Epidural analgesia improves outcome following pediatric fundoplication. A retrospective analysis

Postoperative Pain Management in children: guidance from the Pain Committee of the European Society for Paediatric Anaesthesiology (ESPA Pain Management Ladder Initiative) Part II

The ESPA Pain Management Ladder Initiative is a clinical practice advisory based upon expert consensus supported by the current literature to help ensure a basic standard of perioperative pain management for all children. In 2018 the perioperative pain management of six common pediatric surgical procedures was summarised. The current Pain Management Ladder recommendations focus on five more complex pediatric surgical procedures and suggest basic, intermediate, and advanced pain management methods. The aim of this paper is to encourage best possible pain management practice and to support institutions to create their own pain management concepts according to their financial and human resources due to the diversity of clinical settings in Europe. Furthermore, the authors underline that these recommendations are intended for inpatients only.

Caudal catheter placement for repeated epidural morphine doses after neonatal upper abdominal surgery

Effective pain control after major surgery in neonates presents many challenges. Parenteral opioids (and co-analgesics) are often used but inadequate analgesia and oversedation are not uncommon. Although continuous thoracic epidural analgesia is highly effective and opioid-sparing, its associated risks and the need for staff with specialised skills and/or neonatal intensive care unit staff buy-in may preclude this option even in many academic centres. We present the case of a six-day-old infant who underwent upper abdominal surgery and received intermittent morphine doses via a tunnelled caudal epidural catheter, which provided satisfactory analgesia and facilitated early extubation.

Comparison of landmark and real-time ultrasound-guided epidural catheter placement in the pediatric population: a prospective randomized comparative trial

Background

Epidural block placement in pediatric patients is technically challenging for anesthesiologists. The use of ultrasound (US) for the placement of an epidural catheter has shown promise. We compared landmark-guided and US-guided lumbar or lower thoracic epidural needle placement in pediatric patients.

Methods

This prospective, randomized, comparative trial involved children aged 1–6 years who underwent abdominal and thoracic surgeries. Forty-five children were randomly divided into two groups using a computer-generated random number table, and group allocation was performed by the sealed opaque method into either landmark-guided (group LT) or real-time ultrasound-guided (group UT) epidural placement. The primary outcome was a comparison of the procedure time (excluding US probe preparation). Secondary outcomes were the number of attempts (re-insertion of the needle), bone contacts, needle redirection, skin-to-epidural distance using the US in both groups, success rate, and complications.

Results

The median (interquartile range) time to reach epidural space was 105.5 (297.0) seconds in group LT and 143.0 (150) seconds in group UT (P = 0.407). While the first attempt success rate was higher in the UT group (87.0% in UT vs. 40.9% in LT; P = 0.004), the number of bone contacts, needle redirections, and procedure-related complications were significantly lower.

Conclusions

The use of US significantly reduced needle redirection, number of attempts, bone contact, and complications. There was no statistically significant difference in the time to access the epidural space between the US and landmark technique groups.

Ambulatory Pain Management in the Pediatric Patient Population

PURPOSE OF REVIEW

Outpatient surgery in the pediatric population has become increasingly common. However, many patients still experience moderate to severe postoperative pain. A poor understanding of the extent of pain after pediatric ambulatory surgery and the lack of randomized control studies of pain management of the outpatient necessitate this review of scientific evidence and multimodal analgesia.

RECENT FINDINGS

A multimodal approach to pain management should be applied to the ambulatory setting to decrease postoperative pain. These include non-pharmacological techniques, multimodal pharmacologics, and neuraxial and peripheral nerve blocks. Postoperative pain management in pediatric ambulatory surgical patients remains suboptimal at most centers due to limited evidence-based approach to postoperative pain control. Pediatric ambulatory pain management requires a multipronged approach to address this inadequacy.

Comparison between epidural and opioid analgesia for infants undergoing major abdominal surgery

BACKGROUND

Epidural analgesia is considered optimal for postoperative pain management after major abdominal surgery. The potential to decrease anesthetic and opioid exposure is particularly desirable for infants, given their vulnerability to respiratory depression and concern for anesthetic neurotoxicity. We reviewed our experience with infants undergoing major abdominal surgery to determine if epidural catheter use decreased anesthetic and opioid exposure and improved postoperative analgesia.

METHODS

This retrospective cohort study included infants (<12 months) who underwent exploratory laparotomy, ureteral reimplantation, or bladder exstrophy repair between November 2011 and November 2014. Primary outcomes of anesthetic exposure (mean endtidal sevoflurane) and intraoperative opioid administration were compared between infants who received epidural catheters and those who did not. Secondary outcomes included postoperative pain and sedation scores and morphine equivalents administered 0-24 and 24-48 hours after surgery.

RESULTS

Of 158 eligible infants, 82 were included and 47 received epidurals. Patients with epidurals underwent bladder exstrophy repair (N = 9), ureteral reimplantation (N = 8), and exploratory laparotomy (N = 30). Infants with epidurals received less intraoperative fentanyl (2.6 mcg/kg (0,4.5) vs 3.3 mcg/kg (2.4,5.8), P = 0.019) and morphine (6% (3/47) vs 26% (9/35), P = 0.014) in univariate analysis. After controlling for age and emergency surgery, differences in long-acting opioid administration persisted, with significantly less morphine given in the epidural group (OR 0.181; 95% CI 0.035-0.925; P = 0.040). Mean endtidal sevoflurane concentrations were similar between groups. There was no significant difference in postoperative median morphine equivalents.

