REBEL Core Cast 147.0–Ventilators Part 5: Key Mechanical Ventilator Pressures & Definitions Made Simple

🧭 REBEL Rundown 🗝️ Key Points 💨 Peak vs. Plateau Pressures: PIP reflects total airway resistance and compliance, while Pplat isolates alveolar compliance—elevations in both suggest decreased lung compliance (e.g., ARDS, pulmonary edema, pneumothorax). 🧱 PEEP Protects Alveoli: Maintains alveolar recruitment and prevents collapse; typical range 5–8 cmH₂O, but higher levels may benefit moderate–severe ARDS. ️ Driving Pressure (ΔP = Pplat − PEEP): Lower ΔP reduces atelectrauma and improves outcomes; optimize by adjusting PEEP thoughtfully. 💥 Prevent VILI: Keep Pplat < 30 cmH₂O , use low tidal volumes (6 mL/kg IBW) , and monitor for barotrauma, volutrauma, atelectrauma, and biotrauma. 📚 Evidence-Based Practice: ARDSNet and subsequent trials confirm that lung-protective ventilation—low Vt, limited pressures, and individualized PEEP—improves survival in ARDS. Click here for Direct Download of the Podcast . 📝 Introduction This episode reviews essential ventilator pressures and how to interpret them during ICU rounds. 🚀 Under Pressure Peak Inspiratory Pressure (PIP) Definition: Total pressure required to deliver a breath. Reflects: Airway resistance + lung/chest wall compliance. Common Causes of ↑ PIP: Mucus plugging Biting the endotracheal tube Kinked tubing or bronchospasm Plateau Pressure (Pplat) Definition: Alveolar pressure measured after an inspiratory hold. Reflects: Lung compliance (stiffness of lung tissue). When Both PIP & Pplat Are Elevated: → Indicates poor compliance (e.g., ARDS, pulmonary edema, pneumothorax). Positive End-Expiratory Pressure (PEEP) Definition: Pressure remaining in airways at end-expiration to prevent alveolar collapse. Typical Range: 5–8 cmH₂O but needs to titrated to meet patient requirements   Notes: Provides physiologic “glottic” PEEP in intubated patients. Using high PEEP strategy shows mortality benefit only in moderate–severe ARDS in meta-analysis. Driving Pressure (ΔP) Definition: ΔP = Pplat − PEEP . Reflects: Pressure needed to keep alveoli open during the respiratory cycle. Goal: Lower ΔP → less atelectrauma & improved outcomes. Optimize: Increase PEEP to reduce ΔP and alveolar cycling. 📖 Interpreting High PIP/High Pplat ↑ PIP & ↑ Pplat Interpretation: ↓ Compliance Common Causes: ARDS, pulmonary edema, pleural effusion, pneumothorax ↑ PIP & Normal/Low Pplat Interpretation: ↑ Airway Resistance Common Causes: Mucus plug, bronchospasm, tube obstruction or biting 🤕 Ventilator-Associated Lung Injury (VILI) Barotrauma: Mechanism: Excessive airway pressure damages alveoli. Prevention: Keep Pplat < 30 cmH ₂ O . Volutrauma: Mechanism: Overdistension from excessive tidal volumes. Prevention: Use low tidal volume ventilation (6 mL/kg ideal body weight ). ARDSNet trial: 6 mL/kg → lower mortality compared to 12 mL/kg. Ideal Body Weight: Based on height and sex , not actual weight. Typical patient: Tidal Volume: 6–8 mL/kg IBW ARDS: Tidal Volume: 4–6 mL/kg IBW Atelectrauma: Mechanism: Repeated opening/collapse of unstable alveoli. Prevention: Optimize PEEP to keep alveoli open and reduce driving pressure . Biotrauma: Mechanism: Inflammatory cascade (↑ IL-6, TNF-α) from mechanical injury. Effect: Can trigger systemic inflammation & multiorgan dysfunction. Prevention: Minimize all other forms of VILI. Post Peer Reviewed By: Marco Propersi, DO (Twitter/X: @Marco_propersi ), and Mark Ramzy, DO (X: @MRamzyDO ) 👤 Show Notes Joel Rios Rodriguez, MD PGY 3 Internal Medicine Resident Cape Fear Valley Internal Medicine Residency Program Fayetteville NC Aspiring Pulmonary Critical Care Fellow Showing Slide 1 of 1 🔎 Your Deep-Dive Starts Here It seems we can't find what you're looking for. The post REBEL Core Cast 147.0–Ventilators Part 5: Key Mechanical Ventilator Pressures & Definitions Made Simple appeared first on REBEL EM - Emergency Medicine Blog .

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REBEL Core Cast 147.0–Ventilators Part 5: Key Mechanical Ventilator Pressures & Definitions Made Simple is an episode from REBEL Cast by Salim R. Rezaie, MD.

This episode is 14:20 long.

This episode was published on Dec 22, 2025.

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