Myasthenia Classification System

A classification system for grading myasthenia gravis that divides the disease into 5 main classes and several subclasses. (NCI Thesaurus)

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Myasthenia Class V

Severe muscle weakness that requires intubation, with or without mechanical ventilation.

Myasthenia Class IV

Severe weakness affecting non-ocular muscles. May also have ocular muscle weakness.

Myasthenia Class III

Moderate weakness affecting non-ocular muscles. May also have ocular muscle weakness.

Myasthenia Class II

Mild weakness affecting non-ocular muscles. May also have ocular muscle weakness.

Myasthenia Class I

Any ocular weakness. All other muscles strength is normal.

Myalgia

Pain in a muscle or group of muscles.