Causes and Mechanisms of Takotsubo Cardiomyopathy

Primary Triggering Factors

Emotional stressors are common precipitating events for takotsubo cardiomyopathy, particularly in postmenopausal women 1, 2
Physical stressors, including acute medical illness, surgery, or other physiological stress, can trigger the syndrome 1, 3
Postmenopausal status is a significant risk factor, with 96% of cases occurring in women ≥50 years of age 4, 5

Catecholamine surge is the primary proposed mechanism, with documented supraphysiological elevations of plasma catecholamines during acute episodes 4, 5
β2-adrenergic receptor signaling switch from Gs to Gi protein signaling occurs with high levels of circulating epinephrine, which is protective against apoptosis but causes negative inotropy 4, 5
Regional differences in adrenergic receptor density explain the characteristic apical involvement, as the ventricular apex has increased β2-adrenergic receptor density despite relatively sparse sympathetic innervation 4, 5
Microvascular vasospasm may contribute to the pathophysiology 4, 5
Impaired fatty acid metabolism has been implicated in the development of the syndrome 4, 5
Transient left ventricular outflow tract obstruction can occur and contribute to the clinical presentation 4, 5
Base-to-apex perfusion gradient differences in myocardial blood flow have been postulated as contributing factors 4, 5

Acute medical illness, including neurological conditions, respiratory failure, or sepsis, can trigger takotsubo cardiomyopathy 3, 6
Surgical procedures and other invasive medical interventions can trigger the syndrome 3, 6
Chemotherapy and other medications that affect catecholamine levels or sensitivity can trigger takotsubo cardiomyopathy 7
Endocrine disorders, including thyroid dysfunction, which can alter cardiovascular response to catecholamines, are associated with takotsubo cardiomyopathy 4, 8

Female predominance is observed, with approximately 90% of cases occurring in women 2
Mean age of 66.8 years, with most cases occurring in postmenopausal women 2
Pre-existing psychiatric disorders, such as anxiety and depression, may increase susceptibility 9
Absence of significant coronary artery disease is characteristic, though some patients may have incidental coronary atherosclerosis 7, 6

Apical ballooning is the classic presentation, but other patterns have been described 3, 7
Mid-ventricular variant with sparing of the apex and base 2, 7
Basal variant (inverse takotsubo) with hyperkinesis of the apex 7

The European Society of Cardiology suggests that sex hormones and the endocrine system play a key role in the pathophysiology of Takotsubo cardiomyopathy, with estrogen deficiency increasing vulnerability in postmenopausal women 10, 11
Pre-existing psychiatric disorders such as anxiety and depression increase susceptibility to Takotsubo cardiomyopathy, amplifying stress responses in affected patients 10, 11, 12, 13

The European Heart Journal highlights the link between the brain and heart as a key factor in Takotsubo cardiomyopathy, representing more than a purely cardiac disease and requiring an interdisciplinary approach 10, 11, 12, 13
There may be a genetic aspect to the pathophysiology of Takotsubo cardiomyopathy, with studies on circulating miRNAs suggesting a potential genetic predisposition 10, 11, 12, 13

The European Heart Journal notes that Takotsubo cardiomyopathy has morbidity and mortality rates comparable to acute coronary syndrome, contradicting earlier beliefs that it was benign 10, 11, 12, 13