Cardiac function display method for atrial fibrillation and sinus arrhythmia based on thorax impedance data, cardiac function evaluation system, and cardiac function data evaluation program
A method for creating a cardiac function graph of patients with atrial fibrillation and sinus arrhythmia from the thoracic impedance data and a method for analyzing and evaluating pathophysiological mechanisms are provided. A two-dimensional scatter diagram obtained by plotting the (dZ / dt) min value and the corresponding preceding RR interval (RR1) obtained by the chest impedance measurement is created, and an approximate curve thereof is obtained. From the distribution form of the plot and the slope of the approximate curve, the cardiac function status of patients with atrial fibrillation and sinus arrhythmia can be visually and easily evaluated. Furthermore, by analyzing the relationship between the ratio of RR1 to the preceding RR interval (RR2) and the (dZ / dt) min value, a graph capable of analyzing the pathophysiological mechanism can be obtained, and the cardiac function evaluation can be performed in more detail. It becomes possible. The thoracic impedance measurement method can be easily and repeatedly examined with less physical burden on the patient. According to the present invention, it is possible to provide very useful information for objectively judging diagnosis of atrial fibrillation and sinus arrhythmia patients and selection of therapeutic agents.胸郭インピーダンスデータから、心房細動や洞不整脈患者の心機能グラフを作成する方法と病態生理学的メカニズムの解析評価方法を提供する。 胸郭インピーダンス測定により得られた、(dZ/dt)min値とそれに対応する先行RR間隔(RR1)をプロットした2次元散布図を作成し、その近似曲線を求める。このプロットの分布形態と近似曲線の傾きから、心房細動や洞不整脈患者の心機能状態が、視覚的かつ容易に評価可能となる。さらに、RR1と、先々行RR間隔(RR2)との比率及び(dZ/dt)min値との関係解析により、病態生理学的メカニズムを解析可能なグラフを得ることができ、より詳細に心機能評価が可能となる。胸郭インピーダンス測定法は、患者に身体的負担が少なく容易に反復して検査が行える。本発明により心房細動や洞不整脈患者の診断や治療薬の選択などを客観的に判断する非常に有益な情報を提供できる。