Combined treatment with ramipril and metoprolol prevents changes in the creatine kinase isoenzyme system and improves hemodynamic function in rat hearts after myocardial infarction.

Abstract:

:Beneficial effects of monotherapy with ACE inhibitors or beta-blockers on hemodynamic function after myocardial infarction are well known. Until now, the effects of combined treatment on cardiac function and energy metabolism have been poorly described. This study examines the effects of combined ramipril and metoprolol treatment on the creatine kinase (CK) system and hemodynamic function in rats after infarction. Wistar rats with experimental infarction were randomized for treatment with ramipril (R), metoprolol (M), combined treatment (MR), or placebo (P). Sham-operated (SO) animals served as controls. After 6 weeks, we assayed for CK isoenzymes and performed hemodynamic measurements. In P versus SO, left ventricular systolic pressures (dp/dt(max) and dp/dt(min)) diminished, whereas left ventricular end-diastolic pressure (LVEDP) increased. Decreased total CK activity and mitochondrial CK isoenzyme, increased CK-MB, and increased CK-BB isoenzymes were measured in P versus SO. With infarct size < or =45%, mitochondrial CK increased in M and R versus P. Combined treatment had an additional enhancing effect on mitochondrial CK isoenzyme level versus M and R, decreased LVEDP versus P, as well as increased dp/dt(max) and dp/dt(min) versus R. These results provide evidence of an interaction between normalization of energy metabolism and improvement in cardiac function due to a combination of ACE inhibition and beta blockade after myocardial infarction.

journal_name

Cardiovasc Drugs Ther

authors

Theres HP,Wagner KD,Romberg D,Feig C,Strube S,Leiterer KP,Günther J,Stangl K,Baumann G,Schimke I

doi

10.1023/a:1007846311040

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

597-606

issue

6

eissn

0920-3206

issn

1573-7241

journal_volume

14

pub_type

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