Haffty B G, Singh J B, Spodick D H
Chest. 1983 Mar;83(3):543-6. doi: 10.1378/chest.83.3.543.
The peak derivative of the ear densitograph displacement pulse was monitored on 12 patients undergoing routine coronary angiography and left ventricular angiography. Simultaneous recording of cardiac output, heart rate, systolic time intervals, and ear densitogram were obtained throughout the progression from before angiographic injections to postcoronary angiography to after left ventricular angiography. The peak derivative of the ear densitogram (PD) consistently tracked mean systolic ejection rate, and changes in PD showed good correlation with changes in ejection rate (r=.749, p less than 0.0001). The PD of the ear densitogram appears to be a reliable noninvasive tool for tracking left ventricular function during hemodynamic and other challenges.
在12例接受常规冠状动脉造影和左心室造影的患者中，监测了耳部密度仪位移脉冲的峰值导数。在从血管造影注射前到冠状动脉造影后再到左心室造影后的整个过程中，同步记录了心输出量、心率、收缩期时间间期和耳部密度图。耳部密度图的峰值导数（PD）始终跟踪平均收缩期射血率，并且PD的变化与射血率的变化显示出良好的相关性（r = 0.749，p小于0.0001）。耳部密度图的PD似乎是一种可靠的非侵入性工具，可用于在血流动力学和其他挑战期间跟踪左心室功能。
