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近年,左室収縮能のみならず拡張能を評価することにより早期の心機能障害を診断する試みがなされている1〜3)。非侵襲的な左心機能の評価方法としては,心プールスキャン,心エコー検査,心機図などがあげられるが,最近従来のγ—カメラを用いた心プールスキャン法のうち,左室time activity curve解析機能のみを分離発展させた,時間分解能に卓越せるcomputerized car—diac nuclear probe法が開発され,欧米では新しい心機能モニタリングシステムのひとつとして注目されている4,5)。
本研究の目的は心臓プローブ法による左室収縮・拡張動態分析の有用性を明らかにし,各種心疾患,とくに虚血性心疾患,高血圧症,anthracyclin系薬剤使用症例における左室収縮・拡張障害の実態を明らかにし、早期心機能障害の検索を試みることにある。
Evaluation of LV diastolic function as well as sys-tolic function has been suggested to be useful for the prediction of latent cardiac dysfunction. We measured LVEF, ER PFR and TPFR in 95 patients 38 ischemic [IHD], 34 hypertensives [HHD] and 23 anthracyclin (40~1000 mg/m2) treated [ADR]} using a computerized cardiac nuclear probe (CNP).
Reproducibility of CNP measures were LVEF (r= 0.96, p<0.001), ER (r=0.88, p<0.001), PFR (r= 0.91, p<0.001) and TPFR (r=0.80, p<0.01). LVEF by CNP correlated well with that by γ-camera (r= 0.82, p<0.001) and UCG (r=0.76, p<0.001). Im-paired systolic function and/or diastolic function were found in 50% and 91% of [IHD], 18% and 37% of [HHD], 43% and 52% of [ADR]. In [ADR] patients, cumulative dose of [ADR] significantly correlated with PFR (r=-0.75, p<0. 05), LVEF (r =-0.47, p<0. 05) and ER (r=-0.50, p<0. 05). PFR became significantly lower values in the cu-mulative dose of more than 300 mg/m2, while LVEF and ER in the dose of more than 550 mg/m2.
These results showed the high resolution temporal imaging capacity of CNP, and suggested earlier lowering of PFR would be useful for the identifica-tion of incipient cardiac dysfunction, especially cumulative dose (>300 mg/m2) dependent diastolic dysfunction in adriamycin cardiomyopathy.
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