Value of bispectral index monitor in differentiating between moderate and deep Ramsay Sedation Scores in children

Correlation of Comfort Score and Narcotrend Index during Procedural Sedation with Midazolam and Propofol in Children

Background/Objectives: Precise assessment of hypnotic depth in children during procedural sedation with preserved spontaneous breathing is challenging. The Narcotrendindex (NI) offers uninterrupted information by continuous electrocortical monitoring without the need to apply a stimulus with the risk of assessment-induced arousal. This study aimed to explore the correlation between NI and the Comfort Scale (CS) during procedural sedation with midazolam and propofol and to identify an NI target range for deep sedation. Methods: A prospective observational study was conducted on 176 children (6 months to 17.9 years) undergoing procedural sedation with midazolam premedication and continuous propofol infusion. Statistical analyses included Pearson correlation of NI and CS values, logistic regression, and receiver operating curves. Results: Median NI values varied with CS and age. The correlation coefficient between CS and NI was 0.50 and slightly higher in procedure-specific subgroup analyses. The optimal NI cut-off for deep sedation was between 50 and 60 depending on the analyzed subgroup and displayed high positive predictive values for sufficient sedation throughout. Conclusion: Our study found a moderate correlation between NI and CS, demonstrating reliable identification of adequately sedated patients.

Korean clinical practice guidelines for diagnostic and procedural sedation

Safe and effective sedation depends on various factors, such as the choice of sedatives, sedation techniques used, experience of the sedation provider, degree of sedation-related education and training, equipment and healthcare worker availability, the patient's underlying diseases, and the procedure being performed. The purpose of these evidence-based multidisciplinary clinical practice guidelines is to ensure the safety and efficacy of sedation, thereby contributing to patient safety and ultimately improving public health. These clinical practice guidelines comprise 15 key questions covering various topics related to the following: the sedation providers; medications and equipment available; appropriate patient selection; anesthesiologist referrals for high-risk patients; pre-sedation fasting; comparison of representative drugs used in adult and pediatric patients; respiratory system, cardiovascular system, and sedation depth monitoring during sedation; management of respiratory complications during pediatric sedation; and discharge criteria. The recommendations in these clinical practice guidelines were systematically developed to assist providers and patients in sedation-related decision making for diagnostic and therapeutic examinations or procedures. Depending on the characteristics of primary, secondary, and tertiary care institutions as well as the clinical needs and limitations, sedation providers at each medical institution may choose to apply the recommendations as they are, modify them appropriately, or reject them completely.

Cardiorespiratory Response to Sedative Premedication in Preschool Children: A Randomized Controlled Trial Comparing Midazolam, Clonidine, and Dexmedetomidine

PURPOSE

Sedative premedication in children may negatively impact their cardiorespiratory status during the perioperative course, and no clear consensus exists on the optimal premedication treatment for pediatric patients. The objective was to compare the perioperative cardiorespiratory responses to sedation using three different sedative premedication regimens in preschool children scheduled for surgery with total intravenous anesthesia.

DESIGN

A single-center randomized controlled trial.

METHODS

This is a planned secondary analysis of a study conducted at a 200-bed tertiary referral hospital. Ninety children participated in the study. They were aged 2-6 years and scheduled for ear, nose, and throat surgery with propofol/remifentanil anesthesia. Participants were randomly assigned to receive oral midazolam 0.5 mg/kg^-1 (MID), oral clonidine 4 mcg/kg^-1 (CLO), or intranasal dexmedetomidine 2 mcg/kg^-1 (DEX). The main outcome measures were the sedation level, based on the Ramsay Sedation Scale (RSS), and cardiorespiratory status, monitored during the perioperative period.

FINDINGS

The final cohort had 83 children (MID, n=27; CLO, n=26; DEX, n=30), with similar intergroup patient characteristics. RSS scores were lower in the MID group than in the CLO and DEX groups before induction and within 30 min postsurgery (P<0.001 and P=0.006, respectively). A negative correlation existed between the RSS and heart rate (HR) (r=-0.570, P<0.001). Before anesthesia induction, the respiratory rate was lowest in the DEX group (MID 21.5±1.7 min^-1, CLO 20.6±2.6 min^-1, DEX 20.2±1.7 min^-1; P=0.042). The HR was lower in the CLO and DEX groups than in the MID group (MID, 102.8±10.0 min^-1; CLO, 87.4±9.6 min^-1; DEX, 87.6±7.9 min^-1; P<0.001). The HR was lower immediately after induction (P=0.009) and intraoperatively (P=0.025) in the CLO and DEX groups than in the MID group.

CONCLUSIONS

When used as premedication before propofol/remifentanil anesthesia, clonidine and dexmedetomidine provided deeper preoperative sedation compared to midazolam. From a clinical perspective, all three study drugs provided essentially stable cardiovascular and respiratory conditions during the entire perioperative period.

Transition in eye gaze as a predictor of emergence from general anesthesia in children and adults: a prospective observational study

BACKGROUND

It is useful to monitor eye movements during general anesthesia, but few studies have examined neurological finding of the eyes during emergence from general anesthesia maintained with short-acting opioids and volatile anesthetics.

