IMPEDANCE PLETHYSMOGRAPHY Meaning and
Definition
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Impedance plethysmography is a medical diagnostic technique used to measure changes in blood volume or blood flow in various parts of the body. It is a non-invasive method that involves recording and analyzing the electrical impedance signals occurring in tissues or organs.
In impedance plethysmography, small electrical currents are passed through the tissues using surface electrodes, typically placed on the skin. The resulting voltage changes are measured and analyzed to calculate impedance values. These impedance values indicate the resistance and capacitance properties of the tissues and can provide valuable information about blood volume and flow.
Impedance plethysmography is particularly useful in monitoring blood flow in the extremities, such as the arms or legs, and in evaluating conditions such as deep vein thrombosis and arterial occlusive disease. It can also be used to measure changes in blood flow during exercise or various physiological responses to certain stimuli.
This technique is preferred over invasive methods like catheterization because it is relatively simple, non-invasive, and does not involve exposure to radiation. Additionally, it can be performed at the bedside and provides real-time information on blood flow dynamics.
Overall, impedance plethysmography is a valuable tool in the field of medical diagnostics, offering insight into blood volume and flow changes in different areas of the body without the need for invasive procedures.
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Etymology of IMPEDANCE PLETHYSMOGRAPHY
The etymology of the word "Impedance Plethysmography" is as follows:
1. Impedance: The term "impedance" originates from the Latin word "impedire", which means "to hinder" or "to obstruct". In physics, impedance refers to the hindrance or opposition to the flow of current in an electrical circuit. It is derived from the Latin word "impedientia", which means "impeding" or "obstructing".
2. Plethysmography: The term "plethysmography" is derived from the Greek word "plethysmos", which means "increase" or "enlargement", and "graphein", which means "to write" or "to record". Plethysmography is a technique used to measure changes in volume within an organ or the whole body.
