Table 1.
Myasthenia Gravis Foundation of America clinical classification.
| Class | Description |
|---|---|
| I | Weakness of ocular muscles only |
| IIa | Mild body weakness (mainly limb and/or axial weakness), may also include eye muscles |
| IIb | Mild body weakness (mainly oropharyngeal and/or respiratory muscle weakness), may also include eye muscles |
| IIIa | Moderate body weakness (mainly limb and/or axial weakness), may also include eye muscles |
| IIIb | Moderate body weakness (mainly oropharyngeal and/or respiratory muscle weakness), may also include eye muscles |
| IVa | Severe body weakness (mainly limb and/or axial weakness), may also include eye muscles |
| IVb | Severe body weakness (mainly oropharyngeal and/or respiratory muscle weakness), may also include eye muscles |
| V | Intubation (mechanical ventilation may or may not be required) |
Adapted from Jaretzki et al. [2000].