This study evaluates the efficacy and safety of a single session of positive expiratory pressure and of breath stacking technique in patients after cardiac surgery. The same patients will receive the two interventions, with an interval of 24 hours, and the acute effect of each will be verifed.
Physiotherapy uses techniques and equipment that reduce postoperative pulmonary complications. The technique called breath stacking consists of an instrumental feature composed of a unidirectional valve coupled to a face mask to promote the accumulation of successive inspiratory volumes. The technique is used to prevent atelectasis and improve gas exchange. Another therapy is called expiratory positive airway pressure (EPAP) that uses positive end expiratory pressure (PEEP) in spontaneously breathing patients, keeping the airway open during expiration. The EPAP system consists of a face mask, a one-way valve and the expiratory resistor, which is responsible for resistance to expiratory flow, which will determine the level of PEEP.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
24
The patients will perform the maneuver through successive inspiratory efforts for 20 s. Subsequently, the expiratory branch will be unobstructed to allow expiration. This maneuver will be repeated 5 times in each series, with intervals of 30 seconds between them. The technique will be performed with the trunk inclined 30º in relation to the horizontal plane, in 3 series, with interval of 2 min completing 15 min of therapy.
Patients will perform exhalation of air through a facial mask containing an extrinsic positive expiratory pressure valve with a defined load of 10 cmH2O for 5 min. During the application of the technique the patients will have a trunk inclined 30º and will be stimulated to breathe normally, without effort or deep and fast breaths.
Federal University of Santa Maria
Santa Maria, Rio Grande do Sul, Brazil
Tidal volume
It will be evaluated preoperatively and also before and after 10 minutes of each intervention, in the postoperative period. This measurement will be obtained through the the division of the minute volume by the respiratory rate.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Forced vital capacity (FVC)
It will be evaluated preoperatively and also before and after 10 minutes of each intervention, in the postoperative period, as recommended by the American Thoracic Society and European Respiratory Society (2006) and based on reproducibility and acceptability criteria, three maneuvers will be performed (variability \<5%) and considered the best curve for the study.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Forced expiratory volume in the first second (FEV1)
It will be evaluated preoperatively and also before and after 10 minutes of each intervention, in the postoperative period, as recommended by the American Thoracic Society and European Respiratory Society (2006) and based on reproducibility and acceptability criteria, three maneuvers will be performed (variability \<5%) and considered the best curve for the study.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Peak expiratory flow (PEF)
It will be evaluated preoperatively and also before and after 10 minutes of each intervention, in the postoperative period, as recommended by the American Thoracic Society and European Respiratory Society (2006) and based on reproducibility and acceptability criteria, three maneuvers will be performed (variability \<5%) and considered the best curve for the study.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Forced expiratory flow between 25 and 75% of the curve of FVC (FEF25-75)
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It will be evaluated preoperatively and also before and after 10 minutes of each intervention, in the postoperative period, as recommended by the American Thoracic Society and European Respiratory Society (2006) and based on reproducibility and acceptability criteria, three maneuvers will be performed (variability \<5%) and considered the best curve for the study.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Minute volume
It will be evaluated preoperatively and also before and after 10 minutes of each intervention. To obtain the Minute Volume (MV), the patient will be instructed to inhale and exhale slowly for one minute and the value of MV and respiratory rate (RR) will be recorded. The respiratory rate was measured by the movements of the rib cage during respiratory cycles performed in one minute. The MV will be obtained by a Wright ® ventilometer (British Oxigen Company, London, England).
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Respiratory rate
They will be assessed at baseline, immediately after and 10 minutes after each intervention. The respiratory rate was measured by the movements of the rib cage during respiratory cycles performed in one minute.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Heart rate
They will be assessed at baseline, immediately after and 10 minutes after each intervention, through multi-parameter monitor.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Peripheral Oxygen Saturation (SpO2)
They will be assessed at baseline, immediately after and 10 minutes after each intervention through the G-Tech® portable pulse oximeter.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Blood pressure
They will be assessed at baseline, immediately after and 10 minutes after each intervention. The blood pressure will be obtained through multi-parameter monitor.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Heart work measurement
They will be assessed at baseline, immediately after and 10 minutes after each intervention through the calculation of the double product (multiplication of systolic blood pressure by heart rate).
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Thoracoabdominal mobility
Will be evaluated by thoracic and abdominal cirtometry
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Painful perception in the surgical incision
Will be assessed at baseline, immediately after and 10 minutes after each intervention through a Visual Analog Scale, a one-dimensional instrument for evaluation of pain intensity, with a range of 1 to 10.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Degree of dyspnea
Will be assessed at baseline, immediately after and 10 minutes after each intervention, through the Modified Borg Scale, a vertical scale quantified from 0 to 10. Zero represents no symptoms and 10 represents maximum symptoms.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention
Signs of respiratory discomfort (dizziness, tachypnea, sweating, use accessory musculature)
They will be assessed at baseline, immediately after and 10 minutes after each intervention, through clinical inspection.
Time frame: 12 to 24 hours after removal of drains and 24 hours after primary intervention