ICU Primary PrepCast Epi 95 - ICU Primary Snippet 38 - Work of Breathing and Lung Efficiency
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Mar 25, 2025 Dive into the mechanics of breathing, exploring pressure, volume, and force. Discover how lung compliance and surfactant play crucial roles in conditions like pulmonary edema and fibrosis. Learn the balance between elastic resistance and airway dynamics that impacts respiratory health. The discussion highlights how respiratory muscles function and the energy costs of breathing, revealing the effects of exercise and various respiratory conditions on lung efficiency.
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Components of Work of Breathing
- Work of breathing (WOB) is pressure times volume, measured in joules.
- It consists of elastic work (65%) and non-elastic work (35%).
Non-Elastic Work and Airway Resistance
- Non-elastic work overcomes tissue and airway resistance.
- Airway resistance is mainly in medium-sized bronchi, affected by radius, flow rate, and lung volume.
Visualizing Work of Breathing
- Swapnil suggests using the VES diagram to explain work of breathing.
- He emphasizes understanding each component for the exam.