インプラント施術時における術中管理システムの研究

―第2報　Video Overlay Monitoring Systemの生体情報処理―

抄録

Continuous monitoring is important during implant placement. Therefore, the Video Overlay Monitoring System (hereafter referred to as VOLMS), which superimposes data obtained from a commercially available monitor onto the intraoperative images from a video camera, was developed. This system allows the storage and transfer of these images. However, the system, can only display the time and vital signs on the intraoperative images.
Software for processing vital information, including recording, comparison, and evaluation of data obtained from the monitor as well as time and other factors, was developed as described below.
1. In addition to systolic blood pressure (SBP), pulse rate (PR), percutaneously measured saturation of arterial oxygen (SpO₂), and rate pressure product (RPP), a percentage change from the preoperative value is shown for each variable as an advisory mark.
2. An alarm can be programmed to be triggered at any predetermined levels of SBP, PR, SpO ₂, and RPP. Along with alarm sounds, an alarm state is notified on the screen.
3. If an alarm is sounded for any of four variables, the screen automatically switches to list the current and preoperative value for each variable, the upper and lower limits of the predetermined alarm, and a percentage change in RPP as well as the time that the alarm is sounded.
4. RPP graphics are displayed.
5. When an interval between blood pressure measurements is set to two minutes or longer, the PR and SpO₂ values obtained from the fingertip probe are displayed once per minute for data interpolation.
6. The time elapsed and the patient's age, sex, and disease history are constantly displayed on the screen.
When used as a support system for implant placement, the VOLMS with the vital information processing functions described above is expected to be very useful in preventing accidents. Especially when the operator is responsible for monitoring the patient's systemic status, this system helps the operator to make good use of vital information from the monitor with a simple procedure.