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Prognostic utility of SEPs in comatose children
1Division of Neurology, Hospital for Sick Children, University of Toronto, Ontario, Canada.
Insights
Somatosensory evoked potentials (SEPs) effectively predict neurologic outcomes in comatose children. Absent or abnormal SEPs indicate poor prognosis, while normal or delayed responses suggest recovery potential.
Area of Science:
- Pediatric Neurology
- Neurophysiology
- Critical Care Medicine
Background:
- Comatose children face uncertain neurologic outcomes.
- Early and accurate prognostic tools are crucial in intensive care settings.
Purpose of the Study:
- To evaluate the utility of somatosensory evoked potentials (SEPs) for predicting neurologic outcomes in comatose children.
- To correlate initial SEP findings with patient status and final prognosis.
Main Methods:
- SEPs were recorded in 73 comatose children upon ICU admission.
- SEP results were categorized: normal, increased interpeak latencies, or absent cortical responses.
- Correlation analysis was performed between SEP findings, Glasgow Coma Scale scores, and patient outcomes.
Main Results:
- Most children (37/50) with severe coma (GCS < 7) had absent SEPs.
- No non-survivors had normal SEPs; 26 had abnormal responses.
- Normal or delayed SEPs were associated with favorable outcomes, with some delayed responses normalizing.
- SEPs were generally stable, except in Reye syndrome cases, suggesting prognostic value across coma etiologies.
Conclusions:
- SEPs are valuable for early prediction of neurologic outcomes in comatose children.
- Absent SEPs strongly correlate with poor prognosis.
- Repeat SEP studies may be beneficial, particularly for Reye syndrome patients.
Abstract:
Somatosensory evoked potentials (SEPs) were recorded in 73 comatose children upon admission to the intensive care unit and were studied in respect to initial neurologic status and final outcome. SEP results were graded normal, increased interpeak latencies, and unilaterally or bilaterally absent cortical responses. Of the 50 patients with Glasgow Coma Scale scores less than 7 upon admission, only 3 had SEPs within the normal range, while 37 had unilaterally or bilaterally absent SEPs. None of the 27 who died had normal SEPs; 1 had increased interpeak latencies, 26 had more abnormal SEPs. The 14 with normal outcomes had normal (9 patients) or delayed (4 patients) SEPs; the latter group returned to normal within a few days. Repeat SEP studies were performed in 33 patients. SEPs were relatively stable during the intensive care observation, with the exception of 6 patients with Reye syndrome. Subsequent studies are recommended in all patients, but are essential in those with Reye syndrome in order to be useful prognostically. The utility of SEPs did not vary as a function of coma etiology. These data support the usefulness of SEPs in early prediction of neurologic outcome in comatose children.