Tracheal intubation in children after induction of anesthesia with propofol and remifentanil without a muscle relaxant
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1 Original Article Tracheal intubation in children after induction of anesthesia with propofol and remifentanil without a muscle relaxant Mirmohammad Taghi Mortazavi, 1 Masood Parish, 1 Naghi Abedini, 2 Ramin Baradaran, 2 Ghafour Abafattash, 2 Maarouf Ansari 3 Department of anesthesiology, Tabriz University of Medical Sciences, Tabriz, Iran ABSTRACT Objectives To determine the suitable and ideal doses of remifentanil which provide tracheal intubating conditions in children given propofol. Methods This prospective double blind trial was performed on 6 ASA 1 and 2 children aged between 3 and 12 years at Nikokari University Hospital, Tabriz, Iran from June 27 to April 28. The patients were randomly allocated to one of four groups. Patients in groups 1, 2, 3, and 4 received 1, 2, 3µg/kg remifentanil; and.5mg/kg atracurium, respectively. Then, all patients were injected 3 mg/kg of propofol, and underwent tracheal intubation. The intubating conditions were evaluated and recorded according to the Helbo-Hansen scoring system. Results Tracheal intubation was successful in 58 of 6 patients. Intubation failed only in two patients of group 1, but was performed after injection of additional drug. The difference of total conditions of tracheal intubation between groups 1 and 4 was significant (33% vs. 8%); the difference of total conditions between groups 3 and 4 was not significant (P=.427); but the difference of total conditions between 4 groups was significant (P=.43). Conclusion Intubating conditions in children following administration of remifentanil 3 µg/kg were more suitable who were given propofol. (Rawal Med J 21;35: ). Keywords Propofol, remifentanil, tracheal intubation, pediatric. INTRODUCTION 1
2 Tracheal intubation can be achieved by direct laryngoscopy following deep inhalational anesthesia or an intravenous anesthetic and a muscle relaxant. 1 The use of Neuromuscular blocking drugs, particularly suxamethonium, for laryngoscopy and tracheal intubation remains the mainstay of day to day anesthetic practice, however, it is associated with significant side effects. 2,3 The use of -depolarizing relaxants decrease the speed of anesthesia establishment and achievement of facility for tracheal intubation require higher doses of these drugs, which may not be compatible with short surgical procedures. Atracurium is a depolarizing neuromuscular blocking drugs that produces an onset of action of 3 to 5 minutes and a duration of 2 to 35 minutes. 4 The usage of combined Propofol and alfentanil reliably facilitates intubation without the use of neuromuscular blocking agents. 1,3-6 Remifentanil hydrochloride, an ultra short acting opioid, undergoes rapid metabolism by tissue and plasma esterases. 1 The speed of the onset of effect is rapid (1-2 min) and similar to that of alfentanil 3 and the elimination half time is hr. 4 Thus, remifentanil is the ideal opioid to facilitate tracheal intubation and allows a rapid return of spontaneous respiration and airway reflexes. 3,5,6 However, there is controversy on doses of remifentanil needed for tracheal intubation. 6 The aim of this study was to determine the suitable and ideal dose of remifentanil which provides tracheal intubating conditions in children with propofol - induced anesthesia. PATIENTS AND METHODS Following Ethical Committee approval and written parental, informed consent, we included 6 ASA 1 and 2 patients, aged between 3 and 12 years presenting for elective ophthalmic surgery, who required tracheal intubation, in this prospective, randomized and double blinded trial. The study was carried out at Nikokari University Hospital, Tabriz, Iran from June 27 to April 28. Children with a history of reactive airway disease; suspected difficult airway and musculoskeletal disease were excluded. Patients were randomly divided in 4 groups with 15 patients in each. They were not premeditated. Upon their arrival to the anesthetic room, baseline heart rate, oxygen saturation and -invasive blood pressure were measured. Intravenous access was secured using a 22-G cannula on the dorsum of a hand. Patients in 4 groups received following infusions: group 1, 1µg/kg remifentanil; group 2, 2µg/kg remifentanil; group 3, 3µg/kg remifentanil; and group 4,.5mg/kg atracurium. The drugs used were diluted up to 5ml, and were labeled by numbers, so that, the anesthesiologist performing intubation was not aware of the type of the injected drug. All intubations were performed by one specialist. The drug was injected over 3 seconds, after which propofol 3 mg/kg was given as a rapid i.v. bolus over 1 seconds. Sixty seconds after injection of propofol, the patients were intubated, and the intubating conditions were evaluated according to the Helbo-Hansen scoring system (table 1) 1 and were recorded. 2
