Chagas heart disease: An overview of diagnosis, manifestations, treatment, and care

Table 5 American Heart Association Statement[1]

Classification	ECG/ Echocardiogram	HF	Digestive changes
A (Indeterminate form - patients at risk for developing HF)	Normal ECG	Neither structural cardiomyopathy or HF symptoms	No
B1	Structural cardiomyopathy evidenced by ECG or echocardiographic changes with normal LVEF	Neither current or previous signs and symptoms of HF
B2	Structural cardiomyopathy characterized by decreased LVEF	Neither current or previous signs and symptoms of HF
C	LV systolic dysfunction	Current or previous symptoms of HF (NYHA functional class I, II, III, or IV)
D		Refractory symptoms of HF at rest despite optimized clinical treatment requiring specialized interventions.

ECG: Electrocardiogram; HF: Heart failure; LVEF: Left ventricular ejection fraction; NYHA: New York Heart Association.