- Untreated pneumothorax/pneumomediastinum
- Medications- Doxorubicin, Cisplatinum, Disulfiram, Mafenide Acetate
- High Fever
- History of Seizures
- Pacemaker
- History of recent ear surgery
- History of recent thoracic surgery
- Asthma
- Chronic sinusitis
- Pregnancy
- Optic Neuritis
- Emphysema
- Upper respiratory infections
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