SU592413A1 - Caisson disease diagnosis method - Google Patents

Description

(54) METHOD OF DIAGNOSIS OF CESSONY DISEASE

one

The invention relates to the field of medicine and can be used for remote observation in any extreme conditions, such as space exploration, underground and underwater work.

A known method for diagnosing a caisson disease involves the indirect determination of gas bubbles in the blood.

However, the known method does not allow to determine the onset of the disease and the different stages of the disease, since clinical symptoms occur after the appearance of large gas bubbles in the blood.

The aim of the invention is to provide the possibility of determining the various stages of the disease.

This is achieved by the fact that according to the proposed method, the determination is made by superimposing electrodes across the projection of blood vessels and recording fluctuations in the blood impedance that occur when gas bubbles pass through the blood vessels, and the stage of the caisson disease is determined by the amplitude of oscillations corresponding to the diameter of the poses.

The method is carried out as follows.

Example 1. Porous tin-bronze electrodes are superimposed on the inner and outer surfaces of the lower third of the shoulder so that the vascular bundle of the shoulder is between the electrodes. The electrodes are connected to the 4PGA-1 rheograph and the impedance changes are recorded on an EZ4 recorder. Before recording impedance changes, the measuring bridge of the rheograph is balanced and the signal is calibrated by including 1 Ohm impedance measurement in the circuit.

Example 2. Porous electrodes are placed on the inner surface of the lower third of the right and left arms in order to measure the impedance (mainly of the vessels of the pulmonary circulation). The electrodes are connected to an RGA-1 rheograph 4 and changes in impedance are recorded on an EZ4 recorder. Before registering the changes in impedance, the measuring bridge of the rheograph is balanced and the signal is calibrated by including 1 Ohm resistance in the measuring circuit. The evaluation of the results is carried out by increasing the constant component of the impedance using the formula

1 / G 1 / k,

where UG is the volume of gas bubbles;

AR is a constant gain

impedance;

Claims (1)

R is the source impedance of the object; VK is the blood volume of the object (calculated data). Variable impedance components — Pulse and respiratory components are assessed compared to baseline amplitude, frequency, and shape. In the case of gas bubbles in the blood in the initial phase of the development of a caisson disease, the amplitude and frequency of the pulse and respiratory components of the impedance increases, their shape changes, which indicates the development of protective reactions of the body. With the growth of gas formation, the amplitude of the pulse and respiratory waves gradually decreases, until it disappears completely, which indicates the development of an embolus. The proposed method provides the possibility of early diagnosis of caisson disease 6-10 hours before the onset of clinical symptoms, the method also allows automating the decompression process in order to prevent cassopic disease and reduce the overhead time. 5 10 15 20 Formula of inventions A method for diagnosing a caisson disease, which consists in indirectly detecting gas bubbles in the blood, characterized in that, in order to make it possible to determine various stages of the disease, the determination is made by applying electrodes across the projection of blood vessels and recording fluctuations in blood impedance, arising during the passage of gas bubbles through the blood vessels, and the stage of the caisson disease is determined by the amplitude of oscillations corresponding to the diameter of the bubbles. Sources of information taken into account in the examination 1. Buckles Richard G., Kpoh Canieron, Nature, 1969, 222, No. 5195, 771-772.