<正> Objective: To investigate the clinical value of QT dispersion （QTd） and the effects of 6-minute walk test （6-MWT） mimicking the patients’daily activities on QTd in patients with congestive heart failure （CHF）. Methods: Twenty-eight CHF patients and 22 normal subjects participated these study

who all completed 6-MWT without developing severe arrhythmias. Before and after 6-MWT

standardized 12-lead surface ECGs were obtained to measure QTd and corrected QTd （QTcd）. Results: Both before and after 6-MWT

the QTd and QTcd in CHF patients were longer than those in the controls （ P < 0. 001）

and QTd and QTcd after 6-MWT were significantly shorter than those before 6-MWT in CHF patients （ P = 0. 007

and 0. 018）. There was no significant difference in the measurement in the control group. Conclusion: QTd and QTcd are longer in CHF patients than in normal subjects. Moderate exercise may improve the inhomogeneity of ventricular repolarization dispersion in CHF patients.