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American Academy of Pediatrics
Article

Cerebral Blood Flow Is Independent of Mean Arterial Blood Pressure in Preterm Infants Undergoing Intensive Care

Lidia Tyszczuk, Judith Meek, Clare Elwell and J. S. Wyatt
Pediatrics August 1998, 102 (2) 337-341; DOI: https://doi.org/10.1542/peds.102.2.337
Lidia Tyszczuk
From the *Department of Paediatrics, University College London School of Medicine; and the
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Judith Meek
From the *Department of Paediatrics, University College London School of Medicine; and the
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Clare Elwell
‡Department of Medical Physics and Bioengineering, University College London, London, England.
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J. S. Wyatt
From the *Department of Paediatrics, University College London School of Medicine; and the
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Abstract

Objective. Preterm infants are often presumed to have a pressure passive cerebral circulation implying that a low mean arterial blood pressure (MABP) results in reduced cerebral perfusion. The aim of this study was to determine whether cerebral blood flow (CBF) was compromised in preterm infants whose MABP fell below 30 mm Hg (4 kPa).

Methods. Thirty preterm infants undergoing intensive care were studied within the first 24 hours of life. CBF was measured using near infrared spectroscopy. The infants were analyzed in two groups on the basis of their MABP at the time of study: group 1 had a MABP below 30 mm Hg and group 2 more than 30 mm Hg. CBF in the two groups was compared.

Results. There was no significant difference in the mean CBF between the two groups. In group 1 the median MABP was 27.2 mm Hg (range, 23.7–29.9 mm Hg) and CBF was 13.9 (standard deviation, ±6.9) mL · 100 g−1 · min−1. In group 2 the median MABP was 35.3 mm Hg (range, 30.1–39.3 mm Hg) and CBF was 12.3 (standard deviation, ±6.4) mL · 100 g−1 · min−1. Mortality and incidence of cranial ultrasound scan abnormalities were also not significantly different.

Conclusion. These results indicate that preterm infants undergoing intensive care are able to maintain adequate cerebral perfusion at a MABP in the range of 23.7 to 39.3 mm Hg.

  • near infrared spectroscopy
  • cerebral blood flow
  • cerebral autoregulation
  • blood pressure
  • preterm infant
  • Received October 28, 1997.
  • Accepted March 13, 1998.
  • Copyright © 1998 American Academy of Pediatrics

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Pediatrics
Vol. 102, Issue 2
1 Aug 1998
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Cerebral Blood Flow Is Independent of Mean Arterial Blood Pressure in Preterm Infants Undergoing Intensive Care
Lidia Tyszczuk, Judith Meek, Clare Elwell, J. S. Wyatt
Pediatrics Aug 1998, 102 (2) 337-341; DOI: 10.1542/peds.102.2.337

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Cerebral Blood Flow Is Independent of Mean Arterial Blood Pressure in Preterm Infants Undergoing Intensive Care
Lidia Tyszczuk, Judith Meek, Clare Elwell, J. S. Wyatt
Pediatrics Aug 1998, 102 (2) 337-341; DOI: 10.1542/peds.102.2.337
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Keywords

  • near infrared spectroscopy
  • cerebral blood flow
  • cerebral autoregulation
  • blood pressure
  • preterm infant
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