TY - JOUR
T1 - Cerebral Blood Flow Velocities in Extremely Low Birth Weight Infants with Hypotension and Infants with Normal Blood Pressure
AU - Lightburn, Marla H.
AU - Gauss, C. Heath
AU - Williams, D. Keith
AU - Kaiser, Jeffrey R.
N1 - Funding Information:
The technical assistance of N. Carol Sikes and Melanie Mason, and the support of the University of Arkansas for Medical Sciences neonatologists, NICU nurses, and respiratory therapists are gratefully acknowledged. Editorial assistance was provided by UAMS's Office of Grants and Scientific Publications.
PY - 2009/6
Y1 - 2009/6
N2 - Objective: To determine whether extremely low birth weight (ELBW) infants with hypotension have similar cerebral hemodynamics when compared with control subjects with normal blood pressure. We hypothesized that ELBW infants with low or normal blood pressure have similar cerebral blood flow (CBF) velocity. Study design: In this case control study, CBF velocity (with Doppler ultrasound scanning), Pco2, and mean arterial blood pressure (MABP) were continuously monitored twice daily before intensive care procedures. If an infant became hypotensive (MABP ≤ gestational age in weeks), additional monitoring was performed for 10 to 20 minutes, before treatment with dopamine. Thirty ELBW infants were enrolled (637 ± 140 g, 24.2 ± 1.1 weeks); 15 had hypotension, and 15 were gestational age/birth weight-matched control subjects with normal blood pressure. CBF velocity was compared by use of the Mann-Whitney U test. Results: The groups did not differ significantly in gestational age, birth weight, race, sex, Pco2, Apgar scores, or occurrence of severe intraventricular hemorrhage. There was no difference in mean CBF velocity (P = .934) in infants with hypotension (MABP: 23 [20-24.9] mm Hg) compared with infants with normal blood pressure (MABP: 32.6 [27.5-35.7] mm Hg). Conclusion: Despite having hypotension, ELBW infants (before treatment) had similar CBF velocity compared with control subjects with normal blood pressure. On the basis of these results, hypotension may not indicate decreased CBF.
AB - Objective: To determine whether extremely low birth weight (ELBW) infants with hypotension have similar cerebral hemodynamics when compared with control subjects with normal blood pressure. We hypothesized that ELBW infants with low or normal blood pressure have similar cerebral blood flow (CBF) velocity. Study design: In this case control study, CBF velocity (with Doppler ultrasound scanning), Pco2, and mean arterial blood pressure (MABP) were continuously monitored twice daily before intensive care procedures. If an infant became hypotensive (MABP ≤ gestational age in weeks), additional monitoring was performed for 10 to 20 minutes, before treatment with dopamine. Thirty ELBW infants were enrolled (637 ± 140 g, 24.2 ± 1.1 weeks); 15 had hypotension, and 15 were gestational age/birth weight-matched control subjects with normal blood pressure. CBF velocity was compared by use of the Mann-Whitney U test. Results: The groups did not differ significantly in gestational age, birth weight, race, sex, Pco2, Apgar scores, or occurrence of severe intraventricular hemorrhage. There was no difference in mean CBF velocity (P = .934) in infants with hypotension (MABP: 23 [20-24.9] mm Hg) compared with infants with normal blood pressure (MABP: 32.6 [27.5-35.7] mm Hg). Conclusion: Despite having hypotension, ELBW infants (before treatment) had similar CBF velocity compared with control subjects with normal blood pressure. On the basis of these results, hypotension may not indicate decreased CBF.
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U2 - 10.1016/j.jpeds.2009.01.006
DO - 10.1016/j.jpeds.2009.01.006
M3 - Article
C2 - 19324371
AN - SCOPUS:67349262020
SN - 0022-3476
VL - 154
SP - 824
EP - 828
JO - Journal of Pediatrics
JF - Journal of Pediatrics
IS - 6
ER -