CONCLUSION

Placement of epidural catheters in infants undergoing major abdominal surgery is associated with decreased long-acting opioid requirements intraoperatively. Epidural placement does not preclude opioid exposure however, as opioids may be administered for indications other than nociceptive pain in the difficult-to-assess postoperative infant. Further prospective studies are warranted to better quantify the effect of epidural analgesia on intraoperative anesthetic exposure in infants.

Estimation of the depth of the thoracic epidural space in children using magnetic resonance imaging

BACKGROUND

The estimation of the distance from the skin to the thoracic epidural space or skin to epidural depth (SED) may increase the success rate and decrease the incidence of complications during placement of a thoracic epidural catheter. Magnetic resonance imaging (MRI) is the most comprehensive imaging modality of the spine, allowing for the accurate determination of tissue spaces and distances. The present study uses MRI-derived measurements to measure the SED and define the ratio between the straight and inclined SEDs at two thoracic levels (T_6-7 and T_9-10) in children.

METHODS

The T₂-weighed sagittal MRI images of 109 children, ranging in age from 1 month to 8 years, undergoing radiological evaluation unrelated to spine pathology were assessed. The SEDs (inclined and straight) were determined, and a comparison between the SEDs at two thoracic levels (T_6-7 and T_9-10) was made. Univariate and multivariate linear regression models were used to assess the relationship of the inclined thoracic T_6-7 and T_9-10 SED measurements with age, height, and weight.

RESULTS

Body weight demonstrated a stronger association with the SED than did the age or height with R² values of 0.6 for T_6-7 and 0.5 for T_9-10. The formulae describing the relationship between the weight and the inclined SED were T_6-7 inclined (mm) = 7 + 0.9 × kg and T_9-10 inclined (mm) = 7 + 0.8 × kg.

CONCLUSION

The depth of the pediatric thoracic epidural space shows a stronger correlation with weight than with age or height. Based on the MRI data, the predictive weight-based formulas can serve as guide to clinicians for placement of thoracic epidural catheters.

Dexamethasone as an Adjuvant to Bupivacaine in Supraclavicular Brachial Plexus Block in Paediatrics for Post-operative Analgesia

INTRODUCTION

Sensory blockade of the brachial plexus with local anaesthetics for perioperative analgesia leads to stable haemodynamics intraoperatively, smoother emergence from general anaesthesia and decreased need for supplemental analgesics or suppositories in the Post-operative period. However, increasing the duration of local anaesthetic action is often desirable because it prolongs surgical anaesthesia and analgesia. Various studies in adults prove that steroids increase the duration of action of local anaesthetics when used as adjuncts.

AIM

The study aimed at determining the efficacy of dexame-thasone as an adjuvant to bupivacaine for Post-operative analgesia following sensory blockade of the brachial plexus in paediatrics.

MATERIALS AND METHODS

The study was divided into two groups of 15 each, group BD receiving dexamethasone (0.1mg/kg) as an adjunct to bupivacaine 0.125% and group B receiving bupivacaine alone. The duration of analgesia was taken as time from completion of the block to the patient receiving rescue analgesia, the haemodynamics were measured until 180 minutes after surgery, the incidence of Post-operative Nausea and Vomiting (PONV) was measured.

RESULTS

The duration of analgesia in the group BD was 27.1±13.4 hours and was significantly higher as compared to the group B, in which it was 13.9±11.3 hours (p<0.05). The pulse rate measured Post-operatively between both groups at 20 minutes (p-value 0.634), 60 minutes (p-value 0.888), 120 minutes (p-value 0.904) and 180 minutes (p-value 0.528) showed no statistical significance. Likewise the mean blood pressure measured between the two groups at 20 minutes, 60 minutes, 120 minutes and 180 minutes Post-operatively showed no significance. There was no significant difference in incidence of PONV in both groups with p-value of 0.624.

CONCLUSION

Dexamethasone as an adjuvant to local anaesthetic in brachial plexus blocks significantly, prolongs duration of analgesia in children undergoing upper limb surgeries.

An observational study of the macro- and micro-haemodynamic implications of epidural anaesthesia in children

The haemodynamic implications of epidural anaesthesia in children are poorly documented. We report macro- and micro-haemodynamic data from an observational study of 25 children ranging from neonates to six-years old, who underwent surgery conducted with a specific combination of monitoring systems. We analysed 90 min of study-related monitoring after epidural catheterisation, with skin incision taking place after around 30 min. We recorded macrohaemodynamic parameters (monitored using LiDCOrapid) including heart rate, mean arterial pressure, cardiac output, stroke volume, systemic vascular resistance and stroke volume variation. Microhaemodynamic parameters (monitored using Invos™) included cerebral and peri-renal oxygenation. Based on the entire 90 min of study-related monitoring, we found significant increases in cardiac output (p = 0.009), stroke volume (p = 0.006) and stroke volume variation (p = 0.008), as well as decreases in systemic vascular resistance (p = 0.007) around 30 min after epidural blockade. There were no significant changes in heart rate, arterial pressure and cerebral or peri-renal oxygenation during these 90 min. Considering that the microhaemodynamic parameters were not affected by the macrohaemodynamic changes, we conclude that autoregulation of the brain and the kidneys was maintained in children under epidural anaesthesia.

