Ulnar Neuropathy at the Elbow
19 Ulnar Neuropathy at the Elbow Ulnar neuropathy at the elbow (UNE) is second only to median nerve entrapment at the wrist (i.e., carpal tunnel syndrome [CTS]) as the most…
Median Neuropathy at the Wrist
17 Median Neuropathy at the Wrist Median nerve entrapment at the wrist is the most common of all entrapment neuropathies and, consequently, is one of the most frequent reasons for…
Basic Electromyography: Analysis of Spontaneous Activity
14 Basic Electromyography Analysis of Spontaneous Activity The recognition of abnormal spontaneous activity is one of the most important parts of the needle electromyography (EMG) examination. The presence of abnormal…
Lumbosacral Plexopathy
32 Lumbosacral Plexopathy The anterior rami of the L1–S3 roots come together to form the lumbosacral plexus, from which all major lower extremity nerves are derived. Disorders of the lumbosacral…
Neuromuscular Junction Disorders
34 Neuromuscular Junction Disorders Disorders affecting the neuromuscular junction (NMJ) are among the most interesting and rewarding seen in the electromyography (EMG) laboratory. These disorders are generally pure motor syndromes…
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…
