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Thank you for your interest in our study and your comment. When you read the 6th paragraph of the discussion of the article, you will find that we completely agree that Oxytocin could have influenced the observations. This was an observational study and moment of oxytocin was given to the discretion of the midwife. Nevertheless, we still observed umbilical circulation much longer than previously described. This study was performed in 2015, but our local guideline has recently been changed to administering oxytocin after cord clamping. A new study is currently undertaken using the same methodology.
Thank you for this interesting and highly needed piece of knowledge on physiological umbilical bllod flow. Just one remark: uterotonics were given to all women directly after birth. Oxytocin may alter umbilical blood flow due to modifications in timing and strength of contractions, and influence timing of placental disattachment. Possibly, true physiological blood flow may be still different (and continue for even longer), if medication were administered after clamping (quite possibly with no significant disadvantage for the parturient).