Evaluation of the skin to epidural and subarachnoid space distance in young children using magnetic resonance imaging

BACKGROUND AND OBJECTIVES

Epidural catheters placed for perioperative analgesia in young children confer clinical benefits but are technically challenging to insert. Approximations of the skin to epidural space depth in this population are limited to direct needle measurement and ultrasonography. Magnetic resonance imaging (MRI) is the most comprehensive imaging modality of the spine. This study aims to produce a more clinically useful formula from MRI data to estimate pediatric epidural depth.

METHODS

Seventy children with normal lumbar spine MR images were enrolled. After determination of epidural depth, linear regression was used to estimate a weight-based formula. Analysis of variance and bootstrap methods were used to evaluate this formula against 4 commonly cited formulae. The quality of predictions was evaluated using the mean absolute prediction error.

RESULTS

The estimated weight-based formula as derived by MRI data is given by: skin to epidural depth (mm) = 9.00 + 0.62 * weight in kilograms. The mean absolute prediction error was 2.56 mm (95% confidence interval [95% CI], 2.12-3.04) for the new formula. Additional derived formulae are skin to dorsal dura depth (mm) = 13.52 + 0.71 * weight in kilograms (mean absolute prediction error, 2.48 mm; 95% CI, 2.00-3.03) and skin to ventral dural depth (mm) = 23.08 + 0.86 * weight in kilograms (mean absolute prediction error, 2.50 mm; 95% CI, 2.04-3.06).

CONCLUSIONS

We provide the first predictive formulae, based on MRI data, for pediatric epidural depth estimation.

Applications of regional anaesthesia in paediatrics

Advances in the field of paediatric regional anaesthesia have specific applications to both acute and chronic pain management. This review summarizes data regarding the safety of paediatric regional anaesthetic techniques. Current guidelines are provided for performing paediatric regional techniques, with a focus on applications for postoperative pain management. Brief descriptions of relevant anatomy followed by indications for commonly performed blocks are highlighted along with the potential of adverse side-effects.

Regional anesthesia in neonates and infants

Optimal pain management can significantly impact the surgical outcome and length of stay in the neonatal intensive care unit (NICU). Regional anesthesia is an effective alternative that can be used in both term and preterm neonates. A variety of neuraxial and peripheral nerve blocks have been used for specific surgical and NICU procedures. Ultrasound guidance has increased the feasibility of using these techniques in neonates. Education and training staff in the use of continuous epidural infusions are important prerequisites for successful implementation of regional anesthesia in NICU management protocols.

Major complications related to epidural analgesia in children: a 15-year audit of 3,152 epidurals

BACKGROUND

Complications associated with epidural analgesia in children have a reported incidence of 40-90 in 10,000 epidurals. We sought to determine the incidence of major complications with the use of continuous epidural analgesia that occurred in our centre over the past 15 years and to describe the nature of these complications.

METHODS

The Acute Pain Service database at a tertiary care academic pediatric hospital was reviewed retrospectively over a 15-year period. Data were categorized according to patient age (neonate, infant, child one through eight years, and child > eight years), mode of insertion of the epidural (caudal, transsacral, lumbar, thoracic), complication type, and complication severity.

RESULTS

Over the 15-year period, 3,152 epidurals were performed. The use of caudal-thoracic epidurals in neonates and infants has increased since 2007. Twenty-four major complications were identified (incidence, 7.6 in 1,000 epidurals). The rate of complications in neonates was 4.2% compared with 1.4% in infants, 0.5% in children aged one through eight years, and 0.8% in children over eight years of age. The two most common complications were local skin infection and drug error.

CONCLUSIONS

Our incidence of major complications and our finding that complications were more common in neonates and infants are both consistent with previously published data. The two most common types of complications are potentially preventable.

Pain management in patients with adolescent idiopathic scoliosis undergoing posterior spinal fusion: combined intrathecal morphine and continuous epidural versus PCA

STUDY DESIGN

A retrospective case-comparison study.

OBJECTIVE

Compare efficacy and safety of combined intrathecal morphine (ITM) and epidural analgesia (EPI) to that of conventional intravenous patient-controlled analgesia (IV-PCA) after posterior spinal fusion (PSF) for adolescent idiopathic scoliosis (AIS).

SUMMARY OF BACKGROUND DATA

Pain control after PSF in AIS has been managed traditionally with IV-PCA. More recently studies have shown improvement in pain control with the use of continuous EPI or intraoperative ITM. No studies to our knowledge have compared the use of both ITM and EPI analgesia to that of IV-PCA.

METHODS

An Institutional Review Board-approved retrospective case-comparison study was performed from 1989 to 2009 of all patients undergoing PSF for AIS. Patients received either IV-PCA or ITM/EPI. Daily pain scores were recorded along with total opioid and benzodiazepine use. Adverse events were recorded for all the patients.

