Stodieck L S, Luttges M W
ISA Trans. 1984;23(4):59-65.
Improvements in current heart monitoring techniques could reduce the number of heart attacks and resulting deaths. The potential for using time intervals measured between waveforms of the electrocardiogram (ECG), phonocardiogram (PCG), and peripheral blood flow pulse (PP) for heart monitoring was studied. The waveform locations identified in the simultaneously recorded signals included the R- and T-wave peaks of the ECG, the first (S1) and second (S2) sounds of the PCG, and the systolic peak of the PP. The signals were found to be highly consistent from one cardiac cycle to the next. Further, the time intervals measured between the different signals were stable with time. Strong relationships were found between the intervals R to T and R to S2 and the R to R interval. In contrast, R to PP and R to S1 correlated poorly with the R to R but strongly with each other. Additional differences between the measured intervals were revealed by studying changes due to exercise and different body positions. The relationships between the measured intervals were found to be independent of PCG recording location. This study demonstrates the feasibility and potential of using the electrical-contractile indices of heart function for monitoring heart patients. Design of a computer-based monitor using the techniques specified in this study is discussed along with relative strengths and weaknesses of such a system.
当前心脏监测技术的改进可以减少心脏病发作及由此导致的死亡人数。研究了利用心电图（ECG）、心音图（PCG）和外周血流脉搏（PP）波形之间测量的时间间隔进行心脏监测的潜力。在同步记录的信号中识别出的波形位置包括ECG的R波和T波峰值、PCG的第一心音（S1）和第二心音（S2）以及PP的收缩期峰值。发现这些信号在一个心动周期到下一个心动周期之间高度一致。此外，不同信号之间测量的时间间隔随时间稳定。发现R到T、R到S2的时间间隔与R到R间隔之间存在强相关性。相比之下，R到PP和R到S1与R到R的相关性较差，但彼此之间相关性很强。通过研究运动和不同体位引起的变化，揭示了测量间隔之间的其他差异。发现测量间隔之间的关系与PCG记录位置无关。这项研究证明了使用心脏功能的电收缩指数监测心脏病患者的可行性和潜力。讨论了使用本研究中规定的技术设计基于计算机的监测器以及该系统的相对优缺点。
