Bispectral Index Monitoring and Observer Rating Scale Correlate with Dreaming during Propofol Anesthesia for Gastrointestinal Endoscopies

Background and objectives: Dreaming is a commonly reported side effect of propofol anesthesia. Materials and Methods: We investigated the inci-dence and character of dreams in patients undergoing intravenous propofol anesthesia and cor-related it with an observer rating scale of facial expression on the seven-point scale from pain to smile. A total of 124 patients undergoing gastrointestinal endoscopy were recruited in the pro-spective observational study. Bispectral index (BIS), blood pressure (BP), and pulse were moni-tored. Upon emergence from anesthesia, the patient’s facial expression was rated numerically. Thereafter, patients were asked whether they had dreams and to rate their dreams as pleasant or unpleasant. The mean age of participants was 53; body mass index, 26.17; duration of procedure, 20 min; and average propofol dose, 265 mg. Results: Dreaming was reported by 43% of patients. Dreams were pleasant in all but one patient. There was a significant correlation of the observer’s rating of facial expression with dreaming (r = 0.260; p = 0.004). Dreamers had higher scores of observer rating of facial expression (1 (0–2) vs. 0.5 (0–1), p = 0.006). Conclusions: BIS values were lower in the dreamers vs. non-dreamers 2 min after the endoscopy started (48 (43–62) vs. 59 (45–71), p = 0.038). Both BIS and observer ratings correlate with dreaming in patients undergoing gastrointestinal endos-copy. Trial registration number: NCT04235894.

Effective method of monitoring cerebral tissue oxygen saturation in cardiac surgery patients by combined use of tNIRS-1 and bispectral index

To continuously and noninvasively monitor the cerebral tissue oxygen saturation (StO2) and hemoglobin concentration (gasHb) in cardiac surgery patients, a method combining the use of a cerebral tissue oximeter using near infrared time-resolved spectroscopy (tNIRS-1) and the bispectral index (BIS) was developed in this study. Moreover, the correlation between the estimated hemoglobin concentration (estHb), measured via tNIRS-1, and the hemoglobin concentration (gasHb), analyzed using a blood gas analyzer, were compared. The relationship between the BIS and gasHb was also examined. Through the comparison of BIS and StO2 (r1), and estHb and gasHb (r2), the correlation between the two was clarified with maximum r1 and r2 values of 0.617 and 0.946, respectively. The relationship between BIS and gasHb (r3), showed that there was a favorable correlation with a maximum r3 value of 0.969. There was also a continuous correlation between BIS and StO2 in patients undergoing cardiac surgery. In addition, a strong correlation was found between estHb and gasHb, and between BIS and gasHb. It was therefore concluded that the combined use of BIS and tNIRS-1 is useful to evaluate cerebral hypoxia, allowing for quick response to cerebral hypoxia and reduction of hemoglobin concentration during the operation.

Effective Doses of Nalbuphine Combined With Propofol for Painless Gastroscopy in Adults: A Randomized Controlled Trial

Objective: This prospective study evaluated the 50% effective dose (ED50) and 95% effective dose (ED95) of nalbuphine combined with propofol during painless gastroscopy.Methods: Seventy-five patients who underwent painless gastroscopy were randomly divided into five groups (group N0, N0.05, N0.1, N0.15, and N0.2), with doses of 0, 0.05, 0.1, 0.15, or 0.2 mg/kg nalbuphine in each group. Propofol was given to all groups as the sedative. The bispectral index (BIS) value, propofol dose, examination time, and awakening time were recorded. The number of patients with intolerance indexes (coughing, retching, swallowing, or limb movement) was recorded in each group. The ED50/ED95 of nalbuphine combined with propofol for gastroscopy were calculated.Results: Compared with those of groups N0, N0.05, or N0.1, the propofol dose and awakening time were significantly reduced in group N0.15 or N0.2 (p < 0.05). The successful rate of painless gastroscopy in group N0.15 or N0.2 significantly increased compared to that of group N0 or N0.05 (p < 0.05). When combined with propofol, nalbuphine had an ED50 and ED95 for painless gastroscopy of 0.078 mg/kg (95% CI, 0.056–0.098 mg/kg) and 0.162 mg/kg (95% CI, 0.134–0.217 mg/kg), respectively.Conclusion: The ED50/ED95 of nalbuphine combined with propofol are 0.078 and 0.162 mg/kg, respectively, for painless gastroscopy. Nalbuphine at 0.162 mg/kg combined with propofol is effective and safe for painless gastroscopy in adults.

Effect of Bispectral Index-Guided Total Intravenous Anesthesia on Post-Anesthetic Recovery Outcomes in High-Risk Children: A Prospective, Randomized, Controlled Trial

BACKGROUND TIVA is widely used in children, but few studies have attempted to evaluation of the effect of BIS-guided propofol infusion than that on conventional methods on recovery outcomes in children with higher risk factors.OBJECTIVETo evaluate the effect of bispectral index (BIS) guidance during total intravenous anesthesia on post-anesthetic recovery outcomes in children at higher risk during anesthesia. DESIGNA prospective, randomized, controlled trial. SETTING University medical centre.PATIENTSThis study enrolled 472 children (aged 1-14 years) who met the higher-risk scoring criteria and were scheduled for surgery under total intravenous anesthesia. INTERVENTIONThe children were randomly assigned to the BIS group (group B) and standard clinical practice group (group S). The BIS values in group B were maintained at 45–60. The anesthesiologist controlled the depth of anesthesia in group S according to the variation in the clinical signs of the children. MAIN OUTCOME MEASURESBIS values, heart rate (HR), mean arterial pressure (MAP), and pulse oxygen saturation at each time points, as well as the time between drug withdrawal to extubation, duration of stay in the post-anesthesia care unit (PACU), the total amount of propofol used, and postoperative adverse reactions were recorded. RESULTSThere was no significant difference in time from stopping propofol infusion to extubation and duration of PACU between the groups . There was no significant difference in BIS values between the groups at T2, T3, and T8. BIS values at T1, T4, T5, T6, and T7 in group B were lower than those in group S. There was no statistically significant difference in the HR between the groups. MAP in group B was lower than in group S at T5, T6, T7, and T8. The total amount of propofol administered in group B was higher than in group S. CONCLUSIONThe use of BIS-guided total intravenous anesthesia in higher-risk children can maintain the proper depth of anesthesia but does not prolong the time of extubation and the duration of stay in the PACU.TRIAL REGISTRATION Chictr.org.cn identifier: 24/11/2017 , ChiCTR-IOR-17013530