首页> 外文期刊>American Journal of Physiology >Treatment of subclinical hypothyroidism reverses ischemia and prevents myocyte loss and progressive LV dysfunction in hamsters with dilated cardiomyopathy.
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Treatment of subclinical hypothyroidism reverses ischemia and prevents myocyte loss and progressive LV dysfunction in hamsters with dilated cardiomyopathy.

机译:亚临床甲状腺功能减退症的治疗可以逆转缺血并预防扩张型心肌病的仓鼠心肌细胞丢失和进行性LV功能障碍。

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Growing evidence suggests that thyroid dysfunction may contribute to progression of cardiac disease to heart failure. We investigated the effects of a therapeutic dose of thyroid hormones (TH) on cardiomyopathic (CM) hamsters from 4 to 6 mo of age. CM hamsters had subclinical hypothyroidism (normal thyroxine, elevated TSH). Left ventricular (LV) function was determined by echocardiography and hemodynamics. Whole tissue pathology and isolated myocyte size and number were assessed. TH treatment prevented the decline in heart rate and rate of LV pressure increase and improved LV ejection fraction. The percentage of fibrosisecrosis in untreated 4-mo-old CM (4CM; 15.5 +/- 2.2%) and 6-mo-old CM (6CM; 21.5 +/- 2.4%) hamsters was pronounced and was reversed in treated CM (TCM; 11.9 +/- 0.9%) hamsters. Total ventricular myocyte number was the same between 4- and 6-mo-old controls but was reduced by 30% in 4CM and 43% in 6CM hamsters. TH treatment completely prevented further loss of myocytes in TCM hamsters. Compared with age-matched controls, resting and maximum coronary blood flow was impaired in 4CM and 6CM hamsters. Blood flow was completely normalized by TH treatment. We conclude that TH treatment of CM hamsters with subclinical hypothyroidism normalized impaired coronary blood flow, which prevented the decline in LV function and loss of myocytes.
机译:越来越多的证据表明,甲状腺功能障碍可能导致心脏病发展为心力衰竭。我们调查了治疗剂量的甲状腺激素(TH)对4至6个月大的心肌病(CM)仓鼠的影响。 CM仓鼠患有亚临床甲状腺功能减退症(甲状腺素正常,TSH升高)。通过超声心动图和血流动力学测定左心室(LV)功能。评估整个组织病理学和分离的肌细胞大小和数量。 TH治疗可防止心率下降和左室压力增加率,并改善左室射血分数。在未治疗的4个月大的CM(4CM; 15.5 +/- 2.2%)和6个月大的CM(6CM; 21.5 +/- 2.4%)仓鼠中,纤维化/坏死的百分比显着并在治疗的CM中逆转(TCM; 11.9 +/- 0.9%)仓鼠。在4和6个月大的对照组中,总的心室肌细胞数量是相同的,但在4CM的仓鼠中降低了30%,在6CM的仓鼠中降低了43%。 TH处理完全防止了中医仓鼠心肌细胞的进一步损失。与年龄相匹配的对照组相比,4CM和6CM仓鼠的静息和最大冠状动脉血流受损。 TH治疗使血流完全恢复正常。我们得出的结论是,亚临床甲状腺功能减退症对TH CM仓鼠的治疗可以使冠状动脉血流正常化,从而防止LV功能下降和心肌细胞丢失。

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