Sedation and anesthesia for the pediatric patient undergoing radiation therapy

Procedural sedation performed by pediatric critical care physicians for children undergoing daily radiation therapy is effective and safe

Radiation therapy targets tumor tissue and requires children to lay still, often necessitating sedation. Historically anesthesiologists provided procedural sedation, but pediatric critical care physicians now regularly administer sedation outside the operating room. Procedural sedation for radiation poses unique challenges. The objective was to evaluate the success and assess complications of repeated sedations for radiation performed by pediatric critical care physicians. We performed a single-center, retrospective case series of children who received procedural sedation for radiation therapy by PICU physicians. The primary outcome was success, defined as completion of radiation treatment. Secondary outcomes included type of medication, dosing, tolerance, and complications requiring intervention. In our sample, 55 patients underwent 1174 sedation instances (mean 19.8 per patient). Patients had a mean age of 4.7 years (SD3.4), and weight of 20.2 kg (SD11.9). All patients had an ASA of 2 or 3. All patients had either a brain tumor or a non-mediastinal solid tumor. The success rate was 99.8%. The mean duration of sedation was 30.7 min (SD12.4). All sedations included propofol as a first agent with a mean bolus 3.3 mg/kg (SD1.4) and drip rate 148.7 mcg/kg/min (SD39.7). 4.4% of sedations required a second agent medication. There was no significant effect of repeated sedation with regards to the medication amount received (p = 0.97). Laryngospasm occurred during 0.2% of sedations. No patients required bag-mask ventilation, intubation, or chest compressions; no patients died during sedation. Pediatric critical care physicians can perform procedural sedation for radiation therapy successfully.

Supporting paediatric patients to receive radiation therapy without sedation or general anaesthetic

Many paediatric patients experience anxiety and distress when undergoing radiation therapy and, as a result, are often anaesthetised or sedated (A/S) so that they remain still. The practice of using A/S has implications for the child, the family and the health system. Building on the article by McCoola et al. (DOI 10.1002/jmrs.705), this editorial discusses approaches to improving paediatric patients' and their families' experiences of radiation therapy by reducing the need for A/S. Interventions need to be underpinned by theory and adopt robust research methods.

Techniques and Complications of Anesthesia in Pediatric Radiotherapy: A Retrospective Cohort Study

BACKGROUND

Anesthesia during pediatric external beam radiation therapy poses a challenge, as radiotherapy rooms are not designed for the administration of anesthesia.

AIMS

We conducted a retrospective cohort study of children who underwent radiation therapy to describe the anesthetic approach and assess anesthetic-related complications.

MATERIALS AND METHODS

Data of all, who underwent radiation therapy under general anesthesia between November 2019 and January 2021, were recorded. Data were obtained from medical records, including demographic characteristics and information, regarding the anesthetic procedure and its associated complications. We describe our protocols for preoperative assessment, anesthetic procedures, and postanesthetic discharge evaluation.

RESULTS

Over the reporting period, 739 sessions of general anesthesia were performed. The mean number of radiation therapy rounds per patient was 23.5 sessions. Anesthetic induction was accomplished by sevoflurane inhalation in 639 sessions (86.4%) and intravenous propofol in the remaining 13.6%. General anesthesia was maintained with sevoflurane in all cases. Anesthesia-related complications occurred in 118 sessions (15.7%). The most frequent was nausea in 48 (6.4%) cases, followed by hypotension in 38 (5.1%). Airway-related complications occurred at a low frequency (2.3%), and all were resolved successfully with positive pressure ventilation. No patient hospitalizations were required because of any anesthetic complications.

CONCLUSIONS

Inhalation anesthesia is reliable and safe for pediatric patients undergoing radiation therapy.

Interdisciplinary care of children with diffuse midline glioma

Diffuse Midline Glioma (DMG) which includes Diffuse Intrinsic Pontine Glioma (DIPG) is an infiltrative tumor of the midline structures of the central nervous system that demonstrates an aggressive pattern of growth and has no known curative treatment. As these tumors progress, children experience ongoing neurological decline including inability to ambulate, swallow and communicate effectively. We propose that optimal care for patients with DMG should involve a specialized team experienced in caring for the multifaceted needs of these patients and their families. Herein we review the roles and evidence to support early involvement of a specialized interdisciplinary team and outline our views on best practices for these challenging tumors.

