Photoplethysmogram

photoplethysmographyphotoplethysmographPPGplethysmographpulsetechnique using light
A photoplethysmogram (PPG) is an optically obtained plethysmogram that can be used to detect blood volume changes in the microvascular bed of tissue.wikipedia
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Pulse oximetry

pulse oximeteroximetryblood oxygenation
A PPG is often obtained by using a pulse oximeter which illuminates the skin and measures changes in light absorption. While pulse oximeters are a commonly used medical device, the PPG derived from them is rarely displayed and is nominally only processed to determine heart rate.
A pulse oximeter is a medical device that indirectly monitors the oxygen saturation of a patient's blood (as opposed to measuring oxygen saturation directly through a blood sample) and changes in blood volume in the skin, producing a photoplethysmogram.

Plethysmograph

plethysmographybody plethysmographyplethysmogram
A photoplethysmogram (PPG) is an optically obtained plethysmogram that can be used to detect blood volume changes in the microvascular bed of tissue.
Photoplethysmograph

Vaginal photoplethysmograph

vaginal photoplethysmographyvaginal plethysmography
the vagina (vaginal photoplethysmograph)
Vaginal photoplethysmography (VPG, VPP) is a technique using light to measure the amount of blood in the walls of the vagina.

Heart rate monitor

heart monitorheart rate monitorsheart rate sensor
Heart rate monitor
PPG (Photoplethysmography) sensors use a light-based technology to sense the rate of blood flow as controlled by the heart's pumping action.

Hemodynamics

blood flowhemodynamichaemodynamic
Hemodynamics
Photoplethysmograph

Skin

cutaneousskin cellanimal skin
A PPG is often obtained by using a pulse oximeter which illuminates the skin and measures changes in light absorption.

Cardiac cycle

heartbeatheart beatventricular systole
With each cardiac cycle the heart pumps blood to the periphery.

Light-emitting diode

LEDLEDslight emitting diodes
The change in volume caused by the pressure pulse is detected by illuminating the skin with the light from a light-emitting diode (LED) and then measuring the amount of light either transmitted or reflected to a photodiode.

Hypovolemia

hypovolemic shockhemorrhagic shockhypovolemic
Because blood flow to the skin can be modulated by multiple other physiological systems, the PPG can also be used to monitor breathing, hypovolemia, and other circulatory conditions.

Medical device

medical devicesmedical instrumentdevices
While pulse oximeters are a commonly used medical device, the PPG derived from them is rarely displayed and is nominally only processed to determine heart rate.

Hypothermia

exposurehypothermiclow body temperature
However, in cases of shock, hypothermia, etc. blood flow to the periphery can be reduced, resulting in a PPG without a discernible cardiac pulse.

Nasal septum

septumseptal cartilagecolumella
In this case, a PPG can be obtained from a pulse oximeter on the head, with the most common sites being the ear, nasal septum, and forehead.

Vagina

birth canalvaginalvaginas
the vagina (vaginal photoplethysmograph)

Clitoris

clitoralclitoral glansglans clitoridis
the clitoris (clitoral photoplethysmograph)

Esophagus

oesophagusesophageallower esophageal sphincter
the esophagus

Premature ventricular contraction

premature ventricular contractionsextrasystolespremature ventricular beats
As seen in the figure showing premature ventricular contractions (PVCs), the PPG pulse for the cardiac cycle with the PVC results in lower amplitude blood pressure and a PPG.

Blood pressure

systolic blood pressurediastolic blood pressurearterial blood pressure
As seen in the figure showing premature ventricular contractions (PVCs), the PPG pulse for the cardiac cycle with the PVC results in lower amplitude blood pressure and a PPG.

Ventricular tachycardia

polymorphic ventricular tachycardiamonomorphic ventricular tachycardiapulseless ventricular tachycardia
Ventricular tachycardia and ventricular fibrillation can also be detected.

Ventricular fibrillation

fibrillationventricular fibrillation VFa heart defect
Ventricular tachycardia and ventricular fibrillation can also be detected.

PPG

Photoplethysmograph, an optically obtained volumetric measurement of an organ

Heart rate variability

variabilityheart rate variability trainingHRV
and the pulse wave signal derived from a photoplethysmograph (PPG).

Photoplethysmogram variability

The photoplethysmogram (PPG) measurement made at a peripheral site, such as the finger, ear or forehead represents the volume of blood in the vessel at the site of measurement.

Sexual fantasy

sexual fantasiesfantasyfantasies
To measure the reliability of a person's reporting of their fantasies, researchers may compare a person's reported sexual arousal against actual measures of arousal, using techniques such as vaginal photoplethysmography, penile strain gauges, or other tools, such as genital pulse amplitude, genital blood volume, and heart rate.

Moto 360 (2nd generation)

Moto 360 (2015)
A PPG and 9-axis accelerometer enable health and activity monitoring.