【摘要】 本文研究了垂体后叶素（Ｐｉｔ）对小鼠高频心电图（ＨＦ－ＥＣＧ）Ⅱ导联ＱＲＳ波群功率谱和高频成分（切迹，扭挫）的影响。结果说明，腹腔注射Ｐｉｔ２０ｍｉｎ后，０－８０Ｈｚ频段的相对能量较注Ｐｉｔ前增加了３９．７％（Ｐ＜０．０１）；８０－２００Ｈｚ频段的相对能量降低了１４．８％（Ｐ＜０．０５）；２００－３００Ｈｚ频段的相对能量降低了６８．９％（Ｐ＜０．０１）；３００－１０００Ｈｚ频段的相对能量降低了７１．４％（Ｐ＜０．０５）。高频切迹和扭挫数无变化。这些结果提示，心肌缺血后，高频相对能量降低。功率谱的变化较之切迹和扭挫的变化更敏感，是衡量心肌电生理机能变化的一项灵敏指标。更多还原

【Abstract】 The effects of pituitrin(pit )on the power spectrum and high-frequen-cy components of QRS complex of lead Ⅱ were studied in Kunming mice. The relative power of each frequency range and the numbers of notches and slurs after pit 20 min were compared with before pit. The results(n=12)indicated that 0-80 Hz increased 39.7%(p<0. 01);80-200Hz reduced 14.8%(p<0. 05);200-300 Hz reduced 68.9%(p<0. 01);300-1000Hz redticed 71.4%(p<0. 05);the numbers of notches and slurs were not changed.These results showed the change of power spectrum is more sensitive than thechange of notches and slurs to the electric activity of cardiac muscle.更多还原