“…Several echo-parameters were tested previously 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 for clinical outcome prediction in patients with HF. Different indices were also, proposed as predictors of survival 11 , 12 , 13 , 14 , 15 , 16 , 17 , quality of life 11 , 12 , 13 , 14 , 15 and exercise capacity 22 , 23 , 24 , 25 , 26 in these patients. Six-minute walk test (6-MWT) has been introduced as an accurate tool for assessing exercise capacity in HF patients, being safe, simple to perform and its results can predict clinical outcomes 18 , 19 , 20 , 21 .…”