Anna Taddio, BScPh n, MSc, PhD; Neil Pollock, MD; Cheryl Gilbert-MacLeod, MA, PhD; Kristina Ohlsson; Gideon Koren, MD
From the Departments of Pharmacy (Dr Taddio and Ms Ohlsson) and Paediatrics (Dr Koren), The Hospital for Sick Children, Toronto, Ontario; the Pollock Clinics, Vancouver, British Columbia (Dr Pollock); and the Department of Psycology, IWK Grace Health Centre, Halifax, Nova Scotia (Dr Gilbert-MacLeod).
Background: Pain of circumcision is only partially relieved by single modalities, such as penile nerve block,lidocaine-prilocaine cream, and sucrose pacifiers.
Objective: To assess the effectiveness of a combination of interventions on the pain response of infants undergoing circumcision.
Methods: Cohort study. Group 1 included infants circumcised using the Mogen clamp and combined analgesics (lidocaine dorsal penile nerve block, lidocaineprilocaine, acetaminophen, and sugar-coated gauze dipped in grape juice). Group 2 included infants circumcised using the Gomco clamp and lidocaine-prilocaine. Infants were videotaped during circumcision, and pain was assessed using facial activity scores and percentage of time spent crying.
Results: There were 57 infants in group 1 and 29 infants in group 2. Birth characteristics did not differ be tween groups. Infants in group 1 were older than infants in group 2 (17 days vs 2 days) (P<.001). The mean duration of the procedure was 55 seconds and 577 seconds for infants in group 1 and 2, respectively (P<.001). Facial action scores and percentage of time spent crying were significantly lower during circumcision for infants in group 1 (P<.001). The percentage of time spent crying was 18% and 40% for infants in groups 1 and 2, respectively. No adverse effects were observed in infants in group 1; 1 infant in group 2 had a local skin infection.
Conclusions: Infants circumcised with the Mogen clamp and combined analgesia have substantially less pain than those circumcised with the Gomco clamp and lidocaineprilocaine cream. Because of the immense pain during circumcision, combined local anesthesia and analgesia using the Mogen clamp should be considered.
Circumcision is performed in millions of male newborns worldwide. Despite evidence that circumcision is painful, the procedure continues to be performed without adequate analgesia.1 Analgesics are not administered routinely by physicians because of concerns regarding the side effects of drugs and perceived lack of importance of pain.2
Dorsal penile nerve block (DPNB) was demonstrated previously to be effective for this procedure.3-5 We showed that lidocaine-prilocaine cream (eutectic mixture of local anesthetics [ EMLA ]) can decrease the pain from circumcision.2 In a recent study that compared EMLA with DPNB and ring block with lidocaine, both infiltration methods were superior to EMLA.6 Sucrose given with a pacifier was shown to have some benefits7,8 and acetaminophen may be helpful for postoperative pain.9
Combination interventions are more effective than single interventions. Stang et al10 found that DPNB and a pacifier dipped in sucrose were more effective than DPNB and a pacifier dipped in water. Mohan et al11 found that sucrose and EMLA together were better than either sucrose or EMLA alone. Using EMLA prior to DPNB decreased needle penetration pain but did not improve overall analgesia achieved by DPNB in older children.12
A recent study demonstrated that pain from circumcision is affected by the technique used to perform the procedure. In that study, the Mogen clamp was associated with less pain than the Gomco clamp.13 This may have been at least in part caused by the shorter procedure time associated with the Mogen clamp technique. In addition, infants premeditated with the DPNB during circumcision with the Mogen clamp had less pain than infants circumcised using the same method who were not given an analgesic.
The ultimate goal of pain management during circumcision is to prevent pain. We hypothesized that we could approach this goal if a combination of analgesic interventions and the Mogen clamp technique were employed together. The objectives of this study were to assess the effectiveness and safety of a combination of interventions including EMLA cream, DPNB, acetaminophen, and sugarcoated gauze on the pain response of infants undergoing circumcision using the Mogen clamp technique.
Eighty-six infants participated in the study: 57 infants in group 1 and 29 in group 2. There were no dropouts in either group. For 1 infant in group 1, the quality of the video recording was poor and facial action coding could not be performed. Demographic data are shown in the Table. Other than postnatal age, there were no significant differences between the groups.
The duration of the procedure was significantly shorter for infants circumcised using the Mogen clamp compared with those circumcised with the Gomco clamp (mean [SD], 55.0 seconds [12.6] vs 576.6 seconds [64.11])(P<.001).
