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Driving Pressure, Stress/Strain, and VILI Prevention in ARDS

Personalized lung-protective ventilation using driving pressure (ΔP), stress, and strain concepts to prevent ventilator-induced lung injury.

Written by: Saygı Hospital Health Guide Editorial Board
Published: · Last updated:

This content is for general information; please consult your physician for diagnosis and treatment.

References (3)

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What is Driving Pressure, Stress/Strain, and VILI Prevention in ARDS?

Ventilator-Induced Lung Injury (VILI) is a major contributor to ARDS mortality. Four mechanisms: volutrauma (high tidal volume), barotrauma (high pressure), atelectrauma (repeated opening-closing), biotrauma (mediator release, systemic inflammation).

The classical ARDSNet strategy targets tidal volume (Vt 6 mL/kg IBW) and plateau pressure (<30 cmH2O). However, the Amato (2015) meta-analysis identified driving pressure (ΔP = Pplat - PEEP) <15 cmH2O as the parameter most strongly associated with mortality. Low ΔP is particularly protective in the 'baby-lung' situation (small ventilatable volume).

Stress (pressure on lung tissue) = transpulmonary pressure (Pplat − Ppl). Strain = tidal volume / functional residual capacity (FRC). Physiological targets: stress <27 cmH2O, strain <2. Esophageal manometry allows calculation of Ppl and therefore these parameters in clinical practice.

Mechanical power — the energy delivered to the lung by the ventilator (J/min); values above 17 J/min are associated with increased injury. Formula: 0.098 × RR × Vt × (PIP − ΔP/2). Particular care is needed in obese patients, ARDS, and high PEEP.

Symptoms

ARDS with high ΔP >15 cmH2O + VILI risk (progressive hypoxemia, worsening pulmonary edema)
Refractory ARDS — low compliance <30 mL/cmH2O, plateau pressure approaching 30
Obese patient (BMI >35) — high intra-abdominal pressure, elevated Ppl, transpulmonary assessment critical
Chronic lung disease + ARDS — altered baseline compliance requires ventilator-setting sensitivity
Spontaneous breathing effort (patient-ventilator asynchrony) — high transpulmonary pressure causing patient self-inflicted lung injury (P-SILI)

Risk Factors

High tidal volume (>8 mL/kg IBW) — volutrauma, stretch injury
High plateau pressure (>30 cmH2O) — barotrauma, alveolar rupture, pneumothorax
Low PEEP — atelectrauma (repeated opening-closing), biotrauma
High FiO2 (>0.6 for long periods) — oxygen toxicity, absorption atelectasis
Patient-ventilator asynchrony — spontaneous breathing effort leads to high ΔP (P-SILI)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • In all ARDS patients at initial setup: Vt 6 mL/kg IBW, ΔP <15, plateau <30, PEEP per the ARDSNet table
  • If ΔP >15 cmH2O — reduce Vt to 4-5 mL/kg (accept permissive hypercapnia), titrate PEEP
  • Obese or complex ARDS — consider esophageal manometry (transpulmonary targets)

Treatment Methods

01
Initial setup — Vt 6 mL/kg ideal body weight (IBW — height-based), PEEP 5-10 (ARDSNet FiO2-PEEP table), plateau <30, ΔP <15, FiO2 targeting SpO2 92-96%
02
Driving-pressure optimization — measure Pplat and PEEP (no-flow end-insp and end-exp pauses); calculate ΔP = Pplat − PEEP; if >15, reduce Vt (accept 4-5 mL/kg) or increase PEEP (if compliance improves, ΔP falls)
03
PEEP titration — ARDSNet table or pressure-volume curve (low FiO2 need ↔ high PEEP); choose PEEP that maximizes compliance; pulse-oximetry plus compliance-based decremental titration
04
Esophageal manometry — esophageal balloon to estimate Ppl; targets: transpulmonary PEEP (end-expiration) +3 to +8, transpulmonary plateau <25. Valuable in obese and complex ARDS
05
Permissive hypercapnia — restricting Vt to reduce ΔP may raise PaCO2 to 60-80 mmHg; pH as low as 7.20 tolerable (in patients without intracranial pressure concerns)
06
Spontaneous-breathing management — early spontaneous breathing can be harmful (P-SILI); controlled ventilation for 48-72 hours (with NMB), then a spontaneous trigger mode (PS or APRV); if asynchrony is severe, deep sedation + NMB

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