These breaths appear to be patient-triggered, as indicated by the purple color on the ascending limb of the inspiratory flow-time scalar (with flow trigger setting). During mid-inspiration, a notch is visible in the pressure-time scalar, suggesting inspiratory muscle contraction leading to a pressure drop. Correspondingly, an increase in inspiratory flow can be observed, indicating the patient's inspiratory effort. This pattern suggests that each breath is patient-triggered,

This patient was admitted with CKD, pulmonary edema, and sepsis. Chest examination revealed crackles in both lungs. Tube block was suspected as the waveforms showed increased airway resistance that can be identified by loss of exponential decay in the inspiratory and expiratory flow time scalars and more horizontal course of the flow-time scalar. Waveform changes associated with increased airway resistance: 1) Flow spike at the beginning of inspiration 2) Decreased peak inspi

Work shifting in mechanical ventilation refers to a type of asynchrony where significant work of breathing transferred from the ventilator to the patient.  Suspect work shifting in volume control mode when the inspiratory limb of the pressure time scalar deforms toward the baseline in a patient triggered breath.

A failed or ineffective trigger can be identified by analysing the ventilator waveforms. Here’s how to recognize it: Pressure-Time Scalar: Baseline Pressure Drop: When the patient makes an inspiratory effort, there will be a drop in the baseline pressure. This is because the patient is trying to inhale, creating negative pressure. No Triggered Breath: Despite this drop, the ventilator does not deliver a breath. This indicates the effort was insufficient to meet the trigger se

When there is an air leak you will notice a discrepancy between inspiratory and expiratory tidal volumes. The expiratory volume-time scalar fails to reach the baseline before the next breath.

When there is an auto-PEEP/ air trapping, the expiratory flow-time scalar fails to reach the baseline before the next breath (abrupt termination of expiration).  Auto PEEP occurs when there is an increased airway resistance and/ or inadequate time for exhalation.