Takotsubo Cardiomyopathy Causes and Characteristics

Primary Triggering Factors

Emotional stressors, such as grief, fear, extreme anger, or sudden surprise, are common precipitating events, particularly in postmenopausal women 1
Physical stressors, including acute medical illness, surgery, respiratory failure, or sepsis, can trigger the syndrome 1
Postmenopausal status is a significant risk factor, with 96% of cases occurring in women ≥50 years of age and a mean age of 65 years 2, 1

Catecholamine surge is the primary proposed mechanism, with documented supraphysiological elevations of plasma catecholamines during acute episodes 2, 1
β2-adrenergic receptor signaling switch from Gs to Gi protein signaling occurs with high circulating epinephrine levels, causing negative inotropy but protecting against apoptosis 3
Regional differences in adrenergic receptor density explain the characteristic apical involvement, as the ventricular apex has increased β2-adrenergic receptor density 2, 1
Microvascular vasospasm contributes to the pathophysiology by causing regional myocardial hypoperfusion 1
Impaired fatty acid metabolism has been implicated in the development of the syndrome 3
Transient left ventricular outflow tract obstruction can occur and contribute to the clinical presentation 3
Base-to-apex perfusion gradient differences in myocardial blood flow have been postulated as contributing factors 3

Female predominance is observed, with approximately 90% of cases occurring in women 1
Postmenopausal status is the most significant demographic risk factor 2
Absence of significant coronary artery disease is characteristic, though some patients may have incidental coronary atherosclerosis 1
Circadian variation may be present, with many episodes occurring in the early morning 4

Apical ballooning is the classic presentation, affecting the mid and apical segments of the left ventricle 5
Mid-ventricular variant with sparing of the apex and base 1
Basal variant (inverse takotsubo) with hyperkinesis of the apex 1
Right ventricular involvement is common in many cases 4

Life-threatening ventricular arrhythmias, such as torsades de pointes, ventricular tachycardia, or ventricular fibrillation, occur in 3.0–8.6% of cases 5
QT interval prolongation occurs in up to half of patients and is associated with increased risk of arrhythmias 5
Recurrence occurs in approximately 5% of cases, typically 3 weeks to 3.8 years after the first event 5