METHODS

Thirty children aged 1-6 years and 30 adults aged 20-79 years were enrolled. Patients received general anesthesia maintained with sevoflurane and remifentanil. The timing of three physical-behavioral responses-eye-gaze transition (the cycle from conjugate to disconjugate and back to conjugate), resumption of somatic movement (limbs or body), and resumption of respiration-were recorded until spontaneous awakening. The primary outcome measure was the timing of the physical-behavioral responses. Secondary outcome measures were the incidence of eye-gaze transition, and the bispectral index, concentration of end-tidal sevoflurane, and heart rate at the timing of eye-gaze transition.

RESULTS

Eye-gaze transition was evident in 29 children (96.7%; 95% confidence interval, 82.8-99.9). After the end of surgery, eye-gaze transition was observed significantly earlier than resumption of somatic movement or respiration (472 [standard deviation 219] s, 723 [235] s, and 754 [232] s, respectively; p < 0.001). In adults, 3 cases (10%; 95% CI, 0.2-26.5) showed eye-gaze transition during emergence from anesthesia. The incidence of eye-gaze transition was significantly lower in adults than in children (p < 0.001).

CONCLUSION

In children, eye-gaze transition was observed significantly earlier than other physical-behavioral responses during emergence from general anesthesia and seemed to reflect emergence from anesthesia. In contrast, observation of eye gaze was not a useful indicator of emergence from anesthesia in adults.

A retrospective comparative study of local anesthesia only and local anesthesia with sedation for percutaneous endoscopic lumbar discectomy

It is still an unsolved problem to achieve both immediate intraoperative feedback and satisfactory surgical experience in percutaneous endoscopic lumbar discectomy under local anesthesia for lumbar disk herniation (LDH) patients. Herein, we compared the analgesic and sedative effects of local anesthesia alone and local anesthesia with conscious sedation in LDH patients during percutaneous endoscopic lumbar discectomy. Ninety-two LDH patients were enrolled and divided into the following groups: control group (Con Group), dexmedetomidine group (Dex Group), oxycodone group (Oxy Group), and dexmedetomidine + oxycodone group (Dex + Oxy Group). Various signs, including mean arterial pressure (MAP), heart rate (HR), pulse oximeter oxygen saturation (SpO₂) and Ramsay score, were compared before anesthesia (T1), working cannula establishment (T2), nucleus pulposus removal (T3), and immediately postoperation (T4). Clinical outcomes, including VAS score, operation time, hospitalization period, Macnab criteria, and SF-36 score, were also evaluated. The Dex + Oxy Group showed the most stable MAP and HR at T2 and T3 in all groups. The clinical outcomes, such as VAS, hospitalization period, Macnab criteria, and SF-36 score, have no significant differences among groups (p > 0.05). Local anesthesia combined with conscious sedation is a safe and effective method to improve the surgical experience and achieve satisfying clinical outcomes for LDH patients during percutaneous endoscopic lumbar discectomy.

Preoperative anxiety in preschool children: A randomized clinical trial comparing midazolam, clonidine, and dexmedetomidine

INTRODUCTION

Anxiety in pediatric patients may challenge perioperative anesthesiology management and worsen postoperative outcomes. Sedative drugs aimed to reducing anxiety are available with different pharmacologic profiles, and there is no consensus on their effect or the best option for preschool children. In this study, we aimed to compare the effect of three different premedications on anxiety before anesthesia induction in preschool children aged 2-6 years scheduled for elective surgery. The secondary outcomes comprised distress during peripheral catheter (PVC) insertion, compliance at anesthesia induction, and level of sedation.

PATIENTS AND METHODS

In this double-blinded randomized clinical trial, we enrolled 90 participants aged 2-6 years, who were scheduled for elective ear-, nose-and-throat surgery. The participants were randomly assigned to three groups: those who were administered 0.5 mg/kg oral midazolam, 4 µg/kg oral clonidine, or 2 µg/kg intranasal dexmedetomidine. Anxiety, distress during PVC insertion, compliance with mask during preoxygenation, and sedation were measured using the modified Yale Preoperative Anxiety Scale, Behavioral Distress Scale, Induction Compliance Checklist, and Ramsay Sedation Scale, respectively.

RESULTS

Six children who refused premedication were excluded, leaving 84 enrolled patients. At baseline, all groups had similar levels of preoperative anxiety and distress. During anesthesia preparation, anxiety was increased in the children who received clonidine and dexmedetomidine; however, it remained unaltered in the midazolam group. There were no differences in distress during PVC insertion or compliance at induction between the groups. The children in the clonidine and dexmedetomidine groups developed higher levels of sedation than those in the midazolam group.

CONCLUSIONS

In preschool children, midazolam resulted in a more effective anxiolysis and less sedation compared to clonidine and dexmedetomidine.

Determination of the ED95 of a single bolus dose of dexmedetomidine for adequate sedation in obese or nonobese children and adolescents

BACKGROUND

With the increasing prevalence of children who are overweight and with obesity, anaesthesiologists must determine the optimal dosing of medications given the altered pharmacokinetics and pharmacodynamics in this population. We therefore determined the single dose of dexmedetomidine that provided sufficient sedation in 95% (ED₉₅) of children with and without obesity as measured by a minimum Ramsay sedation score (RSS) of 4.

