METHOD FOR DIAGNOSING WATER BALANCE DISORDERS IN EXTRACELLULAR FLUID OF BODY Russian patent published in 2006 - IPC A61B5/53 

FIELD: medicine.

SUBSTANCE: method involves measuring human body dimensions, electric impedance of legs Z_L, trunk Z_T and arms Z_A in sounding them with low frequency current and potential electrodes placed on distal extremity parts, determining extracellular fluid volume of human body parts with additional current electrodes being placed on the left and right sides of the neck. Sounding currents are passed through in turn between the neck and leg electrodes on the same side. Total impedance of the right trunk part and leg Z_RTL and one of the left trunk part and leg Z_LTL. Trunk impedance is determined as Z_T = 0.5(Z_RTL + Z_LTL - Z_L). Combined impedance Z_CT of arms and thoracic trunk part is measured when passing sounding current from arm to arm. Thoracic trunk part impedance is determined as Z_TT= Z_CT - Z_A. Extracellular fluid volume of abdominal trunk part is determined as difference V_A of trunk volume V_T and thoracic trunk part V_TT. When calculating trunk volume, geometric body size is taken as distance l from plane passing through upper arm surface to the middle of radiocarpal articulation when the arm is arranged along the trunk. When calculating thoracic trunk part volume, the value is equal to 0.4*l. Water balance disorders in extracellular fluid of body are is found to take place with discrepancy in extracellular fluid volume ratios of trunk to the thoracic part volume is equal to 1.77±0.05 in men and to 1.78±0.06 in women.

EFFECT: high accuracy of the method.

2 dwg, 5 tbl