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KMID : 0352519800170030577
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Korea Univercity Medical Journal
1980 Volume.17 No. 3 p.577 ~ p.592
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Study on the Intervals of Cardiac Cycle Events in Hypertensive and Ischemic Heart Diseases
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洪性澈/Hong, Sung-Chul
盧英茂/徐舜圭/Rho, Young-Moo/Suh, Soon-Kyu
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Abstract
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The measurement of the systolic and diastolic phases of the cardiac cycle by indirect means offers a convinient and noninvasive approach to evaluate changes in cardiac performance and remains one of the simple and reliable method of cardiac evaluation.
Since 1973 when Lee studied the intervals of hemodynamic events in the cardiac cycle in healthy Koreans by apexcardiogram, studies on the systolic time intervals in normal subjects, hypertension and thyrotoxicosis have been reported in Korea. However, studies -on the cardiac cycle events including both systolic and diastolic intervals are still scanty, and there is no study on the cardiac cycle events in patients with ischemic heart disease in Koreans. The present study was designed to investigate the changes in the intervals of -cardiac cycle events in patients with hypertensive heart disease without heart failure, stable angina pectoris and old myocardial infarction without heart failure by nonivasive technique by simultaneous recording of ECG, PCG, ACG and carotid artery pulse with Hewlett-Packard 1514C ECG/Phono system.
The result obtained were summarized as follows.
1. The intervals of the cardiac cycle events in normal subjects were presented and compared to those presented by other investigators. The SFP and ET/IVCT ratio were higher in male group. However, there was no difference of the cardiac cycle events between male and female groups in this study.
2. The values of Q-IM, IVRT, IVCT, PEP, PEP/LVET ratio and RFP were higher and ET were lower in patients with hypertensive heart disease than in normal group. The significance of these changes were discussed.
3. The only change in patients with stable angina pectoris was the prolongation of Q-I1.( and RFP comparing to that of normal group. Difference of the values of PEP, IVCT, PEP/LVET ratio and ET/IVCT ratio in angina group to those of normal group was not significant, which suggested that cardiac performance at rest in patients with
stable angina pectoris was within the ranges of normal subjects.
4. The values of Q-IM, IVCT, IVRT, PEP and PEP/LVET ratio were higher and ET/´ IVCT ratio were lower in patients with old myocardial infarction than in normal subjects.
The site of infarction did not influence the ranges of intervals and ratios of cardiac cycle phases.
5. Cardiac patients with ECG changes such as hypertensive heart disease and old myocardial infarction showed significant changes in IVCT, IVRT, PEP, PEP/LVET ratio comparing to those of normal subjects, suggesting cardiac preformance was disturbed in these diseases, whereas stable angina pectoris with no ECG changes showed no change of cardiac cN cle events, which suggested that there was no significant disturbance in cardiac performance at rest in stable angina pectoris.
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