18/11/2025
🩺Understanding Mechanical Ventilation in Critical Care
Mechanical ventilators are essential devices in intensive care units, providing life-sustaining respiratory support when patients cannot breathe adequately on their own.
* How it works:
Inspiration: The ventilator delivers oxygen/air at a set pressure, volume, or time.
Expiration: Air exits passively, often with a small positive pressure (PEEP) to keep alveoli open.
Key Ventilation Modes:
Assist-Control (AC): Delivers full breaths, even if patient-triggered.
SIMV (Synchronized Intermittent Mandatory Ventilation): Combines mandatory breaths with spontaneous breathing.
◆ CPAP/BIPAP: Non-invasive positive pressure support.
PCV (Pressure Control Ventilation): Breath delivered with fixed pressure; volume depends on lung compliance.
PSV (Pressure Support Ventilation): Patient initiates breaths, ventilator adds inspiratory pressure support.
*Clinical Value:
Ensures adequate oxygenation (FiO₂ control).
Adjustable rate and tidal volume.
Built-in safety alarms for pressure, disconnections, or
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Ventilator Modes Simplified - ICU Quick Guide
For ICU Warriors - Nurses, RTs, and Doctors
Confused about modes? Here's an easy visual summary of all the major modes with quick points
VCV (Volume Control Ventilation)
Set Volume Variable Pressure
Good for: Precise minute ventilation
Watch out: High peak pressures barotrauma
2 PCV (Pressure Control Ventilation)
Set Pressure Variable Volume
Good for: ARDS, lung protection
Tidal volume not guaranteed
3 SIMV (Synchronized Intermittent Mandatory Ventilation)
Mandatory + Spontaneous breaths together
Good for: Weaning
If set wrong Increased work of breathing
4 PSV (Pressure Support Ventilation)
5 Patient triggers Ventilator supports
High pressure (long) + Quick release
Good for: Severe ARDS (recruitment)
Complex settings Need expertise
6 CPAP (Continuous Positive Airway Pressure)
Constant pressure during spontaneous breathing
Good for: OSA, SBT, mild hypoxemia
! Not for apnea patients
7 BiPAP (Bi-level Positive Airway Pressure)
IPAP for inhale + EPAP for exhale
Good for: COPD, NIV support
Not invasive ventilation
8 PRVC (Pressure Regulated Volume Control)
Target Volume + Auto Pressure Adjust
Good for: ARDS, compliance changes
Pressure may creep up silently
Quick ICU Tips:
