with respiratory disease may be difficult in obese individuals, and use of a rebreathing bag is generally easier than examination after exercise. Ancillary diagnostic aids such as radiography, endoscopy and ultrasonography should be used where appropriate. | with respiratory disease may be difficult in obese individuals, and use of a rebreathing bag is generally easier than examination after exercise. Ancillary diagnostic aids such as radiography, endoscopy and ultrasonography should be used where appropriate. |