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冠動脈疾患慢性期での冠動脈病変と安静時左室収縮機能との関連性については多くの報告があるが1〜5),左室拡張機能との関連性についての報告は少なく,今まで左室収縮機能が障害される以前に拡張機能が障害されることが実験的に6,7),またヒト左室全体機能についても8,9),報告されてきたが,それがヒト左室局所機能においても認められるか,どのような冠動脈疾患群に起こるかは不明であった。また心房ペーシング時の左室機能変化が冠動脈病変重症度とどう関連するか,狭心症群と心筋梗塞群との反応性の差異はどうかなどについての解明も十分ではなかった。本研究では上記の点を明らかにすることを目的として,冠動脈病変と安静時および心房ペーシング時の左室機能との関連性を検討した。
Left ventriculography by cardiac catheterization at rest and/or during right atrial pacing was performed in 123 patients with coronary heart disease. Left ventri-cular global systolic, global diastolic, regional systolic and regional diastolic function were measured by ejec-tion fraction (EF), filling ratio at the first-third of the diastole (ER), segmental ejection fraction (SEF, area method) and segmental filling ratio (SFR), respective-ly. The severity of the coronery artery narrowing was estimated by narrowing in diameter and the length of the stenosis (Pujadas' grade). The alteration in left ventricular function as influenced by coronary arterial narrowing was thus studied.
It was observed with respect to global function that FR appeared already abnormal in angina pectoris with three vessel disease without the decrement of EF. To ex-clude the effect due to other coronary stenosis we studied regional function in one vessel disease (left anterior descending artery), in which we observed that SFR was already decreased in mild stenosis (3 of Pujadas' grade) without the decrement of SEF.
Right atrial pacing deteriorated SEF more remarkably in angina pectoris than in myocardial infarction.
It was concluded that 1) left ventricular diastolic function is more sensitive than systolic function in not only global function but also regional function, and that 2) the deterioration of left ventricular regional systolic function during atrial pacing is more remarkable in angina pectoris than in myocardial infarction.
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