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J. Pediatr. (Rio J.) vol.87 no.4 Porto Alegre July/Aug. 2011
Evaluation of rapid sequence intubation in the pediatric emergency department
Graziela A. SukysI; Cláudio SchvartsmanII; Amélia G. ReisII
IMestre, Pediatria. Instituto da Criança,
Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo (USP),
São Paulo, SP, Brazil
IIDoutor(a), Pediatria. Instituto da Criança, Hospital das Clínicas, Faculdade de Medicina, USP, São Paulo, SP, Brazil
OBJECTIVES: To describe the experience of the emergency department of a pediatric hospital with rapid sequence intubation (RSI) and to identify the factors associated with successful intubation.
METHODS: This prospective, observational, cross-sectional study conducted from July 2005 to December 2007 consisted of collection of data regarding tracheal intubations performed at the emergency department of Instituto da Criança of Hospital das Clínicas, School of Medicine, Universidade de São Paulo. Successful tracheal intubations were the ones performed at the first attempt.
RESULTS: One-hundred and seventeen tracheal intubations were performed; 80% of them were RSIs; 79% of patients had underlying diseases; acute respiratory failure was the cause of tracheal intubation in 40%; success rate was 39%; second-year pediatric resident physicians were responsible for 74% of tracheal intubations; positive pressure ventilation was performed in 74% of procedures, with less frequent use among patients who were successfully intubated (p = 0.002). Midazolam was the sedative used in 80% of procedures, and rocuronium was the neuromuscular blocker in 100%; complications of RSI were described in 80% of intubations, with decreased oxygen saturation being reported in 47% and lower decrease in those patients successfully intubated (p < 0.001); difficulties related to tracheal intubation were less frequent in the successful procedures (p < 0.001).
CONCLUSION: RSI is the method of choice for tracheal intubations performed in the emergency department (80%). In spite of the low success rate (39%) in the present study, RSI has proven to be a safe method, with a low incidence of severe complications. The success of tracheal intubation using RSI seems to be directly related to the preparation of the procedure and the health professional's experience. Thus, we conclude that further training of resident physicians and health professionals working in the emergency department is required.
Keywords: Intratracheal intubation, intubation methods, adverse effects of intubation, neuromuscular blockers, emergency treatment, child, laryngoscopy, trachea.
Several clinical situations require tracheal intubation (TI), and airway management is a major concern and certainly one of the most critical aspects of the care provided to critically ill patients in the emergency departments.1-3
In patients requiring emergency TI, there is a combination of potential complications caused by the procedure and the factors related to the disease, which increases the risk of adverse reactions to the procedure and further complications. A higher number of TI attempts is responsible for increased complications, and most TI complications in the emergency department can be attributed to the lack of experience and training of the physician who performs the procedure.4,5
Rapid sequence intubation (RSI) consists of the performance of the TI procedure using an organized approach, which involves the use of sedatives and neuromuscular blocking agents (NMBs).6 Such procedure has been reported to be safe and effective and decreases the number of complications caused by conventional TI.6-8
RSI offers the great advantage of eliminating the resistance to direct laryngoscopy, promoting rapid induction of anesthesia, rapid occurrence of optimal conditions that facilitate direct laryngoscopy, and reduction of the risk of pulmonary aspiration2,6; therefore, RSI is appropriate for patients who require emergency TI.7,9,10
RSI indications are the same as those of emergency TI.2,6 The procedure-related risks are not negligible, and drug side effects and difficulty with airway management are the major issues to consider.11,12 RSI has been performed in emergency TI in the last two decades in the United States and it has proven to be safe and effective, becoming the method of choice in the main emergency departments.13-15
RSI has recently started to be used in children in Brazil. Its use started after the release of the 2000 Guidelines for Pediatric Advanced Life Support of the International Liaison Committee on Resuscitation, which occurred in 2002.11 The studies published so far have demonstrated low frequency of RSI in Brazil.16-18
The objectives of the present study were to evaluate the performance of RSI in children in an emergency department and to analyze the compliance with the RSI protocol as well as the variables associated with successful TIs.
