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• W1965475935 abstract "Takotsubo cardiomyopathy (TC) is characterized by transient hypokinesis of the left ventricular apex or midventricular segments with coronary arteries without significant stenosis. It is often associated with emotional or physical stress; however, its pathophysiology is still unclear. In the present study, we analyzed the alterations in blood viscosity and markers of endothelial damage induced by sympathetic stimulation in patients with previous TC. Seventeen women (mean age 71 years) with previous TC, included and investigated in the TC Tuscany Registry, were compared to a control group of 8 age- and risk factor-matched women with chest pain and coronary arteries free of stenosis. All subjects underwent the cold pressor test (CPT). Before and after the CPT, the hemorheologic parameters (whole blood viscosity at 0.512 s−1 and 94.5 s−1, plasma viscosity, erythrocyte deformability index, and erythrocyte aggregation), catecholamines, plasminogen activator inhibitor-1 (PAI-1), and von Willebrand factor levels were assessed. The patients with TC had significantly greater baseline PAI-1 levels (p <0.01) and lower erythrocyte deformability index values (p <0.01). After CPT, both the patients with TC and the controls had a significant increase in several hemorheologic parameters, catecholamines, and von Willebrand factor levels and a decrease in erythrocyte deformability index. However, the PAI-1 levels were significantly increased only in the patients with TC. Compared to the controls, the patients with TC had significantly greater values of whole blood viscosity at 94.5 s−1 (p <0.05), PAI-1 (p <0.01), von Willebrand factor (p <0.05) and lower erythrocyte deformability index values (p <0.01) after CPT. In conclusion, the results of the present study suggest that in patients with TC, the alterations in erythrocyte membranes and endothelial integrity induced by catecholaminergic storm could determine microvascular hypoperfusion, possibly favoring the occurrence of left ventricular ballooning. Takotsubo cardiomyopathy (TC) is characterized by transient hypokinesis of the left ventricular apex or midventricular segments with coronary arteries without significant stenosis. It is often associated with emotional or physical stress; however, its pathophysiology is still unclear. In the present study, we analyzed the alterations in blood viscosity and markers of endothelial damage induced by sympathetic stimulation in patients with previous TC. Seventeen women (mean age 71 years) with previous TC, included and investigated in the TC Tuscany Registry, were compared to a control group of 8 age- and risk factor-matched women with chest pain and coronary arteries free of stenosis. All subjects underwent the cold pressor test (CPT). Before and after the CPT, the hemorheologic parameters (whole blood viscosity at 0.512 s−1 and 94.5 s−1, plasma viscosity, erythrocyte deformability index, and erythrocyte aggregation), catecholamines, plasminogen activator inhibitor-1 (PAI-1), and von Willebrand factor levels were assessed. The patients with TC had significantly greater baseline PAI-1 levels (p <0.01) and lower erythrocyte deformability index values (p <0.01). After CPT, both the patients with TC and the controls had a significant increase in several hemorheologic parameters, catecholamines, and von Willebrand factor levels and a decrease in erythrocyte deformability index. However, the PAI-1 levels were significantly increased only in the patients with TC. Compared to the controls, the patients with TC had significantly greater values of whole blood viscosity at 94.5 s−1 (p <0.05), PAI-1 (p <0.01), von Willebrand factor (p <0.05) and lower erythrocyte deformability index values (p <0.01) after CPT. In conclusion, the results of the present study suggest that in patients with TC, the alterations in erythrocyte membranes and endothelial integrity induced by catecholaminergic storm could determine microvascular hypoperfusion, possibly favoring the occurrence of left ventricular ballooning." @default.
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• W1965475935 date "2013-05-01" @default.
• W1965475935 modified "2023-10-16" @default.
• W1965475935 title "Stress-Induced Hyperviscosity in the Pathophysiology of Takotsubo Cardiomyopathy" @default.
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• W1965475935 doi "https://doi.org/10.1016/j.amjcard.2013.01.304" @default.
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