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Deriving pediatric nerve conduction normal values in the very young (<3 years)
Joe F Jabre1, Matthew C Pitt2, Ralph Smith2
1Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.
Insights
Establishing normal values for pediatric nerve conduction studies is crucial for accurate diagnosis. The extrapolated norms (e-norms) method provides reliable reference ranges for infants and young children, aiding neurophysiologists.
Area of Science:
- Neurophysiology
- Pediatric Neurology
- Clinical Electrophysiology
Background:
- Interpreting nerve conduction studies in pediatric patients presents challenges due to a lack of established normal values.
- Accurate electrophysiological data is vital for diagnosing neurological conditions in young children.
Purpose of the Study:
- To derive normal values for nerve conduction studies in a pediatric cohort aged 0-3 years.
- To validate the extrapolated norms (e-norms) method for pediatric electrodiagnostic testing.
Main Methods:
- The e-norms method was applied to a cohort of pediatric patients undergoing nerve conduction studies.
- Reference ranges were calculated for sensory and motor nerve conduction studies in the upper and lower extremities.
Main Results:
- E-norms were successfully calculated for multiple sensory nerves including Median, Ulnar, Superficial Peroneal, Sural, and Medial Plantar.
- E-norms were also determined for motor studies of the Median, Ulnar, Peroneal, and Tibial nerves.
Conclusions:
- The e-norms method enhances the analysis and interpretation of electrophysiological studies in infants and young children.
- Utilizing a practice-specific reference range improves the diagnostic accuracy of nerve conduction studies in pediatric populations.
Objective:
This work describes our efforts to obtain nerve conduction studies normal values in a pediatric cohort between birth and 3 years of age using the extrapolated norms or e-norms method. Interpretation of these studies poses major challenges when no reliable normal values can be found in the literature.
Methods:
The e-norms method was used to derive a reference range of upper and lower extremity sensory and motor nerve conductions normal values from a pediatric cohort referred to an EMG Laboratory for nerve conduction studies.
Results:
E-norms were calculated for Median, Ulnar, Superficial Peroneal, Sural, and Medial Plantar sensory studies, and for Median, Ulnar, Peroneal, and Tibial motor studies.
Conclusions:
Pediatric electrodiagnostic testing is a very challenging undertaking. The ability to obtain and use normal values from the neurophysiologist's own referral pool adds great value to their diagnostic work-up.
Significance:
EMG and nerve conduction studies can yield invaluable information in the diagnostic work-up of young infants. Using the e-norms method improves on the analysis and interpretation of electrophysiological studies in this age group.