Improving the Pediatric Patient Experience During Radiation Therapy-A Children's Oncology Group Study

PURPOSE

Treatment with radiation therapy (RT) can cause anxiety and distress for pediatric patients and their families. Radiation oncology teams have developed strategies to reduce the negative psychological impact. This survey study aimed to characterize these methods.

METHODS AND MATERIALS

A 37-item questionnaire was sent to all radiation oncology members of the Children's Oncology Group to explore strategies to improve the pediatric patient experience. The Wilcoxon rank-sum test was used to assess factors associated with use of anesthesia for older children.

RESULTS

Surveys were completed by 106 individuals from 84/210 institutions (40%). Respondents included 89 radiation oncologists and 17 supportive staff. Sixty-one percent of centers treated ≤50 children per year. Respondents described heterogenous interventions. The median age at which most children no longer required anesthesia was 6 years (range: ≤3 years to ≥8 years). Routine anesthesia use at an older age was associated with physicians' lack of awareness of these strategies (P = .04) and <10 years of pediatric radiation oncology experience (P = .04). Fifty-two percent of respondents reported anesthesia use added >45 minutes in the radiation oncology department daily. Twenty-six percent of respondents planned to implement new strategies, with 65% focusing on video-based distraction therapy and/or augmented reality/virtual reality.

CONCLUSIONS

Many strategies are used to improve children's experience during RT. Lack of awareness of these interventions is a barrier to their implementation and is associated with increased anesthesia use. This study aims to disseminate these methods with the goal of raising awareness, facilitating implementation, and, ultimately, improving the experience of pediatric cancer patients and their caregivers.

Age-appropriate multidisciplinary approach to young children with cancer undergoing radiotherapy: The SIESTA procedure

A standardized multidisciplinary step-by-step approach to improve the compliance of young (or difficult) children having to undergo radiotherapy was described and applied. The procedure is called SIESTA, which stands for show-imagination-evaluation-support-treatment-anesthesia. Preliminary assessments suggest that the SIESTA approach was effective: the rate of young patients (≤6 years) requiring anesthesia decreased from 27% (14/52 cases) in 2011-2012 (before the procedure was adopted) to 13% (6/46) in 2018.

Psychosocial Support for Pediatric Patients at Proton Therapy Institutions

Purpose

Pediatric patients with cancer benefit significantly from psychosocial support during and after treatment, but to date, limited data exist regarding the patterns of psychosocial support provided to patients in radiation oncology departments. The purpose of this study was to assess the supportive care services provided at proton therapy institutions in the United States with a specific focus on education, parental involvement, and coping techniques.

Materials and Methods

Physicians, nurses, and child life specialists at 29 operational proton therapy facilities in the United States were sent an online questionnaire regarding pediatric treatment support. The survey consisted of 10 questions exploring strategies employed to educate and support pediatric patients before and during radiotherapy.

Results

Staff members from 23 of 29 operational proton centers (79%) in the United States completed the survey. Three centers (10%) declined to participate, and three (10%) did not complete the questionnaire. Respondents permitted parental presence for body positioning on the first day of treatment and every day of treatment if needed at 95.6% (22 of 23) and 73.9% (17 of 23) of the centers, respectively. Primary education methods included a facility tour (91.3%; 21 of 23) and psychological preparation (78.3%; 17 of 23). Physicians (82.6%; 19 of 23), nurses (73.9%; 17 of 23), and child life specialists (69.6%; 16 of 23) most commonly provided education to pediatric patients and their families. Only 21.7% (5 of 23) of the facilities reported documentation of a psychosocial support policy. Common coping techniques included music (87.0%; 20 of 23), parental presence for positioning (73.9%; 17 of 23), listening to audio recordings (73.9%; 17 of 23), aromatherapy on or near the patient (73.9%; 17 of 23), and use of a stress ball (65.2%; 15 of 23).

