Sustained inflation reduces pulmonary blood flow during resuscitation with an intact cord

Jayasree Nair, Lauren Davidson, Sylvia Gugino, Carmon Koenigsknecht, Justin Helman, Lori Nielsen, Deepika Sankaran, Vikash Agrawal, Praveen Chandrasekharan, Munmun Rawat, Sara K. Berkelhamer, Satyan Lakshminrusimha

Research output: Contribution to journalArticlepeer-review


The optimal timing of cord clamping in asphyxia is not known. Our aims were to determine the effect of ventilation (sustained inflation–SI vs. positive pressure ventilation–V) with early (ECC) or delayed cord clamping (DCC) in asphyxiated near-term lambs. We hypothesized that SI with DCC improves gas exchange and hemodynamics in near-term lambs with asphyxial bradycardia. A total of 28 lambs were asphyxiated to a mean blood pressure of 22 mmHg. Lambs were randomized based on the timing of cord clamping (ECC—immediate, DCC—60 s) and mode of initial ventilation into five groups: ECC + V, ECC + SI, DCC, DCC + V and DCC + SI. The magnitude of placental transfusion was assessed using biotinylated RBC. Though an asphyxial bradycardia model, 2–3 lambs in each group were arrested. There was no difference in primary outcomes, the time to reach baseline carotid blood flow (CBF), HR ≥ 100 bpm or MBP ≥ 40 mmHg. SI reduced pulmonary (PBF) and umbilical venous (UV) blood flow without affecting CBF or umbilical arterial blood flow. A significant reduction in PBF with SI persisted for a few minutes after birth. In our model of perinatal asphyxia, an initial SI breath increased airway pressure, and reduced PBF and UV return with an intact cord. Further clinical studies evaluating the timing of cord clamping and ventilation strategy in asphyxiated infants are warranted.

Original languageEnglish (US)
Article number353
Issue number5
StatePublished - May 2021


  • Delayed cord clamping
  • Perinatal asphyxia
  • Placental transfusion
  • Pulmonary blood flow
  • Sustained inflation

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health


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