Perfusion | Definition & Treatment
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Perfusion | Definition & Treatment
73K viewsJun 2, 2017
Study.comLacey Russell
The respiratory process consists of three components. Ventilation, diffusion and perfusion. Ventilation consists of two parts: - Inspiration, which is the expansion of the chest with a negative intrapulmonary pressure when air flows into the thorax; and - Expiration, when the intrapulmonary pressure is higher than the atmosphere, air will flow out of the lungs. Diffusion is the process whereby gases move from an area of high pressure to low pressure. This includes during: - Internal respiration
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V/Q Mismatch — When Breathing Doesn’t Equal Oxygenation You’ve heard it before: Ventilation (V) and Perfusion (Q) have to match. When they don’t? That’s a V/Q mismatch — and that’s where things fall apart. • Shunt = Perfusion without ventilation Lungs are full of fluid? Collapsed? Air can’t get in. Blood flows anyway. (e.g. pneumonia, pulmonary oedema) • Dead Space = Ventilation without perfusion Air’s getting in — but blood isn’t. Blocked vessels, low flow. (e.g. PE, hypovolaemia) The result? H
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