Proximal versus distal positioning of the anode in f-wave studies

Abstract EN

Aim of the Study: To determine whether F-wave results differ with the anode positioned proximal or distal to the cathode, i.e., if clinical anodal block exists.

Patients and Methods: Thirty persons who were neurologically free on clinical examination underwent F-wave studies performed on one median nerve.

Two surface stimulating electrodes were used with the anode placed alternately proximal and distal to the cathode.

F-wave minimum, maximum, and mean latencies and frequency of eliciting the F-wave were recorded with the anode in both proximal and distal positions.

Results: All recorded F-wave parameters were unaffected by proximal versus distal anodal positioning.

Conclusion: Anodal block is not seen in F-wave studies and reversing the stimulator does not seem to be required.