RESULTS

A total of 146 patients were initially included in the study; 95 patients received ITM/EPI and 51 received IV-PCA as a historical control. Eight patients from the ITM/EPI group were excluded from the pain comparison portion of the study. There were no statistical differences in age, sex, weight, or hospital stay between the 2 groups. The ITM/EPI group had, on average, 1 additional level of fusion (P = 0.001). Daily average pain scores were lower in the ITM/EPI group on all hospital days, and statistically lower in days 1 and 3 to 5. Total opioid requirement was significantly lower in the ITM/EPI patients, although oral opioid use was higher among this group. Total benzodiazepine use was lower among the IV-PCA group. A total of 15.7% of the IV-PCA patients had bladder hypotonia, compared with 1.1% of the ITM/EPI group (P = 0.002). The rate of illeus was 15.7% in the IV-PCA patients and 5.7% in the ITM/EPI (P = 0.071). Respiratory depression was reported in 4 ITM/EPI patients, 0 in our PCA group. Technical catheter malfunction was reported in 8.5% of the EPI group.

CONCLUSIONS

The use of ITM/EPI after PSF for AIS is safe and effective, this methodology provided significantly lower pain scores and lowers total opioid use which can lead to urinary and bowel dysfunction.

Neuraxial analgesia in neonates and infants: a review of clinical and preclinical strategies for the development of safety and efficacy data

Neuraxial drugs provide robust pain control, have the potential to improve outcomes, and are an important component of the perioperative care of children. Opioids or clonidine improves analgesia when added to perioperative epidural infusions; analgesia is significantly prolonged by the addition of clonidine, ketamine, neostigmine, or tramadol to single-shot caudal injections of local anesthetic; and neonatal intrathecal anesthesia/analgesia is increasing in some centers. However, it is difficult to determine the relative risk-benefit of different techniques and drugs without detailed and sensitive data related to analgesia requirements, side effects, and follow-up. Current data related to benefits and complications in neonates and infants are summarized, but variability in current neuraxial drug use reflects the relative lack of high-quality evidence. Recent preclinical reports of adverse effects of general anesthetics on the developing brain have increased awareness of the potential benefit of neuraxial anesthesia/analgesia to avoid or reduce general anesthetic dose requirements. However, the developing spinal cord is also vulnerable to drug-related toxicity, and although there are well-established preclinical models and criteria for assessing spinal cord toxicity in adult animals, until recently there had been no systematic evaluation during early life. Therefore, in the second half of this review, we present preclinical data evaluating age-dependent changes in the pharmacodynamic response to different spinal analgesics, and recent studies evaluating spinal toxicity in specific developmental models. Finally, we advocate use of neuraxial drugs with the widest demonstrable safety margin and suggest minimum standards for preclinical evaluation before adoption of new analgesics or preparations into routine clinical practice.

Ultrasound-guided interscalene brachial plexus block in a pediatric patient with acute hepatitis -A case report-

The interscalene brachial plexus block is not commonly used in pediatric regional anesthesia. The increasing popularity of ultrasound has allowed more anesthesiologists to perform regional anesthesia with high success rates in pediatric patients with the direct visualization of the target nerve and spread of local anesthetics. We present a case of interscalene brachial plexus block under ultrasound guidance in a 17-month-old child with acute drug-induced hepatitis who required fixation of a fracture of the lateral humeral condyle.

Epidural and opioid analgesia following the Nuss procedure

Background

Parents have the right to decide on behalf of their children and deny consent to regional anaesthesia. The investigators decided to investigate quality of postoperative analgesia in adolescents undergoing epidural and opioid analgesia following the Nuss procedure.

Material/Methods

The study subjects were 61 adolescents aged 11–18 years who underwent pectus excavatum repair with the Nuss procedure. Patients were divided into epidural (n=41) and opioid (n=20) groups, depending on their parents’ consent to epidural catheter insertion. Intraoperatively, 0.5% epidural ropivacaine with fentanyl or intermittent intravenous injections of fentanyl were used. Postoperative analgesia was achieved with either epidural infusion of 0.1% ropivacaine with fentanyl, or subcutaneous morphine via an intraoperatively inserted “butterfly” cannula. Additionally, both groups received metamizol and paracetamol. Primary outcome variables were postoperative pain scores (Numeric Rating Scale and Prince Henry Hospital Pain Score). Secondary outcome variables included hemodynamic parameters, additional analgesia and side effects.

Results

Heart rate and blood pressure values in the postoperative period were significantly higher in the opioid group. Pain scores requiring intervention were noted almost exclusively in the opioid group.

Conclusions

Denial of parental consent to epidural analgesia following the Nuss procedure results in significantly worse control of postoperative pain. Our data may be useful when discussing with parents the available anaesthetic techniques for exceptionally painful procedures.

Continuous central and perineural infusions for postoperative pain control in children

PURPOSE OF REVIEW

Continuous infusion remains the technique of choice when there is a prolonged operation or intense postoperative pain is anticipated. Supplementing a general anesthesia with a nerve block can result in a pain-free awakening and postoperative analgesia without the potentially deleterious effects associated with parenteral opioids. The literature confirms the very low rate of complications and adverse effects of regional anesthesia in children.