METHODS

Forty children with obesity (BMI >95th percentile for age and gender) and 40 children with normal weight (BMI 25th-84th percentile), aged 3-17 yr, ASA physical status 1-2, undergoing elective surgery, were recruited. The biased coin design was used to determine the target dose. Positive responses were defined as achievement of adequate sedation (RSS ≥4). The initial dose for both groups was dexmedetomidine 0.3 μg kg^-1 i.v. infusion for 10 min. An increment or decrement of 0.1 μg kg^-1 was used depending on the responses. Isotonic regression and bootstrapping methods were used to determine the ED₉₅ and 95% confidence intervals (CIs), respectively.

RESULTS

The ED₉₅ of dexmedetomidine for adequate sedation in children with obesity was 0.75 μg kg^-1 with 95% CI of 0.638-0.780 μg kg^-1, overlapping the CI of the ED₉₅ estimate of 0.74 μg kg^-1 (95% CI: 0.598-0.779 μg kg^-1) for their normal-weight peers.

CONCLUSIONS

The ED₉₅ values of dexmedetomidine administered over 10 min were 0.75 and 0.74 μg kg^-1 in paediatric subjects with and without obesity, respectively, based on total body weight.

CLINICAL TRIAL REGISTRATION

ChiCTR1800014266.

[Validity and reliability of the Niño Jesús Hospital procedural sedation-analgesia scale of the under deep sedation-analgesia]

INTRODUCTION

The procedural sedation scale of the Niño Jesús Hospital (Madrid) (SSPNJH) has not been validated.

PATIENTS AND METHODS

A prospective analytical study was conducted in 2 hospitals on patients ≥ 6 months undergoing invasive procedures using sedation-analgesia with propofol or midazolam and fentanyl. All were monitored using the bispectral index (BIS). Videos were made of each procedure, which were then edited and randomised. A total of 150 videos were rated by four observers using the SSPNJH, the sedation scale of the University of Michigan (UMSS), and the Ramsay Scale (SR). These observers were blinded to the BIS, and at the time of drug administration. To assess test-retest reliability, 50 of the initial 150 randomly selected videos were re-assessed.

RESULTS

The study included a total of 65 patients. The within-observer agreement was high (ρ = 0.793). The SSPNJH gave a good interobserver reliability when compared with the UMSS (ICC = 0.88) and the SR (ICC = 0.86), and there was none with the BIS. Internal consistency was moderate (α = 0.68). Construct validity was demonstrated by changes in scores after administering sedatives (p < 0.0001). The SSPNJH had a very low correlation with the BIS (r = -0.166), and a moderate correlation with the UMSS (r = 0.497) and the SR (r = 0.405). As regards the applicability, this scale has been used in two hospitals in five different areas by four professionals of different categories.

CONCLUSIONS

The SSPNJH is valid, reliable and applicable for sedation monitoring in invasive procedures under deep sedation-analgesia in paediatric patients. The SSPNJH has worse properties than the UMSS and the SR.

Comparison of Intranasal Dexmedetomidine and Oral Pentobarbital Sedation for Transthoracic Echocardiography in Infants and Toddlers: A Prospective, Randomized, Double-Blind Trial

BACKGROUND

Acquisition of transthoracic echocardiographic (TTEcho) images in children often requires sedation. The optimal sedative for TTEcho has not been determined. Children with congenital heart disease are repeatedly exposed to sedatives and anesthetics that may affect brain development. Dexmedetomidine, which in animals alters brain structure to a lesser degree, may offer advantages in this vulnerable population.

METHODS

A prospective, randomized, double-blind trial enrolled 280 children 3-24 months of age undergoing outpatient TTEcho, comparing 2.5 µg·kg intranasal dexmedetomidine to 5 mg·kg oral pentobarbital. Rescue sedation, for both groups, was intranasal dexmedetomidine 1 µg·kg. The primary outcome was adequate sedation within 30 minutes without rescue sedation, assessed by blinded personnel. Secondary outcomes included number of sonographer pauses, image quality in relation to motion artifacts, and parental satisfaction.

RESULTS

Success rates with a single dose were not different between sedation techniques; 85% in the pentobarbital group and 84% in the dexmedetomidine group (P = .8697). Median onset of adequate sedation was marginally faster with pentobarbital (16.5 [interquartile range, 13-21] vs 18 [16-23] minutes for dexmedetomidine [P = .0095]). Time from drug administration to discharge was not different (P = .8238) at 70.5 (64-83) minutes with pentobarbital and 70 (63-82) minutes with dexmedetomidine. Ninety-five percent of sedation failures with pentobarbital and 100% of dexmedetomidine failures had successful rescue sedation with intranasal dexmedetomidine.

CONCLUSIONS

Intranasal dexmedetomidine was comparable to oral pentobarbital sedation for TTEcho sedation in infants and did not increase the risk of clinically important adverse events. Intranasal dexmedetomidine appears to be an effective "rescue" sedative for both failed pentobarbital and dexmedetomidine sedation. Dexmedetomidine could be a safer option for repeated sedation in children, but further studies are needed to assess long-term consequence of repeated sedation in this high-risk population.

