| Abstract [eng] |
Electrolyte concentration imbalance is a very serious type of illness. Sudden cardiac death is one of the main reasons of death in dialysis patients and is closely connected to fluctuation of concentration of various electrolytes. Up until now, state of the art of measuring electrolyte concentration in the blood is a blood test. There is a need for portable and noninvasive method to determine electrolyte concentration. For this purpose, electrocardiogram signals are used. There is a theory that angle between QRS and T waves gives information about heart condition. To determine this angle in space either 8 or 10 lead system is needed which is very uncomfortable and impossible to use at home. An intention of this work is to explore possibility of acquiring electrocardiogram signals using smart scales and determine frontal projection of QRS-T angle. In this work, 3 lead electrocardiogram signals acquired using smart scales were studied. Using several methods, QRS-T angle was determined before and after hemodialysis. It was observed that for individual patients there is a change in QRS-T angle, but for the whole group changes are not statistically significant because for some patients the angle decreases and for some increases. This could be caused by several reasons, few of them include very ill patients with many different diseases – it might be impossible to gather conclusions using a group which contains such different patients. Other reason could be presence of antagonistic electrolytes and hormones which affect impact of electrolytes. In the future, blood test will be needed to support or reject these hypotheses. |
