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.

Abstract
Aim. The aim of this study was to examine the relationship of informational support and anxiety among family members of patients admitted to intensive care units (ICUs) in selected educational and medical centers in Hamadan city, Iran, in 2024.
Background. Families of ICU patients frequently experience high levels of anxiety, which may lead to physical and psychological complications. Research indicates that one of the most significant factors contributing to anxiety among family members is a lack of information and familiarity with the ICU environment.
Method. This was a descriptive-correlational study. A total of 191 family members of ICU patients in selected educational and medical centers in Hamadan were recruited using a convenience sampling method, based on predefined inclusion criteria. Data collection tools included a demographic information questionnaire, the Spielberger State-Trait Anxiety Inventory, and Informational Support questionnaire. Data were analyzed using SPSS version 16, applying both descriptive and inferential statistics.
Findings. The findings indicated that the mean anxiety score of participants was 45.7±6.62, with the majority falling within the moderate anxiety range. The mean score of informational support was 46.18±9.78. Pearson correlation test showed a statistically significant positive relationship between the level of informational support and anxiety (r=0.29, P=0.006). One-way ANOVA revealed a statistically significant association between education level and anxiety among family members (F=4.222, P=0.006). Furthermore, informational support was significantly associated with education level and employment status. No statistically significant associations were found between other demographic variables and either anxiety or informational support.
Conclusion. Anxiety among family members of ICU patients is common and typically of moderate severity. Contributing factors include the stressful environment, lack of awareness about the patient's condition, and educational background. Contrary to expectations, increased informational support from healthcare staff did not reduce anxiety and in some cases appeared to increase it, potentially due to the manner of information delivery and the psychological state of family members. These findings highlight the importance of considering demographic characteristics when designing psychological and informational interventions. Recommended strategies include open visitation, education, family involvement, and the presence of a psychologist.