutive overexpression of muscarinic receptors lead to vagal hyperreactivity in a rabbit model?
Does constitutive overexpression of muscarinic receptors lead to vagal hyperreactivity in a rabbit model?
This preclinical study investigates whether muscarinic receptor overexpression is the underlying mechanism of vagal hyperreactivity, which has implications for Sudden Infant Death Syndrome and vasovagal syncope.
Findings remain preclinical and do not alter SIDS or syncope management; leaves open muscarinic overexpression as driver of vagal hyperreactivity.
Background: Alterations in muscarinic receptor expression and acetylcholinesterase (AchE) activity have been observed in tissues from Sudden Infant Death Syndrome (SIDS). Vagal overactivity has been proposed as a possible cause of SIDS as well as of vasovagal syncopes. The aim of the present study was to seek whether muscarinic receptor overexpression may be the underlying mechanism of vagal hyperreactivity. Rabbits with marked vagal pauses following injection of phenylephrine were selected and crossed to obtain a vagal hyperreactive strain. The density of cardiac muscarinic receptors and acetylcholinesterase (AchE) gene expression were assessed. Blood markers of the observed cardiac abnormalities were also sought.
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Livolsi et al. (2011) studied this question.
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