RECENT FINDINGS

Clinicians need to be aware of the key points for performing a block and placing a catheter in children: good knowledge of anatomic and physiologic differences between adults and children is necessary; the use of newer local anesthetics, such as ropivacaine and levobupivacaine, increases the therapeutic window; and moreover it is mandatory to work with dedicated pediatric equipment.

SUMMARY

The introduction of high-resolution portable ultrasound brought a great advance for the pediatric anesthesiologists; ultrasound-guided visualization of anatomic structures, in fact, allows greater precision of needle and catheter placement, and confirmation that the drug is deposited in the site of choice. This article reviews the safety and efficacy of central and perineural continuous infusions for postoperative pain control in children.

Efficacy of postoperative epidural analgesia in adolescent scoliosis surgery: a meta-analysis

BACKGROUND

Scoliosis surgery is one of the most painful operations performed. Postoperative pain management has been historically based on the use of intravenous opioids. Many of the adolescents who undergo these procedures are at increased risk for opioid-related side effects because of underlying medical problems. Epidural analgesia has been demonstrated to provide superior pain control with fewer side effects for chest and abdominal surgery in children as well as adults. We aim to analyze the available literature for sufficient evidence to allow recommendations regarding the use of epidural analgesia with parenteral opioids vs. intravenous opioids only.

SEARCH STRATEGY

Public Medline and the Cochrane database were searched (1966-10/2008) using scoliosis-related and epidural analgesia-related terms. In Medline, the intersection of these results was combined with Phases 1 and 2 of a highly sensitive search strategy recommended for identifying randomized trials. No limits were used in any search. Additionally, professional journals and proceedings of meetings were screened, and nationally recognized experts in the field of pediatric pain management were asked for further sources of data.

SELECTION CRITERIA

Randomized, controlled trials comparing the use of a continuous infusion of epidural local anesthetics plus intravenous opioids vs. intravenous opioids only for postoperative pain management in adolescent scoliosis repair were eligible for inclusion in the meta-analysis. All studies had to include at least the primary outcome of interest, postoperative pain scores.

DATA COLLECTION AND ANALYSIS

After the development of a data collection and extraction form, two independent reviewers extracted all. No data conflicts were encountered. Data were analyzed with Review Manager when possible, significance for difference between relative rates between groups was analyzed by chi-square tests.

MAIN RESULTS

Average pain scores were lower in the epidural group than no epidural group at 24, 48 and 72 h after surgery. Pain scores (0-100) were lower on all first three postoperative days (POD) in the epidural group: -15.2 on POD1, -10.1 on POD2 and -11.5 on POD3. Differences were significant in the summary analysis for all 3 days (P < 0.05).

AUTHORS' CONCLUSION

Epidural analgesia is beneficial to patients in terms of improving pain control and reducing side effects. The influence on respiratory depression, length of stay in the intensive care unit, or mortality is not available in the literature at this time.

Consent issues and pediatric regional anesthesia

The need for consent to regional anesthetic procedures varies considerably between countries. It is likely that legislation and professional guidance will tighten consent procedures, and in several countries detailed written consent is required for regional blockade. This article discusses aspects of consent to regional anesthesia in children.

Continuous lumbar/thoracic epidural analgesia in low-weight paediatric surgical patients: practical aspects and pitfalls

PURPOSE

Continuous epidural anaesthesia attenuates perioperative stress and avoids the need for systemic opioids. In addition, it may prevent the need for postoperative mechanical ventilation. The aim of the study was to prospectively follow the perioperative course of young infants treated with continuous thoracic/lumbar epidural anaesthesia for major surgery.

METHODS

Data were collected prospectively from 44 epidural anaesthetics in 40 infants (18 premature or former premature) weighing 1,400-4,300 g who underwent major abdominal surgery (33 cases), thoracic surgery (5), or both (1), or ano-rectal surgery (5) at our centre.

RESULTS

Epidural placement was achieved easily in all cases, with high quality analgesia for 24-96 h. Tracheal extubation was delayed after 4 anaesthetics due to muscle relaxant overdose (n = 1), surgeon's request (n = 2), and systemic opioid administration before epidural anaesthesia was considered (n = 1). Intraoperative complications included haemodynamic instability (n = 1) and vascular catheter placement (n = 5). Postoperative complications included meningitis (n = 1), insertion site erythema (n = 7), apnoea (n = 6; 4 premature and 2 full-term infants) and tracheal re-intubation (n = 6).

CONCLUSIONS

Continuous epidural analgesia is effective in low-weight infants undergoing major surgery. The trachea may be extubated immediately after surgery. Attention should be paid to the unique anatomical, physiological, and pharmacological aspects. The patients should be monitored carefully for pain, respiratory failure, and meningitis (an extremely rare complication).

Pharmacologic management of acute pediatric pain

The accurate assessment and effective treatment of acute pain in children in the hospital setting is a high priority. During the past 2 to 3 decades, pediatric pain management has gained tremendous knowledge with respect to the understanding of developmental neurobiology, developmental pharmacology the use of analgesics in children, the use of regional techniques in children, and of the psychological needs of children in pain. A wide range of medications is available to treat a variety of pain types. This article provides an overview of the most common analgesic medications and techniques used to treat acute pain in children.

