Nakamura Y, Haffty B G, Spodick D H, Paladino D, Moreau K, Flessas A P
Am J Physiol. 1980 Mar;238(3):H355-9. doi: 10.1152/ajpheart.1980.238.3.H355.
The ear densitograph displacement pulse derivative (dD/dtear) is the analog of the arterial pressure derivative (dP/dt) and behaves comparably under a variety of cardiocirculatory challenges. Technical reliability and uniform application of the transducer are advantages that make it ideal for intrasubject monitoring. With atrial fibrillation as a model of functional variability in eight subjects, peak dD/dtear (P) tracked echocardiographic stroke volume, ejection fraction, ejection rate, and velocity of circumferential fiber shortening quite closely with the exception of some values in three subjects, two of whom had mitral regurgitation and one paradoxic septal movement. In all subjects, P showed good to excellent correlations with cycle length, preejection period (PEP), LVET (left ventricular ejection time), and PEP/LVET. The method appears to be ideally suited to intrasubject monitoring for changing ventricular function.
耳部密度描记仪位移脉冲导数（dD/dtear）类似于动脉压导数（dP/dt），并且在各种心脏循环挑战下表现相似。换能器的技术可靠性和统一应用是其优势，使其非常适合进行受试者体内监测。以八名受试者的心房颤动作为功能变异性模型，除了三名受试者中的一些值外，dD/dtear峰值（P）与超声心动图每搏输出量、射血分数、射血速率和圆周纤维缩短速度密切相关，其中两名受试者有二尖瓣反流，一名有矛盾性室间隔运动。在所有受试者中，P与心动周期长度、射血前期（PEP）、左心室射血时间（LVET）以及PEP/LVET显示出良好到极好的相关性。该方法似乎非常适合对心室功能变化进行受试者体内监测。
