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Class 2 Impairment of the Whole Person,1 1—30% A recognized air passage defect exists.Dyspnea does not occur at rest.Dyspnea is not produced by walking freely on the level, climbing at least one flight of ordinary stairs, or the performance of other usual activities of daily living.Dyspnea is produced by stress, prolonged exertion, hurrying, hill climbing, recreation except sedentary forms, or similar activity.Examination reveals one or more of the following: partial obstruction of oropharynx, laryngopharynx, larynx, upper trachea (to 4th ring), lower trachea, bronchi, or complete obstruction of the nose (bilateral) or nasopharynx.

Class 3 Impairment of the Whole Person, 31—50% A recognized air passage defect exists.Dyspnea does not occur at rest. Dyspnea is produced by walking more than one or two blocks on the level, climbing one flight of ordinary stairs even with periods of rest, performance of other usual activities of daily living, stress, hurrying, hill climbing, recreation, or similar activity.Examination reveals one or more of the following: partial obstruction of oropharynx,laryngopharynx, larynx, upper trachea (to 4th ring), lower trachea, or bronchi.

Class 4 Impairment of the Whole Person, 51 -75%A recognized air passage defect exists. Dyspnea occurs at rest, although patient is not necessarily bedridden.Dyspnea is aggravated by the performance of any of the usual activities of daily living beyond personal cleansing, dressing, grooming or its equivalent.Examination reveals one or more of the following: partial obstruction of oropharynx, laryngopharynx, larynx, upper trachea (to 4th ring), lower trachea, or bronchi.

MASTICATION AND DEGLUTITION Numerous conditions of nongastrointestinal origin may interfere with these functions and dietary restrictions may result. If these restrictions are permanent, impairment may be determined as follows:

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