Abstract
Objective: To evaluate the effects of hyper-oxygenation techniques (manual resuscitation bag, ventilator hyperinflation and O2 therapy mask) on arterial blood gases and hemodynamic status of patients after endotracheal suctioning.
Methodology: This randomized clinical trial was conducted from July to October 2020 at intensive care unit at Ain Shams University Hospital. It included 90 ventilated critically ill patients who were divided into three groups; manual resuscitation bag, ventilator hyperinflation and O2 therapy mask, 30 patients in each group. Clinical data were recorded immediately, 30 seconds and 5 minutes after endotracheal suction after three techniques.
Results: Immediately after suction, O2 therapy mask group had the highest pulse, systolic and diastolic blood pressure, lowest oxygen pressure and saturation with highest CO2 pressure. At 30 seconds after suction, the manual resuscitation bag group had the highest systolic blood pressure, pulse and peak airway pressure. The pH was most stable in ventilator hyperventilation group. At 5 minutes after suction, ventilator hyperinflation group had the highest value of oxygen pressure and saturation with lowest CO2 pressure than manual resuscitation bag and O2 therapy mask groups.
Conclusion: Ventilator hyperinflation before endotracheal suctioning was successful in preventing the dangerous of hypoxemia and hypercapnia, and in keeping the patient hemodynamically stable after suctioning.

Key words: Hyper-oxygenation, arterial blood gases, hemodynamic, endotracheal suctioning.