Abstract
The purpose of the present study is to depict hemodynamic variability patterns by age on a display using a PC monitoring system by graphically plotting circulation changes during oral surgery under intravenous sedation.
The subjects were 52 healthy patients who underwent oral surgery such as tooth extraction or cystectomy. They were divided into 3 groups according to age (20’s : Group 1, 40’s : Group 2, 60’s : Group 3).
The patients’ Systolic Blood Pressure (SBP) and Pulse Rate (PR) were measured during surgery using an automatic blood pressure/pulse measuring device. Regulation of perioperative SBP and PR were plotted on the coordinate display of the personal computer, with the rate of PR as the parallel axis and the rate of SBP as the vertical axis, quadratically. In this study, the coefficient of variation of perioperative SBP (CVSBP), PR (CVPR), and the gradient of the regression line from obtained trace coordinate points were used as an index of hemodynamic variability during intravenous sedation.
Intravenous sedation was performed using propofol. BIS monitor was used as an index of sedative state and the BIS value kept to around 80. For local anesthesia of the oral cavity, 2% lidocaine with 1 : 80,000 adrenalin was also used.
In the comparison of the values during surgery between the 3 groups, the values in Group 1 for CVPR were significantly higher than those of Group 3, and the values in Group 3 for CVSBP were significantly higher than those of Group 1 and 2. The gradient of the regression line between the rate of change of PR and the SBP for Group 3 is greater than that of Group 1. This indicated that the regulation of PR is greater than that of SBP in Group 1, and the rate of SBP is greater than that of PR in Group 3. In other words, the trace on the graphic was pictured differently: in the bilateral direction in younger subjects, and in the vertical direction by in older subjects.
