Fig. 4. Comparison of the performance of the Narkomed GS and 6000 ventilator systems during a time-cycled, volume-limited change from normal to low test lung compliance. Note that both ventilator systems delivered significantly lower minute ventilation (V̇E) as the test lung compliance was decreased. The 6000 ventilator system partially compensated for change in lung compliance; the GS ventilator system did not compensate for changing compliance.