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Print version ISSN 0034-7094
Rev. Bras. Anestesiol. vol.61 no.1 Campinas Jan./Feb. 2011
Ana Cristina AlimanI; Marilde de Albuquerque PiccioniII; João Luiz Piccioni, TSAIII; José Luiz Oliva, TSAIII; José Otávio Costa Auler Júnior, TSAIV
IMaster's Degree in Anesthesiology from USP, Assistant Physician at InCor-HC-FM-USP
IIPhD in Anesthesiology from USP. Assistant Physician at Anesthesiology Service of InCor- HC-FM-USP
IIIAnesthesiologist, Certified by Sociedade Brasileira de Anestesiologia. Assistant Physician at Anesthesiology Service of InCor-HC-FM-USP
IVAnesthesiologist, Certified by Sociedade Brasileira de Anestesiologia. Professor at Anes thesiology Discipline - Surgery Service, FM-USP
BACKGROUND AND OBJECTIVES: Intraosseous (IO) access has been used with good results in emergency situations, when venous access is not available for fluids and drugs infusion. The objective of this study was to evaluate IO a useful technique for anesthesia and fluids infusion during hemodynamic studies and when peripheral intravascular access is unobtainable. The setting was an university hospital hemodynamics unit, and the subjects were twenty one infants with congenital heart disease enrolled for elective hemodynamic study diagnosis.
METHODS: This study compared the effectiveness of IO access in relation to IV access for infusion of anesthetics agents (ketamine, midazolam, and fentanyl) and fluids during hemodynamic studies. The anesthetic induction time, procedure duration, anesthesia recovery time, adequate hydration, and IV and IO puncture complications were compared between groups.
RESULTS: The puncture time was significantly smaller in IO group (3.6 min) that in IV group (9.6 min). The anesthetic onset time (56.3 second) for the IV group was faster than IO group (71.3 second). No significant difference between groups were found in relation to hydration (IV group, 315.5 mL vs IO group, 293.2 mL), and anesthesia recovery time (IO group, 65.2 min vs IV group, 55.0 min). The puncture site was reevaluated after 7 and 15 days without signs of infection or other complications.
CONCLUSIONS: Results showed superiority for IO infusion when considering the puncture time of the procedure. Due to its easy manipulation and efficiency, hydration and anesthesia by IO access was satisfactory for hemodynamic studies without the necessity of other infusion access.
Keywords: Infusions, Intraosseous; Heart Defects, Congenital; Anesthesia; Angiography; Hemodynamics.
Intraosseous (IO) infusion is considered an useful technique for the administration of medications and fluids in emergency situations when peripheral intravascular access is inaccessible and it was used during the World War II. In 1941, Tocantins et al. 1 introduced the technique for clinical use of fluid infusion that allows immediate access to the vascular system. However, IO infusion was gradually substituted by intravenous catheters (1950-1960) 2. In 1977, from venography studies 3, the interest in IO infusion was renewed and recent literature has referred to the use of IO infusion in emergency situations 4,5.Since the IO space has rigid veins that do not collapse in case of hypovolemia or systemic circulatory failure, it has been considered as an alternative in emergency situations when venous access is extremely difficult. The IO technique is included in standard protocols and training procedures such as the Advanced Pediatric Life Support textbook 6 and it is recommended by the American Heart Association 7 and the American Academy of Pediatrics 8.
Infants with congenital heart disease when undergoing to hemodynamic studies need general anesthesia and they are mainly underweight infants whose venous access is very difficult. The aim of this study was to demonstrate the feasibility of IO access and its efficiency for administering anesthetics agents and hydration fluids during hemodynamic studies to infants with congenital cardiopathies and difficult venous access by conventional means.
After the Institutional Ethics Committee approval and parental consent, infants aged 1 to 12 months with congenital cardiac diseases scheduled for elective hemodynamic study and requiring general anesthesia without tracheal intubation were included. ASA physical statuses were III or IV. None of the infants had fever, cough, viral infection, diarrhea or vomits. For IO infusion technique, patients that had any localized infection were excluded from the study.
