Multimodality evoked potentials as a prognostic tool in term asphyxiated newborns

Area of Science:

• Neonatal neurology
• Neurophysiology
• Developmental pediatrics

Background:

• Hypoxic-ischemic (HI) events pose a significant risk of permanent brain damage in neonates.
• Predicting long-term neurological outcomes for infants surviving HI events remains challenging.
• Multimodality evoked potentials (MEPs) offer a method to assess cerebral function in neonates.

Purpose of the Study:

• To evaluate the prognostic accuracy of MEPs, including flash visual evoked potentials (fVEPs), somatosensory evoked potentials (SEPs), and brain-stem auditory evoked potentials (BAEPs), for predicting neurological outcomes in term neonates following HI events.
• To compare the predictive value of MEPs with the Sarnat scoring system.

Main Methods:

• MEPs (fVEPs, SEPs, BAEPs) were recorded in 40 term or near-term neonates within the first week of life.
• A 3-point grading system was used to classify MEP abnormalities as mild, moderate, or severe.
• Neurological development was assessed at 24 months corrected age using a blind protocol.

Main Results:

• Grade 0 fVEPs and SEPs were 100% associated with normal neurological status (P < 0.001).
• Abnormal SEPs or a total grade (fVEPs + SEPs) greater than I were not associated with normal outcomes (P < 0.0001).
• While normal BAEPs did not predict normal outcomes, severely abnormal BAEPs predicted abnormal outcomes. A strong correlation (r = 0.9, P < 0.0001) was found between the combined fVEPs/SEPs grade and clinical outcome, outperforming the Sarnat stage (r = 0.6, P < 0.001).

Conclusions:

• fVEPs and SEPs are highly accurate prognostic indicators for term neonates affected by HI events.
• Combined MEPs (fVEPs + SEPs) provide a more accurate prediction of ultimate neurological outcome compared to the Sarnat scoring system.
• MEPs offer a valuable tool for early assessment and prediction of neurological development in at-risk neonates.