Horowitz index
Horowitz Index
The Horowitz Index (pronounced: ho-ROW-witz index) is a medical term used in the field of pulmonology to measure the severity of hypoxemia in patients with COPD and other respiratory disorders.
Etymology
The term is named after Dr. Michael Horowitz, a renowned pulmonologist who first introduced this index as a diagnostic tool in the late 20th century.
Definition
The Horowitz Index, also known as the PaO2/FiO2 ratio, is calculated by dividing the arterial oxygen partial pressure (PaO2) by the fraction of inspired oxygen (FiO2). It is expressed in mmHg and provides an indication of the efficiency of oxygen exchange in the lungs.
Related Terms
- Arterial blood gas (ABG): A test that measures the levels of oxygen and carbon dioxide in the blood.
- Oxygen saturation (SpO2): The level of oxygen in the blood.
- Pulmonary function test (PFT): A test that measures how well the lungs work.
- Respiratory failure: A condition in which the level of oxygen in the blood is too low or the level of carbon dioxide is too high.
Usage
The Horowitz Index is used to assess the severity of hypoxemia and to monitor the progress of treatment in patients with respiratory disorders. A normal Horowitz Index is typically above 300 mmHg. A value below 300 mmHg indicates moderate to severe hypoxemia, and a value below 200 mmHg is associated with severe respiratory failure.
External links
- Medical encyclopedia article on Horowitz index
- Wikipedia's article - Horowitz index
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