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要旨 アンジオテンシン変換酵素阻害薬投与中の慢性心不全患者にアンジオテンシンII受容体拮抗薬ロサルタンまたはバルサルタンを追加投与し,神経体液性因子に及ぼす影響を比較検討した.ロサルタン50mg追加投与群12例とバルサルタン80mg追加投与群7例において,追加投与前および投与4週後に,血漿ノルエピネフリン濃度,血漿レニン活性,血漿アルドステロン濃度,血漿心房性ナトリウム利尿ペプチド濃度,血漿脳性ナトリウム利尿ペプチド濃度を測定し,両群間で比較した.ロサルタン群,バルサルタン群ともに追加投与後に血漿ノルエピネフリン濃度と血漿アルドステロン濃度の有意な低下を認めたが,両群間に有意差はなかった.AT 1受容体への選択性が異なるロサルタンとバルサルタンが,通常量の短期投与で,慢性心不全患者の神経体液性因子を同程度に改善させる可能性が示唆された.
We examined neurohumoral effects of an angiotensin II receptor blocker, losartan or valsartan, added to an angiotensin converting enzyme inhibitor in patients with chronic heart failure. Plasma norepinephrine, aldosterone, and atrial and brain natriuretic peptide concentration, and plasma renin activity were measured beforeand 4 weeks after losartan (50mg/day) or valsartan (80mg/day) treatment, and compared between the losartan group (n=12) and the valsartan group (n= 7). There were significant reductions in plasma norepinephrine and aldosterone concentration in both groups, but not significant differences between the groups. It is suggested that low-dose and short-term treatment with losartan or valsartan may improve neurohumoral parameters in patients with chronic heart failure to the same degree and independent of the affinity for the AT 1 receptor.
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