The Importance of the Double Product in the Six-Minute Walk Test to Predict Myocardial Function

Figure 4

(a) Relationship between the left ventricular ejection fraction and the severity of reported symptoms during walking test (NYHA class). Number of patients for second NYHA class was 204, for third NYHA class was 77, and for fourth NYHA class was 11. Data are presented as mean ± SEM. means p <0.05

(b) Relationship between walking test distance and the severity of reported symptoms (NYHA class). Number of patients for second NYHA class was 204, for third NYHA class was 77, and for fourth NYHA class was 11. Data are presented as mean ± SEM. means p <0.05