Ultrasound in EMG-Guided Biopsies: A Prospective, Randomized Pilot Trial

Area of Science:

• Neurology
• Medical Imaging

Background:

• Core muscle biopsies are crucial for diagnosing neuromuscular disorders.
• Current practice relies on electromyography (EMG) for muscle selection, without routine ultrasound (US) guidance.

Purpose of the Study:

• To evaluate if ultrasound (US) guidance enhances the diagnostic yield of muscle biopsies.
• To compare US-guided EMG-selected muscle biopsies against the traditional approach.

Main Methods:

• A randomized study involving 40 patients and two physicians.
• Biopsies were performed using either US guidance or a traditional approach.
• Key metrics included tissue volume/mass, definitive diagnosis rates, and complication incidence.

Main Results:

• In the US-guided group (16 biopsies), 50% yielded a definitive diagnosis.
• In the non-US-guided group (24 biopsies), 58% yielded a definitive diagnosis.
• Diagnostic yield and complication rates were comparable between groups.

Conclusions:

• Ultrasound (US) guidance offers no additional diagnostic advantage for muscle biopsies when muscles are pre-selected using electromyography (EMG).
• The study did not support the routine use of US guidance in this specific biopsy protocol.