Influence of a Rehabilitation in Valve Replacement on Heart Rate Variability and Oxidative Stress

Study Overview
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Brief Summary
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4 consecutive days with volunteers between the first and fourth postoperative period of cardiac valve replacement. The volunteers are randomized into 2 groups: the Control Group submitted to cardiac rehabilitation protocol of the hospital where it will be conducted the study, which consists of respiratory and metabolic exercises. The second group, called Early Mobilization Group in addition to the aforementioned exercises will be added exercise in cycle ergometer. For the implementation of rehabilitation protocol in the early mobilization group volunteers will be placed in a sitting position in the bed with the backrest raised to 45 °. The exercise in cycle ergometer will be held for 20 minutes on four consecutive days of active mode, the training load shall be such that the voluntary maintained throughout training a level of fatigue, maintaining level of heart rate predicted for age increased by 70% and 1 w / cm2 every minute to keep the parameter within the standards. The evaluation of heart rate variability with the Polar monitor RS800CX brand model before surgery was performed first postoperative day and fifth postoperative day in the control groups and early mobilization.

Detailed Description
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The valve disorders are a special group of heart diseases with long period without clinical manifestations, when there is the appearance of symptoms, the patient is a likely candidate for surgery. In many surgical complications can occur, including the respiratory cause and immobility in bed culminating in the need for intensive care. Early mobilization exercises conducted by physical therapy in critically ill patients is to minimize complications related to immobility in bed from surgery that is performed in exchanges of heart valves. To investigate the influence of a cardiac rehabilitation program on cardiac function (Heart Rate Varibility) and free radicals (oxidative stress) in patients undergoing surgical heart valve replacement. The study is being conducted at the Clinical Hospital Gaspar Viana of Belém, in March 2014 period to March 2016, with the proposing institution the Methodist University of Piracicaba. The study included 60 volunteers aged 18 to 60 year old male with surgery scheduling of heart valve replacement. The volunteers were divided into 2 groups the control group who underwent rehabilitation proposed by the hospital with simple exercises like deep breathing exercises to improve cough, move your arms and rhythmically legs to maintain joint mobility, the second group It was called Early Mobilization Group, where volunteers beyond rehabilitation protocol proposed by the hospital, held exercises in a cycle ergometer, The volunteers were instructed to pedal lying comfortably with moderate intensity for 30 minutes. All groups performed this protocol lasting 4 days. Oxidative stress was analyzed and cardiac function before surgery, after surgery in the first and fifth postoperative. The Oxidative Stress is analyzed by puncturing a drop of blood and to analyze the photographed area coagulum formed. Cardiac function (Heart Rate Variability) will be analyzed using a heart rate monitor brand Polar® RS800CX model being evaluated lying down, then the data is transferred to the computer and analyzed in a program called Kubios HRV. After collecting the data will be analyzed in Biostat 5.2 program. The possible risks to the research subject is the inconvenience of collecting the blood sample, the onset of pain resulting from the mobilization of the rehabilitation protocol. However, the emergence of at least one of the risks mentioned above, the procedure and / or service must be stopped and perform passive stretching or temporary home until everything returns to normal. In addition, there may be a risk of contamination to volunteer for collecting blood, however this risk is minimized when using materials such as sterile needles and blades. The research brings benefit as increased range of motion and muscle strength, decreased pain, functional improvement, providing improvement in quality of life and functional independence and reduced hospital stay.

Official Title
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Influence of Early Mobilization Protocol in Heart Valve Replacement on Heart Rate Variability and Oxidative Stress

Conditions
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Cardiac Valve Disease

Intervention / Treatment
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* Other: physical therapy procedure


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Volunteers underwent cardiac valve replacement surgery Using median sternotomy Aged 30 60 years Pulse saturation greater than 90% BMI ranging between 18.5 and 25 kg / m2 Exclusion Criteria: Less than 30 years or over 60 years of age Other type of heart surgery than valve replacement, as well valve re-replacement Unconscious and level of the Glasgow Coma below scale 15 Cardiac arrhythmias With electrolyte disturbances With pleural diseases such as pneumothorax, empyema or pleural effusion Circulatory failure acute Infections in either system Patients with coagulation disorders Pulse oxygen saturation lower than 90% even with supplementary oxygen therapy - Hemodynamically unstable supply.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Control<br>Participants are submitted to cardiac rehabilitation protocol of the hospital where it will be conducted the study, which consists in respiratory exercises of 3 series Inspirations Maximum Sustained for 10 reps, 3 sets of 20 repetitions metabolic exercises with dorsiflexion and plantar flexion and ankle and wrist extension and fingers of the upper limbs. Assessment of heart rate varibility and oxidative stress carried out before the heart valve replacement surgery , the first day of postoperative and on the fifth postoperative day | Other: physical therapy procedure<br>* physiotherapy exercises conducted in early way for the rehabilitation of patients in the postoperative period of cardiac valve replacement.<br>* Other names: early mobilization;|
| Active Comparator: Early mobilization<br>Participants performed exercise in cycle ergometer of lower Limbs, pedaling for 20 consecutive minutes at a moderate level with Heart Rate Assessment and the Borg scale to evaluate the Voluntary Comfort. Assessment of heart rate varibility and oxidative stress carried out before the heart valve replacement surgery , the first day of oepratório post and on the fifth postoperative day | Other: physical therapy procedure<br>* physiotherapy exercises conducted in early way for the rehabilitation of patients in the postoperative period of cardiac valve replacement.<br>* Other names: early mobilization;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Heart Rate Variability | It will be analyzed the uptake of heart rate variability by means of the heart rate monitor Polar ® brand, model RS800CX where FC signal is received by a strap to the signal receiver, to be placed on the thorax at the level of voluntary xiphoid process. This capture is stored in the Polar monitor and transferred to the software Polar ProTrainer program by means of an emission of infrared signals interface, where they are stored and subsequently exported to TXT format, which subsequently can be analyzed by a math routine in Kubios HRV® program. Volunteers will be asked to remain at rest for a period of 10 min, avoiding talking to the researcher so that the heart rate does not undergo changes. | one hour | 
| Oxidative stress | Morphological evaluation of oxidative stress in the blood plasma is performed by the so called Optical Microscopy Test for In Vitro Analysis Cell or HLB Test. The fingertip of the fourth finger of the previously sanitized hand with alcohol, will collect a drop of blood next to a microscope slide through five light touch of this blade next to the drop . At the end of this period, the morphology of this clot is microscopically observed under a 40-fold increase in optical microscope brand Nikon® model Binocular E200 Standard and its qualitative graduation will be recorded by the camera attached Nikon® mark on a spreadsheet to later analysis. The observation of morphological patterns of the different obtained clots will be held in the first image taken on each of the blades and the evaluation will be conducted through the program called OxyScanner® developed and marketed by Aldea Global Soluciones (AGS). | one hour | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Hospitalization time evaluation | investigate the volunteers of stay in both intervention groups using evaluation of the patients medical records | 1 month | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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valve replacement, physical therapy, early mobilization