engleski

Exploration of Tissue Pressure by use of Bioimpedance Measurement

Compartmental syndromes complicating trauma, such as tibia fractures, soft tissue injuries, or tibia osteotomy, are challenging diagnostic and therapeutic problems. This condition of increased tissue pressure, a very frequent and severe circulation disturbance in lower extremities, is a condition in which the circulation and function of the tissue is compromised within that space. This state requires an immediate diagnostic finding and surgical treatment. The standard clinical diagnostic procedures are either painful for patients, complex, time consuming, expensive or require highly skilled team (for example, injection techniques, capsule methods, collapsible segment methods, use of radionuclide indicators, etc.). Also, the changes of tissue pressure are very often hardly detectable by some conventional diagnostic techniques for lower extremities circulation disturbances. The electrical properties of tissues seem to follow the same dependence on frequency, usually divided into three kinds of dispersion: a-dispersion occurs at low frequencies and is mainly affected by the ionic atmosphere that surrounds the cells; b-dispersion is a structural relaxation in the frequency range 10 kHz - 10 MHz; and at high frequencies the g-dispersion is known as the relaxation of water molecules. The electrical impedance of living tissues is determined by the shape, alignment, and distribution of cells, and the amount and distribution of interstitial and extracellular fluids.

lower-extremity muscles; tissue pressure; bioelectric impedance; multifrequency measurement

nije evidentirano