The first step in the preparation of infants eligible for the hemodynamic study was to inform the parents about the risks associated with anesthesia and about the hemodynamic study. In addition, the parents were informed that the infant should not drink any water 3 hours and no milk 4 hours before surgery 9. Premedication was intramuscular (IM) ketamine 10 1 mg.kg-1 for either venous access or intraosseous technique. Infants were separated into Intravenous group (IV) and Intraosseous group (IO). Groups IV and IO consisted of 10 and 11 infants respectively. In the IO group the venous access was extremely difficult and would be obtained only by profound venous puncture or dissection. The IO technique was preceded by rigorous asepsis and local anesthesia (lidocaine 1% without epinephrine) followed by the insertion of a 30x0,9 mm sterile needle in the tibia, connecting a continuous infusion pump for the administration of anesthetic agents and fluids. After local anesthesia, an IO puncture was performed 1 to 2 cm just below the tibial tuberosity. Needle should be held in a 45º to 60º inclination and introduced with gentle circular movements until slight resistance was overcome following a short cracking sound. There should be continuous aspiration with a 3 mL syringe containing 2 mL of distilled water, which should make it easier to view the brown substance when aspired. When the infant started to wake up, it was time to inject the following anesthetics: IV group received midazolam 0.20 mg.kg-1, fentanyl 2.24 µg.kg-1, and ketamine 2.24 mg.kg-1; and IO group received midazolam 0.28 mg.kg-1, fentanyl 4.7µg.kg-1, and ketamine 4.7 mg.kg-1. The anesthetics agents were repeated in bolus when necessary for maintenance of anesthesia. The IO procedure was confirmed by radioscopy after injecting contrast (Hexabrix®) (Figure 1). After the infant was anesthetized, the needle set was protected with gauze and plaster forming a cushion, connecting the infusion pump (Infusion Pump 670-SAMTRONIC) for the administration of drugs and fluids (Figure 2). This technique was kept as a venous access for maintenance of anesthesia during hemodynamic study until infant recovered completely from anesthesia and the infusion was interrupted only after complete hydration of the infant. The hydration was accomplished with a mixed solution of glucose 5% (50 mL) and saline 0.9% (50 mL) on the dose of 20 mL.kg-1.h-1. The puncture spot was reevaluated after 7 and 15 days (Figure 2). The infants were clinically evaluated by a pediatrician after one week, six months and one year and no complications regarding the techniques applied on this study were reported.
All results were reported as mean ± standard deviation. After inspecting for normality and homogeneity of variance among groups, differences between groups were calculated using the unpaired Student's t test. Analysis included Wilcoxon's test when appropriate. Statistical analysis was performed using PadGraph Prism software (GraphPad Software Inc., San Diego, CA, U.S.A.).
Table I summarizes etiologic aspects of congenital heart diseases enrolled in the study. The main age of infants was 7.9 ± 4.3 months (IV group) and 7.8 ± 3.8 months (IO group), mean weight was 7.2 ± 1.3 kg (IV group) and 6.9 ± 1.9 kg (IO group), six were female and four were male (IV group) and in the IO group four infants were female and seven were male. Table II summarizes the results of the technique of puncture in the IV group and IO group. The only significant difference for the technique between groups was the puncture time (p = 0.012). The mean anesthetic dose used in the IV group were midazolam (1.58 ± 0.03 mg.kg-1), ketamine (17.64 ± 0.25 mg.kg-1), and fentanyl (17.64 ± 0.25 mg.kg-1). In the IO group those were midazolam (2.18 ± 0.08 mg.kg-1), ketamine (36.6 ± 0.80 mg.kg-1), and fentanyl (36.6 ± 0.80 mg.kg-1) (Figure 3). The onset time of anesthesia (56.3 second) in the IV group was faster than in IO group (71.3 second) (p = 0.014) (Figure 4). The hydration was 20 mL.kg-1.h-1 with the solution described and no significant differences between groups: IV group (315.5 ± 15.5 mL), IO group (293.2 ± 67.4 mL) (p = 0.320). The time for anesthesia recovery in IO group (65.2 ± 20.9 min) and IV group (55.0 ± 14.0 min) were not different (p = 0.201) (Figure 4).
This study has contemplated two different techniques for the infusion of anesthetics agents and hydration during hemodynamic studies in patients with congenital cardiopathies and difficult venous access by conventional means. Our main interest was to demonstrate the efficiency of the IO technique for anesthesia and hydration in the hemodynamic unit. The results demonstrate that IO infusion was an effective method to access the vascular system and delivery to the central circulation, and could be an alternative method for unreachable peripheral venous access. The time to insert the IV needle varied from 4 minutes to 11.5 minutes, with a mean of 9.6 minutes, related to the practitioner's skills. The time to place the IO needle varied from 2 minute to 5 minutes, with a mean of 3.6 minutes, with a significant difference between the groups. The technique of venous cutdown is part of the training program of Advanced Pediatric Life Support. The most preferred cutdown access site is the saphenous vein above the medial malleolus of the tibia, but antecubital, axillary, cephalic and femoral vessels are also suitable and improved procedures using Seldinger techniques have been reported 11, 12. The usual time to achieve access by pediatric surgeons was 6 min in children aged 6-16 years, 8 min in those aged 1 month to 5 years, and 11 min in neonates 13. This time delay makes its use unrealistic for most clinicians, and IO or percutaneous femoral access can be achieved more rapidly 11.