Conclusion

Proton therapy institutions frequently offered psychologic preparation before treatment and employed various coping strategies. Based on this survey, we propose several recommendations to raise awareness and improve the experience of pediatric patients at radiation oncology centers.

Age as a decisive factor in general anaesthesia use in paediatric proton beam therapy

Proton therapy for paediatric cancer patients is an effective treatment; however, young children have may have difficulties staying still during irradiation. This study investigated the indication of general anaesthesia in paediatric proton therapy. Background information and anaesthesia/treatment protocols were retrospectively extracted from the medical records of cancer patients under 15 years who underwent proton therapy at Southern TOHOKU General Hospital, Fukushima, Japan between April 2016 and December 2018. The anaesthesia and non-anaesthesia groups were compared to evaluate factors determining the need for general anaesthesia. Thirty-two patients who received 285 irradiations were analysed. The median age was 5 years old (range: 1–15), and 13 patients (40.6%) were female. Twelve (37.5%) patients received general anaesthesia. In the general anaesthesia group, airway management using a laryngeal mask was performed in 11 patients (91.6%). Patient age was significantly lower in the general anaesthesia group than in the non-anaesthetised group (p < 0.001). Considering all background factors, only age was strongly associated with anaesthesia in the univariate logistic regression model (odds ratio 0.55 [95% confidence interval 0.35–0.86]; P < 0.01). Thus, age is one of the most important factors determining the need for general anaesthesia during proton therapy in children.

Anaesthesia in a Toxic Environment: Pressurised Intraperitoneal Aerosol Chemotherapy: A Retrospective Analysis

OBJECTIVE

Pressurised intraperitoneal aerosol chemotherapy (PIPAC) is a new type of intraperitoneal chemotherapy for peritoneal carcinosis via minimally invasive surgery. This technique's specificity is the remote application of the therapy because of the potential risk of exposure to toxic products. The present paper summarises the important aspects of PIPAC and analyses the anaesthetic outcomes.

METHODS

This retrospective study included all patients undergoing PIPAC treatment between January 2015 and February 2018. Data on protocol adherence and perioperative anaesthetic complications and postoperative nausea and vomiting (PONV) and pain levels (visual analogue scale 0-10) from recovery room to 72 h were analysed.

RESULTS

The overall analysis included 193 PIPAC procedures on 87 patients. Protocol adherence was high as regards the use of propofol (100%), rocuronium (98%), antiemetic prophylaxis (99%) and lidocaine intravenous (i.v.) (87%). No accidental exposure to chemotherapy occurred during the study period. Of the 87 patients, 6.3% suffered delayed recovery, 58% due to hypothermia and 42% due to excessive sedation or curarisation. In the recovery room, 16% of patients suffered moderate to severe pain, requiring >8 mg of morphine i.v., with average doses of 13.7 mg. Median postoperative pain scores were 1 and 3 at 12 h and 0 and 0 at 72 h at rest and mobilisation, respectively. PONV was observed in <10% of patients during the first 12 h, but in 40% at 72 h.

CONCLUSION

A dedicated anaesthetic protocol and intraoperative safety checklist facilitates safe, well-tolerated anaesthesia for PIPAC treatments.

A Visual Analytics Dashboard to Summarize Serial Anesthesia Records in Pediatric Radiation Treatment

BACKGROUND

Young children who undergo radiation therapy may require general anesthesia to remain still during weeks of radiation sessions. On a typical day at our hospital, an anesthesia team will care for 10 patients in the radiation therapy suite, and each patient will have multiple prior anesthetic records. Daily review of prior anesthesia records is important to maintain anesthetic consistency and to identify potential improvement, yet our electronic health record (EHR) made such review time-consuming and cumbersome.

OBJECTIVES

This article aims to design a visual analytics interface that simultaneously displays data from multiple anesthesia encounters to support clinical consistency in medications and airway management.

METHODS

Documentation from the EHR is available in the clinical data warehouse following daily backups. A visual analytics interface was built to aggregate important components of multiple anesthesia encounters in pediatric radiation oncology on a single screen. The application was embedded in the EHR's anesthesia module and updated daily.

