Results 201 to 210 of about 9,458 (255)
Some of the next articles are maybe not open access.
Equine Veterinary Journal, 1990
Summary The technique of impedance plethysmography is described and its application to observation of lung volume changes in the horse at exercise is discussed. The results from horse at rest show that there is a close relationship between rate of lung volume change (flow rate) and the associated impedance changes during both ...
D P, Attenburrow +2 more
openaire +2 more sources
Summary The technique of impedance plethysmography is described and its application to observation of lung volume changes in the horse at exercise is discussed. The results from horse at rest show that there is a close relationship between rate of lung volume change (flow rate) and the associated impedance changes during both ...
D P, Attenburrow +2 more
openaire +2 more sources
Differential impedance plethysmography for measuring thoracic impedances
Medical & Biological Engineering & Computing, 1982A critical evaluation of the measurement of the transthoracic basic impedance Zo according to Kubicek's method revealed inhomogeneous electrical field-distributions in the region of the neck and the shoulders and in the region of the mammae in female subjects. These inhornogeneties were found to introduce uncontrollable errors, like position dependency
J H, Meijer +5 more
openaire +2 more sources
Development of multielectrode impedance plethysmography
Medical & Biological Engineering & Computing, 1986The feasibility of simultaneous independent measurements of impedance variations in the right and left apex and base of the lungs using the technique of multielectrode impedance plethysmography (MIPG) was investigated. To obtain independent impedance measurements in each region, high impedance sensitivity areas must be localised by weighting the ...
N, Furuya, K, Nakayama
openaire +2 more sources
Comparison of electrical field plethysmography with electrical impedance plethysmography
Annals of Biomedical Engineering, 1982As a means for assessing cardiac function, electrical field plethysmography (EFP) has been shown to have some features quite different from electrical impedance plethysmography (EIP). Here the two techniques are compared by using the two systems simultaneously on a subject and also with independent use in different electrode configurations. The results
S K, Guha, S, Anand
openaire +2 more sources
Meaning of Impedance Plethysmography
Nature, 1967IMPEDANCE plethysmography is a method of measuring the resistive impedance of a limb segment. Nyboer1 pointed out that the resistive impedance variation ΔR during the heart cycle is proportional to the blood volume ΔV transiently stored in the segment where ρ is the blood ...
U. BECATTINI, M. DELLA CORTE
openaire +1 more source
Errors in four-electrode impedance plethysmography
Medical & Biological Engineering & Computing, 1983The errors in electrical impedance plethysmography are not well known. In the paper errors due to inadequate instrumentation, improper electrode application, and physiological changes have been analysed. Minimum electrical requirements for a general purpose four-electrode instrument are: (a) input impedance of voltage-sensing circuit+4 kΩ; (b) output ...
D K, Swanson, J G, Webster
openaire +2 more sources
Positional Factors in Venous Impedance Plethysmography
Archives of Surgery, 1973To determine whether leg position or distance between the inner electrodes affect the magnitude of impedance change during deep inspiration, 30 adult patients (60 limbs) were studied with the Minnesota Impedance Cardiograph. Phlebography was performed in 19 limbs and correlated with the impedance findings.
F E, Deuvaert +2 more
openaire +2 more sources
Impedance Plethysmography: Correlation with Contrast Venography
Radiology, 1977Impedance plethysmography is a noninvasive, indirect test for deep venous occlusion in the lower limbs. The results of ascending contrast venography impedance plethysmography have been compared in 315 limbs. Impedance plethysmography was positive in 77 of 79 limbs with acute deep vein thrombosis proximal to the calf.
K T, Benedict +2 more
openaire +2 more sources
Plastic and Reconstructive Surgery, 1991
Vigilant postoperative monitoring of the buried muscle flap is critical after free transfer because early diagnosis of vascular insufficiency is essential to allow prompt correction. We have identified a monitoring method utilizing needle electrodes and impedance plethysmography that gives a beat-to-beat representation of muscular perfusion.
M J, Concannon +3 more
openaire +2 more sources
Vigilant postoperative monitoring of the buried muscle flap is critical after free transfer because early diagnosis of vascular insufficiency is essential to allow prompt correction. We have identified a monitoring method utilizing needle electrodes and impedance plethysmography that gives a beat-to-beat representation of muscular perfusion.
M J, Concannon +3 more
openaire +2 more sources
Electrical Impedance Plethysmography
Archives of Internal Medicine, 1962Plethysmography has proven to be a valuable method for studying the dynamics of peripheral vascular beds in normal and pathologic states and for evaluating the effects of drugs upon these beds. Refinements of the method, such as graded outflow hindrance and stopflow studies, have permitted separation of the pulsatile arterial inflow and venous runoff ...
openaire +1 more source