PEDIATRICS Vol. 72 No. 5 November 1983, pp. 589-601
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Positron Emission Tomography in the Newborn: Extensive Impairment of Regional Cerebral Blood Flow with Intraventricular Hemorrhage and Hemorrhagic Intracerebral Involvement

Joseph J. Volpe MD1, Peter Herscovitch MD1, Jeffrey M. Perlman MB1, and Marcus E. Raichle MD1

1 From the Departments of Pediatrics, Neurology and Neurosurgery, and Biological Chemistry, Mallinckrodt Institute of Radiology, and McDonnell Center for Studies of Higher Brain Function, Washington University School of Medicine, St Louis

Of all patients with intraventricular hemorrhage, those with hemorrhagic intracerebral involvement exhibit the highest rates of mortality and neurologic morbidity and, indeed, account for the vast majority of all neurologic impairment in infants with intraventricular hemorrhage. Insight into the basic nature of the critical cerebral involvement requires determination of regional cerebral blood flow, previously not possible. Positron emission tomography (PET) now provides the capability of measuring regional cerebral blood flow with high resolution and little risk. In this study, we utilized PET in six premature infants (920 to 1,200 g) with major intraventricular hemorrhage and hemorrhagic intracerebral involvement to measure regional cerebral blood flow during the acute period (5 to 17 days of age). Cerebral blood flow was determined after intravenous injection of H2O, labeled with the positron-emitting isotope, 15O (oxygen 15). Findings were similar and dramatic in all six infants. In the area of hemorrhagic intracerebral involvement, little or no cerebral blood flow was detected. However, in addition, surprisingly, a marked two- to fourfold reduction in cerebral blood flow was observed throughout the affected hemisphere, well posterior and lateral to the intracerebral hematoma, including cerebral white matter and, to a lesser extent, frontal, temporal, and parietal cortex. In the one infant studied a second time, ie, at 3 months of age, the extent and severity of the decreased cerebral blood flows in the affected hemisphere were similar to those observed on the study during the neonatal period. At the three autopsies, the affected left hemisphere showed extensive infarction, corroborating the PET scans. These observations, the first demonstration of the use of PET in the determination of regional cerebral blood flow in the newborn, show marked impairments in regional cerebral blood flow in the hemisphere containing an apparently restricted intra cerebralhematoma, indicating that the hemorrhagic intracerebral involvement is only a component of a much larger lesion, ischemic in basic nature, ie, an infarction. This large ischemic lesion explains the poor neurologic outcome in infants with intraventricular hemorrhage and hemorrhagic intracerebral involvement.

Key Words: intraventricular hemorrhage • hemorrhagic intracerebral involvement • positron emission tomography • regional cerebral blood flow • cerebral ischemia

Submitted on March 14, 1983
Accepted on May 20, 1983




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