Regional Distribution of Ventilation in Patients With Chronic Heart Failure

This study has been completed.
Sponsor:
Information provided by:
Universidade Federal de Pernambuco
ClinicalTrials.gov Identifier:
NCT01292902
First received: February 9, 2011
Last updated: NA
Last verified: January 2011
History: No changes posted
  Purpose

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.


Condition Intervention
Chronic Heart Failure
Other: inspiratory muscle exercise

Study Type: Interventional
Study Design: Intervention Model: Parallel Assignment
Masking: Open Label

Resource links provided by NLM:


Further study details as provided by Universidade Federal de Pernambuco:

Primary Outcome Measures:
  • Opto-electronic plethysmography [ Time Frame: 1 year ] [ Designated as safety issue: Yes ]
    The POE (BTS Bioengineering, Italy) measures the volume changes of thoracoabdominal system through placement of 89 markers formed by hemiesferas covered with retro-reflective paper, taking the place of each of these hemiesferas determined by anatomical landmarks in anterior and posterior thorax and abdomen.


Secondary Outcome Measures:
  • Assessment of Functional Capacity [ Time Frame: 1 year ] [ Designated as safety issue: Yes ]
    To assess the functional capacity test was used for 6-minute walk (6MWT) according to the protocol established by the American Thoracic Society (ATS). Before the test parameters were assessed resting blood pressure (BP), Heart Rate (HR), Oxygen Saturation (SpO2 - pulse oximetry portable Onix 9500), Respiratory Frequency (RF) and dyspnea scale (scale Borg).


Enrollment: 31
Study Start Date: July 2010
Study Completion Date: December 2010
Primary Completion Date: December 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: healthy volunteers Other: inspiratory muscle exercise
Equal to the group with chronic heart failure.
chronic heart failure Other: 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%.

  Eligibility

Ages Eligible for Study:   21 Years to 65 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
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
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01292902

Locations
Brazil
Universidade Federal de Pernamabuco
Recife, Pernambuco, Brazil
Sponsors and Collaborators
Universidade Federal de Pernambuco
  More Information

Additional Information:
Publications:
Responsible Party: Armèle de Fátima Dornelas de Andrade, Universidade Federal de Pernambuco
ClinicalTrials.gov Identifier: NCT01292902     History of Changes
Other Study ID Numbers: 27012011
Study First Received: February 9, 2011
Last Updated: February 9, 2011
Health Authority: Brazil: National Committee of Ethics in Research

Additional relevant MeSH terms:
Heart Failure
Cardiovascular Diseases
Heart Diseases

ClinicalTrials.gov processed this record on October 21, 2014