Correlation between bispectral index, end-tidal anaesthetic gas concentration and difference in inspired-end-tidal oxygen concentration as measures of anaesthetic depth in paediatric patients posted for short surgical procedures

Background and Aims:

Measurement of end-tidal anaesthetic gas concentrations (ETAG) is currently a pragmatic indicator for monitoring anaesthetic depth. We aimed to assess the performance of ETAG for sevoflurane (ETAG-sevo) with bispectral index (BIS) and difference between inspired and end-tidal oxygen concentration (Fi−Et)O₂% in measuring anaesthetic depth in toddlers and preschool children. Primary outcome was to correlate BIS with ETAG-sevo. Secondary outcome was to correlate (Fi−Et)O₂% with ETAG-sevo and to derive cut-off value of (Fi−Et)O₂%which corresponds with light planes of anaesthesia [minimum alveolar concentration (MAC <0.6)].

Methods:

Thirty patients between 1 and 5 years of age undergoing short procedures were included. ETAG, MAC, BIS and (Fi−Et)O₂% were measured at intubation, maintenance phase, last 15 min of surgery, end of surgery, extubation, recovery. Pearson's correlation coefficient was used to measure correlation. Receiver operating characteristic (ROC) curves were used to derive cut-off value of (Fi−Et)O₂% which corresponded with MAC <0.6.

Results:

BIS correlated poorly with ETAG at all time intervals. Significant correlation was seen between (Fi−Et)O₂% and ETAG at intubation (P = 0.042), last 15 min of surgery (P = 0.019) and end of surgery (P = 0.001). Cut-off value >7 was obtained for (Fi−Et)O₂% corresponding to MAC <0.6 at extubation with area under ROC curve0.955 (95% confidence interval 0.811–0.997), with sensitivity 0.8571 and specificity 1.00.

Conclusion:

BIS was an unreliable measure of anaesthetic depth. (Fi−Et)O₂% values >7 corresponded with light planes of anaesthesia.

Correlation of MDR1 gene polymorphism with propofol combined with remifentanil anesthesia in pediatric tonsillectomy

The motive of this study was to investigate the interaction between polymorphisms in the MDR1 gene and anesthetic effects following pediatric tonsillectomy. In total, 240 children undergoing tonsillectomy with preoperative propofol-remifentanil anesthesia were selected. Genomic DNA was extracted from the peripheral blood of children after operation, and the MDR1 gene polymorphisms of 2677 G>T/A, 1236 C>T and 3435 C>T were detected by direct sequencing. We tested mean arterial pressure, diastolic blood pressure, systolic blood pressure, and heart rate at several time-points: T0 (5 mins after the repose), T1 (0 min after tracheal intubation), T2 (5 mins after the tracheal intubation), T3 (0 min after the tonsillectomy), T4 (0 min after removal of the mouth-gag) and T5 (5 min after the extubation). The visual analog scale, the face, legs, activity, cry, and consolability pain assessment, and the Ramsay sedation score were recorded after the patients regained consciousness. Adverse reactions were also recorded. The time of induction, respiration recovery, eye-opening, and extubation of children with the CC genotype were found to be shorter compared to the CT + TT genotype of MDR1 1236C > T (all P <.05). The mean arterial pressure, diastolic blood pressure, systolic blood pressure, and heart rate were significantly reduced at T5 in children with the CC genotype (all P <.05). The visual analog scale at 1, 2, 4, and 8 hours post-operation, and the Ramsay sedation score at 5, 10, and 30 min after the extubation were decreased, while the face, legs, activity, cry, and consolability pain assessment score increased (all P <0.05). There was no statistically significant difference in the adverse reaction of MDR1 mutations (P> 0.05). It could be concluded that anesthetic effect following pediatric tonsillectomy in patients with the MDR1 1236C > T CC genotype was stronger than in those carrying the CT + TT genotype.

Comparison of oral midazolam with intranasal dexmedetomidine premedication for children undergoing CT imaging: a randomized, double-blind, and controlled study

BACKGROUND

Children undergoing computerized tomography (CT) frequently require sedation to allay their anxiety, and prevent motion artifacts and stress of intravenous (IV) cannulation.

AIMS

The aim of this trial was to compare the effectiveness of oral midazolam and intranasal dexmedetomidine as sole premedicants in children for carrying out both IV cannulation as well as CT scanning, without the need for additional IV sedatives.

METHODS

Fifty-nine children, aged 1-6 years, scheduled to undergo CT imaging under sedation were randomized to receive either 0.5 mg·kg^-1 oral midazolam (group M) or 2.5 mcg·kg^-1 intranasal dexmedetomidine (group D). After 20-30 min, intravenous cannulation was performed and response to its placement was graded using the Groningen Distress Rating Scale (GDRS). After cannulation, children were transferred on the CT table, and assessed using the Ramsay sedation score (RSS). CT imaging was performed without any further sedative if the RSS was ≥4. If there was movement or decrease in sedation depth (RSS ≤ 3), ketamine 1 mg·kg^-1 IV was given as an initial dose, followed by subsequent doses of 0.5 mg·kg^-1 IV if required.

RESULTS

A Significantly higher proportion of children in group D (67%) achieved RSS ≥ 4 as compared to group M (24%) (P-0.002). The risk ratio (95% CI) was 2.76 (1.38-5.52). Significantly lower GDRS scores were noted in group D (1(1-2)) as compared to group M (2(1-2)) at the time of venipuncture (P = 0.04).

