Median Motor Study ( Figure 10–1 ) Recording Site: Abductor pollicis brevis (APB) muscle (lateral thenar eminence): G1 placed over the muscle belly G2 placed over the first metacarpal-phalangeal joint…
The recognition of abnormal spontaneous activity is one of the most important parts of the needle electromyography (EMG) examination. The presence of abnormal spontaneous activity on EMG can yield several…
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 information gained during…
After assessment of insertional and spontaneous activity, the needle electromyography (EMG) examination moves on to the evaluation of motor unit action potentials (MUAPs). In a process similar to the analysis…
After the history is taken and a directed physical examination is performed, every study begins with the nerve conduction studies (NCSs). The needle electromyography (EMG) examination is performed after the…
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 G2 placed over the metatarsal–phalangeal…
For every electrodiagnostic (EDX) test performed, one needs to decide if the study is normal or abnormal. That determination often needs to be made in real time as the testing…
Although peripheral nerve anatomy is more or less similar among individuals, in a sizable minority, there are some significant anatomic variations. These are known as anomalous innervations. Several of these…
The electromyographer need not have detailed knowledge of all the electrical and chemical events that occur at a molecular level in order to perform an electrodiagnostic (EDX) study. However, every…
Nerve conduction studies are most often used to assess distal nerve segments, with routine stimulation seldom done above the elbow or knee. Few studies can be easily performed to assess…
