Congenital Heart Disease Clinical Trial
Official title:
Improving Functional Capacity in Fontan Patients Through Inspiratory Muscle Training
Verified date | October 2017 |
Source | Boston Children’s Hospital |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
Mechanisms that typically result in increased cardiac output, such as inotropic support,
increased heart rate, and decreased afterload, have a blunted effect in Fontan circulation.
The "thoracic pump" is a contributor to venous return that has been largely unexplored in
patients with Fontan physiology. Inspiratory muscle training can improve the performance of
competitive athletes across a range of sports and can improve quality of life and functional
capacity in heart failure patients, presumably by reducing inspiratory muscle fatigue and
possibly by improving peripheral blood flow during exercise. One could surmise that the
effects of these changes would be particularly important in the Fontan population. The
investigators propose to study the effects of inspiratory muscle training on exercise and
pulmonary function parameters in a cohort of adult Fontan patients.
The investigators hypothesize that a 12-week program of inspiratory muscle training with an
inspiratory impedance threshold device will improve inspiratory muscle strength and
endurance, and that this will translate into improved exercise performance in patients with
Fontan physiology.
Status | Completed |
Enrollment | 12 |
Est. completion date | March 2015 |
Est. primary completion date | March 2015 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years and older |
Eligibility |
Inclusion Criteria: - 18 years of age and older - Fontan physiology - Undergoing cardiopulmonary stress testing - Able to complete a previous cardiopulmonary stress test in the preceding 24 months - Ability to comply with the inspiratory muscle training protocol - Ability to return for repeat stress testing and pulmonary function testing 12 weeks after enrollment - Ability to provide informed consent Exclusion Criteria: - Status post cardiac transplantation - Current pregnancy or plans to become pregnant within the next 3 months (for females of childbearing potential) - Active respiratory infection - Active cigarette smoker - Baseline oxygen saturation <90% at the previous clinic visit or exercise test - Forced expired volume in 1 s and/or vital capacity <60% of predicted at the previous exercise test - Cardiac surgery or catheter-based procedure in the preceding 18 months or planned surgery or catheter-based procedure within the next 3 months |
Country | Name | City | State |
---|---|---|---|
United States | Children's Hospital, Boston | Boston | Massachusetts |
Lead Sponsor | Collaborator |
---|---|
Boston Children’s Hospital |
United States,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Other | Change in Maximum Voluntary Ventilation | 12 weeks | ||
Other | Change in Maximal Inspiratory Pressure | Baseline and after 12 weeks of training | ||
Other | Change in Oxygen Pulse at Peak Exercise | 12 weeks | ||
Other | Change in Peak Work Rate During Exercise | Baseline and after 12 weeks of training | ||
Other | Change in VE/VCO2 Slope (Ratio) During Exercise | Baseline and after 12 weeks of training | ||
Primary | Change in Peak VO2 Between Baseline and Post-inspiratory Muscle Training Measurements. | Baseline and after 12 weeks of training | ||
Secondary | Change in Innocor Measurement (Inert Gas Rebreathing Method) of Cardiac Output at Peak Exercise | 12 weeks | ||
Secondary | Change in SF-36 Health Survey Score (Physical Component Summary) | The 36-Item Short Form (SF-36) Health Survey is a disease-generic survey of an individual's perceived health status and health-related quality of life. There are eight scaled scores, which are the weighted sums of the questions in their section. Each scale is transformed into a 0-100 scale on the assumption that each question carries equal weight. The lower the score the more disability. The higher the score the less disability. These eight scales are then used to calculate (using a proprietary formula) two summary scores: the physical component score (PCS), representing the four physical health scales (physical functioning, role physical, bodily pain, general health), and the mental component score (MCS), representing the four mental health scales (mental health, role emotional, vitality, social functioning). Component scores are norm-based with a mean of 50 (standardized to the US population) and a standard deviation of 10. | 12 weeks |
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