CONCLUSION

In the doses and time intervals used in our study, intranasal dexmedetomidine (2.5 μg·kg^-1 ) was found to be superior to oral midazolam (0.5 mg·kg^-1 ) for producing satisfactory sedation for CT imaging.

Efficacy of intravenous midazolam versus clonidine as premedicants on bispectral index guided propofol induction of anesthesia in laparoscopic cholecystectomy: A randomized control trial

BACKGROUND

Midazolam and clonidine are preferred premedicants whose effects are not restricted to the preoperative period. In addition, these premedicants significantly modulate not only the intraoperative requirements of the anesthetic agents, but also the postoperative outcome. We aim to compare the efficacy of both the agents in view of premedication, induction characteristics, hemodynamic changes and postoperative complications utilizing bispectral index (BIS) using propofol anesthesia.

MATERIALS AND METHODS

The type of this study was randomized control trial conducted on patients undergoing laparoscopic cholecystectomy under general anesthesia with endotracheal intubation. Study included 105 patients of either sex aged 20-60 years. The patients were randomly allocated into three groups: Intravenous midazolam (Group 1), clonidine (Group 2), and normal saline (Group 3) (control). The initial value of BIS and Ramsay Sedation Score, dose of propofol required for induction were noted in each group and monitored for pulse rate, electrocardiograph, noninvasive blood pressure, and BIS.

RESULTS

The requirement of propofol ranged from 40 to 150 mg. Mean requirement was maximum in Group 3 (109.43 ± 20.14 mg) and it was minimum in Group 1 (78.57 ± 22.15 mg). A significant reduction in consumption of propofol with the use of midazolam (P < 0.001) and clonidine (P < 0.001) was observed. Both premedicants partially attenuates laryngoscoy and intubation response along with reduction in the incidence of postoperative complications.

CONCLUSION

Both clonidine and midazolam contributed equally in lowering propofol consumption. Reduction in the induction dosage of propofol and hemodynamic variations were also observed to be similar with the use of midazolam or clonidine as premedicants. Both provide a beneficial effect in relation to recovery and less postoperative complications. However clonidine premedication was found to be more effective in preventing post operative shivering and can be recommended in routine practice.

Sedation monitoring during open muscle biopsy in children by Comfort Score and Bispectral Index - a prospective analysis

BACKGROUND

Open muscle biopsies in children are generally performed under general anesthesia. Alternatively, deep sedation and analgesia may be required.

OBJECTIVES

The aim of our study was to compare the Bispectral Index (BIS) and Comfort Score (CS) with respect to their clinical significance for sedation/analgesia in children undergoing open muscle biopsy.

METHODS

Thirty pediatric patients subjected to open muscle biopsy for diagnosis of their underlying disease were prospectively enrolled. Sedation/analgesia was performed in all patients using remifentanil and propofol. The patients were simultaneously monitored using the CS and BIS.

RESULTS

All sedations and muscle biopsies were performed uneventfully. The CS and BIS were significantly correlated (R = 0.589; P < 0.01). Receiver operating characteristic (ROC) analysis revealed an area under the curve (AUC) of 0.918 with a maximum cut-off point of BIS 70.5 (sensitivity 0.9; specificity 0.785) for adequate sedation. Sensitivity of 100% was achieved at BIS 60. Accordingly, all patients with BIS ≤60 had CS within the target range of 10-14. The BIS showed substantial intra- and interindividual variability (30 points and 58 points, respectively) during sedation, whereas CS varied only within close ranges during sedation. In 25 patients, sedatives were reduced according to low BIS values (<60). No unintended anesthesia awareness was noted during the study period.

CONCLUSION

Bispectral Index provides an additional helpful tool to guide sedation/analgesia in minor surgical procedures in children. BIS values ≤60 correlated with sufficient depth of sedation and prevented unintended awareness. Additionally, BIS measurement allowed for distinct regulation of depth of sedation without prolonged sedation/analgesia due to unintended overdose.

High dose dexmedetomidine: effective as a sole agent sedation for children undergoing MRI

Objective. To determine the efficacy and safety of high dose dexmedetomidine as a sole sedative agent for MRI. We report our institution's experience. Design. A retrospective institutional review of dexmedetomidine usage for pediatric MRI over 5.5 years. Protocol included a dexmedetomidine bolus of 2 μg/kg intravenously over ten minutes followed by 1 μg/kg/hr infusion. 544 patients received high dose dexmedetomidine for MRI. A second bolus was used in 103 (18.9%) patients. 117 (21.5%) required additional medications. Efficacy, side effects, and use of additional medicines to complete the MRI were reviewed. Data was analyzed using Student's t-test, Fisher's exact test, and Analysis of Variance (ANOVA). Main Results. Dexmedetomidine infusion was associated with bradycardia (3.9%) and hypotension (18.4%). None of the patients required any intervention. Vital signs were not significantly different among the subgroup of patients receiving one or two boluses of dexmedetomidine or additional medications. Procedure time was significantly shorter in the group receiving only one dexmedetomidine bolus and increased with second bolus or additional medications (P < 0.0001). Discharge time was longer for children experiencing bradycardia (P = 0.0012). Conclusion. High dose Dexmedetomidine was effective in 78.5% of cases; 21.5% of patients required additional medications. Side effects occurred in approximately 25% of cases, resolving spontaneously.

