The effects of chronic oral milrinone therapy on early postinfarction left ventricular remodeling.
Publication/Presentation Date
9-1-1993
Abstract
Left ventricular remodeling following acute transmural myocardial infarction may result in early left ventricular enlargement. To characterize the effects of milrinone on components of early left ventricular dilation, rats (n = 120) underwent left coronary artery ligation or sham surgery. In the immediate postoperative period, rats received either no treatment or milrinone (3.17 +/- 0.08 mg/kg/day) dissolved in drinking water for 20 days. Twenty-one days after the initial surgery, hemodynamic measurements were made. The rats were then put to death and the hearts arrested in diastole were excised and fixed at a constant pressure for morphometric analysis. To examine the effects of milrinone on the relative contribution of infarcted and noninfarcted segments to early left ventricular dilation after acute myocardial infarction, a subgroup of infarcted rats chosen randomly was put to death 3 days after the initial surgery for morphometric analysis. Compared with infarcted untreated rats, infarcted milrinone-treated rats had a lower left ventricular volume (1.41 +/- 0.07 ml/kg vs 2.16 +/- 0.19 ml/kg, p < 0.001), lower left ventricular wall stress (0.64 +/- 0.03 vs 0.91 +/- 0.06, p < 0.001), and a lower expansion index (1.61 +/- 0.12 vs 2.61 +/- 0.22, p < 0.001). Morphometric analysis revealed that the noninfarcted segment length did not differ between the two infarcted groups either 3 days or 21 days after left coronary artery ligation. Infarct segment length also did not differ between the two infarcted groups at 3 days, but at 21 days infarct segment was shorter in the milrinone-treated group compared with the untreated group (p < 0.03).(ABSTRACT TRUNCATED AT 250 WORDS)
Volume
126
Issue
3 Pt 1
First Page
543
Last Page
551
ISSN
0002-8703
Published In/Presented At
Jain, P., Hughes, M., Korlipara, G., Lillis, O., Dervan, J. P., & Cohn, P. F. (1993). The effects of chronic oral milrinone therapy on early postinfarction left ventricular remodeling. American heart journal, 126(3 Pt 1), 543–551. https://doi.org/10.1016/0002-8703(93)90402-u
Disciplines
Medicine and Health Sciences
PubMedID
8362707
Department(s)
Department of Medicine
Document Type
Article