We conducted a prospective, observational, cross-sectional study from July 2005 to December 2007 at the emergency department of Instituto da Criança (ICr) of Hospital das Clínicas, School of Medicine of Universidade de São Paulo, Brazil.
Data were collected on emergency TI performed in children and adolescents aged from 1 day of life to 18 years. In the present study, we included the TI procedures with the use of RSI.
The RSI flowchart used in the present study was based on flowcharts recommended by international and national medical associations.11 It was adapted for the emergency department of ICr (Figure 1). The physicians involved in the treatment had complete freedom in selecting and administering the drugs. Only the cases that followed the steps described in the proposed flowchart were considered RSI.
A form created for the present study was used to collect data from the RSI flowchart and from the record of the main complications reported in the National Emergency Airway Registry (NEAR). A resident physician filled out this form at the procedure. If the TI form was incomplete or contained divergent data, an interview with the assistant physician in charge was conducted. In order to ensure the quality of information, an active daily search of the cases through phone interviews or in person with the nurses, and resident and assistant physicians was made; as well as a search on the emergency department logbook where all complications and advanced procedures of the department are routinely recorded.
TI performed and confirmed at the first attempt of passage of the tube through the airway was considered successful.
The Statistical Package for the Social Sciences (SPSS) 13.0 was used for the statistical analysis. A p-value < 0.05 was considered statistically significant; all statistical tests were two-tailed.
The characteristics of the study population are described in Table 1 and Figure 2. Of the 94 patients included in our study, 37 (39%) underwent successful RSI, i.e., performed and confirmed at the first attempt to pass the tube through the airway.
Patients who underwent successful TI using RSI were younger than those patients whose procedure failed (median age in years: 1.2 vs. 5.4; U = 658, p = 0.002). The frequency of success in cancer patients was lower than in patients without cancer (p = 0.048). There was no significant difference in the success rate in terms of other underlying diseases and TI causes (p = 0.748).
In 70 (74%) patients, positive pressure ventilation (PPV) was used, and 38% received PPV in the pre-oxygenation phase. The proportion of patients who used PPV was significantly lower among those patients who underwent successful TI: of 37 patients who underwent successful TI procedure, 21 (56%) received PPV, and of 57 patients whose TI procedure failed, 49 (86%) received PPV (p = 0.002).
In terms of medications used, the groups were similar. In the pre-medication phase, atropine was used in 47 patients, accounting for 50% of the RSI. Midazolam was the sedative of choice, being administered to 75 (80%) patients as the only sedative or in combination. The other sedatives of choice were: ketamine, used in 28 (30%) patients; thiopental, in 16 (17%); and propofol in two (2%). Rocuronium was the NMB administered in 100% of the RSI procedures.
The number of TI attempts using RSI ranged from one to eight (median = 2). In 82 (87%) procedures, at most three attempts were made for TI confirmation. In 70 (74%) patients, TI was performed by the second-year pediatric resident physician (R2); in 13% by the assistant physician; in 8% by the third-year pediatric resident physician; and in 2%, by emergency medicine resident physicians.
The R2 performed the TI at the first attempt in 35 out of 92 patients, which represents a success rate of 38%.
Complications caused by the TI procedure were reported in 75 (80%) patients. A decreased oxygen saturation (O2) was recorded in 47% of cases, being the most prevalent complication. Table 2 shows the complications according to the success of the TI procedure. Successful TIs showed significantly fewer complications (p < 0.001). The decrease in O2 saturation, the main complication reported, was lower in the group with successful TI (p = 0.002). Difficulties related to the TI procedure using RSI were described in 44 (47%) cases, and the presence of secretion in the airways (39%), use of inadequate equipment (25%), altered anatomy (16%), and bleeding (5 %) were the main difficulties mentioned. In successfully performed TIs, the number of difficulties concerning the procedure was significantly lower than in the one that failed (two vs. 42, p <0.001).