Nurse perception of Bispectral Index monitoring as an adjunct to sedation scale assessment in the critically ill paediatric patient

BACKGROUND

Reliability of clinical scales and haemodynamic variables for assessing sedation depth in critically children is limited, particularly for those receiving neuromuscular blocking agents (NMBAs).

OBJECTIVE

To introduce and integrate the use of Bispectral Index (BIS) monitoring as adjunct to sedation scale assessment in intubated mechanically ventilated Paediatric Intensive Care Unit (PICU) patients.

METHODS

Quality improvement intervention including: BIS education for all PICU nurses; 8-week implementation of BIS monitoring guided by Paediatric BIS Sedation Protocol; evaluation by convenience sample of nurses (n=17).

MEASUREMENTS

15-Item survey assessing perceptions of BIS attributes was given to nurses after first 4 BIS encounters; nurse comments and project coordinator observations were recorded.

FINDINGS

Survey data (intermediate reliability and nurse attitude ratings and low ratings on other attributes; little change over time) revealed nurses' reservations about the usefulness of BIS as an adjunct to sedation scales, but qualitative data indicated that they valued BIS for assessing sedation depth in children receiving NMBAs.

CONCLUSIONS

Post-intervention, BIS monitoring was adopted in PICU for children receiving NMBAs. One year later, this practice is sustained, and the percentage of BIS-monitored patients has increased. Guidelines addressing the use of BIS in patients not receiving paralytics are needed.

Dexmedetomidine sedation: uses in pediatric procedural sedation outside the operating room

As the field of pediatric procedural sedation continues to expand, so does the exploration of medications that have a role in such invasive and noninvasive procedures. One such medication that has emerged during the last decade is dexmedetomidine, a drug approved for use in the adult intensive care setting. Its role in pediatrics has varied in its use from sedation in ventilated children in the intensive care unit to treatment for emergence reactions from general anesthesia and in sedation needed for radiographic imaging studies, electroencephalography, and invasive procedures. This review article presents the pediatric studies that have been published thus far regarding dexmedetomidate in the nonventilated, spontaneously breathing patient and identifies those patients where the use of this agent may not be indicated.

Sedation and anesthesia for CT: emerging issues for providing high-quality care

During the past decades, the use of CT to diagnose conditions and monitor treatment in the pediatric setting has increased. Infants and children often require procedural sedation to maintain a motionless state to ensure high-quality imaging. Various medication regimens have been recommended to achieve satisfactory sedation for this painless procedure. While the incidence of adverse events remains low, procedural sedation carries the risk of serious morbidity and mortality. The use of evidence-based, structured approaches to procedural sedation should be used to reduce variation in clinical practice and improve outcomes.

Extended infusion of dexmedetomidine to an infant at sixty times the intended rate

Dexmedetomidine is an α2 adrenergic agonist which has recently been approved in the United States for procedural sedation in adults. This report describes an infant who inadvertently received an intravenous infusion of dexmedetomidine at a rate which was 60 times greater than intended. We describe the hemodynamic, respiratory, and sedative effects of this overdose.

Incidence and predictors of hypertension during high-dose dexmedetomidine sedation for pediatric MRI

This study reviewed the hypertensive response of a large population of children to high-dose dexmedetomidine sedation with the aim of determining the incidence and predictors of hypertension.

BACKGROUND

When dexmedetomidine is used to provide sedation for children, fluctuations in blood pressure have been described in case reports. We report the incidence and predictors of hypertension in a large series of children who received dexmedetomidine.

METHODS/MATERIALS

At our institution, a computerized database holds patient demographics, sedation outcomes, adverse events, and hemodynamic data for all children who receive dexmedetomidine sedation for radiological imaging studies. After Institutional Review Board approval, this database was reviewed.

RESULTS

Three thousand five hundred twenty-two (3522) children received dexmedetomidine sedation between May 1, 2007 and December 31, 2008 for magnetic resonance imaging studies. Median age was 3.6 years (interquartile range: 1.8-5.9). A total of 172 patients (4.9%) developed hypertension, with a higher incidence in the younger age group (0-3 years) when compared to the older age groups (3-18 years) (P < 0.05). Multivariable logistic regression modeling confirmed that younger age (Wald test = 43.5 of 5 degrees of freedom, P < 0.001) and more than one bolus (Wald test = 22.7, P < 0.001) were highly significant predictors of the occurrence of hypertension.

CONCLUSION

When high-dose dexmedetomidine is used for pediatric sedation for MR imaging, the incidence of hypertension is low. Hypertension is most likely to occur in children <1 year of age during the continuous infusion, after they have received more than one bolus of dexmedetomidine.

Electroencephalographic Narcotrend Index monitoring during procedural sedation and analgesia in children

BACKGROUND

The electroencephalographic Narcotrend Index (NI) may potentially help to titrate sedative medication during diagnostic and therapeutic procedures in children.

