Impedance Phlebography
نویسندگان
چکیده
Impedance phlebography, a noninvasive approach to the diagnosis of venous thrombosis, depends on decreasing calf electrical impedance in normal subjects during inspiration. In order to assess the relationship between impedance changes and inspiratory volume, normal subjects were studied at various depths of inspiration. The mean inspiration volume required for a result indicating no evidence of venous thrombosis was over 1500 ml. There was significant variation between subjects and between limbs in the same subject. Routine postoperative patients were not generally able to achieve these inspiration volumes. It is concluded that insufficient tidal volume is responsible for many false positive results. Impedance phlebography is not reliable without simultaneous spirometric evidence of high inspiratory volume.
منابع مشابه
Development of a real-time, semi-capacitive impedance phlebography device
Chronic venous insufficiency of the lower limbs is a disease which is caused by an increased blood pressure inside the veins of the leg and the resulting increase of the contained blood volume. This work focuses on developing a device which uses impedance plethysmography, also known as impedance phlebography, to obtain information about the blood volume in the lower leg and provides the possibi...
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