Porpose: Respiratory muscle function can be affected in heart failure (HF) and this can reduce the blood flow to the peripheral muscles, causing widespread muscle atrophy may lead to fatigue, and decreases in activities of daily living. Hence the need to identify the correlation that respiratory muscle strength has with the self-reported fatigue in patients with HF for interventions to be proposed in a targeted, systematic and reasoned.
Methods: We conducted a retrospective observational descriptive study.with 12 files of patients that were analyzed in a Universitary Heart Failure Clinic. The Dutch Fatigue Scale (DUFS) and the Dutch Exertion Fatigue Scale (DEFS) questionnaires were applied. The respiratory muscle strength was tested by a analogical type manometer (Ger-Air, Famabras). This study was approved by the Research Ethics Committee of the University.
Results: The respiratory muscle strength Pimáx was - 56 ± 20 cm H2O (Predicted - 81 ± 4 cm H2O), and the Pemáx 41 ± 19 cm H2O (Predicted 80 ± 7 cm H2O). In relation to self reported fatigue got the following average DUFS 25 ± 8 and DEFS 21 ± 12. There was an inverse between Pemáx with DUFS (r = -0.70; p = 0.830) and an inverse, strong and significant correlation between intensity MIP with DUFS (r = -0.70; p = 0.016) and an inverse correlation, significant and moderate Pimáx with DEFS (r = -0.628; p = 0.029).
Conclusion: The results of this study showed that the lower respiratory muscle strength, both Pimáx as Pemáx, the greater the degree of self-reported fatigue in the questionnaire Dutch fatigue Scale.