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A comparison of two progestins on myocardial ischemia-reperfusion injury in ovariectomized monkeys receiving estrogen therapy. | LitMetric

AI Article Synopsis

Article Abstract

Objective: It has been reported that the progestin medroxyprogesterone acetate (MPA), but not norethindrone acetate (NETA), inhibits the beneficial vascular effects of post-menopausal estrogen therapy, but their effects on the myocardium are unclear. The goal of this study is to compare the effects of these two progestins on post-ischemic myocardial damage.

Methods: Ovariectomized monkeys were fed an atherogenic diet for 18 months while receiving, or not receiving (control, n=15), the monkey equivalent to a woman's dose of 5 mug ethinyl estradiol with either 1 mg NETA daily (n=15) or 2.5 mg MPA daily (n=15). The left anterior descending coronary artery was occluded for 1 h and then released to allow myocardial reperfusion for 4 h. Infarct size was quantified using the histochemical stain triphenyl-tetrazolium chloride. Regional myocardial blood flow was measured by 15 mum neutron-activated microspheres, blood pressure and heart rates with a pneumatic cuff, stroke volume by echocardiography, coronary output by thermodilution and neutrophil accumulation in the myocardium using myeloperoxidase (MPO) activity.

Results: The infarct size (area of necrosis/area at risk) was similar between the control group (21+/-3%) and the MPA group (29+/-3%) (P<0.05) but significantly less in the NETA group (3+/-2%) than other groups (P<0.05). The hemodynamic myocardial function and regional myocardial blood values were similar among groups before, during and 4 h after reperfusion (all P-values >0.05). Similarly, there were no treatment effects on MPO activity (P>0.05).

Conclusions: NETA, but not MPA, diminished ischemia-reperfusion injury in estrogen-treated post-menopausal females. The mechanism(s) of this difference remains unclear.

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http://dx.doi.org/10.1097/00019501-200508000-00007DOI Listing

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