Safety of procedural sedation and analgesia in children less than 2 years of age in a pediatric emergency department
© Springer-Verlag London Ltd 2008
Received: 13 June 2008
Accepted: 18 July 2008
Published: 20 September 2008
Although young age is considered a risk factor for adverse events related to procedural sedation and analgesia (PSA), data in very young children (<2 years of age) are lacking.
The main objective of our study is to describe PSA in children <2 years of age in an inner city tertiary care pediatric emergency department (PED).
We conducted a retrospective chart review from January 2005 to June 2007 of children <2 years of age who received PSA in our PED. We collected demographic variables, indication for and medications used for PSA, adverse events (AE) related to PSA, and interventions performed to treat them.
Of the children who received PSA, 14.5% (180/1,235) were <2 years of age of whom 173 were included for the analysis; 73% (126/173) of the study subjects were between 1 and 2 years of age, 54.3% (94/173) were male, and 96.5% (167/173) belonged to American Society of Anesthesiologists class 1. Incision and drainage (45.0%, 78/173) and laceration repair (32.4%, 56/173) were the two most common indications for PSA. Ketamine and midazolam was the most common combination medication used for PSA (62.4%, 108/173). Sedation was deemed ineffective in 5.8% (10/173) of the children. There were only two failed sedations; 5.8% (10/173) of the children experienced AE with most being minor [oxygen desaturations 1.7% (3/173), emesis 2.3% (4/173), and others 1.2% (2/173)]. One child experienced serious AE in the form of apnea and bradycardia requiring intubation.
Our data suggest that children under 2 years of age can be sedated effectively without increased risk of AE in a PED.
KeywordsPediatric Procedural sedation Conscious sedation Analgesia Adverse events
Providing relief from pain and anxiety associated with diagnostic and therapeutic procedures has become an ethical imperative in children as well as a measured quality indicator from the family’s perspective. This, along with a tremendous increase in the number of procedures performed on children outside the operating room, has led to non-anesthesiologists, particularly emergency physicians, taking a key role in the administration of procedural sedation and analgesia (PSA) to children. It has been estimated that roughly a quarter million children will receive PSA in the emergency departments (EDs) annually and that children under 2 years of age constitute roughly 20–30% of those [1, 2]. It has been shown that pain in infants and toddlers is poorly recognized and documented [3, 4], predisposing them to receive less analgesia when compared with older children . Commonly used medications for PSA such as ketamine are relatively contraindicated in very young children (<6 months of age) because of an association with increased risk of airway complications . Inadequate sedation and analgesia predisposes to procedural failure, parental anxiety and dissatisfaction, and poor quality of care. The anatomic differences in the airway like smaller airway diameter, longer and floppy epiglottis, and the physiologic differences in drug metabolism between younger and older children could predispose younger children to a higher risk for adverse events related to sedation. Studies have shown contrasting results regarding association of age and adverse events related to PSA. While some studies have found children less than 2 years of age to be at an increased risk for adverse events related to PSA [7, 8], other studies have found no association between age and adverse events related to PSA [9, 10]. To our knowledge, there have been no studies that have focused exclusively on PSA in children less than 2 years of age. The main objective of our study is to describe PSA in children less than 2 years of age in the ED of a tertiary care children’s hospital. Additionally, we will describe the indications for PSA, medications used, efficacy of sedation, and adverse events related to sedation in this group of children.
We conducted a retrospective chart review of medical records, including sedation records of all children less than 2 years of age who underwent PSA in our ED over a period of 2.5 years from January 2005 to June 2007. Our ED is a level 1 trauma center of a tertiary care, freestanding children’s hospital with greater than 90,000 visits a year. Study subjects were identified using their date of birth and the Current Procedural Terminology (CPT) code used for procedural sedation in the ED (99141). All patients who undergo PSA in the ED have a standardized nursing sheet that records all events during the PSA procedure till discharge from the ED. Children who received only pain medication, or analgesia, and those who underwent sedation in the imaging department by the sedation team were excluded from the study.
We used a standardized data abstraction sheet to collect patient demographic variables, past medical history including American Society of Anesthesiologists (ASA) class, indications and medications used for PSA, and service of the physician (for example ED attending or consultant services like pediatric surgery, hand surgery, etc.) performing the procedure. We collected data on effectiveness of sedation, adverse events related to sedation, the interventions performed to overcome the adverse events, and ED disposition. For the purposes of the study, the following were considered as adverse events: oxygen desaturations less than 93% for greater than 15 s, apnea, aspiration, laryngospasm, bradycardia, hypotension, paradoxical reaction, emesis, and any other that were reported by the sedating physician as an adverse event. Sedation was deemed as inadequate if the procedure was completed but with significant patient distress as documented in the nursing notes or movement during the procedure. Failed sedation was defined as the inability to complete the procedure in the ED. All data were abstracted and entered by the principal investigator to maintain consistency. All data were double entered for accuracy. This study was approved by the Institutional Review Board.
