Schluter P
Patient Care Information Division, Marquette Electronics, Inc., Milwaukee, WI 53223.
J Electrocardiol. 1988;21 Suppl:S20-6. doi: 10.1016/0022-0736(88)90049-0.
For the past few years, there has been an increased interest in the detection of ST-segment changes in ambulatory patients. This interest has broadened the scope of application of long-term Holter ambulatory recording to include the routine monitoring of patients for episodes of asymptomatic (silent) ischemia. ST measurements derived from tape-recorded data, however, have been viewed with some skepticism, based on the poor fidelity of earlier Holter recorders and playback systems. The author focuses on the technical issues regarding accurate recording and playback of ST-segment data and demonstrates that a cassette-based recorder and playback system using "direct recording" can accurately reproduce the ST-segment. This discussion is based on the use of the impulse response (rather than frequency response) to characterize and improve the fidelity of the recorder/playback system for ST-segment changes.
在过去几年中，对动态患者ST段变化检测的兴趣有所增加。这种兴趣拓宽了长期动态心电图监测的应用范围，包括对患者无症状（隐匿性）心肌缺血发作的常规监测。然而，基于早期动态心电图记录仪和回放系统的保真度较差，从磁带记录数据中得出的ST段测量值受到了一些质疑。作者重点讨论了关于ST段数据准确记录和回放的技术问题，并证明了使用“直接记录”的盒式磁带记录仪和回放系统能够准确再现ST段。该讨论基于使用脉冲响应（而非频率响应）来表征和提高记录仪/回放系统对ST段变化的保真度。
