- patient clinical status felt to be incompatible with hbot, e.g. respiratory failure requiring mechanical ventilation - pregnancy, determined by a serum or urine test - hemodynamic instability requiring vasopressors - inability to maintain a sitting position during treatment - inability to effectively understand and communicate with the hyperbaric operator, or to give consent - inability to spontaneously equalize ears and refusal of myringotomies - contraindications to hbot (e.g. pneumothorax)

- patient clinical status felt to be incompatible with hbot, e.g. respiratory failure requiring mechanical ventilation - pregnancy, determined by a serum or urine test - hemodynamic instability requiring vasopressors - inability to maintain a sitting position during treatment - inability to effectively understand and communicate with the hyperbaric operator, or to give consent - inability to spontaneously equalize ears and refusal of myringotomies - contraindications to hbot (e.g. pneumothorax)

- patient clinical status felt to be incompatible with hbot, e.g. respiratory failure requiring mechanical ventilation - pregnancy, determined by a urine test - hemodynamic instability requiring vasopressors - inability to maintain a sitting position during treatment - inability to effectively understand and communicate with the hyperbaric operator, or to give consent - inability to spontaneously equalize ears and refusal of myringotomies - contraindications to hbot (e.g. pneumothorax)

- patient clinical status felt to be incompatible with hbot, e.g. respiratory failure requiring mechanical ventilation - pregnancy, determined by a urine test - hemodynamic instability requiring vasopressors - inability to maintain a sitting position during treatment - inability to effectively understand and communicate with the hyperbaric operator, or to give consent - inability to spontaneously equalize ears and refusal of myringotomies - contraindications to hbot (e.g. pneumothorax)