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lu*
Departments of *Anaesthesiology and
Biostatistics, Trakya University, Edirne, Turkey
Address correspondence and reprint requests to Dr. Dilek Memi
, Trakya University Medical Faculty, Department of Anaesthesiology and Reanimation, 22030, Edirne, Turkey. Address e-mail to dilmemis{at}mynet.com
| Abstract |
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IMPLICATIONS: We compared the efficacy of ondansetron, lidocaine, tramadol, and fentanyl in minimizing the pain on injection of rocuronium in 250 patients. Ondansetron, lidocaine, tramadol, and fentanyl were effective in preventing and decreasing the level of rocuronium injection pain. Among these drugs, lidocaine was the most effective, and fentanyl was the least effective.
| Introduction |
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Ondansetron is an antiemetic drug that, upon the demonstration of its local anesthetic property, began to be used in the prevention of injection pain of propofol (46). Ye et al. (5) have demonstrated that ondansetron blocks sodium channels in the neurons of the rat brain and might serve as a prototype molecule for developing a novel series of local anesthetics. Several studies have tried to determine the concentration of lidocaine and fentanyl that most efficiently diminishes or eliminates pain from propofol and rocuronium injection (3,79).1 Tramadol is a synthetic analgesic that can be used to treat moderate and severe pain (10). Pang et al. (11) observed a local anesthetic effect with intradermal injection of tramadol and lidocaine, and Tsai et al. (12) demonstrated a local anesthetic-type effect by possible neural conduction blockage of tramadol on sciatic nerves of rats. Fentanyl showed a local analgesic effect in reducing the pain on propofol injection, but the mechanisms of action are unknown (13,14). We compared the efficacy of ondansetron, lidocaine, tramadol, and fentanyl in minimizing the pain caused by injection of rocuronium.
| Methods |
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The patients were randomly assigned to five groups. The study was designed to be randomized and double-blinded. A randomization list was generated, and identical syringes containing each drug were prepared by personnel blinded to the study, according to the list. No premedication was given. The patients were then taken into the operating room, the backs of both hands were catheterized with 20-gauge catheters, and the mean arterial pressure, SpO2, and heart rate were monitored. With the aim of keeping the drug within the vein, the forearm was squeezed with a tourniquet up to 70 mm Hg; the patients were administered saline (3 mL) (Group 1, n = 50), ondansetron 4 mg (Group 2, n = 50), lidocaine 30 mg (Group 3, n = 50), tramadol 50 mg (Group 4, n = 50), or fentanyl 100 µg (Group 5, n = 50), diluted into 3 mL of saline IV at ambient operating room temperature (20°C22°C). The occlusion was released after 20 s and a tracheal intubating dose of 0.6 mg/kg of rocuronium at room temperature was injected over 1015 s. The patients were observed and asked immediately if they had pain in the arm, and the response was assessed. Reactions such as discomfort and pain, tears in the eye, withdrawal of the hand, and so on after the administration of the rocuronium were recorded as side effects (15) (Table 1). Thirty seconds after the administration of rocuronium, 5 mg/kg of thiopental was administered IV. For the crystalloid infusion and other medication, the IV catheter opened in the alternate hand was used. Via orotracheal intubation, anesthesia was continued during 50% N2O/oxygen and isoflurane anesthesia. Within the first 24 h after the operation, the injection site was checked for any complications, such as pain, swelling, or allergic reactions, by an anesthesiologist who did not know which drug was administered.
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2 test was used for paired comparison of groups. P < 0.05 was taken as a significant value. | Results |
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2 = 71.128, P = 0.000). This correlation was found in Group 1 pain score 0 (z = -4.75, P < 0.001), Group 1 pain score 1 (z = -2.47, P < 0.001), and Group 3 pain score 0 (z = 3.09, P < 0.001). This was the result of differences in pain intensity. According to our results, the most effective drug was lidocaine.
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| Discussion |
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Venous retention with a tourniquet is a technique often used for pretreatment of propofol injection pain (13,14,16). In our study we also used this technique.
Ondansetron is an antiemetic drug and a commonly used 5-hydroxytryptamine-3 antagonist (4). Ye et al. (5) have demonstrated that ondansetron blocks sodium channels in neurons of the rat brain and might serve as a prototype molecule for developing a novel series of local anesthetics. Ondansetron can block sodium channels similar to local anesthetics; peripheral 5-hydroxytryptamine-3 receptors are also involved in nociceptive pathways and have demonstrated binding at opioid µ receptors exhibiting agonist activity, thus resulting in a peripheral antinociceptive effect (5,20). Ondansetron also attaches to opioid µ receptors with agonist activity and may be effective in preventing injection pain caused by drugs such as propofol (20). Ambesh et al. (6) administered 2 mL (4 mg) of ondansetron to successfully prevent injection pain. Reddy et al. (21) found that pain from rocuronium and propofol was significantly reduced in the ondansetron (4 mg) and lidocaine (50 mg) groups compared with placebo and that pain was significantly less with lidocaine than with ondansetron. In our study, we used similar doses of ondansetron as Ambesh et al. (6) and Reddy et al. (21) and found that this method decreased but did not eliminate pain.
Lockey and Coleman1 reported marked discomfort in all patients who received 0.6 mg/kg of rocuronium IV immediately after an induction dose of propofol mixed with 20 mg of lidocaine; this discomfort seemed to be unrelated to the discomfort from propofol. Cheong and Wong (8) evaluated whether prior administration of lidocaine 10 or 30 mg IV decreased the incidence of injection pain. They found that both lidocaine 10 and 30 mg IV given before the administration of rocuronium significantly reduced the incidence and severity of pain from injection of rocuronium and that the larger dose was more effective. In our study we determined that 30 mg of lidocaine was the most effective in reducing pain.
Tramadol is an analgesic drug with central effects that produces an analgesic effect by preventing the norepinephrine uptake and release without activating all of the opioid receptors (22). Pang et al. (22) found that injection of 25 mg of tramadol IM has a local anesthetic effect. Pang et al. (23) also observed that 50 mg of tramadol IV prevents injection pain from propofol as compared with lidocaine. However, neither drug totally eliminates the pain. In our study, 50 mg of IV tramadol did not completely eliminate injection pain.
Joshi and Whitten (3) found that 2 mg of IV midazolam and 100 µg of fentanyl does prevent the pain associated with the injection of a defasciculating dose of rocuronium (0.06 mg/kg) in an unspecified number of adult patients. Borgeat et al. (24) found that 2 µg/kg of IV fentanyl is effective in reducing rocuronium injection pain. In our study, IV fentanyl 100 µg decreased the pain but was not as effective as ondansetron, lidocaine, or tramadol.
Klement and Arndt (18) showed that injection of acidic solutions causes pain. The authors noted that after injection of acidic solutions, perivenous edema developed immediately. In our study, we did not see such side effects.
We conclude that ondansetron, lidocaine, tramadol, and fentanyl were effective in decreasing the level of rocuronium injection pain. According to our study, lidocaine was the most effective drug, whereas fentanyl was the least effective, in reducing injection pain.
| Footnotes |
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| References |
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