AAEP Description of Scope Grades

Grade I – All movements are synchronous and symmetrical and full abduction can be achieved and maintained.

Grade II A- Abduction is achieved and maintained but transient asynchrony, flutter or delayed opening may be seen.

Grade II B – There is asymmetry of the rima glottidis much of the time due to reduced mobility of the arytenoid and vocal fold but there are occasions, typically after nasal occlusion when full symmetrical abduction is achieved and maintained.

Grade III A – There is asymmetry of the rima glottidis much of the time due to reduced mobility of the arytenoid and vocal fold but there are occasions, typically after swallowing or nasal occlusion when full symmetrical abduction is achieved but not maintained.

Grade III B – Obvious arytenoid abductor deficit and arytenoid asymmetry. Full abduction is never achieved.

Grade III C – Marked but not total arytenoid abductor deficit and asymmetry with little arytenoid movement. Full abduction is never achieved.

Grade IV – Complete immobility of the arytenoid cartilage and vocal fold.