Study of the electrical resistance of the circulating blood in patients of planned and urgent operations in response to volume load

Annotation. Changes in the volume of circulating blood (VCB) during critical events are unpredictable, since compensation mechanisms work in parallel with factors of aggression. The aim of the study was to compare the dynamics of electrical resistance of blood in patients undergoing planned and urgent surgical interventions in response to intravenous infusion of 0.9% NaCl. Methodology: determination of the electrical properties of blood was carried out using the EC/TDS-616 saltimeter in two standard EC and TDS modes before (EC 0 and TDS 0) and after a bolus of 400 ml of 0.9% NaCl solution (EC 60 and TDS 60), the infusion of which was carried out for 60 minutes. Statistical data processing was carried out using Windows 11 Microsoft Office Excel formulas with determination of the mean value, standard deviation, calculation of Student's t-test and p-error. Reliable differences in the electrical properties of the blood of patients in cases of urgent and planned surgery at all stages of the study were established (TDS mode 0 min in the control group 1320.6±134.15 vs. 1114.27±202.32 in the experimental group with p=0 .0029 (р≤0.05), ES mode 0 min in the control group 668.13±104.8 versus 560±97.02 in the experimental group with p=0.0076 (p≤0.05), TDS mode 60 min 1300.27±137.35 in the control group versus 1073.07±169.04 in the experimental group with p=0.00044 (p≤0.05) and ES mode 60 min 639.33±64.74 in the control group versus 524.47±105.38 in the experimental group with p=0.017 (p≤0.05)), which may indicate deeper homeostasis disorders in patients in critical condition despite relatively stable indicators of central hemodynamics.