[Electromyography and electroneurography in peripheral nerve lesions. Part I]

Area of Science:

• Neurology
• Neurophysiology

Context:

• Peripheral nerve lesions encompass neurapraxia, axonotmesis, and neurotmesis.
• Neurological examination alone is insufficient for comprehensive assessment.
• Neuroelectrodiagnostic methods offer valuable insights into nerve damage.

Purpose:

• To define peripheral nerve lesion types and their prognostic characteristics.
• To introduce electromyography (EMG) and electroneurography (ENG) as diagnostic tools.
• To outline the indications and applications of EMG and ENG in nerve injury evaluation.

Summary:

• Classifies peripheral nerve injuries: neurapraxia (pressure damage), axonotmesis (axon interruption), and neurotmesis (complete separation).
• Highlights the limitations of neurological exams and the utility of neuroelectrodiagnostic methods (EMG/ENG).
• Details EMG/ENG applications for open nerve injuries, chronic compression neuropathies, and radicular/plexus damage assessment.

Impact:

• Provides a framework for understanding nerve lesion prognoses.
• Establishes EMG and ENG as crucial aids in diagnosing and monitoring nerve damage.
• Facilitates accurate localization and grading of nerve injuries for improved clinical management.