(n.) An instrument for determining and registering the variations in the size or volume of a limb, as the arm or leg, and hence the variations in the amount of blood in the limb.
Example Sentences:
(1) The signals were processed digitally using three different algorithms: 1) simple linear regression (LR); 2) linear regression with drift correction achieved by adding to, or subtracting from the plethysmographic signal a term proportional to time (LRC); 3) Fourier analysis (FFT).
(2) The volume changes of the respiratory system were partitioned using an inductance plethysmograph.
(3) The results of the study indicated that one or two measurements of maximum expiratory flow calculated from a maximum expiratory flow volume curve and of lung volumes recorded in a body plethysmograph are of value in identifying the child with severe chronic asthma.
(4) A system for calibrating the Respitrace impedance plethysmograph was developed with the capacity to quantitatively verify the accuracy of calibration.
(5) A prototype system, termed an acoustic plethysmograph, was built and used to measure the volume of newborn miniature pigs.
(6) A single trained subject sat in a body plethysmograph to measure ventilation and breathed at a constant rate of 15 per minute at three different tidal volumes, of approximately 0.3, 0.6, and 1.2 litres, from the mouthpiece in the plethysmograph.
(7) In it we discuss classification by the plethysmographic means alone and the eventuality of the venous areas.
(8) We studied the dynamics of the chest wall in 10 preterm infants to describe the interaction of the chest wall volume, as partitioned by the inductance plethysmograph, and the transthoracic and abdominal pressures.
(9) A portable device equipped with a transmitted infrared photoelectric plethysmograph (TIPP) and compression cuff was designed for indirect estimation of elastic properties of the arteries.
(10) Animals were intact and prone in a flow plethysmograph in thermoneutral conditions.
(11) Total lung capacity (TLC) was measured with a body plethysmograph.
(12) At least 3 weeks after the initial sensitization injection, aerosols of the appropriate antigen were administered to conscious guinea pigs in a double-chamber body plethysmograph.
(13) Dynamic spirometry with flow-volume curves and measurement of static lung volumes in a body plethysmograph were done in 11 patients with reversible airways obstruction before and up to 240 min after inhalation of 20 mug SCH 1000 and of another 40 mug 60 min later.
(14) Airway responsiveness was determined using a plethysmographic method.
(15) The patient's complaints had disappeared one month after the operation and a normalization of his venous outflow was recorded plethysmographically.
(16) However, studies in five normal subjects suggested that calf blood flow measured with a plethysmograph was less than arterial inflow calculated from Doppler velocity measurements.
(17) We conclude that the gas dilution methods and plethysmography with a pressure-compensated volume displacement plethysmograph gave estimates of TLC which agreed even in patients with airway obstruction or emphysema, except in patients with very severe lung disease.
(18) The plethysmographic measurement of the back flow apart from the phlebography of the arm is recommended for the diagnosis and control of the course of the stasis of the axillary vein.
(19) We used a body plethysmograph to measure FEV1 (1 sec forced expiratory volume) and MEF25 (forced expiratory flow at 25% of vital capacity) as sensitive indices of airway obstruction.
(20) In 10 patients with adult respiratory distress syndrome, we studied the effects on respiratory system mechanics of two levels of positive end-expiratory pressure (PEEP), best PEEP (BP) and half of this value (HBP), using a respiratory inductive plethysmograph (RIP) combined with a super syringe.
Plethysmography
Definition:
(n.) The study, by means of the plethysmograph, of the variations in size of a limb, and hence of its blood supply.
Example Sentences:
(1) The rate of ascites formation or reabsorption was recorded in anesthetized cats using the technique of intraperitoneal plethysmography.
(2) The validation of the VSC technique with venous occlusion plethysmography (VOP) showed that the increase of time of disappearance of the wheals is well correlated with the increase of capillary permeability demonstrated by VOP.
(3) Forearm blood flow was measured by plethysmography in 13 patients.
(4) We also examined the effects of the infusion of two litres of dialysate on airways resistance (Raw) using total body plethysmography and on arterial blood gasses.
(5) The drugs were infused into the brachial artery, and forearm blood flow (by strain-gauge plethysmography), systemic blood pressure and heart rate were measured concomitantly.
(6) Measurements of hand blood flow were made by calorimetry and of forearm, calf, and foot blood flows by straingauge venous occlusion plethysmography at rest (Ta = 22 degrees C) and during rewarming.
(7) Leg (LBF) and foot (FBF) blood flows were measured with plethysmography and skin blood flow (SBF) was evaluated from laser-Doppler flowmetry and temperature recordings.
(8) Photoelectric plethysmography scores were reduced in all groups but did not differ significantly between groups.
(9) A temperature test and plethysmography suggested improvement in finger circulation only during the first three years and one year of treatment, respectively.
(10) The purpose of this study was to determine the relationship between recruitment of the DI and SM muscles measured as EMG signal amplitudes, the pattern of respiratory muscle recruitment measured with inductive plethysmography, and the intensity of the sensation of dyspnea, measured with 100 mm VAS.
(11) When evaluating the results of functional tests, it is expedient to use a combination of the parameters of spirography, the curve of forced expiration flow-volume and general plethysmography and in the choice of method preference should be given to the registration of the curve of forced expiration flow-volume.
(12) To determine limb haemodynamic effects, we measured calf blood flow and venous capacitance by venous occlusion plethysmography before and after oral labetalol in 10 patients 3-7 days following coronary bypass surgery.
(13) The pressure-flow technique was used to estimate nasal cross-sectional size, and inductive plethysmography was used to assess nasal-oral breathing.
(14) Ventilation was monitored using respiratory inductive plethysmography and swallowing was recorded by submental electromyogram.
(15) The utilization of venous occlusion plethysmography in the routine diagnosis of acute venous thrombosis in the leg has disclosed a previously unreported type of biphasic venous emptying curve that has proved to be of special diagnostic significance.
(16) We conclude that the gas dilution methods and plethysmography with a pressure-compensated volume displacement plethysmograph gave estimates of TLC which agreed even in patients with airway obstruction or emphysema, except in patients with very severe lung disease.
(17) To examine whether the so-called musculovenous pump counteracts the development of interstitial edema in the lower extremities of man in the upright position, the volume changes in the calf which occurred during twenty minutes of rhythmic muscular exercise were measured in twenty-three subjects by impedance-plethysmography.
(18) The examinations were performed under clinical control and impedance plethysmography.
(19) Forearm blood flow was measured by venous occlusion strain-gauge plethysmography.
(20) Acute infusions of both angiotensins produced dose-dependent decreases in blood flow (measured by venous occlusion plethysmography).