The need for TI in the emergency departments in the United States is estimated at two to 10 per 1,000 visits of children and adults, including trauma.7,8,19 In the present study, the intubation rate (1:1.000) can be considered high, since the emergency department studied is exclusively a pediatric emergency department and no polytrauma patients are treated there, which can reflect the high complexity and severity of the cases.
The prevalence of intubation with RSI is certainly a consequence of the implementation of the treatment protocol and previous training of the medical team in the procedure and it is similar to the rate of RSI of international studies conducted in recent decades.6,8,20,21 RSI has recently started to be used in children outside the surgery room2,6,11 and, in Brazil, its use started with the Training Program in Pediatric Advanced Support Life of the American Heart Association and American Academy of Pediatrics in 2002.
The prevalence of underlying disease in the present study makes it unique, and our results are difficult to compare with the literature. Patients with severe diseases are usually at higher risk while undergoing emergency invasive procedures and using medications.8,12,21,22
The immediate condition that prompted the use of RSI was acute respiratory failure alone and in combination with other causes. Other studies have found lower rates of respiratory failure as the immediate cause of TI.8,21,23,24 The indication for TI in cases with exclusive respiratory impairment depends on the clinical interpretation and different definitions adopted, which routinely are not well defined in the studies.
A larger number of TI attempts is directly associated with increased morbidity and progressive difficulty to access the airway.4
It should be noted that intubations performed in the emergency department are elective and carried out in stressful and uncontrolled situations. Standardization of care protocols, such as the RSI, aim to make this procedure safer and improve the success rate of TI.
Data were collected at the beginning of the introduction of the RSI protocol, and as shown by Simpson et al. and Sagarin et al., current data should better reflect the subjective perception of improvement in the quality of the procedure.21,22
U.S. studies conducted at university hospitals have revealed success rates of TI in emergency departments up to 78%.8,21 In the present study, we found a success rate of 39% in all procedures and 38% in those performed by R2 (79% of TIs); though this rate seems low compared with the literature data, we should be careful, since the levels of training are different between departments. Sagarin et al.21 report that only 10% of the TIs performed at their department were done by R2, with a success rate of 50%.
The success of intubation and the complications associated with it are related to the performance of laryngoscopy, a procedure that requires high level of training and experience.1 At ICR, TIs are performed by professionals under training, with low level of experience, supervised by the assistant physician, which contributes to a lower success rate and higher number of reports of complications when compared with specialized medical departments in the United States. No data were found in the national literature that allow comparative analysis.
Despite the low success rate, all patients in the study were submitted to TI in the emergency department without aid of anesthesia, endoscopy, or surgical airway, which shows that the team is allowed in the management and airway control in emergency situations.
While reviewing the RSI procedure, we found that all patients received preoxygenation, but the recommendation is to use PPV during pre-oxygenation only in specific situations for example in cases of apnea6 such recommendation apparently was not adopted.
It is assumed that the PPV is associated with increased complications and lower TI success rate because it causes gastric distension and risk of pulmonary aspiration. PPV was widely used and was directly associated with the procedure failure (p = 0.002). The excessive use of PPV may have been associated with increased severity of the patients' health status or failure to understand the term oxygenation. Although the medications used in the RSI were suggested in the flowchart of the RSI care protocol, the assistant physicians who supervised the procedure were free to choose the medications both in the premedication phase and in the sedation and analgesia phase. There was no difference in the use of medications in the successful and unsuccessful groups, since the drugs were chosen based on the underlying disease and the TI cause.
The sedatives and NMB used in the RSI procedure differ in different emergency departments, which makes it difficult to perform a comparative analysis. In an emergency care protocol, it is essential that the health professionals know the pharmacodynamics of the agents used and thus are familiar with their action and adverse effects.
