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Table 3 List of contraindication to hyperbaric exposures in OSHA standards

From: Underwater and Hyperbaric Medicine as a Branch of Occupational and Environmental Medicine

System Disorders that may restrict or limit occupational exposure
Neurology History of seizure disorder other than early febrile convulsions
  Chronic inability to equalize sinus and/or middle ear pressure
Otorhinolaryngology Meniere’s disease
  Vestibular end-organ destruction
Hematology Hemoglobinopathies
Pulmonalogy Cystic or cavitary disease of the lungs
Obstructive or restrictive lung disease
Pneumothorax
Cardiology Cardiac abnormalities (e.g., pathologic heart block, valvular disease, intraventricular conduction defects other than isolated right bundle branch block, angina pectoris, arrhythmia, coronary artery disease)
Other Malignancies (active) unless treated and without recurrence for 5 yr
Impaired organ function caused by alcohol or drug use
Conditions requiring continous medication for control
  (e.g., antihistamines, steroids, barbiturates, mood altering drugs, or insulin)