Cooling spray or lidocaine spray and needle insertion pain in hemodialysis patients: an open-label cross-over randomized clinical trial

BACKGROUND: The needle insertion pain to perform hemodialysis is the main challenge and a common problem that requires pain management techniques for patients’ comfort. AIM: This study aimed to compare the effects of cooling and lidocaine sprays on needle insertion pain in hemodialysis patients. METHODS: In this randomized cross-over clinical trial study, the hemodialysis patients were selected through convenience sampling according to inclusion criteria and randomly assigned to three intervention groups using the block randomization method. Each patient received three interventions in a cross-over design: Cooling spray or 10% lidocaine spray or placebo spray. There was a 2-week wash-out time between each intervention. The pain score was measured four times for each patient by the Numerical Rating Scale. RESULTS: Forty-one hemodialysis patients were included. The results showed a significant interaction between time and group (p < 0.05), so only observations of time 1 with adjustment for baseline values were used to evaluate the effect of the intervention. Patients receiving cooling spray reported 2.29 less pain score on average compared to placebo (B=-2.29, 95% CI: -4.17 to -0.43; p < 0.05); Also, patients receiving cooling spray reported a 1.61 lower pain score than those receiving lidocaine spray, but this difference was not statistically significant (95% CI: -0.26 to 3.48; p > 0.05). CONCLUSION: The cooling spray was effective in reducing the needle insertion pain. Although it was impossible to compare the pain scores at different times and following different interventions, the present study results can help supplement the existing knowledge regarding cooling and lidocaine sprays.