Clinical Comparison of Volume Support Ventilation With Pressure Support Ventilation in Patients Admitted at Intensive Care Unit

Mechanical ventilation (MV) is among the main basics of supportive treatment for respiratory failure in the intensive care unit (ICU). This supportive treatment may cause undesirable complications that led to the introduction of various MV modes. The current study was aimed to assess and compare outcomes of volume support ventilation (VSV) and pressure support ventilation (PSV) regarding spontaneous breath return, weaning and hemodynamic changes among patients admitted at ICU following surgical procedures. This single-blinded randomized-clinical-trial (RCT) was conducted on 100 patients admitted at ICU in 2018-2019. Patients were randomly divided into two fifty-member groups treated with PSV and VSV modes. Oxygen saturation, systolic (SBP) and diastolic blood pressure (DBP), mean arterial pressure (MAP), arterial blood gas (ABG), extubation and MV time and sedation based on RAMSY criteria were recorded and compared. Mean age (P=0.79) and gender distribution (P=0.57) were not statistically different in the two groups. Time has no effect on patients' hemodynamic (P>0.05) while hemodynamic stability was superior in VSV (P<0.05). ABG showed no statistical difference between groups (P>0.05) except for arterial oxygen pressure that was higher in the VSV group (P<0.001). The duration of MV, extubation time and duration of ICU admission was significantly lower in the VSV group. Furthermore, sedation based on RAMSY criteria showed the superiority of VSV (P<0.05). Use of VSV mode was accompanied with superior outcomes in four entities including earlier and easier weaning, shorter duration of ICU admission, least hemodynamic instabilities and least sedation requirement in comparison to PSV mode.