3 If the patient received score 1 or 2 from each items of Helbo-Hansen table, we considered intubating condition as, and if the patient received score 3 or 4, intubating condition was -. In - conditions, intubation was performed after an increase in anesthetic drug. The groups were compared regarding age and gender. The time between intubation and return of spontaneous respiration, and the duration of surgery was recorded. Intubation time less than 3 seconds was considered. The collected data were analyzed using SPSS 13 statistical software. Chi-square test was used for intubation condition score. A P value of <.5 was considered statistically significant. RESULTS Mean age of children was 6.15±2.68 years. The mean age of all groups was not significantly different (P=.523). The duration of surgery was 15 to 18 min, with the average time of 45 min. Table 1. Scoring system (Helbo-Hansen table) used for intubating conditions. Score Laryngoscopy Easy Fair Difficult Impossible Vocal cords Open Moving Closing Closed Coughing None Slight Moderate Severe Jaw relaxation Complete Slight Stiff Rigid Limb movement None Slight Moderate Severe The time of return of spontaneous respiration was not significantly different between the groups (P=.115). This time was minimum min (group 2) and maximum min (group 4). The only - condition in this study was belonging to group 1. The assessment of vocal cord in 4 studied groups showed that the vocal cord status was in 9 cases, of which 4 cases belonged to group 1, 4 belonged to group 2, and one case belonged to group 3. 3
4 Table 2. the condition according Helbo- Hansen table Group 1 Group 2 Group 3 Group 4 P value Coughing 6 (4) 7 (46.6) 8 (53.3) 12 (8) (6) 8 (53.3) 7 (46.6) 3 (2) Limb movement 5 (33.33) 9 (6) 11 (73.33) 12 (8).44 1 (66.66) 6 (4) 4 (26.66) 3 (2) Total Condition 5 (33.33) 6 (4) 9 (6) 12 (8).43 1 (66.66) 9 (6) 6 (4) 3 (2) Laryngoscopy 14(93.3) 15(1) 15(1) 15(1).384 1(6.7) Vocal cords 11(73.3) 11(73.3) 14(93.3) 15(1).83 4(26.7) 4(26.7) 1(6.7) Jaw relaxation 14(93.3) 15(1) 15(1) 15(1).384 1(6.7) As showed in table 2, the cough status of patients in 4 group following tracheal intubation was not significantly different between the groups (P=.133). Jaw relaxation was not significantly different between the groups. However, the limb movement after laryngoscopy and tracheal intubation was significantly different between the groups (P=.44). The most movement (66.66%) was seen in group 1, whereas the least movement 4
5 (2%) in group 4. Tracheal intubation in two patients of group 1 was impossible, but was performed after injection of additional drug. DISCUSSION The use of remifentanil has been reported in pediatric practice, though experience is still limited and it is necessary that various doses of this drug to be evaluated. Because of its very short elimination half-life, remfentanil is normally administered a continuous infusion during surgery. 7 Many studies have used a combination of narcotics with propofol for induction tracheal intubation succesfully in adults without the use of a neuromuscular blocker We performed such study on children with 3-12 years old. A combination of remifentanil 4 µg /kg and propofol 2.5 mg/kg provided excellent or good intubating conditions without the use of neuromuscular blocking agents. 