ventilation-perfusion ratio

the ratio of oxygen received in the pulmonary alveoli to the flow of blood through the corresponding alveolar capillaries.

Medical dictionary. 2011.

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  • Ventilation/perfusion ratio — In respiratory physiology, the ventilation/perfusion ratio (or V/Q ratio) is a measurement used to assess the efficiency and adequacy of the matching of two variables: [LoyolaMedEd|Medicine/pulmonar/physio/pf9.htm#q1] * V ventilation the air… …   Wikipedia

  • Ventilation/perfusion scan — A ventilation/perfusion lung scan, also called a V/Q lung scan, is a type of medical imaging used to evaluate the circulation of air and blood within a patient s lungs. The ventilation part of the test looks at the ability of air to reach all… …   Wikipedia

  • Perfusion scanning — Perfusion is defined as the passage of fluid through the lymphatic system or blood vessels to an organ or a tissue. [American Psychological Association (APA):perfusion. (n.d.). Dictionary.com Unabridged (v 1.1). Retrieved March 20, 2008, from… …   Wikipedia

  • Ventilation — The exchange of air between the lungs and the atmosphere so that oxygen can be exchanged for carbon dioxide in the alveoli (the tiny air sacs in the lungs). In pulmonary medicine, a distinction is made between pulmonary and alveolar ventilation.… …   Medical dictionary

  • ratio — An expression of the relation of one quantity to another ( e.g., of a proportion or rate). SEE ALSO: index (2), quotient. [L. r. (ration ) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute] absolute terminal innervation r. the number… …   Medical dictionary

  • Perfusion — A chemotherapy technique that may be used when melanoma occurs on an arm or leg. The flow of blood to and from the limb is stopped for a while with a tourniquet, and anticancer drugs are put directly into the blood of the limb. This allows the… …   Medical dictionary

  • Positive pressure ventilation — Intervention ICD 9 CM 93.90 93.91 Me …   Wikipedia

  • Mechanical ventilation — In architecture and climate control, mechanical or forced ventilation is the use of powered equipment, e.g. fans and blowers, to move air  see ventilation (architecture). Mechanical ventilation Intervention …   Wikipedia

  • Pressure controlled intermittent mandatory ventilation — (PC IMV) is any mode of mechanical ventilation with preset inspiratory pressure (Pressure Control) and inspiratory time (Ti). Spontaneous breaths (i.e., inspiration is patient triggered and patient cycled) can exist between mandatory breaths… …   Wikipedia

  • VA/QC — ventilation perfusion [ratio] …   Medical dictionary

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