Oxygen Delivery and Ventilation Support

Core distinction

Oxygenation and ventilation are related but not interchangeable.

• Oxygenation: getting oxygen into blood.
• Ventilation: removing carbon dioxide and moving gas effectively.

A patient can have acceptable oxygen saturation while ventilation worsens.

Support ladder (conceptual)

1. Low-burden oxygen support for mild hypoxemia.
2. Higher concentration oxygen interfaces when demand rises.
3. Positive-pressure support (noninvasive or invasive) when work of breathing or gas exchange failure escalates.

The operational goal is to match support level to physiology and trajectory, not to a fixed device preference.

Bedside reassessment signals

• Respiratory effort: accessory muscle use, fatigue, altered speech.
• Oxygen trend: persistent decline despite escalating oxygen suggests worsening pathology.
• Ventilation trend: rising carbon dioxide pattern, reduced tidal movement, or declining mental status.
• Hemodynamics and perfusion: instability can worsen respiratory failure and vice versa.

Safety points

• Treat rising support requirements as a warning signal.
• Avoid delayed escalation when trajectory is clearly deteriorating.
• Pair respiratory support changes with cause-directed therapy.

See airway treatment principles for integration with broader management.