Cardioprotective effects of amlodipine in the ischemic-repefused heart
dc.contributor.author | Hoff, Paul T. | en_US |
dc.contributor.author | Tamura, Yasuo | en_US |
dc.contributor.author | Lucchesi, Benedict Robert | en_US |
dc.date.accessioned | 2006-04-07T20:39:07Z | |
dc.date.available | 2006-04-07T20:39:07Z | |
dc.date.issued | 1989-11-07 | en_US |
dc.identifier.citation | Hoff, Paul T., Tamura, Yasuo, Lucchesi, Benedict R. (1989/11/07)."Cardioprotective effects of amlodipine in the ischemic-repefused heart." The American Journal of Cardiology 64(17): I101-I116. <http://hdl.handle.net/2027.42/27687> | en_US |
dc.identifier.uri | http://www.sciencedirect.com/science/article/B6T10-4C76D2S-17C/2/af3240207f29902a3ffb993e0ddcc8d7 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/27687 | |
dc.description.abstract | Amlodipine is a a dihydropyridine derivative belonging to the group of pharmacologic calcium entry blocking agents and is characterized as having a slow onset and relatively long duration of action with minimal effects on cardiac electrophysiology and myocardial contractility.The protective effect of amlodipine was studied in isolated blood-perfused feline hearts made globally ischemic for 60 minutes followed by reperfusion for 60 minutes. Ischemic-lnduced alterations of left ventricular developed pressure and compliance were monitored. In 11 control and 7 drug-treated hearts, amloipine produced significant decreases in myocardial oxygen consumption (6.2 +/- 0.4 to 4.4 +/- 0.4 ml oxygen/min/100 g) and coronary vascular resistance, as assessed by changes in perfusion pressure (120 +/- 1 to 100 +/- 4 mm Hg). Amlodipine administered before the onset of global ischemia decreased the development of ischemic contracture as reflected by a progressive increase in resting left ventricular diastolic pressure. The return of contractile function, 60 minutes after reperfusion, improved significantly in the amlodipine-treated group compared with controls, and there was better maintenance of the tissue concentration of Na+, Ca2+ and K+.A canine model of regional myocardial ischemia (90 minutes) followed by 6 hours of reperfusion was used to assess the cardioprotective effects of amlodyrine, 150 [mu]g/kg, administered 15 minutes before reperfusion. Infarct size, expressed as a percentage of the area at risk, was smaller in the amlodipine-treated group (n = 10) than in the control group (n = 10) (34.5 +/- 3.8% vs 45.9 +/- 2.8%, P = 0.027). Risk region size did not differ between groups and both groups were comparable with respect to the hemodynamic parameters of heart rate, blood pressure and rate-pressure product. Amlodipine prevented the gradual reduction in coronary blood flow observed in the control group.It is concluded that amlodipine reduces myocardial ischemic injury by mechanism(s) that may involve a reduction in myocardial oxygen demand as well as by positively influencing transmembrane Ca2+ fluxes during ischemia and reperfusion. | en_US |
dc.format.extent | 2068867 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Elsevier | en_US |
dc.title | Cardioprotective effects of amlodipine in the ischemic-repefused heart | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Internal Medicine and Specialties | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Pharmacology, The University of Michigan Medical School, Ann Arbor, Michigan, USA. | en_US |
dc.contributor.affiliationum | Department of Pharmacology, The University of Michigan Medical School, Ann Arbor, Michigan, USA. | en_US |
dc.contributor.affiliationum | Department of Pharmacology, The University of Michigan Medical School, Ann Arbor, Michigan, USA. | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/27687/1/0000071.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/0002-9149(89)90967-3 | en_US |
dc.identifier.source | The American Journal of Cardiology | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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