EVIDENCE LIBRARY
Stiff-Person Case Recorded EMG Changes During a Diazepam Trial
A case report linked reduction in spontaneous muscle activity after diazepam with later antibody findings. It provided an observed response rather than a validated diagnostic-accuracy estimate.
A case report linked reduction in spontaneous muscle activity after diazepam with later antibody findings. It provided an observed response rather than a validated diagnostic-accuracy estimate.
The observed evidence
A patient with longstanding stiffness, falls, and symptoms previously attributed to anxiety underwent needle electromyography. Spontaneous motor-unit activity was recorded at rest.
After intravenous diazepam, the activity diminished and disappeared. Subsequent testing found high anti-GAD65 antibody titers, and the authors diagnosed stiff-person syndrome.
Keep the tests distinct
EMG records electrical activity; antibody testing assesses a different feature. The paper’s concluding references to genetic testing should not be substituted for the actual antibody investigation reported in the case.
A response in one patient does not establish sensitivity or specificity for a diazepam–EMG diagnostic test. Other conditions and treatment effects need consideration. The report illustrates the value of documenting objective change alongside symptoms, but cannot show that every diazepam-responsive stiffness syndrome is stiff-person syndrome or quantify the response expected in another patient.
Source paper
Original analysis of the supplied journal article, identified as PMC12828835.