G. Nutritional complications
(1) Malnutrition: weight loss of > 10% body weight (from 			 admission weight).
(2) Elevated CO2production during weaning 			 attempts: patients pCO2 exceeds 50 mmHg. Patients caloric and 			 carbohydrate count will be reviewed (patient must be free from fever, chills, 			 shivering, or hyperdynamic state). For COPD patients; pCO2 must 			 exceed baseline by 15%.