MLHFQ was developed specifically for heart failure, which makes it an instrument much more suited to the reality of this type of patient. For this reason, this questionnaire may differ in some questions when compared to other generic questionnaires such as the 36-item Short-Form Health Survey (SF-36) which was developed for chronic diseases11,12. In spite of this, in a prior study good consistency was found between the QQVM and the SF-36, although no one datum for physical capacity was investigated12