The facial activity scores recorded during circumcision are shown in Figure 1. The scores were significantly lower (P<.001) for infants in group 1. Group 1 had significantly lower pain scores (P<.05) during forceps application, lysis of adhesions, and application and removal of clamp.
Infants in group 1 cried for proportionately less time than infants in group 2 during the entire procedure (Figure 2) (P<.001). The percentage of time spent crying was shorter (P<.01) for infants in group 1 during forceps application, lysis of adhesions, and application and removal of clamp. Twenty-six infants (46%) in group 1 did not cry at all during the procedure and 7 (12%) cried for less than 10% of the time; the mean percentage of time spent crying during the circumcision was 18% compared with 6% during baseline (P<.05).
Postnatal age and percentage of time crying during the entire procedure were not correlated (r=0.07; P=.61). Similar results were obtained when each phase of the procedure was analyzed separately, using either facial activity scores or percentage of time crying as outcome variables.
There were no adverse effects reported in infants in group 1. One infant in group 2 had an infection at the surgical site that was treated with a topical antibiotic.
In this study, we evaluated pain in infants during circumcision with the Mogen clamp and a combination of local anesthetics and analgesics. The rationale for this study was that treatment strategies studied to date have not been shown to completely eliminate pain in all infants; we previously demonstrated that neonatal circumcision has long-term effects on infant pain response to routine 4- and 6-month vaccination.14 We postulated that decreasing the duration of circumcision and providing maximal analgesia would minimize pain for the infants and thus prevent potential long-term sequelae. Our results demonstrated that this “holistic” approach was associated with a significantly shorter procedure time and less pain than circumcision using the Gomco clamp and EMLA. However, infants continued to exhibit some pain responses during the procedure. It is unclear how much of their responses are caused by pain from the procedure vs discomfort from being restrained. Furthermore, it is not known whether the approach used in this study prevents changes in future infant pain behaviors at routine vaccination.
Our study was designed to examine the overall effectiveness of combined analgesia and anesthesia on infant pain response rather than the effectiveness of each specific analgesic. In comparison with a study of the Mogen clamp and DPNB plus pacifier analgesia,13infants in this study cried for proportionately less time (18% vs 31%), suggesting that the additional analgesics (EMLA, sucrose, and acetaminophen) helped minimize pain. In the previous study, however, 56% of infants did not cry during the procedure13compared with 46% in this study. In another study of the Mogen clamp and DPNB analgesia, more infants cried during the procedure (73%)15 than in this study.
We used a larger volume of lidocaine for anesthesia (at half the concentration) compared with other published studies in the literature. We did this to facilitate diffusion of the drug to the target site of action. We observed no complications in infants treated with combination analgesia. Our data are consistent with previously published safety data on DPNB and EMLA for use in neonates.16,17Concurrent use of EMLA, DPNB, and acetaminophen did not lead to a clinically significant risk of methemoglobinemia. These data add to a recently published study demonstrating no additive effect of acetaminophen on methemoglobin concentrations in 10 neonates treated with acetaminophen 12 hours before receiving EMLA.18
We evaluated the effect of postnatal age on infant pain response to determine if the analgesic regimen was appropriate for newborns after the first few days of life. We found no differences in infant responses between newly born and older infants up to 72 days of age. These results suggest that the analgesic regimen evaluated is equally effective in newborn and older infants. It also demonstrates that the different mean gestational ages between the study groups did not contribute to the differences in pain response detected by us.
Provisions were made to maintain similar conditions in the environments of infants in both groups while they were undergoing the procedure. It is possible that some differences in infant responses may be because of differences between the surgeons. However, both physicians perform circumcisions on a daily basis and are skilled in the technique they use. The results obtained in this study for infants circumcised with EMLA and the Gomco clamp are sufficiently similar to previous studies using EMLA and the Gomco clamp19
to suggest that the skill of the surgeon did not explain differences between groups. Similarly, the results obtained for the infants circumcised with combined analgesia and the Mogen clamp are somewhat similar to previous studies of DPNB and the Mogen clamp.13
We believe that if circumcision is to be performed, it should be done using the least painful method. We have demonstrated that circumcision with the Mogen clamp and combined analgesia is safe and minimizes pain from this procedure. Accepted for publication November 11, 1999.
We believe that if circumcision is to be performed, it should be done using the least painful method. We have demonstrated that circumcision with the Mogen clamp and combined analgesia is safe and minimizes pain from this procedure.
Accepted for publication November 11, 1999. Corresponding author: Anna Taddio, BScPhm, MSc, PhD, Department of Pharmacy, The Hospital for Sick Children, 555 University Ave, Toronto M5GIX8, Ontario, Canada (e-mail: firstname.lastname@example.org).
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