METHODS

With local ethics committee approval and informed parental consent, 31 patients, aged 8.9 +/- 4.3 years, scheduled for elective upper gastrointestinal endoscopy were enrolled in this prospective, double-blinded observational study. Initially, patients received a single dose of intravenous piritramide 0.1 mg x kg(-1), followed by propofol 2 mg x kg(-1) and, if necessary, additional propofol doses (0.5 mg x kg(-1)) to achieve and maintain a level of deep sedation throughout the procedure. Sedation was assessed by the University of Michigan Sedation Scale (UMSS). We investigated the relationship between depth of sedation, and the NI, and the classical EEG parameters (cEEG), total EEG power (Power), spectral edge (SEF) and median frequency, and relative power in the beta, alpha, theta and delta bands. The performance of the NI and cEEG parameters was evaluated by prediction probability (P(K)), receiver operating characteristic (ROC) and Spearman rank order correlation analysis.

RESULTS

Mean P(K) values for NI (0.88) vs UMSS were higher than for the other cEEG parameters, except for Power (0.82) and SEF(0.81). Spearman correlation analysis revealed superiority of the NI over all cEEG parameters. The area under the curve for the NI was 0.93, which was superior to all other EEG parameters beside Power (0.86) and relative power in alpha (0.82).

CONCLUSIONS

The results of this study suggest that the NI may be an objective nondisruptive tool for assessment of hypnotic depth in children under propofol-induced procedural sedation.

High dose dexmedetomidine as the sole sedative for pediatric MRI

OBJECTIVE

This large-scale retrospective review evaluates the sedation profile of dexmedetomidine.

AIM

To determine the hemodynamic responses, efficacy and adverse events associated with the use of high dose dexmedetomidine as the sole sedative for magnetic resonance imaging (MRI) studies.

BACKGROUND

Dexmedetomidine has been used at our institution since 2005 to provide sedation for pediatric radiological imaging studies. Over time, an effective protocol utilizing high dose dexmedetomidine as the sole sedative agent has evolved.

METHODS/MATERIALS

As part of the ongoing Quality Assurance process, data on all sedations are reviewed monthly and protocols modified as needed. Data were analyzed from all 747 consecutive patients who received dexmedetomidine for MRI sedation from April 2005 to April 2007.

RESULTS

Since 2005, the 10-min loading dose of our dexmedetomidine protocol increased from 2 to 3 microg.kg(-1), and the infusion rate increased from 1 to 1.5 to 2 microg.kg(-1).h(-1). The current sedation protocol progressively increased the rate of successful sedation (able to complete the imaging study) when using dexmedetomidine alone from 91.8% to 97.6% (P = 0.009), reducing the requirement for adjuvant pentobarbital in the event of sedation failure with dexmedetomidine alone and decreased the mean recovery time by 10 min (P < 0.001). Although dexmedetomidine sedation was associated with a 16% incidence of bradycardia, all concomitant mean arterial blood pressures were within 20% of age-adjusted normal range and oxygen saturations were 95% or higher.

CONCLUSION

Dexmedetomidine in high doses provides adequate sedation for pediatric MRI studies. While use of high dose dexmedetomidine is associated with decreases in heart rate and blood pressure outside the established 'awake' norms, this deviation is generally within 20% of norms, and is not associated with adverse sequelae. Dexmedetomidine is useful as the sole sedative for pediatric MRI.

Hemodynamic effects of dexmedetomidine sedation for CT imaging studies

BACKGROUND

Dexmedetomidine sedation for radiological imaging studies is a relatively recent application for this drug. Previous studies have demonstrated some haemodynamic effects of dexmedetomidine, however, the effects remain poorly described in children. The aim of this study was to better define the effect of age on heart rate (HR) and blood pressure changes in children sedated for CT imaging with dexmedetomidine.

METHODS/MATERIALS

At our institution dexmedetomidine is given for sedation for CT imaging as a bolus of 2 mcg.kg(-1) over 10 min followed by an infusion of 1 mcg.kg(-1).h(-1) with a second bolus if required. Detailed quality assurance data sheets document patient demographics, sedation outcomes, adverse events, and hemodynamic data are recorded for each patient.

RESULTS

A total of 250 patients (range 0.1-10.6 years) received dexmedetomidine. ANOVA revealed strong evidence for changes in HR and mean arterial blood pressure during bolus and infusion relative to presedation values (P < 0.001). These changes were apparent in each age group and similar between groups. During the first bolus and during infusion, 82% and 93% of patients respectively were within the age-based normal range for HR. For mean arterial blood pressure, 70% of patients were within the normal range during first bolus and 78% during infusion.

CONCLUSION

In the pediatric population studied, intravenous dexmedetomidine sedation was associated with modest fluctuations in HR and blood pressure. Hemodynamic changes were independent of age, required no pharmacologic interventions and did not result in any adverse events. By anticipating these possible hemodynamic effects and avoiding dexmedetomidine in those patients who may not tolerate such fluctuations in HR and blood pressure, dexmedetomidine is an appropriate sedative for children undergoing CT imaging.

Bispectral Index asymmetry and COMFORT score in paediatric intensive care patients

BACKGROUND

The Bispectral Index (BIS) monitor has been suggested as a potential tool to measure depth of sedation in paediatric intensive care unit (PICU) patients. The primary aim of our observational study was to assess the difference in BIS values between the left and right sides of the brain. Secondary aims were to compare BIS and COMFORT score and to assess change in BIS with tracheal suctioning.

METHODS

Nineteen ventilated and sedated PICU patients had paediatric BIS sensors applied to either side of their forehead. Each patient underwent physiotherapy involving tracheal suctioning. Their BIS data and corresponding COMFORT score, assessment as by their respective nurses, were recorded before, during, and after physiotherapy.

