Abstract:

Objective To investigate the impact of recent rhythmic interventions on the depth of sedation during anesthesia induction in patients undergoing general anesthesia with remazolam toluene sulfonate. Methods Patients aged 18 ~ 65 years who underwent elective surgery under general anesthesia were selected and divided into a day group （7：00 ~ 19：00） and a night group （19：00 ~ 7：00 the following day） based on the start time of anesthesia induction. Each group comprised 70 patients， further subdivided into five equal dose groups of remazolam toluene sulfonate at 0.11， 0.13， 0.16， 0.18， and 0.22 mg/kg， with 14 patients in each subgroup. The Modified Observer's Assessment of Alertness/Sedation （MOAA/S） score and Bispectral Index （BIS） value were recorded 3 minutes post?administration， and the correlation coefficient between these two parameters was calculated. The induction dose and unit body weight dose of remazolam toluene sulfonate were documented when the MOAA/S score was ≤ 1. Additionally， the induction dose of remazolam for both day and night groups as well as for patients of different genders was recorded. The half effective dose （ED50）， 95% effective dose （ED95）， and 95% confidence interval （CI） for both the day and night groups were also calculated. Results When MOAA/S ≤ 1， the induced dose of remazolam in the night group （12.34 ± 3.51） mg was significantly lower than that in the day group （13.98 ± 4.21） mg. Additionally， the dose per unit body weight of remazolam in the night group （0.20 ± 0.049） mg/kg was also significantly lower than that in the day group （0.22 ± 0.056） mg/kg. Statistically significant differences were observed in the ED50 and ED95 values of remazolam between the day and night groups （P < 0.05）. The correlation coefficient between BIS and MOAA/S was 0.902 （95%CI： 0.876 ~ 0.925） in the day group and 0.905 （95%CI： 0.879 ~ 0.929） in the night group， indicating a strong correlation between MOAA/S and BIS in both groups. However， there was no significant difference in the correlation coefficients between the two groups （P > 0.05）. The correlation coefficients between BIS and MOAA/S were 0.763 （95%CI： 0.726 ~ 0.799） in the daytime group and 0.777 （95%CI： 0.739 ~ 0.808） in the nighttime group. In a separate analysis， the correlation coefficients were 0.768 （95% CI： 0.723 ~ 0.804） for the daytime group and 0.771 （95% CI： 0.723 ~ 0.811） for the nighttime group. A strong correlation was observed between MOAA/S and BIS in both male and female patients during both day and night， with no significant difference in correlation coefficients between groups （P > 0.05）. However， BIS values were significantly lower in the nighttime group compared to the daytime group （P < 0.05）. Additionally， male patients required a higher total induced dose of remazolam than female patients during both day and night， with this difference being statistically significant （P < 0.05）. Furthermore， female patients exhibited a significant decrease in BIS values at night （P < 0.05）. Conclusions Recent studies have shown that circadian rhythm significantly influences anesthesia?induced sedation in patients undergoing general anesthesia with remazolam toluenesulfonate. Specifically， the sedation effect is more pronounced in nighttime procedures， and there is a notable gender difference， with female patients exhibiting better sedation outcomes during nighttime surgeries.

Key words: recent rhythm, remazolam toluene sulfonate, sedative effect, anesthetic induction dose, sex