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Heart murmurs are common in children. As a presenting sign they are usually
heard during a routine examination or during an intercurrent infection.
When heard during the the neonatal
examination they are most frequently due to a closing
patent ductus arteriosus or to mild
stenosis at the origin of the left pulmonary. Aortic or pulmonary stenosis
(including that associated with tetralogy of Fallot) may also present in
this way.
In the older child most murmurs are "innocent" and if they exhibit all the
clinical characteristics then further investigation is unnecessary.
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