胡愛榮 洪文欽 肖 晴 南昌大學理學院（南昌，330006，中國）
摘要  目的  探討重建心阻抗圖測定左室心收縮力指數的正常值。方法  測量180例正常成人的重建心阻抗圖，按重建心阻抗圖左室心收縮力指數公式計算LHI，分性別、年齡組進行統計學處理。結果  正常成人的LHI隨年齡的增大而變小，同一年齡組內男性與女性基本一致 (P>0.05)；180例正常成人LHI的均值爲18.8±4.2Ω/s2，其正常值>11.0Ω/s2。結論  重建心阻抗圖測得的LHI符合人體的生理變化規律，可用于臨床心功能的檢測。
關鍵詞  重建心阻抗圖 心功能 左室心收縮力指數 正常值

基金項目：江西省自然科學基金資助項目（0340060）
中圖分類號：R443.8

Study of measuring left heather index by means of reconstructed impedance cardiogram
HU Airong, HONG Wenqin, XIAO qing.Department of physics, Nanchang university(Nanchang,330006, China)
Abstract  Objective  This paper is to investigate the normal value of left heather index (LHI) measured by reconstructed impedance cardiogram (RICG).Methods  We measured the reconstructed impedance cardiograms of 180 normal adults, and LHI is calculated on the basis of the left heather index’s formula of RICG. All cases are divided to different groups by sex and age, and the different group’s LHI is statistically calculated.Results  LHI of normal adult reduce with the increase of age, LHI of man and woman is almost no difference in same age group (P>0.05), LHI’s average value for 180 adults is 18.8±4.2Ω/s2, and its normal value is more than 11.0Ω/s2.Conclusion  LHI measured by RICG can reflect the law of human’s physiological change, and also can be used to the clinical examination of the cardiac function.
Keywords  reconstructed impedance cardiogram;cardiac function;left heather index;normal value

左室心收縮力指數（Left heather index,LHI）是一項反映左心室收縮功能的敏感指標，對于臨床評價心臟功能具有重要的意義。Kubicek法的傳統心阻抗圖是一種左、右心循環共同産生的胸部體表混合阻抗信號[1-3]，用它來測量心收縮力指數，既有左心的作用，又有右心的作用，缺乏唯一性[4]。爲此，况明星等通過波形重建，得到了重建心阻抗圖(RICG)，它包括主動脉AO、左側肺部血管PL、右側肺部血管PR、左心室LV、右心室RV五個阻抗變化分量[5]。本文利用其左心循環的主動脉和左心室分量的微分圖，按重建心阻抗圖公式計算LHI，幷對180例正常成人的結果進行了統計學分析。現將結果報告如下。