RESULTS

Each anesthesia encounter was represented by a vertical line with the date at the bottom of the screen. Each vertical line was divided into sections corresponding to the medications, type of airway device, type of radiation oncology procedure, days between treatments, and recovery score and time. Information about the medications, airways, and procedures was shown with icon legends. This layout enabled users to quickly see the key components of multiple anesthetics and make inferences between, for example, the medications used and the recovery score.

CONCLUSION

The dashboard provides a high-level summary of all radiation therapy anesthesia records for children receiving recurrent treatments. In this clinical scenario, it is desirable to replicate an optimal anesthetic approach for daily or near-daily treatments or adjust the anesthetic based on observed patterns.

Propofol-based palliative sedation in terminally ill children with solid tumors: A case series

RATIONALE

The palliative sedation therapy is defined as the intentional reduction of the alert state, using pharmacological tools. Propofol is a short-acting general anesthetic agent, widely used for induction and maintenance of general anesthesia and rarely employed in palliative care.

PATIENT CONCERNS AND DIAGNOSES

This case series describes 5 pediatric oncology inpatients affected by relapsed/refractory solid tumors received palliative sedation using propofol alone or in combination with opioids and benzodiazepines.

INTERVENTIONS AND OUTCOMES

Five terminally ill children affected by solid tumors received propofol-based palliative sedation. All patients were previously treated with opioids and some of them reduced the consumption of these drugs after propofol starting. In all cases the progressive increase of the level of sedation until the death has been the only effective measure of control of refractory symptoms related todisease progression and psychological suffering.

LESSONS

We evaluated the quality of propofol-based palliative sedation in a series of pediatric oncology patients with solid tumors at the end of their life. We concluded that propofol represents an effective and tolerable adjuvant drug for the management of intractable suffering and a practicable strategy for palliative sedation in pediatric oncology patients at the end of their life.

2018 ACC/HRS/NASCI/SCAI/SCCT Expert Consensus Document on Optimal Use of Ionizing Radiation in Cardiovascular Imaging: Best Practices for Safety and Effectiveness-A Review for the Cardiac Anesthesiologist

The American College of Cardiology, in collaboration with the American Society of Nuclear Cardiology, Heart Rhythm Society, Mended Hearts, North American Society for Cardiovascular Imaging, Society for Cardiovascular Angiography and Interventions, Society for Cardiovascular Computed Tomography, and Society of Nuclear Medicine and Molecular Imaging, recently published a consensus document recommending best practices for the use of ionizing radiation in cardiovascular medicine. With the increase in number and complexity of catheter-based cardiovascular interventions, cardiothoracic anesthesiologists are being requested to consult and provide care for these patients. This review summarizes the salient portions of the consensus document as it pertains to the anesthesiologist. Radiation exposure for both patients and providers should be minimized to be as low as reasonably achievable. For the anesthesiologist involved in the procedure, the authors recommend wearing protective garments including apron, vest, neck collar, and glasses of at least 0.25-mm lead or lead equivalent. The addition of a portable shield also is strongly recommended. The anesthesiologist should maintain the maximum distance allowable from the x-ray source, remembering that radiation intensity is inversely proportional to the square of the distance from the x-ray source. Monitoring radiation exposure is done best by both collar and under-apron film badge. A 0.5-mm lead-equivalent apron is expected to shield approximately 95% of the radiation. By using these recommendations, the anesthesiologist should be able to keep radiation exposure under 20 mSv per year as recommended by the International Commission on Radiation Protection.

An Interactive Virtual Reality Tour for Adolescents Receiving Proton Radiation Therapy: Proof-of-Concept Study

BACKGROUND

Child life therapists provide patient education for children undergoing radiation therapy to assist in coping with and understanding their treatment.

OBJECTIVE

This proof-of-concept study aimed to determine the feasibility of incorporating a 360-degree video tour via a virtual reality system for children scheduled to receive radiation therapy. The secondary objective was to qualitatively describe each subject's virtual reality experience.

