| Popis: |
The aim of this diploma thesis is to compare and evaluate the results of two most widespread blood pressure measurement methods. First method, which is used as reference in this work, is auscultatory method. Nowadays, it is most often used method and it is based on auscultatory sounds. The sounds were described by the Russian physician Nikolaj Korotkov in 1905. The auscultatory method uses a tonometer with inflatable cuff and a stethoscope. The cuff is wrapped around an upper arm or wrist and inflated to about 30 mmHg above the systolic pressure - the pressure at which the radial pulse is obliterated. With the stethoscope placed over the brachial artery distal to the cuff, the cuff is then deflated at a rate 2 to 3 mmHg per second or heart beat, during which Korotkoff sounds can be heard. The cuff pressure at the onset of Korotkoff sounds, or tapping sounds, is generally taken to be systolic pressure. Diastolic pressure is generally taken to be the cuff pressure at the onset of silence. Second method used is oscillometric method. This method is based on evaluation of oscillometric pulsations that are generated in cuff during increasing or decreasing of the cuff pressure. The big problem of this method is the no clear criterion for evaluation of systolic and diastolic pressure. BPs are usually determined by... |
