The blood flow through the patent ductus arteriosus creates a continuous murmur that exists in both systole and diastole.
This murmur is classically described as having a machine-like quality due to continuous clicking noises. Important to note that while the machine-like murmur is often the hallmark sign, a systolic ejection murmur may also be heard.
Patent ductus arteriosus is a common outcome of congenital Rubella infection close to delivery. However, the frequency of PDA caused by congenital Rubella has significantly decreased due to immunization.
In premature infants, the patent ductus arteriosus closes later than it would in term babies, possibly related to the relative immaturity of the lungs.
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