What is the role of pulse oximetry and arterial blood gas (ABG) in the workup of patent ductus arteriosus (PDA)?

Updated: Nov 20, 2018
  • Author: Luke K Kim, MD; Chief Editor: Stuart Berger, MD  more...
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Answer

Pulse oximetry/arterial blood gas (ABG) analysis usually demonstrate normal saturation because of pulmonary overcirculation. A large ductus arteriosus could cause hypercarbia and hypoxemia from congestive heart failure (CHF) and air space disease (atelectasis or intra-alveolar fluid/pulmonary edema).

In the event of pulmonary artery hypertension (PAH), right-to-left intracardiac shunting of blood, hypoxemia, cyanosis, and acidemia may be present.


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