AI Summary
5 min readThe episode examines a ventilator case in which a patient’s apparent low lung compliance turned out to be driven by unrecognized auto-PEEP. The discussion walks through the initial presentation, the waveform clues that pointed to dynamic hyperinflation, and the simple adjustment that reversed the cycle without paralysis or additional sedation.
Case background
The patient arrived in the emergency department after an overdose and had already received naloxone. Clinicians noted tachypnea and low delivered volumes on pressure-control ventilation set at 20 cm H₂O with an applied PEEP of 6 cm H₂O. The chest radiograph did not support naloxone-induced pulmonary edema, and the team observed that flow often fell to zero during the inspiratory phase, producing an apparent plateau. Because the patient remained tachypneic and acidotic, the working assumption shifted from primary parenchymal disease to a problem of incomplete exhalation.
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What you'll learn
- 1 (00:00) **Case introduction and initial differentials** - ED patient unable to ventilate after Narcan, suspected Narcan-induced pulmonary edema ruled out by CXR
- 2 (01:18) **Waveform analysis of plateau and flow cessation** - Plateau pauses indicate airway pressure equals alveolar pressure with no ongoing flow
- 3 (02:20) **Decision to increase pressure control** - Larger tidal volume targeted by raising driving pressure rather than shortening inspiratory time
- 4 (03:12) **Breathing pattern variation and autoPEEP suspicion** - One breath shows continued inspiratory effort while others plateau early
- 5 (04:58) **Trial of higher tidal volume support** - Pressure increased to test whether larger volumes could interrupt autoPEEP cycle
- 6 (06:44) **Post-intervention waveform changes** - Consistent pressures and improved flow curves after volume increase
- 7 (07:40) **AutoPEEP as hidden driver of apparent poor compliance** - Extra intrinsic PEEP reduces effective delta pressure, shrinking tidal volumes
+ Full timestamped outline available in the app
Show Notes
My thoughts on a waveform question from April 17 on my Instagram @pulmtoilet !!!
Go check it out !
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