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 +2  (nbme21#5)

PDA flows from the Aorta ==> Pulmonary arteries, by passing the RV so there is no change in O2 in the RV.

felxordigitorum  The "steal" from the aorta during diastole requires increased cardiac output to compensate. Extremely premature infants have limited ability to increase stroke volume and thus use increased heart rate to increase cardiac output. https://www.ncbi.nlm.nih.gov/books/NBK430758/

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