How is patent ductus arteriosus (PDA) defined?

Updated: Nov 20, 2018
  • Author: Luke K Kim, MD; Chief Editor: Stuart Berger, MD  more...
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Cassels et al defined true persistence of the ductus arteriosus as a patent ductus arteriosus (PDA) present in infants older than 3 months. [2] Thus, patency after 3 months is considered abnormal, and treatment should be considered at this juncture, although urgency is seldom necessary. Some canine breeds, such as certain strains of poodle, have a large prevalence of patent ductus arteriosus (PDA).

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