In the pre-medication phase, atropine has specific indications in airway management in infants and children to prevent bradycardia caused by direct laryngoscopy and passage of the tracheal tube. Pre-medication was used according the guidelines of the American College of Pediatricians and American Academy of Pediatrics.24
The ideal sedative to be in the RSI procedure is one that promotes unconsciousness quickly, with a short duration and action and minimal side effects. Such characteristics can be found in several medications.25-27 Midazolam, alone or in combination, was the most commonly used sedative. Midazolam is a fast-acting benzodiazepine with anticonvulsant and amnesic property, which makes it a suitable sedative in RSI, although other sedatives are also appropriate.6,11 There is a lot of controversy about the use of sedative agents in critically ill patients.25
The use of paralytic agents is the cause of major discussion and a deadlock at the moment of intubation. Rocuronium was the NMB used in 100% of the procedures described in the present study. This practice proved to be safe and effective. The main NMB described in the literature and used in RSI is succinylcholine, although in more recent studies other agents have been recommended.28-30 Side effects of succinylcholine, such as hyperkalemia, bradycardia and cardiac arrest, are more common in children, which explains why it is not used in the protocol of the present study.24 Recent studies have shown that succinylcholine offers optimal conditions for TI in a faster and easier manner than rocuronium; however, both NMBs promote acceptable clinical conditions for the performance of TI.31 Recent research has brought sugammadex to market, which is a reversal agent of rocuronium. Reversal offers the possibility of using deep relaxation in elective or emergency TI without the risk of clinically important cardiovascular effects because there is no interaction of this drug with the cholinergic system.32 This breakthrough is a milestone in the use of anesthesia and NMBs in the emergency departments, offering more comfort and easiness to the medical team regarding the management of these drugs.
There was a high rate of complications reported in the TI procedure (80%) compared with the literature,8,21,22 where the rate of complications reported with the use of RSI is between 8 and 15%, with hypoxemia being the most frequent complication. The comparison between studies is severely hampered because the definitions of what is considered a complication or effect inherent to the procedure vary greatly.
Although the occurrence of decreased O2 saturation (47%) and bradycardia (14%) is a cause of concern, these conditions did not contribute to clinical deterioration and were reversed without the need for cardiopulmonary resuscitation. In the successful TIs, the rate of complications was significantly lower (p < 0.001). Several TI attempts are related to increased complications and procedure failure.13,15,33
The presence of secretion in the airways was the main difficulty related to the TI procedure, followed by the use of inadequate equipment and anatomical difficulties. It is estimated that these difficulties could be correctable with the proper preparation and choice of material, as well as with better trained health professionals.
The adherence to the RSI protocol seemed to increase over the 30 months analyzed. Familiarity with the effects of medications, adverse effects of drugs, and TI preparation was quickly implemented in the emergency department. It should be noted that to achieve standardized and formal records of invasive and risky procedures in the emergency department is a difficult goal, and the small number of studies conducted in emergency departments shows that the quality of information in an uncontrolled environment is erratic and requires discipline.
The present study was conducted in a university emergency department, where the medical team comprises professionals who are being trained by experienced physicians in emergency care, and the population studied was seen at a tertiary hospital, where most children present with preexisting severe illness. Thus, this sample cannot be extended to hospitals with different characteristics, and the data presented here should not be rigidly applied to other health care facilities.
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Correspondence: Manuscript submitted May 18, 2010, accepted for
publication May 11, 2011. No conflicts of interest declared concerning
the publication of this article.
Graziela de Almeida Sukys
Av. Zelina, 700 - Vila Zelina
CEP 03143-001 São Paulo, SP - Brazil
Tel.: +55 (11) 8346.5535, +55 (11) 2341.9456
Suggested citation: Sukys GA, Schvartsman C, Reis AG. Evaluation of rapid sequence intubation in the pediatric emergency department. J Pediatr (Rio J). 2011;87(4):343-9.
Manuscript submitted May 18, 2010, accepted for publication May 11, 2011.
No conflicts of interest declared concerning
the publication of this article.