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| Content Provider | Springer Nature Link |
|---|---|
| Author | Machackova, Jarmila Sanganalmath, Santosh K. Barta, Judit Dhalla, Ken S. Dhalla, Naranjan S. |
| Copyright Year | 2009 |
| Abstract | This study investigated whether improvement in cardiac function and attenuation of cardiac remodeling by some β-adrenoceptor (β-AR) antagonists were associated with a depression in sympathetic activity in congestive heart failure (CHF) due to myocardial infarction (MI). Although cardiac dysfunction, hypertrophy and dilatation as well as increased plasma level of catecholamines are known to occur in CHF, the relationship between these parameters is poorly understood. Three weeks after occlusion of the coronary artery, rats were treated daily with 20 and 75 mg/kg of either atenolol or propranolol for 5 weeks. Sham-operated rats served as controls. Both atenolol and propranolol at 20 and 75 mg/kg doses attenuated the MI-induced cardiac hypertrophy, increases in left ventricular (LV) end-diastolic pressure, LV end-systolic volume and LV end-diastolic volume as well as depressions in LV systolic pressure, LV fractional shortening and cardiac output. PR interval was decreased and QT$_{c}$ interval was increased in CHF; these alterations were ameliorated by both atenolol and propranolol. The increased level of plasma epinephrine in CHF was also depressed by both low and high doses of atenolol and propranolol whereas the increased level of plasma norepinephrine was reduced by high but not low doses of these drugs. The results indicate that the beneficial effects of β-AR antagonists on cardiac remodeling and heart dysfunction in CHF may be due to the blockade of β-ARs in the myocardium and a depression in the sympathetic activity. |
| Starting Page | 9 |
| Ending Page | 16 |
| Page Count | 8 |
| File Format | |
| ISSN | 15307905 |
| Journal | Cardiovascular Toxicology |
| Volume Number | 10 |
| Issue Number | 1 |
| e-ISSN | 15590259 |
| Language | English |
| Publisher | Humana Press Inc |
| Publisher Date | 2009-12-01 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Cardiac dysfunction Plasma catecholamines β-Adrenoceptor antagonists Cardiac hypertrophy and failure Cardiology Pharmacology/Toxicology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Molecular Biology Toxicology Cardiology and Cardiovascular Medicine |
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