Inclusion Criteria:  Diagnosis of TTS according to current International consensus criteria Written informed consent Age 18 years and over  Exclusion Criteria:  Secondary form of TTS (e.g. as it can occur after sepsis, neurological disorders, pheochromocytoma) Durg-induced form of TTS (e.g. after administration of drugs such as dopamine, dobutamine, epinephrine, or norepinephrine)