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Systemic and cerebral blood flow
  1. C M Kissack,
  2. S P Wardle,
  3. A M Weindling
  1. Neonatal Unit, Liverpool Women’s Hospital, Liverpool, UK;

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    We read with interest the findings of Evans et al concerning the changes in middle cerebral artery (MCA) haemodynamics over the first two days after birth in preterm infants.1

    Evans et al demonstrated a significant change in several Doppler velocity measures in the MCA, including systolic, diastolic, and mean velocity, pulsatility index and velocity time integral, during days 1 and 2 after birth in a cohort of preterm infants. Blood flow (F), blood pressure (P), and vascular resistance (R) are closely related (F = P/R), and resistance changes are …

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