Plethysmography

in medicine and physiology, a method of continuous graphic recording of variations in the volume of a human or animal organ as modified by the circulation of blood. Plethysmography is used to study cardiovascular function and changes in the distribution of blood caused by physical and mental work, fatigue, and emotional responses; it is also used to determine the effects of heat, cold, and tactile and other stimuli and of hypotensive and hypertensive agents. Plethysmography is used in clinical analysis to evaluate vascular tonus and elasticity, pulse volume, and central nervous system function and to investigate corticovisceral functioning by registering the reaction of blood vessels to stimuli.

Figure 1. Plethysmograph: (1) cylindrical container, (2) rubber cuff, (3) tube connecting bottle to container, (4) tube connecting container to Marey capsule, (5) bottle for water, (6) kymograph

The main part of a very simple plethysmograph (Figure 1) is a container of suitable size and shape in which the part, for example, hand, leg, or finger, is placed. In animal experiments a kidney, heart, or spleen may be studied. The container is filled with water and hermetically sealed. (In Figure 1 a rubber cuff is used.) Changes in the water level in the container reflect fluctuations in blood volume in the organ or part and are recorded in the form of a curve called a plethysmogram. The plethysmogram shows small fluctuations in blood pressure corresponding to pulse and somewhat larger ones corresponding to respiration; large variations reflect vascular reactions to various stimuli. More advanced methods of plethysmography include (1) photoplethysmography, in which light is directed through an organ, such as an ear or finger, onto a photoelectric cell, or light is reflected from the organ, (2) rheoplethysmography, and (3) dielectrography, or rheocardiography. The last two methods are based on the direct recording of fluctuations in the electrical properties of an organ, which reflect the dynamics of the organ’s blood supply.

O. M. BENIUMOV

plethysmography

[plĕth″iz-mog´rah-fe] the determination of changes in volume by means of a plethysmograph.air-cuff plethysmography a technique for measuring changes in the circumference of a limb by recording the changes in pressure in an air-filled cuff surrounding the limb.respiratory inductive plethysmography a technique that uses elastic bands around the chest and abdomen of the patient to calculate chest and abdominal expansion, respiratory rate, respiratory pattern, and tidal volume.

pleth·ys·mog·ra·phy

(pleth'iz-mog'ră-fē), Measuring and recording changes in volume of an organ or other part of the body by a plethysmograph. [G. plēthysmos, increase, + graphē, a writing]

plethysmography

A technique that detects changes in the volume of an organ, limb or the body, by measuring the flow of blood through its veins. See Arterial plethysmography, Impedance plethysmography, Ocular plethysmography. Plethysmography Whole body plethysmography measures the volume of gas in the lungs, including that which is trapped in poorly communicating air spaces, of particular use in COPD and emphysema Impedance plethysmography Venous impedance plethysmography A technique used to diagnose acute venous obstruction or vascular insufficiency of an extremity by measuring the change in limb volume with each arterial pulse and during cuff occlusion of the venous flow from the limb, the manipulation of which allows evaluation of either the arterial or venous flow

pleth·ys·mog·ra·phy

(pleth'iz-mog'ră-fē) Measuring and recording changes in volume of an organ or other part of the body by a plethysmograph. [G. plēthysmos, increase, + graphē, a writing]

plethysmography

A method of assessing the volume of blood flowing through a limb or other body part by measuring the change in volume, using strain gauges, air cuffs, impedance electrodes or other methods.

单词	plethysmography
释义	plethysmography ple·thys·mo·graph P0372800 (plĕ-thĭz′mə-grăf′, plə-)n. An instrument that measures variations in the size of an organ or body part on the basis of the amount of blood passing through or present in the part. [Greek plēthusmos, increase (from plēthūnein, to increase, from plēthūs, quantity, from plēthein, to be full; see pelə- in Indo-European roots) + -graph.] ple·thys′mo·graph′ic adj.pleth′ys·mog′ra·phy (plĕth′ĭz-mŏg′rə-fē) n. plethysmography (ˌplɛθɪzˈmɒɡrəfɪ) n (Physiology) the tracking of changes measured in bodily volume Translations Plethysmography Plethysmography in medicine and physiology, a method of continuous graphic recording of variations in the volume of a human or animal organ as modified by the circulation of blood. Plethysmography is used to study cardiovascular function and changes in the distribution of blood caused by physical and mental work, fatigue, and emotional responses; it is also used to determine the effects of heat, cold, and tactile and other stimuli and of hypotensive and hypertensive agents. Plethysmography is used in clinical analysis to evaluate vascular tonus and elasticity, pulse volume, and central nervous system function and to investigate corticovisceral functioning by registering the reaction of blood vessels to stimuli. Figure 1. Plethysmograph: (1) cylindrical container, (2) rubber cuff, (3) tube connecting bottle to container, (4) tube connecting container to Marey capsule, (5) bottle for water, (6) kymograph The main part of a very simple plethysmograph (Figure 1) is a container of suitable size and shape in which the part, for example, hand, leg, or finger, is placed. In animal experiments a kidney, heart, or spleen may be studied. The container is filled with water and hermetically sealed. (In Figure 1 a rubber cuff is used.) Changes in the water level in the container reflect fluctuations in blood volume in the organ or part and are recorded in the form of a curve called a plethysmogram. The plethysmogram shows small fluctuations in blood pressure corresponding to pulse and somewhat larger ones corresponding to respiration; large variations reflect vascular reactions to various stimuli. More advanced methods of plethysmography include (1) photoplethysmography, in which light is directed through an organ, such as an ear or finger, onto a photoelectric cell, or light is reflected from the organ, (2) rheoplethysmography, and (3) dielectrography, or rheocardiography. The last two methods are based on the direct recording of fluctuations in the electrical properties of an organ, which reflect the dynamics of the organ’s blood supply. O. M. BENIUMOV plethysmography plethysmography [plĕth″iz-mog´rah-fe] the determination of changes in volume by means of a plethysmograph.air-cuff plethysmography a technique for measuring changes in the circumference of a limb by recording the changes in pressure in an air-filled cuff surrounding the limb.respiratory inductive plethysmography a technique that uses elastic bands around the chest and abdomen of the patient to calculate chest and abdominal expansion, respiratory rate, respiratory pattern, and tidal volume. pleth·ys·mog·ra·phy (pleth'iz-mog'ră-fē), Measuring and recording changes in volume of an organ or other part of the body by a plethysmograph. [G. plēthysmos, increase, + graphē, a writing] plethysmography A technique that detects changes in the volume of an organ, limb or the body, by measuring the flow of blood through its veins. See Arterial plethysmography, Impedance plethysmography, Ocular plethysmography. Plethysmography Whole body plethysmography measures the volume of gas in the lungs, including that which is trapped in poorly communicating air spaces, of particular use in COPD and emphysema Impedance plethysmography Venous impedance plethysmography A technique used to diagnose acute venous obstruction or vascular insufficiency of an extremity by measuring the change in limb volume with each arterial pulse and during cuff occlusion of the venous flow from the limb, the manipulation of which allows evaluation of either the arterial or venous flow pleth·ys·mog·ra·phy (pleth'iz-mog'ră-fē) Measuring and recording changes in volume of an organ or other part of the body by a plethysmograph. [G. plēthysmos, increase, + graphē, a writing] plethysmography A method of assessing the volume of blood flowing through a limb or other body part by measuring the change in volume, using strain gauges, air cuffs, impedance electrodes or other methods. ThesaurusSeeplethysmograph
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plethysmography

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