Regional Distribution of Ventilation in Patients With Chronic Heart Failure

NCT ID: NCT01292902

Last Updated: 2011-02-10

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 31 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2010-07-31
• Study Completion Date: 2010-12-31

Brief Summary

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.

Conditions

Chronic Heart Failure

Study Design

• Intervention Model: PARALLEL
• Blinding Strategy: NONE

Study Groups

healthy volunteers

Group Type: ACTIVE_COMPARATOR

inspiratory muscle exercise

Intervention Type: OTHER

Equal to the group with chronic heart failure.

chronic heart failure

Group Type: OTHER

inspiratory muscle exercise

Intervention Type: OTHER

To conduct the exercise to the inspiratory muscles 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 ICC.Threshold ® has been engaged in the patient's mouth by a mouthpiece, with the nose occluded by a nose clip. 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. The exercise would be stopped if HR increased more than 20% and / or SpO2 \< 88%.

Interventions

inspiratory muscle exercise

To conduct the exercise to the inspiratory muscles 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 ICC.Threshold ® has been engaged in the patient's mouth by a mouthpiece, with the nose occluded by a nose clip. 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. The exercise would be stopped if HR increased more than 20% and / or SpO2 \< 88%.

Intervention Type: OTHER

inspiratory muscle exercise

Equal to the group with chronic heart failure.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Diagnosed as CHF associated with cardiomegaly
• Class II and III (NYHA)
• Left ventricular minor 45% (method Teicholtz)
• Inspiratory muscle weakness (PiMáxima <70% predicted)
• Duration of symptoms > 1 year
• Body mass index (BMI) < 35kg/m2
• Non-smokers or former smokers with a smoking history < 10 pack-years

Exclusion Criteria

• Patients with chronic heart failure who had unstable angina, myocardial infarction or heart surgery until three months before the survey
• Orthopedic diseases or respiratory comorbidities such as asthma and COPD

• Minimum Eligible Age: 21 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Universidade Federal de Pernambuco

OTHER

Sponsor Role: lead

Responsible Party

Universidade Federal de Pernambuco

Locations

Universidade Federal de Pernamabuco

Recife, Pernambuco, Brazil

Countries

Brazil

References

Ernst ER, Shub C, Bailey KR, Brown LR, Redfield MM. Radiographic measurements of cardiac size as predictors of outcome in patients with dilated cardiomyopathy. J Card Fail. 2001 Mar;7(1):13-20. doi: 10.1054/jcaf.2001.23244.

Reference Type: RESULT

PMID: 11264545 (View on PubMed)

Other Identifiers

27012011

Identifier Type: -

Identifier Source: org_study_id