Combined epidural and general anesthesia for paediatric renal transplantation-a single center experience

BACKGROUND

Appropriate anesthesia for pediatric renal transplantation requires stable intraoperative hemodynamics, optimal perfusion of the newly transplanted kidney and good analgesia during recovery. The aim of this study was to assess the preliminary application, success and safety of combined epidural and general anesthesia in pediatric renal transplantation in a small cohort.

METHODS

We retrospectively reviewed the anesthesia records of 46 consecutive pediatric patients who received renal transplantation under combined epidural and general anesthesia from January 2003-2007.

RESULTS

The mean patient age and weight were 13.2 +/- 2.4 years and 25.7 +/- 5.46 kg, respectively. The infused crystalloids, 20% albumin and red blood cell concentrates were 120 +/- 2 mL/kg to achieve a CVP of 13 to 15 mm Hg. Brisk diuresis was observed in all patients. Epidural tramadol (2 mg/kg) provided good postoperative analgesia in 89% patients. 15% patients developed radiological evidence of pulmonary edema, only one required mechanical ventilation for hypoxemia. Minor adverse effects were nausea and vomiting (17.5%) and convulsions (8.5%). No perioperative mortality or major morbidity was recorded.

CONCLUSION

Epidural anesthesia is a useful adjunct to general anesthesia due to stable intraoperative haemodynamics and good postoperative analgesia.

Regional anesthesia for postoperative pain control in children: focus on continuous central and perineural infusions

Regional anesthesia is widely employed for postoperative pain control in both adults and children. Central or perineural approaches can be performed as a bolus injection or as a continuous infusion of local anesthetics. However, bolus injections, even with the addition of adjuvants, are inadequate for prolonged surgery and long-term pain control. Continuous infusion remains the technique of choice when there is a prolonged operation or intense postoperative pain. This article reviews the safety and efficacy of central and perineural continuous infusions for postoperative pain control in children. The literature confirms the very low rate of complications and adverse effects of regional anesthesia in children. However, clinicians need to be aware of the key points for performing a block and placing a catheter in children: good knowledge of anatomic and physiologic differences between adults and children is necessary; the use of newer local anesthetics, such as ropivacaine and levobupivacaine, increases the therapeutic window; and that it is mandatory to work with dedicated pediatric equipment. Through the use of new techniques such as nerve mapping and/or ultrasound the success of blocks can be improved and the risks reduced.

Epidural catheter placement in children: comparing a novel approach using ultrasound guidance and a standard loss-of-resistance technique

BACKGROUND

We report a prospective, randomized study to evaluate ultrasound guidance for epidural catheter placement in children 0-6 yr of age.

METHODS

Epidural catheters were placed at lumbar or thoracic cord levels in 64 children undergoing major surgery, using either ultrasonography or loss-of-resistance (LOR) for guidance. Using a 5-10 MHz linear ultrasound probe, the neuraxial structures were identified, the skin-epidural depth and epidural space was measured, the advancing epidural catheter visualized, and the spread of local anaesthetic verifying catheter position was confirmed. Epidural placement procedures were analysed for bone contacts and speed of execution. Children under 6 months were analysed separately.

RESULTS

Epidural placement involved bone contacts in 17% of children in the ultrasound group and 71% of children in the LOR group (P<0.0001). Epidurals were executed more swiftly in the ultrasound group [162 (75) s vs 234 (138) s; P<0.01]. Children under 6 months revealed a 0.9 correlation between skin-epidural depth and body weight.

CONCLUSIONS

Ultrasonography is a useful aid to verify epidural placement of local anaesthetic agents and epidural catheters in children. Advantages include a reduction in bone contacts, faster epidural placement, direct visualization of neuraxial structures and the spread of local anaesthetic inside the epidural space. Ultrasound guidance requires additional training and good manual skills, and should only be used once experience in ultrasound-guided techniques of regional anaesthesia has been acquired.

Imaging techniques for regional nerve blockade and vascular cannulation in children

PURPOSE OF REVIEW

This review identifies the most serious complications likely to be encountered in the current practice of paediatric anaesthesia.

RECENT FINDINGS

The findings of the ASA Closed Claims Project, published in 1993, showed a higher proportion of closed paediatric malpractice claims related to respiratory events than to cardiovascular events. The Pediatric Perioperative Cardiac Arrest Registry--an offshoot of the American Society of Anesthesiologists Closed Claims Project--reviewed cardiac arrest data collected between 1994 and 1997, revealing a shift in the aetiology of cardiac arrest during paediatric anaesthesia over the past 20 years. The study found that reported cardiac arrests were now more prevalent from cardiovascular causes than respiratory causes, unlike the findings in the previous Closed Claims Project. Follow-up data collected by both the Pediatric Perioperative Cardiac Arrest Registry and the American Society of Anesthesiologists Closed Claims Project confirm this trend.

SUMMARY

Outcomes for paediatric patients undergoing anaesthesia have improved over the years as a result of advances in monitoring and equipment, safer and more easily titratable anaesthetic agents, and possibly the practice of subspecialization. Preventable complications still, however, occur. An awareness of frequently encountered complications during paediatric anaesthesia may lead to the earlier detection and treatment of perioperative problems, leading to better outcomes.

