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The effect of plasmapheresis on post-thymectomy ocular dysfunction

C W Olanow, A D Roses, J W Fay

The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques

|May 1, 1981

Summary

Plasmapheresis did not improve ocular symptoms in myasthenia gravis patients, despite reducing acetylcholine receptor (AChR) antibodies. Prednisone, however, led to significant clinical improvement, suggesting different treatment mechanisms.

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Area of Science:

Neurology
Immunology

Background:

Myasthenia gravis (MG) is an autoimmune disorder affecting neuromuscular junctions.
Ocular signs are common residual symptoms post-thymectomy in MG patients.

Purpose of the Study:

To evaluate the efficacy of plasmapheresis in treating post-thymectomy ocular signs in MG.
To investigate the correlation between acetylcholine receptor (AChR) antibody titers and clinical status.
To compare the effects of plasmapheresis and prednisone in this patient cohort.

Main Methods:

Five MG patients with residual ocular signs post-thymectomy were treated with plasmapheresis.
AChR antibody titers were monitored.
Clinical response was assessed.
Patients subsequently received prednisone treatment.

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Main Results:

Plasmapheresis led to a significant reduction in AChR antibody titers.
No clinical improvement in ocular signs was observed following plasmapheresis.
A dramatic clinical response was achieved with prednisone treatment.
AChR antibody titers did not correlate with individual patient clinical status.

Conclusions:

Plasmapheresis may not be effective for post-thymectomy ocular MG symptoms, potentially by removing a thymic factor.
Prednisone appears to act via a different mechanism, offering significant clinical benefit.
AChR antibody levels may not be a reliable indicator of clinical status in all MG patients.