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Toxoplasmic infection in cardiac disease
Insights
Toxoplasmosis infection is likely a common cause of heart disease, including arrhythmias and heart failure, in this community. Early diagnosis and treatment are crucial to prevent serious complications.
Area of Science:
- Cardiology
- Infectious Diseases
- Parasitology
Background:
- Heart disease presents with varied symptoms like arrhythmias, chest pain, pericarditis, and cardiac failure.
- Idiopathic heart disease often lacks a clear etiological diagnosis.
Purpose of the Study:
- To investigate the potential role of toxoplasmosis as a cause of heart disease in a specific community.
- To evaluate the clinical presentation, diagnosis, and treatment outcomes of toxoplasmosis-induced heart disease.
Main Methods:
- Retrospective analysis of 18 patients with unexplained heart disease.
- Serological testing for toxoplasmic infection (acute and chronic titers).
- Review of patient data, including symptoms, diagnostic findings, and treatment responses.
Main Results:
- Evidence of toxoplasmic infection found in all 18 patients.
- 17 patients showed chronically elevated toxoplasmosis titers, exceeding community and control levels.
- Common sources of infection identified: cats, undercooked meat, and congenital transmission.
Conclusions:
- Toxoplasmosis is a probable and significant cause of heart disease in the studied community.
- Clinical manifestations can be sporadic, even during chronic infection, due to cyst rupture.
- Treatment with pyrimethamine/sulfadiazine or tetracycline showed efficacy, but relapses and embolic events occurred.
Abstract:
In 18 patients who presented in less than 2 years with heart disease characterized by arrhythmias (including atrial fibrillation, ventricular arrhythmias and heart block), atypical chest pain, pericarditis and cardiac failure, extensive investigation revealed no cause for the disease except for evidence of toxoplasmic infection. One patient had acute toxoplasmosis; the other 17 patients had chronically increased titers, higher than the expected level in the community and also higher than in a control series of patients with well defined heart disease. Toxoplasmosis is probably a fairly common cause of heart disease in this community. The source of infection appeared to be cats, uncooked meat and congenital infection. Patients received chemotherapy with either pyrimethamine and sulfadiazine or tetracycline. Serious relapse occurrred in three patients and embolic complications in two. Experimental myocarditis occurs when toxoplasmic cysts rupture within the heart; therefore clinical symptoms may occur sporadically during a chronic infection.