Small risk of serious neurologic complications related to lumbar epidural catheter placement in anesthetized patients

Previous studies have identified pain during needle/catheter placement or during the injection of local anesthetic as a risk factor for the development of persistent paresthesias after regional anesthetic techniques. The performance of regional blockade on anesthetized patients theoretically increases the risk of postoperative neurologic complications, because these patients are unable to respond to painful stimuli. In this study, we evaluated the frequency of neurologic complications in 4298 thoracic surgical patients undergoing lumbar epidural catheter placement while under general anesthesia. Catheters were placed immediately after the induction and tracheal intubation or on completion of the surgical procedure, before emergence. Most epidural catheters (4220, or 98.2%) were used solely for postoperative analgesia; only 78 (1.8%) epidural catheters were used for intraoperative anesthesia. In 4239 (98.6%) patients, an opioid alone was administered. The remaining 56 (1.3%) patients received a local anesthetic or local anesthetic/opioid mixture epidurally. Analgesia was graded as excellent or good in 92.2% of patients. Side effects included sedation in 455 (10.6%), nausea or emesis in 328 (7.6%), pruritus in 116 (2.7%), and respiratory depression (pH <or=7.3 and PaCO(2) >or=50 mm Hg) in 308 (7.2%) patients. The mean duration of epidural analgesia was 2.4 +/- 0.8 days (range, 0-10.7 days). There were no neurologic complications, including spinal hematoma, epidural abscess or catheter site infections, radicular symptoms, or persistent paresthesias (95% confidence interval, 0%-0.08%). In one patient, the epidural catheter broke during removal, and a portion was retained. The patient was notified; no long-term sequelae were noted. Six patients developed new neurologic symptoms or postoperative worsening of a previous neurologic condition unrelated to epidural catheterization. We conclude that the risk of neurologic complications associated with lumbar epidural catheter placement in anesthetized patients is small. However, the relative risk of this practice, compared with epidural catheter placement in awake patients, is unknown.

IMPLICATIONS

We report no neurologic complications in 4298 patients undergoing epidural catheter placement while under general anesthesia. Although the risk of neurologic complications associated with lumbar epidural catheter placement in anesthetized patients is small, the relative risk compared with epidural catheterization in awake patients is unknown.

Thoracic epidural catheter placement via the caudal approach in infants by using electrocardiographic guidance

We examined the success of inserting epidural catheters via the caudal route in infants by using electrocardiographic guidance. A case series of 20 patients with thoracic epidural analgesia was studied. After the induction of general anesthesia, an 18-gauge IV catheter was inserted into the caudal space to allow threading of a 20-gauge epidural catheter. The electrocardiogram (ECG) tracings via the epidural catheter, as well as the surface ECG at the target spine level, were recorded simultaneously with a modified two-channel five-lead ECG system. The epidural catheter was advanced from the caudal space until the tip reached the target level as demonstrated by a match in the configuration of the epidural ECG tracing to that of the surface ECG tracing at the target level. The catheter tip location was verified by postoperative radiographs. All catheter tips were located within two vertebrae of the target level, and satisfactory intraoperative epidural anesthesia was achieved in all subjects.

IMPLICATIONS

Epidural electrocardiography may be used to guide the positioning of the thoracic epidural catheter tip via the caudal approach to the appropriate dermatome for optimum analgesia.

Thoracic epidural catheters placed by the caudal route in infants: the importance of radiographic confirmation

BACKGROUND

Cephalad advancement of epidural catheters to the thoracic region via the caudal route has been shown to be feasible in neonates and small infants. This has allowed many young infants to receive thoracic level epidural analgesia with dilute local anaesthetic solutions using the simpler caudal approach. Since radiographic confirmation of the catheter tip is routine at this institution, we wished to determine how often radiographic studies led to adjustment or replacement of the epidural catheter.

METHODS

After institutional review board approval, we retrospectively reviewed the medical records of neonates and infants less than 6 months of age who had thoracic or lumbar epidural analgesia via the caudal route between August 1995 and January 2000. Demographic data were recorded, including age, weight and type of surgery. The epidural catheter type, tip location by radiograph and any manipulation of the catheter after the radiograph were also noted.

RESULTS

During the study period, a total of 115 infants were identified as having received caudal placement of a thoracic catheter. Radiographic studies were available for 86 of these infants. The position of 28 (32%) of the epidural catheters was considered to be inadequate after review of the confirmatory radiograph. Ten of these catheters were determined to be in the high thoracic or cervical region and were pulled back to the desired level. Seventeen of these catheters were coiled in the lumbosacral area and 15 of these were replaced at an adequate level. One catheter was found to be outside the epidural space in the presacral area. No correlation could be found between age, weight, type of catheter or type of surgery and the need for catheter manipulation.

CONCLUSIONS

Even in young infants, radiographic determination of the catheter tip appears warranted when thoracic catheters are placed via the caudal route.

The caudal catheter in neonates: where are the restrictions?

