51. Dysautonomia and ventricular dysfunction in the indeterminate form of Chagas disease
- Author
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Beatriz Bojikian Matsubara, Jose Luiz Cassolato, Leonardo A. M. Zornoff, Domingos Alves Meira, Sergio A. R. Paiva, João Carlos Hueb, Silméia Garcia Zanati, and Roberta B. G Molina
- Subjects
Adult ,Male ,medicine.medical_specialty ,Diastole ,Asymptomatic ,Severity of Illness Index ,Internal medicine ,medicine ,Ventricular Dysfunction ,Heart rate variability ,Humans ,Chagas Disease ,Retrospective Studies ,Ejection fraction ,Tricuspid valve ,business.industry ,Dysautonomia ,Middle Aged ,Myocardial Contraction ,Echocardiography, Doppler ,medicine.anatomical_structure ,Autonomic Nervous System Diseases ,Ventricle ,Circulatory system ,Cardiology ,Electrocardiography, Ambulatory ,Female ,medicine.symptom ,Cardiology and Cardiovascular Medicine ,business ,Blood Flow Velocity ,Follow-Up Studies - Abstract
The associations between autonomic function and biventricular function in patients with the indeterminate form of Chagas disease remains to be elucidated.In 42 asymptomatic patients and 19 healthy volunteers, the autonomic function was assessed by time domain indices of heart rate variability (HRV), analyzed for 24 h; the right ventricular function was assessed by fraction area change, right ventricle shortening, and systolic excursion of the tricuspid valve; and the left ventricular function was assessed by ejection fraction and transmitral flow velocities. Data were expressed as mean+/-SD or medians (including the lower quartile and upper quartile). Groups were compared by Student's t or Mann-Whitney U test. Autonomic and ventricular function were correlated by Pearson's or Spearman's correlation coefficient. The level of significance was 5%.Right and left ventricular systolic function indexes were comparable between groups. Transmitral flow velocities were decreased in the Chagas disease group (p0.05). The patients presented impaired HRV as indicated by the values of SDNN-day (80 (64-99) ms vs. 98 (78-127) ms; p=0.045), SDNNI-24 h (54 (43-71) vs. 65 (54-105) ms; p=0.027), SDNNI-day (49 (42-64) vs. 67 (48-76) ms; p=0.045), pNN50-day (2.2 (0.7-5)% vs. 10 (3-11)%; p=0.033); and pNN50-24 h (3 (1-7)% vs. 12 (8-19)%; p=0.013). There were no correlations between the left ventricular diastolic indices and autonomic dysfunctional indices (p0.05).Patients with the indeterminate form of Chagas disease have both dysautonomia and left ventricular diastolic dysfunction. However, the right ventricular function is preserved. Importantly, ventricular diastolic dysfunction and dysautonomia are independent phenomena.
- Published
- 2005