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• W4225085229 abstract "Abstract A current view that delayed cord clamping (DCC) results in greater haemodynamic stability at birth than immediate cord clamping (ICC) is based on comparison of DCC vs . ICC followed by an asphyxial (∼2 min) cord clamp‐to‐ventilation (CC–V) interval. More recent data suggest that relatively minor perinatal differences in heart rate and blood pressure fluctuations exist between DCC and ICC with a non‐asphyxial (<45 s) CC–V interval, but it is unknown how ventricular output and central arterial blood flow effects of DCC compare with those of non‐asphyxial ICC. Anaesthetized preterm fetal lambs instrumented with flow probes on major central arteries were ventilated for 97 (7) s (mean (SD)) before DCC at birth ( n = 10), or underwent ICC 40 (6) s before ventilation ( n = 10). Compared to ICC, initial ventilation and DCC was accompanied by (1) redistribution of a similar level of ascending aortic flow away from cephalic arteries and towards the aortic isthmus after ventilation; (2) a lower right ventricular output after cord clamping that was redistributed towards the lungs, thereby maintaining the absolute contribution of this output to a similar increase in pulmonary arterial flow after birth; and (3) a lower descending thoracic aortic flow after birth, related to a more rapid decline in phasic right‐to‐left ductal flow only partially offset by increased aortic isthmus flow. However, systemic arterial flows were similar between DCC and non‐asphyxial ICC within 5 min after birth. These findings suggest that compared to non‐asphyxial ICC, initial ventilation with DCC transiently redistributed central arterial flows, resulting in lower perinatal systemic arterial, but not pulmonary arterial, flows. Key points A current view that delayed cord clamping (DCC) results in greater haemodynamic stability at birth than immediate cord clamping (ICC) is based on comparison of DCC vs . ICC with an asphyxial (∼2 min) cord clamp‐to‐ventilation (CC–V) interval. Recent data suggest that relatively minor perinatal differences in heart rate and blood pressure fluctuations exist between DCC and ICC with a non‐asphyxial (<45 s) CC–V interval, but how central arterial blood flow effects of DCC compare with those of non‐asphyxial ICC is unknown. Anaesthetized preterm fetal lambs instrumented with central arterial flow probes underwent initial ventilation for ∼90 s before DCC at birth, or ICC for ∼40 s before ventilation. Compared to non‐asphyxial ICC, initial ventilation with DCC redistributed central blood flows, resulting in lower systemic, but not pulmonary, arterial flows during this period of transition. This flow redistribution was transitory, however, with systemic arterial flows similar between DCC and non‐asphyxial ICC within minutes after birth." @default.
• W4225085229 created "2022-04-30" @default.
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• W4225085229 date "2022-05-10" @default.
• W4225085229 modified "2023-10-18" @default.
• W4225085229 title "Divergent effects of initial ventilation with delayed cord clamping on systemic and pulmonary arterial flows in the birth transition of preterm lambs" @default.
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• W4225085229 doi "https://doi.org/10.1113/jp282934" @default.
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