Daniel M Cushman, MD
This video demonstrates needle electromyography on a patient with respiratory synkinesis, with a needle in the right biceps brachii muscle. The first section of the video shows a relaxed patient, with the appearance of motor units associated with the inhalation phase of breathing. Next, the electromyographer asks her to take a deep breath with subsequent activation of numerous atypical motor units, which is done three times. For the last section, the patient holds her breath, and the motor unit stops firing.