Teachable Moment: SFEMG Increased Jitter with Blocking-SFEMG Increased Jitter with Blocking MOVIE

SFEMG Increased Jitter with Blocking MOVIE_0

Video Transcription

Video Summary

Dr. Goyal discusses a case of a 65-year-old female presenting with right ptosis, double vision, and fatigue. After negative blood work and unsuccessful treatment, a single fiber electromyography (EMG) is performed. The EMG shows an abnormal pair with increased jitter and blocking. Jitter refers to the variation in time between the firing of muscle fibers within a motor unit, reflecting neuromuscular junction transmission time. Increased jitter indicates abnormal transmission, while blocking occurs when the muscle fiber fails to depolarize. These findings suggest abnormal neuromuscular junction transmission, commonly seen in conditions like Myasthenia gravis.

Keywords

Dr. Goyal

65-year-old female

ptosis

double vision

fatigue