In respiratory physiology, the ventilation/perfusion ratio (V/Q ratio) is a ratio used to assess the efficiency and adequacy of the ventilation-perfusion coupling and thus the matching of two variables: V – ventilation – the air that reaches the alveoli; Q – perfusion – the blood that reaches the alveoli via the capillaries

2025年1月2日 · A V/Q mismatch refers to an imbalance between ventilation (V) and perfusion (Q) in the lungs. It means that certain regions of the lungs are not optimally exchanging gases due to either inadequate ventilation relative to blood flow or inadequate blood flow relative to ventilation.

2024年9月24日 · Ventilation-perfusion (V/Q) mismatch occurs when either the ventilation (airflow) or perfusion (blood flow) in the lungs is impaired, preventing the lungs from optimally delivering oxygen to the blood.

2023年6月28日 · When this ratio is above or below 0.8, you may have ventilation/perfusion (V/Q) mismatch. A V/Q mismatch happens when part of your lung receives oxygen without blood flow or blood flow...

2025年1月3日 · A V/Q mismatch occurs when there is an imbalance between ventilation (V) and perfusion (Q) in different areas of the lungs. Ideally, ventilation and blood flow should be matched for optimal gas exchange. A V/Q mismatch can lead to inefficient oxygen uptake or CO2 removal.

2023年1月19日 · The “V” stands for ventilation, or airflow in and out of your lungs. The “Q” stands for quantity of perfusion, or blood flow to the small blood vessels in your lungs. You might also hear it called a ventilation-perfusion scan, a lung scan or lung scintigraphy.

2023年7月16日 · The perfusion (Q) of the lungs refers to the total volume of blood reaching the pulmonary capillaries in a given time period. The ideal V/Q ratio would be 1 for maximally efficient pulmonary function.

2023年3月24日 · What is the test? The ventilation-perfusion scan is a nuclear scan so named because it studies both airflow (ventilation) and blood flow (perfusion) in the lungs. The initials V-Q are used in mathematical equations that calculate airflow and blood flow.

V/Q mismatch is a condition that occurs when this ratio is not properly matched resulting in ventilation-perfusion mismatch or dead space ventilation. V/Q mismatch can be caused by various factors, such as lung conditions like pulmonary embolism, …

What is a V/Q scan? A V/Q scan consists of two imaging tests that look for certain lung problems. The tests are: A ventilation scan measures how air moves in and out of your lungs; A perfusion scan measures circulation (how blood flows in the lungs) The two scans may be done separately or together. A V/Q scan uses a small amount of a ...