Pulssimittaus

Pulssimittaus, also known as pulse oximetry, is a non-invasive method used to measure the oxygen saturation of hemoglobin in the blood. It is commonly used in medical settings to monitor a patient's oxygen levels, particularly in critical care, during surgery, and in emergency situations. The device used for this purpose is called a pulse oximeter.

The principle behind pulse oximetry is based on the absorption of light by hemoglobin. A pulse oximeter typically consists of a light source and a detector. The light source emits light at two different wavelengths, usually red and infrared, which are absorbed by hemoglobin in the blood. The detector measures the amount of light that passes through the tissue and is absorbed by the hemoglobin.

The ratio of the absorption of red light to infrared light is used to calculate the oxygen saturation of hemoglobin. This ratio is then converted into a percentage, representing the amount of oxygen bound to hemoglobin relative to the total hemoglobin present. A normal oxygen saturation level is typically around 95-100%.

Pulse oximetry is a safe, painless, and quick method of monitoring oxygen levels. It is widely used due to its convenience and the fact that it does not require any blood to be drawn. However, it is important to note that pulse oximetry can sometimes provide inaccurate readings, especially in certain conditions such as low perfusion, low blood flow, or the presence of certain medications. Therefore, it should be used in conjunction with other monitoring methods when necessary.