Chronic Heart Failure Clinical Trial
Inspiratory muscle dysfunction is a reduction in the ability to generate pressure and force by the inspiratory muscles. This decrease in the strength of these muscles can be attributed to biochemical and histological changes. Some patients with CHF showed a reduction of maximal inspiratory pressure (MIP) and inspiratory muscle endurance, and such factors known to exercise limitation and deterioration in quality of life and worsens the prognosis of these patients. This study aims to evaluate the Regional pulmonary distribution volume and the influence of enclosures system thoracoabdominal in CHF patients with cardiomegaly associated with diaphragmatic weakness during quiet breathing and during exercise for inspiratory muscle and its correlation with functional data. The investigators evaluated a total of 31 individuals divided into two groups: CHF and control. In the control group, twelve volunteers participated with similar age, gender and body mass index in relation to the group of patients with CHF. The control group participants had an ejection fraction of left ventricle (EF)> 50% without cardiac abnormalities of the cameras and MIP over 80% of predicted. To conduct the exercise to the inspiratory muscles (EMI) was used for IMT Threshold ® device (Threshold Inspiratory Muscle Trainer, HealthScan Products Inc., Cedar Grove, New Jersey) is one of the most used for training of inspiratory muscles in patients with several pathologies such as CHF. The exercise time was 3 minutes. During this period, participants were encouraged to only breathe through the mouth and maintain a respiratory rate between 12 and 16ipm. Opto-electronic plethysmography measures the volume changes of thoracoabdominal system by placing 89 markers formed by hemiesferas covered with retro-reflective paper, taking the place of each of these hemiesferas determined by anatomical landmarks on the anterior and posterior regions of the chest and abdomen. According to our study, a lower ventilation on diaphragmatic region would lead to an increased perception of dyspnea during submaximal exercise in this population. Moreover, the observed changes in the pattern of regional distribution of ventilation in CHF patients compared to healthy individuals can serve as a basis for prospective cohort studies using IMT.
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Intervention Model: Parallel Assignment, Masking: Open Label
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