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Marinacci communication: an electrophysiological study.

S Meenakshi-Sundaram1, Bharathi Sundar, M J Arunkumar

  • 1Department of Neurosciences, Apollo Speciality Hospitals, Lake View Road, KK Naga, Madurai, Tamil Nadu 625 020, India. drsundarsms@yahoo.com

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|December 4, 2003
PubMed
Summary
This summary is machine-generated.

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Marinacci communication, an under-recognized nerve pathway, was found in 4% of patients studied. Key electrophysiological signs include pseudo-conduction block and altered muscle action potential amplitudes.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Martin-Gruber anastomosis (median-to-ulnar forearm communication) is well-documented.
  • Marinacci communication (ulnar-to-median forearm communication) is less recognized.
  • Understanding anomalous nerve communications is crucial for accurate electrodiagnostic interpretation.

Purpose of the Study:

  • To systematically evaluate the prevalence and electrophysiological characteristics of Marinacci communication.
  • To identify diagnostic clues for recognizing Marinacci communication during electrophysiological studies.

Main Methods:

  • Electrophysiological studies were performed on 100 consecutive patients (200 arms).
  • Standard techniques included motor, sensory, and F-wave studies.
  • Specific attention was given to identifying patterns indicative of Marinacci communication.

Related Experiment Videos

Main Results:

  • Marinacci communication was identified in 4% of patients (7 out of 200 arms).
  • Electrophysiological findings included pseudo-conduction block with median nerve stimulation and increased compound muscle action potential (CMAP) amplitude with proximal ulnar stimulation.
  • Ulnar nerve stimulation at the elbow, but not the wrist, elicited a CMAP in the abductor pollicis brevis (APB) muscle.

Conclusions:

  • Marinacci communication is more prevalent than previously thought.
  • Pseudo-conduction block during median nerve stimulation and altered CMAP amplitudes with ulnar nerve stimulation are key indicators.
  • Recognition of these electrophysiological findings aids in diagnosing Marinacci communication.