Introduction
Oxygen therapy is the administration of oxygen at concentrations greater than ambient air with the intent of treating or preventing the symptoms and manifestations of hypoxia. This lesson will cover various oxygen delivery systems, their principles, and clinical applications.
Step 1: Understanding Hypoxia
Hypoxia is a condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level. Before administering oxygen, it’s crucial to understand the underlying cause of hypoxia.
- Types of Hypoxia: Hypoxic, anemic, circulatory, and histotoxic.
- Assessment: Pulse oximetry, arterial blood gas (ABG) analysis.
- Clinical signs: Cyanosis, tachypnea, tachycardia, altered mental status.
Step 2: Low-Flow Oxygen Delivery Systems
Low-flow systems deliver oxygen that is diluted with room air. The patient’s breathing pattern influences the FiO2 (fraction of inspired oxygen).
Nasal Cannula
Simple Face Mask
Reservoir Masks (Partial Rebreather & Non-Rebreather)
Step 3: High-Flow Oxygen Delivery Systems
High-flow systems deliver a precise FiO2, meeting the patient’s inspiratory demand.
Venturi Mask
High-Flow Nasal Cannula (HFNC)
Step 4: Monitoring and Documentation
Regular monitoring and accurate documentation are essential for effective oxygen therapy.