Abstract
Purpose
This prospective, double-blind, placebo-controlled study was designed to determine the efficacy of nitrous oxide (N2O) in alleviating the pain that followed sequential injection of propofol and rocuronium.
Methods
A total of 205 adult patients (age, 18–68 years) received one of the following combinations: NaCl and 100 % O2 (group C); 0.5 mg/kg lidocaine and 100 % O2 (group L); NaCl and a mixture of 67 % N2O/O2 (group N); or 0.5 mg/kg lidocaine and a mixture of 67 % N2O/O2 (group LN). Vein occlusion was released after 1 min, and 5 ml propofol was injected over 10 s. Pain was evaluated on a visually enlarged, laminated, numeric rating (0–10) scale. The remainder of the induction dose of propofol (with a 3-ml bolus of normal saline and 0.6 mg/kg rocuronium) was then injected. The response to the rocuronium injection was assessed with a four-point scale (0–3).
Results
The incidence and severity of pain from the propofol injection in groups L, N, and LN were significantly lower than those in group C (P < 0.001). Frequency and intensity of the withdrawal response were significantly less in groups N and LN than in groups C and L (no response, P < 0.001; severe response, P < 0.001).
Conclusions
Pretreatment with inhaled N2O can reduce the pain associated with propofol and rocuronium injection. Moreover, N2O (with or without lidocaine) is more effective than lidocaine alone in reducing rocuronium-related withdrawal reactions associated with sequential injection of propofol and rocuronium.
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Kim, E., Kim, C.H., Kim, H.K. et al. Effect of nitrous oxide inhalation on pain after propofol and rocuronium injection. J Anesth 27, 868–873 (2013). https://doi.org/10.1007/s00540-013-1655-z
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DOI: https://doi.org/10.1007/s00540-013-1655-z