Abstract
Aim. This study was conducted to evaluate effect of bedside teaching on critical care nurses' performance in airway suctioning
Background. One of the most effective measures in patients undergoing mechanical ventilation is suctioning the trachea to prevent the accumulation of potentially infectious pulmonary secretions and to clear the airway which is carried out by critical care nurses. If suctioning cannot be correctly performed, some complications may occur.
Method. This was a quasi-experimental study in which the study sample consisted of 54 critical care nurses working in Rajaie Cardiovascular Medical and Research Center, Tehran, Iran. The nurses were recruited through convenience sampling based on inclusion criteria. Critical care nurses’ performance in airway suctioning were evaluated before and two weeks after intervention using a checklist. The intervention included bedside teaching of suction procedure.
Findings. Two weeks after intervention, the mean score of performance in airway suctioning increased significantly (P≤0.0001). Hand washing or using hand was recorded only for 16 nurses before intervention and for 35 nurses after intervention. Maintaining catheter sterility during suctioning was considered by 28 nurses before intervention, and by 40 nurses after intervention. Correct procedure documentation and recording secretion characteristics before and after intervention were carried out by 13 and 34 nurses, respectively. While activating suction during bringing the catheter out of endotracheal tube was done by 31 nurses before intervention, after intervention 41 nurses did so.
Conclusion. Bedside teaching of correct airway suctioning for critical care nurses enhance their performance in this procedure.

Abstract
Aim. The aim of this study was to examine the effect of protocol of weaning from mechanical ventilation on the gastrointestinal function in people undergoing CABG.
Background. The most common problems after cardiac surgery in the intensive care unit are change in vital signs, respiratory problems, unsuccessful separation from mechanical ventilation, and gastrointestinal problems. Due to the numerous effects that gastrointestinal problems have on the patient after cardiac surgery and also the economic burden that these complications impose on the patient and the health care system, choosing the best technique to prevent and control these problems is critical for the health care team.
Method. The present study was a randomized clinical trial conducted on 100 people undergoing CABG. They were allocated to control and experimental group based on permuted block randomization. The control group received routine way and experimental group received protocol of weaning. The groups  were compared in terms of nausea and vomiting, the time of beginning oral diet, defecation and bowel sounds before weaning 2, 6, and 12 hours after weaning from mechanical ventilation. Data were analyzed In SPSS version 23 using chi-square, Mann–Whitney U and Fisher tests.
Findings. In experimental group, there was a faster onset of bowel sounds and movements and earlier beginning of oral diet.
Conclusion. Patients who were under the protocol of weaning from mechanical ventilation had better gastrointestinal functional status compared to those who were under routine weaning.

Abstract
Aim. This study aimed to compare the effect of Adaptive Support Ventilation (ASV) and Synchronized Intermittent Mandatory Ventilation-Pressure Support (SIMV-PS) modes on consequence of weaning off patients from mechanical ventilator after coronary artery bypass surgery
Background. The ventilation mode used for respiratory support in patients after coronary artery bypass graft surgery is very important. In addition to avoiding pressure on patient's sternotomy incision, the ventilation mode should also provide the possibility of rapid weaning of patient to avoid complications caused by long-term ventilation.
Method. In a semi-experimental study, 26 patients were ventilated with ASV as the experimental group and 26 patients were ventilated with SIMV-PS mode as the control group after coronary artery bypass graft surgery in Rajaie Cardiovascular Medical and Research Center, Tehran, Iran. Mechanical ventilation time and endotracheal tube removal time, hemodynamic variables, and arterial blood gas analysis were compared between the two groups. Data were analyzed using an independent t-test, repeated measures ANOVA and chi-square.
Findings. Out of 52 patients, 36 (69.2 percent) were male and 16 (30.8 percent) were female. The mean time for the endotracheal tube removal was 89.42±33.83 minutes in the experimental group and 101.53±44.91 minutes in control group, which did not have a statistically significant difference (p=0.843). The mean duration of mechanical ventilation of patients in the experimental group was 483.84±158.153 minutes and in the control group, it was 541.92±257.81 minutes, which were not statistically different (p=0.332).
Conclusion. The use of ASV mode for mechanical ventilation after coronary artery bypass graft did not affect reducing the duration of mechanical ventilation and the time of endotracheal tube removal compared to SIMV-PS mode. Therefore, the use of ASV mode for respiratory support of patients undergoing coronary artery bypass surgery should be considered according to the patient's condition and the nurses' expertise.