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Photoplethysmography of the thumb by off-axis digital holography. pulsatile waves on the back of a frog measured by off-axis holographic photoplethysmography Remote photoplethysmography can also be performed by digital holography , which is sensitive to the phase of light waves, and hence can reveal sub-micron out-of-plane motion.
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). The word is derived from the Greek "plethysmos" (increasing, enlarging, becoming full), and "graphein" (to write).
Pulmonary function testing (PFT) is a complete evaluation of the respiratory system including patient history, physical examinations, and tests of pulmonary function. The primary purpose of pulmonary function testing is to identify the severity of pulmonary impairment. [1]
Air displacement plethysmography (ADP, also known as whole-body air displacement plethysmography) is a recognized and scientifically validated densitometric method to measure human body composition. ADP is based on the same principles as the gold standard method of hydrostatic weighing , but through a densitometric technique that uses air ...
Rosfors, S. Venous photoplethysmography: Relationship between transducer position and regional distribution of venous insufficiency. J Vasc Surg 1990;11:436-40. Rytherfor, RB; Lowenstein, DH; Klein, MF. Combining segmental systolic pressure and plethysmography to diagnose arterial occlusive disease of the legs. Am J Surg 1979;138:211-17.
The PPGV was found to be useful in detecting blood loss by observing the spectral features of the PPGV. [3] [4] [5] LF power, together with other features derived from the PPG waveform, was used to classify patients into different ranges of systemic vascular resistance, which may be used as an indicator of critical illness. [6]
A respiratory inductance plethysmograph consists of two sinusoid wire coils insulated and placed within two 2.5 cm (about 1 inch) wide, lightweight elastic and adhesive bands. The transducer bands are placed around the rib cage under the armpits and around the abdomen at the level of the umbilicus (belly button).
Optoelectronic plethysmography can be used following different measurement protocols, specifically developed for different applications and different experimental and clinical situations. In the arrangement designed for the analysis in sitting and standing positions, 89 markers are arranged on the thoraco-abdominal surface. [ 1 ]