Pulse Oximeter Pleth (Plethysmograph) | 合法醫療器材資訊網

Apulseoximetermeasuresoxygensaturationlevel(SpO2)andisalsoaPPG....Thebloodflowisnormallyshownasawaveformusingabarorgraph.

A plethysmograph is an instrument for measuring changes in volume within an organ or whole body (usually resulting from fluctuations in the amount of blood or air it contains). A photoplethysmograph (PPG) is a plethysmograph that uses optical techniques. A pulse oximeter measures oxygen saturation level (SpO2) and is also a PPG. It can measure the change in the volume of arterial blood with each pulse beat. This change in blood volume can be detected in peripheral parts of the body such as the fingertip or ear lobe using a technique called photoplethysmography. The pulse oximeter that detects the signal is called a plethysmograph (or Pleth for short).

Because of the nature of pulse oximeter, measuring the pressure from a pleth waveform has not been possible. However, the information has shown to be useful in diagnosis and in gauging the severity of illness in newborns. Many doctors use the ...