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[Indeterminate form of Chagas disease: considerations about diagnosis and prognosis]
1Hospital das Clínicas e na Faculdade de Medicina da Universidade Federal de Minas Gerais. antonior@net.em.com.br
Insights
The indeterminate form of Chagas' disease may not have a benign prognosis, as advanced tests reveal cardiac abnormalities. Reappraising diagnostic criteria and interventions is crucial for managing this Trypanosoma cruzi infection.
Area of Science:
- Infectious Diseases
- Cardiology
- Parasitology
Context:
- Chagas' disease, caused by Trypanosoma cruzi, presents an indeterminate form with no overt clinical signs.
- Despite a historically benign prognosis, advanced cardiovascular tests reveal subclinical abnormalities in these patients.
- Current diagnostic criteria for the indeterminate form are simple but may lack sensitivity.
Purpose:
- To re-evaluate the concept and prognosis of the indeterminate form of Chagas' disease.
- To highlight diagnostic challenges and the potential for cardiac involvement.
- To advocate for revised diagnostic criteria and therapeutic strategies.
Summary:
- The indeterminate form of Chagas' disease is characterized by the absence of clinical, radiological, and electrocardiographic evidence of cardiac or digestive compromise in Trypanosoma cruzi-infected individuals.
- However, advanced cardiovascular testing can reveal significant abnormalities, challenging the notion of a universally benign prognosis.
- A substantial proportion of patients may develop cardiomyopathy over time, and sudden death can occur, underscoring the need for reassessment.
Impact:
- Reappraising the indeterminate form concept is necessary for accurate risk stratification and management.
- Individualized risk assessment using clinical and noninvasive evaluations can identify high-risk groups.
- Reconsidering the role of etiologic treatment in preventing Chagas' disease-related cardiomyopathy is essential.
Abstract:
The indeterminate form of Chagas' disease is defined by the absence of clinical, radiological and electrocardiographic manifestations of cardiac or digestive involvement in Trypanosoma cruzi chronic infected persons. When submitted to advanced cardiovascular tests, these patients may present significant abnormalities. However, the indeterminate form concept was reaffirmed as valid, since diagnostic criteria are simple and prognosis is benignant. In clinical practice, diagnostic difficulties are frequent, related to subjectivity and uncertain meaning of clinical, electrocardiographic and radiological findings. Moreover, indeterminate form prognosis is not equally good: after five to 10 years, a third of patients will have cardiopathy. Sudden death, a rare complication, may be the first manifestation of Chagas' disease. It is necessary to reappraise indeterminate form concept, redefining diagnostic criteria and therapeutic management. Clinical and noninvasive evaluation may allow individual risk stratification; therapeutic interventions may be beneficial in high risk groups. Since etiologic treatment may prevent cardiopathy, its role in indeterminate form management must be reassessed.