Absolute Contrainindications
Conditions causing unconsciousness
- Epilipsy
- Diabetes where the patient requires insulin
ENT conditions
- Inability to auto-inflate the middle ears.
- Previous middle ear surgery with insertion of prothesis to replace any of the ossicles
Lung Conditions
- Asthma
- Lung cysts
- Previous spontaneous pneumothorax
- Obstructive lung disease
- Lungs which empty unevenly (X-ray appearance)
- Previous thoracotomy
Relative Contrainindications
- FEV1/FEV ratio less than 75%
- Poor physical condition
- Previous myocardial infarction
- Pregnancy
