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• W2519859619 abstract "Takotsubo cardiomyopathy (TCM) is an intriguing phenomenon characterized by transient and reversible left ventricular (LV) dysfunction despite angiographically unobstructed coronary arteries. The detailed pathophysiology of stunned, viable myocardium in TCM remains to be determined. Post-extrasystolic potentiation (PESP), the phenomenon of enhanced LV contractility following extrasystole, has been used to assess myocardial viability.Utilizing a local database, we identified 74 cases that met the modified Mayo Clinic criteria for TCM between October 2004 and March 2016. The patients undergoing left ventriculography were assessed for the presence of fortuitously provoked extrasystoles and the presence or absence of PESP.The baseline characteristics of TCM were 93.2% female patients with median age of 69 and majority cases were apical type (77%). In-hospital mortality was observed in 3 cases (4.1%), all of which were apical type. We observed improved ejection fraction after extrasystole compared to baseline, however stunned myocardium had minimal PESP whereas unaffected myocardium showed marked potentiation.Extrasystoles in TCM failed to elicit PESP in affected LV segments despite viability in those segments, in turn implicating a calcium handling abnormality in TCM. Potential explanations of our results may be that catecholamine excess caused maximum calcium release so that an extrasystole could not enhance contractility any further, or that there is a regional insensitivity to calcium release due to a disturbance of the calcium regulatory system at the molecular level despite the bolus of calcium availability provided by the extrasystole." @default.
• W2519859619 created "2016-09-23" @default.
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• W2519859619 date "2016-12-01" @default.
• W2519859619 modified "2023-09-24" @default.
• W2519859619 title "Absence of post-extrasystolic potentiation in takotsubo cardiomyopathy: Another piece of the puzzle?" @default.
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• W2519859619 doi "https://doi.org/10.1016/j.ijcard.2016.09.058" @default.
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