METHODS

Children aged ≥13 years scheduled to receive proton radiation therapy were included in the study. Subjects watched the 360-degree video of the radiation therapy facility in an immersive virtual reality environment with a child life therapist experienced in coaching children receiving radiation therapy and completed a survey after the tour.

RESULTS

Eight subjects consented to participate in the study, and six subjects completed the 360-degree video tour and survey. All the enrolled patients completed the tour successfully. Two subjects did not complete the survey. Two subjects requested to pause the tour to ask questions about the facility. Five subjects said the tour was helpful preparation before undergoing proton radiation therapy. Subjects stated that the tour was helpful because "it showed [them] what's to come" and was helpful to see "what it's like to lay in the machine." One subject said, "it made me feel less nervous." Six subjects stated that they would like to see this type of tour available for other areas of the hospital, such as diagnostic imaging rooms. None of the subjects experienced nausea or vomiting.

CONCLUSIONS

The 360-degree video tour allowed patients to explore the treatment facility in a comfortable environment. Participants felt that the tour was beneficial and would appreciate seeing other parts of the hospital in this manner.

A systematic review of interventions to reduce psychological distress in pediatric patients receiving radiation therapy

OBJECTIVE

Radiation therapy (RT) is a cornerstone for management of pediatric cancer. For younger patients, unintended radiation to critical organs is a concern and children need to remain immobile. Distress in children is common so many centres sedate pediatric patients. Children often are unable to remain still, due to anxiety. Interventions to reduce distress could also reduce sedation rates. The objectives of this systematic review were to: review the interventions used to address pediatric RT patients' distress and anxiety and assess their effectiveness.

METHODS

A systematic search of qualitative and quantitative studies from 1996 to 2016 was conducted using PRISMA guidelines. Nine articles were identified for inclusion in the final review. These articles were reviewed using a quality rating.

RESULTS

Participants included patients 19 years of age or younger, parents and RTs. All were single-site studies. Five studies had a control group, 3 studies had no control group, and 1 study was qualitative. Quality was not high. Six studies reported significant effects. Only one study reported group differences in children's reported anxiety.

CONCLUSION

Cognitive behavioural approaches appear to be worth exploring further, as are approaches grounded in child development. Therapeutic play, particularly procedural preparation via play, also seems to be a useful starting point.

Propofol-based balanced anesthesia is safer in pediatric radiotherapy

Backround and purpose

To investigate the incidence of complications related to propofol-based anesthesia and the factors associated with complications in children with radiotherapy.

Materials and methods

Patients who underwent anesthesia for external beam radiotherapy between May 2013 and November 2017 were included in the study. We assessed the age/weight, sex, oncologic diagnosis, type of radiotherapy procedure, duration of anesthesia, applied agents, and complications related to anesthesia. Complications were evaluated between group I (only propofol group) and group II (propofol plus adjuvant drugs) as respiratory and cardiac.

Results

In 130 patients, sedation was given for 1376 radiotherapy procedures. Of these, 1274 (1140 radiation treatment sessions and 134 computed tomography simulations) in 126 patients were propofol-based and were included in the analysis. Although respiratory complications are the most common in both groups, there were no episodes of laryngospasm, broncospasm, and no use of advanced airway intervention. The rate of complication was significantly higher in only propofol anesthesia group than in patients treated with propofol plus adjuvant drugs. In the multivariate analysis, we found three factors that were significantly associated with the risk of complications: total dose of propofol (mg/kg) (p < 0.001), anesthesia with propofol alone (as compared to propofol plus adjunct agents) (p = 0.001), and diagnosis of neuroblastoma (as compared to other diagnosis) (p = 0.043).

Conclusion

Propofol-based anesthesia is preferred in order to minimize the rate of complications in radiotherapy anesthesia applications. The use of non-opioid adjuvants in combination with propofol to achieve a balanced anesthesia will also reduce the complications that may be encountered.

Incidence of tolerance in children undergoing repeated administration of propofol for proton radiation therapy: a retrospective study

Background

Propofol is an excellent hypnotic drug for use in repeated radiation procedures in young children. To date, tolerance to propofol generally does not develop in pediatric patients undergoing radiation therapy. However, several studies have suggested that there may be potential for development of tolerance to propofol. The aim of this study was to evaluate the development of a tolerance to propofol used for repeated deep sedation in children undergoing proton radiation therapy (PRT).

