Cognitive impairment in human chronic Chagas' disease

Area of Science:

• Neurology
• Infectious Diseases
• Neuropsychology

Background:

• Chronic Chagas' disease (CCD) is a neglected tropical disease with potential neurological complications.
• Subclinical cognitive impairment in CCD has not been extensively studied.
• Understanding cognitive deficits is crucial for managing long-term patient outcomes.

Purpose of the Study:

• To investigate subclinical cognitive impairment in patients with chronic Chagas' disease.
• To compare the neuropsychological performance of CCD patients with matched controls.
• To identify specific cognitive domains affected by CCD.

Main Methods:

• Neuropsychological assessment of 45 CCD patients and 26 controls using Mini Mental State Exam (MMSE), Weschler Memory Scale (WMS), and Weschler Adult Intelligent Scale (WAIS).
• Statistical analysis included non-parametric tests, Chi2, and multivariate statistics.
• Matched controls were selected based on age, education, place, and years of residency in endemic areas.

Main Results:

• Chagasic patients demonstrated significantly lower MMSE scores, particularly in orientation and attention.
• Reduced Weschler Memory Scale (WMS) scores and Weschler Adult Intelligent Scale (WAIS) IQ were significantly associated with CCD.
• Affected WAIS subtests included digit symbol, picture completion, picture arrangement, and object assembly, indicating deficits in non-verbal reasoning and information processing speed.

Conclusions:

• Chronic Chagas' disease is associated with significant subclinical cognitive impairment.
• The observed cognitive dysfunction, including impaired non-verbal reasoning and processing speed, resembles that seen in white matter diseases.
• Further research is warranted to explore the underlying mechanisms and potential interventions for cognitive deficits in CCD.