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  2. Ventilation–perfusion mismatch - Wikipedia

    en.wikipedia.org/wiki/Ventilation–perfusion...

    Any deviation from this value is considered a V/Q mismatch. Maintenance of the V/Q ratio is crucial for preservation of effective pulmonary gas exchange and maintenance of oxygenation levels. A mismatch can contribute to hypoxemia and often signifies the presence or worsening of an underlying pulmonary condition. [3]

  3. Ventilation/perfusion ratio - Wikipedia

    en.wikipedia.org/wiki/Ventilation/perfusion_ratio

    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 ...

  4. Ventilation–perfusion coupling - Wikipedia

    en.wikipedia.org/wiki/Ventilation–perfusion...

    It is considered abnormal when the ratio is greater or smaller than 0.8 and is referred to as ventilation-perfusion mismatch(V/Q mismatch). Further information on V/Q mismatch can be found in the clinical significance section below. Diagram of the lungs showing regional variations in V/Q ratio

  5. Alveolar–arterial gradient - Wikipedia

    en.wikipedia.org/wiki/Alveolar–arterial_gradient

    An abnormally increased A–a gradient suggests a defect in diffusion, V/Q mismatch, or right-to-left shunt. [5] The A-a gradient has clinical utility in patients with hypoxemia of undetermined etiology. The A-a gradient can be broken down categorically as either elevated or normal. Causes of hypoxemia will fall into either category.

  6. Ventilation/perfusion scan - Wikipedia

    en.wikipedia.org/wiki/Ventilation/perfusion_scan

    A ventilation/perfusion lung scan, also called a V/Q lung scan, or ventilation/perfusion scintigraphy, is a type of medical imaging using scintigraphy and medical isotopes to evaluate the circulation of air and blood within a patient's lungs, [1] [2] in order to determine the ventilation/perfusion ratio.

  7. Hypoxia (medicine) - Wikipedia

    en.wikipedia.org/wiki/Hypoxia_(medicine)

    Conversely, an increased V/Q ratio tends to be a consequence of impaired perfusion, in which circumstances the blood supply is insufficient to carry the available oxygen, P a O 2 will be normal, but tissues will be insufficiently perfused to meet the oxygen demand. A V/Q mismatch can also occur when the surface area available for gas exchange ...

  8. Respiratory failure - Wikipedia

    en.wikipedia.org/wiki/Respiratory_failure

    Respiratory failure is classified as either Type 1 or Type 2, based on whether there is a high carbon dioxide level, and can be acute or chronic. In clinical trials, the definition of respiratory failure usually includes increased respiratory rate, abnormal blood gases (hypoxemia, hypercapnia, or both), and evidence of increased work of breathing.

  9. Reperfusion injury - Wikipedia

    en.wikipedia.org/wiki/Reperfusion_injury

    Similar failure processes are involved in brain failure following reversal of cardiac arrest; [3] control of these processes is the subject of ongoing research. Repeated bouts of ischemia and reperfusion injury also are thought to be a factor leading to the formation and failure to heal of chronic wounds such as pressure sores and diabetic foot ...