Radial Neuropathy
21 Radial Neuropathy In the electromyography (EMG) laboratory, the radial nerve is studied less frequently than the median and ulnar nerves and their respective well-known lesions. Nevertheless, entrapment of the…
Brachial Plexopathy
30 Brachial Plexopathy The brachial plexus is a complicated anatomic structure formed by the ventral rami of the lower cervical and upper thoracic nerve roots. Different fascicles from those roots…
Artifacts and Technical Factors
8 Artifacts and Technical Factors Understanding and recognizing artifacts and technical factors play a central role in every nerve conduction and electromyography (EMG) study (Box 8–1). The value of the…
Proximal Neuropathies of the Shoulder and Arm
31 Proximal Neuropathies of the Shoulder and Arm Electromyographers occasionally are called on to evaluate the proximal nerves in the shoulder and arm. Isolated lesions of these nerves, including the…
Myotonic Muscle Disorders and Periodic Paralysis Syndromes
36 Myotonic Muscle Disorders and Periodic Paralysis Syndromes The myotonic muscle disorders and periodic paralysis syndromes compose a group of disorders characterized by muscle stiffness, pain, and sometimes weakness, which…
Radiculopathy
29 Radiculopathy Radiculopathy is one of the most common diagnoses referred to any electromyography (EMG) laboratory. Even with the widespread use of magnetic resonance imaging, EMG continues to play an…
Electrical Safety and Iatrogenic Complications of Electrodiagnostic Studies
40 Electrical Safety and Iatrogenic Complications of Electrodiagnostic Studies Electrodiagnostic (EDX) studies are generally well tolerated and rarely associated with any significant side effects. Most nerve conduction studies (NCSs) use…
Facial and Trigeminal Neuropathy
25 Facial and Trigeminal Neuropathy Although nerve conduction and electromyography (EMG) studies are used most often to evaluate peripheral nerve and muscle disorders, they also can be used to evaluate…
Basic Electromyography: Analysis of Motor Unit Action Potentials
15 Basic Electromyography Analysis of Motor Unit Action Potentials After assessment of insertional and spontaneous activity, the needle electromyography (EMG) examination moves on to the evaluation of motor unit action…
Routine Lower Extremity Nerve Conduction Techniques
11 Routine Lower Extremity Nerve Conduction Techniques Tibial Motor Study (Figure 11–1) Recording Site: Abductor hallucis brevis (AHB) muscle: G1 placed 1 cm proximal and 1 cm inferior to the navicular prominence…
