Figure 3

Mechanical ventilator mode 24 h before and after tracheotomy. The modes of mechanical ventilation were graded as follows: 1 = spontaneous ventilatory support mode; 2 = partly controlled ventilation and patient-triggered ventilation; and 3 = controlled ventilation without patient triggering. Data were registered 24 h before (black columns) and 24 h after (grey columns) tracheotomy.