Statistical analysis was conducted using the commercial software SAS v. 9.1 (SAS Institute Inc., Cary, NC, USA). Descriptive statistics (frequency, mean, standard deviation, and 95% confidence interval) was used to summarize the characteristics of the study sample. The chi-square test and Student’s t-test were used to compare the differences in the number of medications used and medication dosages between patients with adequate sedation versus those with inadequate sedation.
Comparison of children with adequate versus inadequate sedation
No. of medication(s) received
Two or more
Adverse events related to procedural sedation and analgesia
Medication dose (mg/kg)
Incision & drainage
Airway repositioning, racemic epinephrine
Incision & drainage
Incision & drainage
One study subject experienced a serious adverse event, in the form of apnea and bradycardia, which required intubation. This was a 2-month-old male child with a history of recent upper respiratory tract infection and an overnight admission for bronchiolitis 1 week prior to the visit that required PSA. He required PSA for an incarcerated right-sided inguinal hernia. He received two doses of ketamine (total of 2 mg/kg) and two doses of midazolam (total of 0.2 mg/kg). Approximately 30 min after the failed reduction he developed persistent hypoxia and bradycardia which did not respond to supplemental oxygen or airway maneuvers and subsequently became apneic requiring endotracheal intubation. He was extubated 2 days later and had an uncomplicated recovery.
Our study results suggest that PSA is safe and can be performed successfully in children less than 2 years of age. These results are consistent with previous studies which have demonstrated the proficiency of emergency medicine physicians to deliver PSA effectively in children of all age groups [9, 11, 12]. There were only two failed sedations in our study. Both our “failed sedations” occurred in the youngest age group (<6 months of age), were procedure failures, and occurred during hernia reduction. This may underscore the need for reduction in the operating room rather than in the emergency department for the youngest children.
Interestingly, abscess incision and drainage was the most common indication for PSA in our study population. Other studies have reported that fracture reduction and laceration repair are more common indications [9, 12], and the difference in indications could be reflective of our study population or could reflect the reported increase in the ED visits for skin and soft tissue infections secondary to the emergence of community-acquired methicillin-resistant Staphylococcus aureus .
Our study demonstrates a low adverse event rate related to PSA in children less than 2 years of age. More importantly, most of the observed adverse events were minor and transient requiring only minimal intervention. Malviya et al.  in their study of adverse events related to sedation of children by non-anesthesiologists concluded that young age (less than 1 year of age) was a predictor of adverse events. However, the majority of patients in their study underwent sedation for diagnostic imaging and three fourths of the children were sedated with chloral hydrate, a drug that is not commonly used for PSA in the emergency department. Although Peña et al.  in their prospective study of adverse events related to PSA in a pediatric emergency department reported that one third of the observed total adverse events occurred in children up to 2 years of age, in their final analysis they were unable to find a difference between those who experienced adverse events and those who did not, with respect to age.
We did have one serious adverse event related to PSA in our study. This patient serves to highlight that safety of PSA is dependent on patient characteristics and that adequate monitoring is essential during and after the procedure until the patient is ready for discharge. It also emphasizes the need for physicians providing PSA to have necessary skills to rescue the patient from a deeper level of sedation than that intended for the procedure and provide appropriate cardiopulmonary support if needed .
The biggest limitation to our study was its retrospective nature, which could have limited the amount of information that was available. We reviewed not only the medical records of the study children but also the sedation records. The sedation records were audited every 3 months during the study period to ensure completeness of data recorded in these records. There could have also been variation amongst physicians and nurses as to what constitutes an adverse event related to PSA leading to overreporting or underreporting of the adverse event rate. But this under/overreporting is less likely because of a standardized monitoring plan for all patients undergoing PSA in the ED. We also did not study the adverse events after discharge from the emergency department. This study was undertaken at a tertiary care pediatric emergency department and the findings may not be applicable to other settings with different levels of training of the sedation providers and different monitoring practices. Our center also uses ketamine predominantly for PSA. The adverse event rate and profile may be different in other centers which use other medications for PSA.
Our study shows that PSA can be administered effectively and safely with few adverse events to children less than 2 years of age in a pediatric emergency department.
Conflicts of interest
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