Overview
Upper limb nerve lesions involve damage to nerves in the brachial plexus or peripheral nerves, often presenting with sensory disturbances, pain, and sometimes motor deficits without significant muscle atrophy initially. 12Diagnosis
Key Diagnostic Criteria:
- Atypical pain and paresthesias in the upper limb without motor deficits or atrophy.
- Normal findings on routine motor and sensory nerve conduction studies of median and ulnar nerves.
Recommended Tests:
- Electrophysiological investigations, particularly medial antebrachial cutaneous nerve (MABCN) conduction studies.
- Needle examination from C5 to T1 segments.
Grading:
- Abnormal MABCN conduction study defined by an interside amplitude ratio ≥2 (mean + 3 SD). 1Management
First-Line Treatments:
- Conservative management including physical therapy and pain control.
Adjunctive Treatments:
- Specific drug classes not detailed in provided abstracts; focus on symptomatic relief with analgesics and anti-inflammatory medications as needed. 2Special Populations
Pregnancy: Not addressed in provided abstracts.
Pediatrics: Not addressed in provided abstracts.
Elderly: Not addressed in provided abstracts.
Comorbidities: Not addressed in provided abstracts.Key Recommendations
Utilize electrophysiological investigations, particularly MABCN conduction studies, for diagnosing mild lower brachial plexus lesions when clinical suspicion is high despite normal routine nerve conduction studies. (Evidence: Moderate) 1
Electrophysiological studies are crucial in both acute and chronic brachial plexus lesions for accurate diagnosis and guiding management. (Evidence: Moderate) 2
Consider conservative management initially, including physical therapy and symptomatic treatment, for upper limb nerve lesions without significant motor deficits. (Evidence: Expert opinion) 2References
1 Seror P. Medial antebrachial cutaneous nerve conduction study, a new tool to demonstrate mild lower brachial plexus lesions. A report of 16 cases. Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology 2004. link
2 Swash M. Diagnosis of brachial root and plexus lesions. Journal of neurology 1986. link