The IO method was compared to the peripheral IV method using the following anesthetic agents: midazolan, ketamine, fenatyl. The effectiveness of hydration on IO route has also been tested, demonstrating that this method could be an alternative when peripheral access is considered difficult or impossible (Figures 1 and 3). This study demonstrated a quick systemic flow during IO infusion (Figure 2). The case reported and reviewed literature 15 of severe laryngospasm during inhalation induction of pediatric patients without intravenous accesss. The speed and effectiveness in treating laryngospasm by intravenous route with suxamethonium agent used as a muscle relaxant was achieved when other IV routes had been inaccessible. Despite intramuscular route being easier, the time response was much slower than the intraosseos route. Clinical experience indicates that the IO route is probably superior to the intramuscular route, and comparable to the intravenous route in response time.
Helm et al. 15 demonstrated the other alternative to the puncture of peripheral veins in emergency situations with children less than 6 years of age. In 37% of the cases (10/27) the IO infusion line was used for induction of general anesthesia; dosage and onset of administered drugs were described as being equivalent to a peripheral infusion line. In all cases, the IO needle was replaced in-hospital within 2 h by a central or peripheral IV line. No complications were observed, and the IO infusion technique was considered a simple, fast and safe alternative method for emergency access to the vascular system in children less than 6 years of age in the pre-hospital setting.
In another study it was observed that the greatest advantage of IO route is the high success rate (about 80%) and most experienced providers can reach an IO route within 1 to 2 minutes. A number of smaller studies and case studies have established the usefulness of this route for the delivery of all resuscitation drugs. the most common side effect seen when using IO route is extravasation. It has been reported in 12% of patients. Compartment syndrome, osteomyelitis, and tibial fracture are rare, but have been reported as well. The side effect of IO method was extravasation on 4 children that had a good recovery (Table II).
IO access can be used as an alternative line for medication/volume expansion when umbilical or other direct venous access are not readily attainable (Class IIb, LOE 5) 17. Two prospective randomized trials in adults and children (LOE 3) 18,19 and 6 other studies (LOE 4 20; LOE 5 21,22; LOE 7 23,24) have supported IO access as safe and effective for fluid resuscitation, drug delivery, and blood sampling for laboratory evaluation. The consensus process (2006) that produced this document was sponsored by the International Liaison Committee on Resuscitation (ILCOR) and demonstrated per patient IO success rates that were high despite a small number of attempts over a prolonged time period. These data suggest that successful IO access with a low complication rate can be accomplished despite its infrequent use.
In our study, it was observed that after having administrated anesthetics agents the onset time for IO infusion was significantly faster than the observed in the IV group however the mean mass of anesthetic agents were smaller for IV group. Nevertheless, even though the higher anesthetics dose for IO group impaired anesthesia recovery time, no difference was observed between the groups for awakenings. The time for the cathether maintenance was similar in the groups. The fasting before procedure and the injection of hyperosmolar contrast were factors that may contribute to cause important dehydration during hemodynamic studies, therefore it is necessary to promote the infusion of fluids during this procedure. The volume of fluid for hydration was similar in both groups, but in the IO group an infusion pump for administering fluids was necessary because the high vascular IO resistance. Considering that since the 1830s fluids have been administered intravenously, and IV access is not always possible to be established, the IO route provides rapid, safe and easy access to the vascular system.
In conclusion when peripheral IV access is unobtainable, IO infusion has been shown to be an effective and safe alternative for administering anesthetic agents and fluids for hemodynamic studies.
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Correspondence to: Submitted on July 28, 2010. Received from the Divisão de Anestesiologia e Terapia Cirúrgica do Instituto do Coração of Hospital das Clínicas of Faculdade de Medicina of Universidade de São Paulo (InCor- HC-FM-USP), Brazil.
Dr. José Otávio Costa Auler Júnior
Av. Dr. Enéas de Carvalho Aguiar, 44 - 2º andar - bloco I, Cerqueira César
05403-000 - São Paulo, SP, Brazil
Approved on August 12, 2010.
Submitted on July 28, 2010.
Received from the Divisão de Anestesiologia e Terapia Cirúrgica do Instituto do Coração of Hospital das Clínicas of Faculdade de Medicina of Universidade de São Paulo (InCor- HC-FM-USP), Brazil.