Notice the volume over time scalar and explain the drop in the exhaled volume below the zero line indicated by the yellow arrow:.
This is due to
0%Air leak
0%AutoPEEP
0%Double triggering
0%Faulty sensor
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Respiratory Failure & Mechanical Ventilation
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Volume over time graph goes below the zero line due to excess volume with double triggering and the recalibration of the volume to zero after the first ventilator breath in the stacked breaths.