Patent Ductus Arteriosus (PDA) occurs when the ductus arteriosius fails to close after birth, resulting in blood shunting from circulation to the pulmonary artery. In most pets the increased in oxygen tension in the blood at birth results in the closure of this duct within 12 to 14 hours. If the duct remains open the heart will begin to fluid overload, resulting in a heart murmur. PDA is a congenital defect and is most common in chihuahuas, maltese, poodles, pomeranians, collies, cocker spaniels, bichons frises, and springer spaniels.
Clinical signs of PDA are cardiac murmurs, with some puppies being asymptomatic.
A PDA may be initially suspected by your veterinarian during a general puppy wellness examination if a murmur is noted. Confirmation of a PDA is done via radiograms and echocardiogram.
Treatment for PDA is surgical correction performed before 1-2 years of age.
Prognosis is excellent with surgical correction; however, if left untreated estimated survival time is 1-3 years.
It is important to note that if a patient has been diagnosed with a PDA the dog should not be used for breeding.