Eligibility Criteria
This study included patients of both sexes, aged 18 years or older and
who underwent to coronary artery bypass grafting with median sternotomy
and cardiopulmonary bypass. Patients with hemodynamic instability before
noninvasive ventilation, who were not cooperative or who had
contraindications for the use of NIV, chronic pulmonary disease, absence
of blood gas analysis in some of the study phases, physical limitations
that compromised the performance of functional tests were excluded
(amputation), difficulty understanding to perform the applied tests,
surgical reintervention, more than 24 hours in invasive mechanical
ventilation and patients who refused to sign the consent form.