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Mechanical Ventilation: Types, Indications, and Clinical Management

A mechanical ventilator (breathing machine/respirator) delivers positive-pressure breaths to patients unable to maintain adequate ventilation or oxygenation. It is a cornerstone of critical care, anesthesia, and emergency medicine.

Major Ventilation Modalities

1. Invasive Mechanical Ventilation

Requires an artificial airway—endotracheal tube (oral/nasal) or tracheostomy. Used for respiratory failure, airway protection, prolonged ventilation, and major surgery.

2. Non-Invasive Ventilation (NIV)

Support via tight-fitting face mask, nasal mask, or helmet—no intubation. First-line for COPD exacerbation, cardiogenic pulmonary edema, immunocompromised patients; also for chronic respiratory failure at home.

3. Continuous Positive Airway Pressure (CPAP)

Single constant pressure throughout respiratory cycle. Mainstay for obstructive sleep apnea; also used in neonates for RDS.

4. Bi-Level Positive Airway Pressure (BiPAP)

Two pressures: higher IPAP (inspiratory) and lower EPAP (expiratory). Preferred for COPD exacerbations, obesity-hypoventilation, neuromuscular disease.

5. Portable / Home Ventilators

Lightweight, battery-capable devices for long-term home ventilation (e.g., high spinal cord injury, advanced ALS).

Clinical Indications

• Acute hypoxemic or hypercapnic respiratory failure.
• Perioperative management during general anesthesia.
• Neuromuscular weakness impairing respiratory drive.
• Severe sepsis/septic shock with respiratory compromise.
• Post-cardiac arrest (post-ROSC ventilation).

Monitoring & Safety

Requires continuous monitoring of respiratory mechanics (tidal volume, pressures, compliance), gas exchange (ABG, SpO₂, EtCO₂), and patient-ventilator synchrony. Managed by respiratory therapists and intensivists to minimize ventilator-induced lung injury (VILI) and facilitate liberation (weaning).