Methods

All children undergoing PRT at our institution between December 2015 and January 2018 were eligible for inclusion in this study. Sedation was induced by a bolus dose of propofol (2.0 mg.kg^− 1) followed by a continuous infusion of 250 μg.kg^− 1.min^− 1 via an infusion pump to achieve deep sedation. Sedation was maintained with the propofol infusion of 200 μg.kg^− 1.min^− 1, which was adjusted in 25 μg.kg^− 1.min^− 1 increments up or down as necessary to ensure deep sedation. The primary outcome was mean doses of propofol over time.

Results

Fifty-eight children were analyzed. The mean (SD) age was 4.5 (2.1) years. The mean (SD) number of treatment sessions was 19 (7). Fifteen patients (26%) developed tolerance to propofol. However, there were no significant differences between the children who developed tolerance and the children who did not develop tolerance in mean propofol dose and awakening time over time (p = 0.887 and P = 0.652, respectively). Age, the number of PRT, and attending anesthesiologists was not significantly associated with the incidence of tolerance to propofol.

Conclusion

Repeated prolonged deep sedation for PRT elicited multiple times over several weeks in young children using propofol did not develop tolerance in 74% of patients. Although the incidence of 26% tolerance to propofol may still be present, the increase in propofol dose was minimal. Therefore, the use of repeated propofol for children was safe.

Anesthesia Practice in Pediatric Radiation Oncology: Mayo Clinic Arizona's Experience 2014-2016

OBJECTIVE

Understanding the goals of targeted radiation therapy in pediatrics is critical to developing high quality and safe anesthetic plans in this patient population. An ideal anesthetic plan includes allaying anxiety and achieving optimal immobilization, while ensuring rapid and efficient recovery.

METHODS

We conducted a retrospective chart review of children receiving anesthesia for radiation oncology procedures from 1/1/2014 to 7/31/2016. No anesthetics were excluded from the analysis. The electronic anesthesia records were analyzed for perianesthetic complications along with efficiency data. To compare our results to past and current data, we identified relevant medical literature covering a period from 1984-2017.

RESULTS

A total of 997 anesthetic procedures were delivered in 58 unique patients. The vast majority of anesthetics were single-agent anesthesia with propofol. The average duration of radiation treatment was 13.24 min. The average duration of anesthesia was 37.81 min, and the average duration to meet discharge criteria in the recovery room was 29.50 min. There were seven instances of perianesthetic complications (0.7%) and no complications noted for the 80 CT simulations. Two of the seven complications occurred in patients receiving total body irradiation.

DISCUSSION

The 5-year survival rate for pediatric cancers has improved greatly in part due to more effective and targeted radiation therapy. Providing an anesthetic with minimal complications is critical for successful daily radiation treatment. The results of our data analysis corroborate other contemporary studies showing minimal risk to patients undergoing radiation therapy under general anesthesia with propofol.

CONCLUSION

Our data reveal that single-agent anesthesia with propofol administered by a dedicated anesthesia team is safe and efficient and should be considered for patients requiring multiple radiation treatments under anesthesia.

Dexmedetomidine for sedation in pediatric patients who received more than 20 sessions of radiation therapy: two cases report

Dexmedetomidine is a highly selective α₂-adrenoceptor agonist that demonstrates anxiolytic and analgesic properties without inducing respiratory compromise, which makes it a suitable agent for procedural sedation and imaging studies. In our current case reports, intravenous dexmedetomidine infusion was used to provide sedation to 2 pediatric patients over more than 20 sessions of radiation therapy. On both occasions, dexmedetomidine provided adequate sedation without respiratory depression. However, the required dosage increased with repeated radiation therapy sessions.

Anesthesia complications of pediatric radiation therapy

PURPOSE

Complications of anesthesia for pediatric radiation therapy are imperative for both radiation oncologists and anesthesiologists to clinically assess and manage. We performed the first systematic review to date addressing this important issue.

