A patient with a myopathy may require ventilatory support if the respiratory muscles are affected with development of restrictive lung disease.



(1) presence of one or more signs or symptoms

(2) abnormal pulmonary function testing


Abnormal signs and symptoms indicating sleep disordered breathing:

(1) nightmares

(2) morning headache

(3) daytime drowsiness


Abnormal signs and symptoms of hypoxemia:

(1) generalized fatigue

(2) dyspnea at rest

(3) orthopnea

(4) paradoxical breathing pattern


Abnormal pulmonary function testing:

(1) hypercapnea

(2) vital capacity < 45-55% of predicted for age and gender

(3) maximal inspiratory pressure < 30% of predicted


To read more or access our algorithms and calculators, please log in or register.