[Problems in adjustment to negative pressure ventilation].

We tried to establish a nasal intermittent positive pressure ventilation for a 54-year old patient with post-polio kyphoscoliosis. Due to intractable rhinitis the patient stopped the treatment. A negative pressure ventilation via a cuirass exhibited an inverse ventilation: during the inspiratory cycle of the ventilator the diaphragm was elevated and the patient was forced to exhale, afterwards he needs to inhale by himself. The ventilatory support is now done via a combined nasal-mouth mask and intermittent positive pressure ventilation.