Background
Cardiovascular events (CEs) remain the leading cause of death in patients with tetanus. We examined the incidence, patterns, and associated predictors of CEs among patients admitted to a tertiary hospital in southern Vietnam.
Methods
An ambidirectional cohort study was conducted on hospitalized adult patients with tetanus at the Hospital for Tropical Diseases between 2019 and 2020. Inclusion criteria included aged ≥16 years with a clinical diagnosis of tetanus and without CEs at admission. In the prospective phase of the study, eligible patients who refused to participate were excluded from the study. Information on demographics, tetanus disease, CEs and outcomes were collected. A multivariable logistic regression model was developed to evaluate risk factors for CEs.
Results
Among all 572 included patients, 10.8% (95%CI 8.6-13.7%) experienced a CE, which included Takotsubo cardiomyopathy (40.3%, 95%CI 29.0-52.8%), arrhythmia (19.4%, 95%CI 11.4-30.9%), sudden cardiac arrest (16.1%, 95%CI 9.0-27.2%), myocardial infarction (11.3%, 95%CI 5.6-21.5%), heart failure (6.5%, 95%CI 2.5-15.4%) and pulmonary embolism (6.5%, 95%CI 2.5-15.4%). CEs occurred from day 5 to 20 of illness. Among 62 CE patients, 21% (95%CI 12.7-32.6%) died and 61.3% (95%CI 48.9-72.4%) developed autonomic nervous system dysfunction (ANSD). Three-fourths (24/32) of patients with Takotsubo cardiomyopathy or myocardial infarction had ANSD. Patients with high modified Ablett scores and underlying diseases were more likely to experience CEs than those without severe tetanus and comorbidities. However, overweight individuals were less likely to experience CEs compared to individuals who were underweight or have normal weight.
Conclusions
In individuals with tetanus, CEs are not rare and associated with high mortality. The most common CE is Takotsubo cardiomyopathy. CEs can occur at any stage of illness, with or without ANSD. To prevent mortality, it is pivotal to screen CEs in patients with tetanus, especially those with underlying diseases, high modified Ablett scores, and a normal or low BMI. More studies are needed to fully elucidate the impact of ANSD on the cardiovascular function and the CE associated mortality in tetanus.