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Prognostic reliability of somatosensory and visual evoked potentials of asphyxiated term infants
M J Taylor1, W J Murphy, H E Whyte
1Division of Neonatology, Hospital for Sick Children, Toronto, Ontario, Canada.
Insights
Somatosensory evoked potentials (SEPs) and visual evoked potentials (VEPs) together improve prognosis prediction for infants with perinatal asphyxia. Normal SEPs strongly predict normal outcomes, while abnormal VEPs predict abnormal outcomes.
Area of Science:
- Neuroscience
- Neonatology
- Clinical Neurophysiology
Background:
- Perinatal asphyxia poses significant risks for term infants.
- Accurate prognostication is crucial for guiding clinical management.
- Existing methods for predicting outcomes in asphyxiated infants have limitations.
Purpose of the Study:
- To evaluate if somatosensory evoked potentials (SEPs) enhance the predictive accuracy of visual evoked potentials (VEPs) for prognosing outcomes in term infants experiencing perinatal asphyxia.
- To determine the combined predictive power of SEPs and VEPs in this population.
Main Methods:
- Prospective study involving 57 term infants with perinatal asphyxia.
- Recording of SEPs and VEPs within the first three days of life, first week, and at follow-up.
- Long-term follow-up of survivors for 18 to 24 months to assess neurological outcomes.
Main Results:
- SEPs demonstrated high sensitivity (96%) and negative predictive power (97%), with normal SEPs virtually guaranteeing a normal outcome.
- VEPs showed 100% specificity and positive predictive power, meaning abnormal VEPs guaranteed an abnormal outcome.
- The combination of both SEPs and VEPs yielded higher predictive power than either test alone.
Conclusions:
- The combined use of VEPs and SEPs provides a powerful tool for prognostication in term asphyxiated infants.
- Integrating both SEPs and VEPs into the assessment protocol is recommended for improved outcome prediction.
- This combined approach can aid in clinical decision-making and resource allocation for affected infants.
Abstract:
The purpose of this study was to determine whether SEPs would improve the predictive power of VEPs for the prognosis of asphyxiated infants. 57 term infants had SEPs and VEPs recorded during the first three days of life, during the first week and at follow-up visits. All survivors have been followed for 18 to 24 months. 34 had a normal outcome, 12 had severe neurological sequelae and 11 died. The SEPs had both high sensitivity (96 per cent) and negative predictive power (97 per cent); normal SEPs virtually guaranteed normal outcome. The VEPs had both a specificity and positive predictive power of 100 per cent; abnormal VEPs guaranteed abnormal outcome. Both together had a higher predictive power than either alone. The combination of VEPs and SEPs yields a powerful means of prognostication for term asphyxiated infants; the results suggest that both be included in the assessment of this population.