5 We achieved such suitable intubating conditions with remifentanil 3 µg /kg. Morgan et al evaluated intubating conditions following propofol 4 mg/kg combined with either remifentanil 1.25 µg/kg (group R), or suxamethonium 1 mg/kg (group S) and concluded that intubation conditions were significantly more better in group S, and the mean apnea time was significantly more in group R. 2 In our study, the duration of return of spontaneous respiration was not significantly different in various studied groups. The longest duration of apnea time was (21.67±9.484 min) in muscle relaxant group and the shortest duration of was (13.93±6.477 min) in group 2. The intubating conditions were better in muscle relaxant than other groups. McNeil et al evaluated the intubating conditions after propofol 2 mg/kg combined with either a bolus of remifentanil 2 µg/kg or 4 µg/kg, or succinylcholine 1 mg/kg and concluded that the most suitable intubating conditions were achieved with remifentanil 4 µg/kg, and mean duration of apnea following induction was significantly more with remifentanil. 3 In our study, the most apnea duration was seen in the group receiving muscle relaxant, but there was no significant difference between the study groups. Our findings are incompatible with the results of McNeil et al study, probably because of higher dose of remifentanil in their study which result in better intubating conditions and longer duration of apnea. In a study by Batra et al, 4 children (5-1 years) were randomly allocated to one of two groups to receive remifentanil 2 µg/kg (Gp I) or 3 µg/kg (Gp II) before the induction of anesthesia with i.v. propofol 3 mg/kg. Tracheal intubation was successful in all patients without requiring neuromuscular blocking agent. Intubating conditions were clinically in 5% of patients in Gp I compared with 9% of patients in Gp II (P <.5). 1 Woods and Allam found that remifentanil 3 µg/kg with propofol 2 mg/kg without muscular relaxant, resulted in satisfactory intubating conditions in nearly all patients but remifentanil 2 µg/kg resulted in satisfactory intubating conditions in only 75% of patients, 6 demonstrating better results than ours. 5
6 CONCLUSION It is concluded from this study that using remifentanil 3 µg/kg with propofol 3 mg/kg without muscular relaxant provided satisfactory intubating conditions in children. Correspondance: Maarouf Ansari, MSc. Instructor of Anesthesiology, Shohada Hospital, Tabriz University of Medical Sciences, Tabriz, Iran; tell: ; marof_ansari@yahoo.com 1. Assistant Professor of anesthesiology. 2. Anesthesiologist. 3. Instructor of anesthesiology. All from Department of anesthesiology, Tabriz University of Medical Sciences, Shohada Hospital, Tabriz, Iran Received: July 9, 29 Accepted: December 24, 29 REFERENCES 1. Batra YK, Mnams AR, Qattan AL, Ali SS, Qureshi MI, Kuriakose D, et al. Assessment of tracheal intubating Conditions in children using remifentanil and propofol without muscle relaxant. Ped Anesthesia 24;14: Morgan JM, Barker I, Peacock JE, Eissa A. A comparison of intubating condition in children following induction of anesthesia with propofol and suxamethonium or propofol and remifentanil. Anesthesia 27;62: McNeil IA, Culbert B, Russell I. Comparison of intubating conditions following propofol and succinylcholine with propofol and remifentanil 2 ug/kg or 4 ug/kg. Brit J Anesthesia 2;85: Stoelting RK, Miller R. Neuromuscular blocking drugs, In: Miller R. Basics of Anesthesia, fourth ed. USA; Churchill Livingstone. 27; p. 115, Klemola UM, Mennander S, Saarnivaara L. Tracheal intubation without the use of muscle relaxant: remifentanil or alfentanil in combination with propofol. Acta Anaes Scand 2;44: Woods AW, Allam S. Tracheal Intubation without the use of blocking agents. Brit J Anesthesia 25;94:
7 7. Robinson DN, Obrien K, Kumar R, Morton NS. Tracheal intubation without neuromuscular blockade in children: a comparison of propofol combined either with alfentanil or remifentanil. Ped Anaesthesia 1998;8: Hogue CW Jr, Bowdle TA, O Leary C, Duncalf D, Miguel R, Pitts M, et al. A Multicenter Evaluation of Total Intravenous Anesthesia with Remifentanil and propofol for Elective Inpatient Surgery. Anesth Analg 1996;83: Blair JM, Hill DA, Wilson CM, Fee JP. Assessment of tracheal intubation in children after induction with propofol and different doses of remifentanil. Anaesthesia 24;59: Wiel E, Davette M, Carpentier L, Fayoux P, Erb C, Chevaliar D, et al. Comparison of remifentanil and alfentanil during anaesthesia for patients undergoing direct laryngoscopy without intubation. Brit J Anaesthesia 23;91: Weil G, Passot S, Servin F, Billard V. Does spectral entropy reflect the response to intubation or incision during propofol- remifentanil anesthesia? Anesth Analg 28; 16:
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