Ventilator Basics for Nursing Students: Settings, Modes, and Alarms

Understanding Ventilation and Oxygenation

• 💡 Oxygenation is the process of adding oxygen to the body, while ventilation refers to the mechanical process of inhaling and exhaling.
• ⚠️ Hypoxemia is defined as a low level of oxygen in the arterial blood, with a normal Pao2 range of 80-100 mm of mercury.
• 🧠 The primary muscles of respiration at rest are the diaphragm and intercostal muscles, with accessory muscles like the sternocleidomastoids and abdominals used during increased exertion.
• 🌬️ Negative pressure ventilation is the natural human breathing process, where diaphragm movement creates lower pressure to draw air in. Positive pressure ventilation forces air into the lungs, used in ventilators and BiPAP.

Key Ventilator Settings Explained

• ⚙️ FiO2 (Fraction of Inspired Oxygen) indicates the percentage of oxygen a patient receives, with atmospheric air at 21%. The goal is to use the minimum effective amount to prevent oxygen toxicity.
• 🫁 PEEP (Positive End-Expiratory Pressure) is the pressure remaining in the alveoli at the end of expiration, used to improve gas exchange by keeping alveoli open longer and promoting recruitment through pores of Kohn.
• 📈 PEEP can improve gas exchange, potentially allowing for lower FiO2 levels, but high PEEP carries risks like barotrauma, pneumothorax, and interstitial emphysema.
• 🔢 The respiratory rate is a crucial setting adjusted based on the patient's needs, such as increasing it to help a CO2 retainer