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Swelling of One Leg
Published in K. Gupta, P. Carmichael, A. Zumla, 100 Short Cases for the MRCP, 2020
K. Gupta, P. Carmichael, A. Zumla
Diagnosis of deep vein thrombosis is difficult on clinical grounds alone. The following tests will help make a diagnosis: Venography.Impedance plethysmography.Radio-iodine-labelled fibrinogen leg scanning.Ultrasound/arthrogram.Lymphangiogram.
Miscellaneous Causes Of Unexplained Fever
Published in Benedict Isaac, Serge Kernbaum, Michael Burke, Unexplained Fever, 2019
The impedance plethysmography technique, which is also noninvasive, is promising when used correctly; the changes in blood volume accompanying deep breathing are diminished in case of thrombosis.54 Combined with leg scanning it seems to be an excellent diagnostic tool.55 The radioactive fibrinogen test is a very sensitive screening method which depends on the preferential uptake of 125I-labeled human fibrinogen by a forming thrombus. It has, however, some limitations.53,54
Technical Considerations of an Electroconvulsive Therapy Apparatus
Published in Barry M. Maletzky, C. Conrad Carter, James L. Fling, Multiple-Monitored Electroconvulsive Therapy, 2019
Measuring the patient’s impedance is a difficult task, especially prior to the delivery of the stimulus. Tissue impedance decreases as tissue conducts current and, as discussed earlier, impedance of tissue is different at differing frequencies. Preictal impedance can be approximated by using square wave bi-directional pulses of 1000 Hz. This technique has been used for some time in impedance plethysmography.16
Neighbourhood deprivation in childhood and adulthood and risk of arterial stiffness: the Cardiovascular Risk in Young Finns study
Published in Blood Pressure, 2023
Erika Kähönen, Satu Korpimäki, Markus Juonala, Mika Kähönen, Terho Lehtimäki, Nina Hutri-Kähönen, Olli T. Raitakari, Mika Kivimäki, Jussi Vahtera
Measurements of arterial PWV were performed in 2007 with a whole-body impedance cardiography device (CircMonR, JR Medical Ltd, Tallinn, Estonia). The method includes whole-body impedance cardiography, distal impedance plethysmography, and an ECG channel. Standard electrodes were placed on the body surface: for the whole-body impedance measurement a pair of current electrodes on the wrist and ankles, and a pair of voltage electrodes 5 cm proximal to the aforementioned current electrodes, and for the distal impedance plethysmography measurement the active electrode on the lateral side of the knee joint and reference electrode about 20 cm distal to it on the calf. The method registers continuous changes in body electrical impedance during a cardiac cycle. The whole-body impedance decreases when the pulse pressure wave enters the aortic arch and popliteal artery impedance decreases when the pulse pressure wave later enters the lower limb. The aortic-popliteal PWV can be calculated by the CircMonR device software from the pulse transit time and the approximate distance between the aortic arch and the popliteal artery. The measurement method and its validation procedure have been introduced in detail earlier (Aatola et al. 2010; Kööbi et al. 2003). This method has been detected to have good repeatability and reproducibility values and measurements have excellent correlation (r = 0.82) with tonometric PWV method measurements (Tahvanainen et al. 2009; Wilenius et al. 2016).
Respiratory failure and bioelectrical phase angle are independent predictors for long-term survival in acute heart failure
Published in Scandinavian Cardiovascular Journal, 2022
Pietro Scicchitano, Marco Matteo Ciccone, Massimo Iacoviello, Piero Guida, Micaela De Palo, Angela Potenza, Marco Basile, Paolo Sasanelli, Francesco Trotta, Mariella Sanasi, Pasquale Caldarola, Francesco Massari
Specifically, the system is endowed with a tetrapolar impedance plethysmography that emits a 330 µA alternating sinusoidal current at a single-frequency of 50 kHz (CardioEFG, Akern RJL Systems, Florence, Italy) [7,12]. Four low-impedance electrodes were used for the performance of the BIVA: two were placed on the right upper arm, the others on the right leg. An alternating-current of 400 mA at 50 kHz was used.