PURPOSE OF REVIEW

In neonates, epidural catheters inserted at the sacral hiatus can easily be advanced to a lumbar or thoracic level. These 'caudal catheters' are popular because they allow the neonate to benefit from epidural analgesia without the concerns of spinal cord injury potentially associated with primary thoracic placement in an asleep neonate. This review looks at use and benefits, and risks and complications of caudal epidural catheters in neonates.

RECENT FINDINGS

Restrictions of neonatal caudal catheters are related to risks associated with placement and advancement of the catheters, infectious risks of caudal catheters, and toxicity risks related to the higher free fraction and lower clearance of bupivacaine in neonates. Caudal catheters in neonates are popular, but evidence that they improve outcome is lacking.

SUMMARY

Epidural anesthesia and analgesia for neonates should be performed and managed by pediatric anesthesiologists. Potential risks and complications must be appreciated and all steps to maximize safety of the technique must be taken. In particular, close postoperative observation and pain service management are indispensable. Future research should investigate the risks of caudal and segmentally placed catheters in neonates, study the role of epidural analgesia in outcome improvement for neonates, and guide us to safer use of local anesthetics suitable for neonates with their pharmacologic immaturity.

New concepts in acute and extended postoperative pain management in children

Increased knowledge of the pathophysiology of pain in children and an improved understanding of the pharmacology and pharmacodynamics of multiple agents have provided the clinician with a wide variety of tools to treat postoperative pain in children. The interest in a multimodal approach is kindled by the realization that the combination of a number of therapies can enhance analgesia with fewer untoward side effects. The expertise of other health care professionals should be tapped to open new avenues of treatment. Many therapies still require critical evidence-based evaluations to assess how well they work in larger patient populations. Dedication to research, compassionate patient care, and a willingness to teach the next generation of clinicians will bring us closer to the goal of safe and pain-free surgery.

Analysis of the Physician Variable in Pain Management

BACKGROUND

The role of physician variability in pain management is unknown.

OBJECTIVE

To assess the role of physician variability in the management of pain and provide quantitative data regarding the status of pain management in Michigan.

DESIGN

A multi-item mail survey was used to determine the physician's perceived knowledge of pain management modalities, goals, satisfaction, and confidence with pain treatment. Participants. The focus of this report was a group of 368 licensed Michigan physicians who provide clinical care.

RESULTS

Overall, 30% of the study group reported no formal education in pain management, although younger physicians reported more education (correlation coefficient = -0.252, P <.001). The physicians reported greater confidence in their knowledge of meperidine than other Schedule II opioids (P <.001 ). In regards to the opinion that prescribing strong opioids would attract a medical review, the physician responses ranged from 1 (strongly disagree) to 5 (strongly agree). The median score for this scale was 4, accounting for 46% of the responses. The study group expressed less satisfaction with their treatment of chronic pain as well as lower goals for relief (mean: 3.8; 95% confidence interval: 3.7-3.9).

CONCLUSIONS

Lower expectations for relief and less satisfaction in its management may contribute to the undertreatment of chronic pain. Perceptions of regulatory scrutiny may contribute to suboptimal pain management. These preliminary data highlight physician variability in pain decision making while providing insights into educational needs.

Thoracic epidural analgesia via the caudal approach in pediatric patients undergoing fundoplication using nerve stimulation guidance

IMPLICATIONS

Epidural catheter placement using electrical stimulation guidance is an alternative approach for positioning the catheter into the thoracic region via the caudal space. This easily performed clinical assessment provides optimization of catheter tip positioning for achieving effective pain control.

Is epidural analgesia associated with an improved outcome following open Nissen fundoplication?

Postoperative epidural analgesia is increasingly popular in paediatric practice, although evidence of its benefit is scarce. We performed a retrospective analysis of a series of 104 consecutive open Nissen fundoplications, to determine whether mode of analgesia, epidural (n=65) or opioid infusion (n=39), influenced certain outcome measures, including intensive care utilization, duration of hospital stay, morbidity and mortality. The two groups were similar in terms of demographic characteristics and associated pathologies. Overall, morbidity and mortality (2%) rates were low. Mean duration of hospital stay was significantly greater for the opioid group, compared to those receiving epidural analgesia (13 vs. 8 days, P < 0.05). The number of patients who remained in hospital for more than 7 days was also significantly greater in the opioid group. Accepting the limitations of a retrospective study, these data suggest that epidural analgesia might be associated with an improved outcome following Nissen fundoplication and this merits a prospective study.

Survey of 1057 patients receiving postoperative patient-controlled epidural analgesia

Data were collected from 1057 consecutive patients who received patient-controlled epidural analgesia for postoperative pain relief, using 0.1% bupivacaine with 5 microg x ml(-1) fentanyl in all cases. Prescriptions were not otherwise standardised. On the first postoperative day, 741/801 patients (92.5%) had adequate analgesia and 692/719 (96.2%) were free of nausea. During a total of 3858 treatment days, two patients (0.19%) had an episode of severe respiratory depression and one patient (0.09%) became unrousable. Hypotension occurred in 45 patients (4.3%). There were no cases of epidural haematoma or abscess. We conclude that a patient-controlled epidural analgesia service as described is both efficacious and safe for use on surgical wards.