METHODS

A systematic search of PubMed and EMBASE was conducted using Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Searches were not restricted based on publication date. Nine original investigations were identified, analyzed, and collated for this report.

RESULTS

General anesthesia has proven superior to conscious sedation with regard to maintaining satisfactory procedural sedation while maintaining low respiratory and cardiovascular complication rates. Although agents such as ketamine (complication rates approaching 23%-24%) have been used in the past, other agents such as propofol and volatile anesthetics have lower complication rates because of improved drug side effect profiles (0.01%-3.5%). Most common complications are respiratory-based (eg, airway obstruction, broncho/laryngospasm, desaturation, apnea), followed by those that are cardiovascular-based (eg, tachy/bradycardia, arrhythmias, hypotension) and nausea/vomiting. Though procedure duration and anesthetic dose can be associated with higher complication risks, prior or concurrent chemotherapy does not confer added risks other than neutropenia-related sepsis. Other potential complications include those with vascular access devices, observed in up to 20% to 25%, with peripherally inserted central catheters having the highest rates of vascular complications and port catheters the lowest.

CONCLUSIONS

Rates of anesthetic complications encountered in pediatric radiation therapy are similar, if not lower, than rates reported in controlled operating room settings, implying that anesthesia for pediatric radiation therapy is safe, with low complication rates periprocedurally. Propofol infusion and oxygen delivery via nasal cannula offer the lowest immediate anesthetic complication rates and are hence most recommended for use. Though the long-term neurocognitive consequences of multiple anesthetics in pediatric patients have yet to be clearly defined, health care providers should be cognizant of the potentially serious implications.

Non-invasive anesthesia for children undergoing proton radiation therapy

BACKGROUND

Proton therapy is a newer modality of radiotherapy during which anesthesiologists face specific challenges related to the setup and duration of treatment sessions.

PURPOSE

Describe our anesthesia practice for children treated in a standalone proton therapy center, and report on complications encountered during anesthesia.

MATERIALS AND METHODS

A retrospective review of anesthetic records for patients ⩽18years of age treated with proton therapy at our institution between January 2006 and April 2013 was performed.

RESULTS

A total of 9328 anesthetics were administered to 340 children with a median age of 3.6years (range, 0.4-14.2). The median daily anesthesia time was 47min (range, 15-79). The average time between start of anesthesia to the start of radiotherapy was 7.2min (range, 1-83min). All patients received Total Intravenous Anesthesia (TIVA) with spontaneous ventilation, with 96.7% receiving supplemental oxygen by non-invasive methods. None required daily endotracheal intubation. Two episodes of bradycardia, and one episode each of; seizure, laryngospasm and bronchospasm were identified for a cumulative incidence of 0.05%.

CONCLUSIONS

In this large series of children undergoing proton therapy at a freestanding center, TIVA without daily endotracheal intubation provided a safe, efficient, and less invasive option of anesthetic care.

Proteomic profiling of the phosphoproteins in the rat thalamus, hippocampus and frontal lobe after propofol anesthesia

Background

Propofol is a safe and effective intravenous anesthetic that is widely used for the induction and maintenance of anesthesia during surgery. However, the mechanism by which propofol exerts its anesthetic effect remains unknown. The rapid onset of phosphorylation modifications coincides with that of propofol anesthesia.

Methods

Propofol-anesthetized rat models were built and phosphorylated proteins in the thalamus, hippocampus and frontal lobe were enriched the to analyze the changes in these phosphoproteins after propofol anesthesia.

Results

Sixteen of these phosphoprotein spots were successfully identified using MALDI-TOF MS and a subsequent comparative sequence search in the Mascot database. Of these proteins, keratin 18 and the tubulin 2c chain are cytoskeletal proteins; keratin 18 and gelsolin are relevant to alcohol drowsiness. Based on Western blot analysis, we also confirmed that the phosphorylation of these proteins is directly induced by propofol, indicating that propofol anesthesia may be relevant to cytoskeletal proteins and alcohol drowsiness.

Conclusions

These identified propofol-induced phosphorylations of proteins provide meaningful contributions for further studying the anesthetic mechanism of propofol.