Ventilation perfusion ratio dr najeeb biography



Ventilation perfusion ratio dr najeeb biography

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    Ventilation/perfusion ratio

    Cardiorespiratory property

    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:

    The V/Q ratio can therefore be defined as the ratio of the amount of air reaching the alveoli per minute to the amount of blood reaching the alveoli per minuteā€”a ratio of volumetric flow rates.

    These two variables, V and Q, constitute the main determinants of the blood oxygen (O2) and carbon dioxide (CO2) concentration.

    The V/Q ratio can be measured with a two-part ventilation/perfusion scan (V/Q scan).[1] Using a small amount of inhaled or injected radioactive material called a tracer for visualization, a V/Q scan is a type of nuclear medical imaging that allows for localization and characterization of blood flow (perfusion scan) and measurement of airflow (ventilation scan) within the lungs.[2]