PURPOSE: The 6-9 minute walking test was used in this study to evaluate the impact of these drugs on functional capacity of patients admitted to the Hospital because of Heart Failure (CHF). METHODS: Ten patients (5 males and 5 females) with mean age of 47 years and NYHA CHF functional class III or IV underwent a 6-9 minute walking test at admission and on the day of discharge from the Hospital. The following parameters were evaluated both at admission and discharge: body weight, echocardiography-derived LV dimensions and function, plasmatic levels of sodium, potassium, BUN, creatinine, hemoglobin and hematocrit. Treatment consisted of increasing outpatient dose of furosemide (IV and/or PO) plus the association of thiazide if necessary. The previous dose regimen of digitalis, ACE inhibitors or the association nitrate and hydralazine was kept unchanged. RESULTS: Time to compensation of CHF varied from 4 to 30 days (mean 8.7±7.8 days). LV end diastolic dimension varied from 47 to 81mm. LV EF spanned from 0.26 to 0.74. The 6min walking distance improved from 193.4± 71.5m to 341.8±67.7m (p<0.00002) and the 9min walking distance from 268.1±119.6m to 518.0±114.8m (p<0.00005). Hemoglobin, hematocrit, BUN, creatinine and sodium levels were unchanged from admission to discharge, whereas plasma potassium level increased from 4.0±0.91mEq/l to 4.69±1.00mEq/l (p=0.01), and body weight was reduced from 58.9±6.42kg to 52.9±5.31kg (p<0.0006). CONCLUSION: Compensating CHF with diuretics leads to a significant improvement in physical capacity. This benefit is already evident in the in-hospital phase.
heart failure; diuretics; six minute walk test