RESULTS

Seven patients underwent more than one physiotherapy session; therefore, 28 sets of data were collected. The mean BIS difference values (and 95% CI) between left BIS and right BIS for pre-, during, and post-physiotherapy periods were 9.2 (5.9-12.5), 15.8 (11.9-19.7), and 7.5 (5.2-9.7), respectively. Correlation between mean BIS, left brain BIS, and right brain BIS to COMFORT score was highly significant (P<0.001 for all three) during the pre- and post-physiotherapy period, but less so during the stimulated physiotherapy period (P=0.044, P=0.014, and P=0.253, respectively).

CONCLUSIONS

A discrepancy between left and right brain BIS exists, especially when the patient is stimulated. COMFORT score and BIS correlate well between light and moderate sedation.

Effect of age and sedative agent on the accuracy of bispectral index in detecting depth of sedation in children

OBJECTIVE

This study evaluated age- and sedative agent-related differences in bispectral index across observed sedation levels in a large sample of children < 18 years of age.

PATIENTS AND METHODS

With institutional review board approval and waiver of consent, data from 4 independently conducted studies were combined in a secondary analysis of 3373 observations from 248 children aged 1 month to 18 years. In these studies, bispectral index values of sedated children were recorded in a blinded fashion, and sedation depth was scored using the University of Michigan Sedation Scale (UMSS). Bispectral index was evaluated across UMSS scores for several age groups and during use of each sedative agent (with/without opioids).

RESULTS

There was a moderate inverse correlation between bispectral index and UMSS for all age groups. There were significant differences in bispectral index across UMSS and between each sedation level except UMSS 3 to 4 in all the age groups and UMSS 0 to 1 in infants. The mean bispectral index and the cutoff values on the receiver-operating-characteristic curve for mild, moderate, and deep sedation were significantly lower in infants < or = 6 months compared with older children at each sedation level. Bispectral index was reasonably sensitive and specific in differentiating mild (UMSS 0-1) from deeper (UMSS 3-4) levels of sedation but poorly differentiated between moderate and deep levels of sedation in all age groups. There was a moderate correlation between bispectral index and UMSS during the use of chloral hydrate, pentobarbital, propofol, and midazolam but poor correlation during ketamine or opioid use. Bispectral index values were significantly lower during deep sedation with propofol and pentobarbital compared with midazolam and chloral hydrate.

CONCLUSIONS

Our findings suggest that, although bispectral index may differentiate light from deep sedation in most children, bispectral index must be interpreted cautiously in sedated children, with particular consideration given to patient age and use of sedative agents.

Monitoring the anaesthetic depth in children - an update

PURPOSE OF REVIEW

There are several commercially available electroencephalogram-derived devices for monitoring anaesthesia depth. This article reviews all published studies describing their use in children; first assessing studies of performance in measuring anaesthesia depth in observational, physiological studies and then describing relevant outcome studies. There is also a brief discussion of why they might be useful, what physiological problems may arise and what the reader should be wary of in the methodology of these studies. The subject is approached from a clinical perspective.

RECENT FINDINGS

There are several physiological studies suggesting that for older children the bispectral index, entropy, Narcotrend index, cerebral state index and A-line ARX index all change with induction of anaesthesia, and have reasonable correlations with doses of anaesthetic agent. There is consistent evidence that the performances are substantially poorer in infants. Some of these devices have been demonstrated to reduce anaesthesia drug consumption and hasten recovery in older children.

SUMMARY

The bispectral index is the most widely studied, but at this stage there is no evidence to suggest any one device is substantially superior to any other. There may be a role emerging for their use in older children, but their use in infants cannot be supported.

Level of sedation evaluation with Cerebral State Index and A-Line Arx in children undergoing diagnostic procedures

BACKGROUND

Monitoring of anesthesia depth is difficult clinically, particularly in children. The aim of this study was to assess the correlation existing between CSI (Cerebral State Index), or AAI (A-line ARX) and a clinical sedation scale such as UMSS (University of Michigan Sedation Scale), during deep sedation with propofol in children undergoing diagnostic procedures.

METHODS

Twenty ASA I and II children, scheduled to undergo deep sedation for magnetic resonance imaging (MRI) or Esophagogastroduodenoscopy (EGDS), were enrolled. The patients were randomly assigned to receive depth of anesthesia monitoring with CSI or AAI. The anesthetist administered repeated doses of propofol every 10 s to a UMSS score of 3-4. An attending anesthetist, not involved in drug administration, recorded time and doses of sedation medications, vital signs, UMSS score and CSI or AAI score. All the evaluations were recorded at awake state (baseline), every 10 s until an UMSS score of 3-4 and every 3 min until the children were awake.

RESULTS

We enrolled 13 males and seven females ranging in age from 8 months to 7 years. After induction of anesthesia CSI and AAI scores decreased and from the end of the procedure to emergence the two scores increased. The CSI data showed a strong correlation with the UMSS scores (r = -0.861; P < 0.0001); we found a similar correlation between the AAI data and the UMSS scores (r = -0.823; P < 0.0001).

CONCLUSIONS

Our study suggests that CSI and AAI may be two, real-time and objective tools to assess induction and emergence during propofol sedation in children undergoing EGDS and MRI.