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21 - Correlations of clinical, laboratory, imaging, and placental findings as to the timing of asphyxial events

from Section 3 - Diagnosis of the infant with brain injury

Published online by Cambridge University Press:  12 January 2010

David K. Stevenson
Affiliation:
Stanford University School of Medicine, California
William E. Benitz
Affiliation:
Stanford University School of Medicine, California
Philip Sunshine
Affiliation:
Stanford University School of Medicine, California
Susan R. Hintz
Affiliation:
Stanford University School of Medicine, California
Maurice L. Druzin
Affiliation:
Stanford University School of Medicine, California
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Summary

Introduction

Following the birth of a depressed newborn, the infant's caretakers are involved in providing appropriate resuscitative techniques, stabilizing the infant's biochemical and physiological abnormalities, and evaluating the infant's response to these measures. The caretakers must also ascertain the cause of the infant's depression, attempt to determine when the event or events leading to the depression occurred, and develop a plan for follow-up evaluation and treatment that will be required. The determination of causation and timing not only has medical–legal implications, but also is becoming extremely important in order to evaluate the types of therapy that may be utilized to mitigate the effects of an asphyxial event. If the infant had suffered significant damage days or weeks prior to birth, then these rescue forms of therapy will have little, if any, beneficial effect on the infant's eventual outcome. In many situations, this determination is very difficult to make, as there may be a myriad of events that could have occurred prior to the time of birth, and overlapping of significant problems makes this exercise an almost impossible task at times.

Identification of the etiology of a cerebral injury is a critical prerequisite to the determination of its timing. For example, lactic acidemia immediately after birth and an elevated serum creatine kinase (CK) level at 24 hours of age in an infant with abnormal intensities of T1- and T2-weighted signals in the basal ganglia on MRI obtained at 2 weeks of age might point to intrapartum timing of an acute hypoxic–ischemic insult.

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Publisher: Cambridge University Press
Print publication year: 2009

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