Cardiovascular and Noncardiovascular Prescribing and Mortality After Takotsubo: Comparison With Myocardial Infarction and General Population

BACKGROUND: Takotsubo syndrome is an increasingly common cardiac emergency with no known evidence-based treatment.

OBJECTIVES: To investigate cardiovascular mortality and medication use after takotsubo syndrome.

METHODS: In a case-control study, all patients with takotsubo syndrome in Scotland between 2010-2017 (n=620) were age, sex and geographically matched to individuals in the general population (1:4, n=2,480) and contemporaneous patients with acute myocardial infarction (1:1, n=620). Electronic health record data linkage of mortality outcomes and drug prescribing were analysed using Cox proportional hazard regression models.

RESULTS: Of the 3,720 study participants (mean age, 66 years; 91% women), 153 (25%) patients with takotsubo syndrome died over the median of 5.5 years follow up. This exceeded mortality rates in the general population [374 (15%)]; hazard ratio [HR] 1.78 [95% confidence interval 1.48-2.15], P<0.0001), especially for cardiovascular (HR 2.47, [1.81-3.39], P<0.001) but also non-cardiovascular (HR 1.48 [1.16-1.87], P=0.002) deaths. Mortality rates were lower for patients with takotsubo syndrome than those with myocardial infarction (31%, 195/620; HR 0.76 [0.62-0.94], P=0.012), which was attributable to lower rates of cardiovascular (HR 0.61 [0.44-0.84], P=0.002) but not non-cardiovascular (HR 0.92 [0.69-1.23], P=0.59) deaths. Despite comparable medications use, cardiovascular therapies were consistently associated with better survival in patients with myocardial infarction but not in those with takotsubo syndrome. Diuretic (P=0.01), anti-inflammatory (P=0.002) and psychotropic (P<0.001) therapies were all associated with worse outcomes in patients with takotsubo syndrome.

CONCLUSIONS: In patients with takotsubo syndrome, cardiovascular mortality is the leading cause of death, and this is not associated with cardiovascular therapy use.