Oxygen Masks

About

An oxygen mask is a medical device that covers the nose and mouth to deliver supplemental oxygen. It connects to an oxygen source (tank or concentrator) and provides higher-than-air oxygen concentrations to the patient’s lungs. Oxygen therapy is used whenever a patient’s blood oxygen levels (SpO₂) are too low (hypoxemia) to safely meet tissue needs. Without enough oxygen, vital organs (brain, heart, kidneys) can suffer damage. Conditions that commonly cause hypoxemia include acute or chronic lung diseases (for example, pneumonia , asthma attacks, COPD exacerbations, pulmonary fibrosis), heart failure with pulmonary congestion, severe anemia, shock, and acute respiratory distress (e.g. ARDS or COVID-19 pneumonia). In all these cases, breathing oxygen helps raise blood oxygen levels and relieve shortness of breath. Oxygen therapy is treated like any medication: it requires a prescription and careful monitoring (via pulse oximetry or arterial blood gases). The goal is to maintain adequate oxygen saturation (usually 94–98% in most adults, or 88–92% in chronic respiratory patients). Types of Oxygen Masks (and Related Devices) A variety of masks and interfaces are used depending on how much oxygen the patient needs. Key types include: Nasal Cannula: (Not a mask, but often used first.) This is a simple plastic tube with prongs in the nostrils. It provides low-flow oxygen (1–6 L/min), which raises FiO₂ by roughly 4% per liter (about 24–44% at 6 L/min). Because it is unobtrusive, it allows talking and eating. If flows exceed ~4 L/min, a humidifier is often added to prevent nose/throat dryness. Simple Face Mask: Covers the mouth and nose and has vents on the sides for exhalation. It is used for moderate oxygen needs. Typical flow is 5–10 L/min (never below 5–6, to avoid rebreathing CO₂), delivering about 28–50% FiO₂ . The mask has an elastic strap and a moldable nose clip for a better seal. Venturi (Air-Entrainment) Mask: This mask delivers a precise, fixed oxygen concentrati