|Year : 2014 | Volume
| Issue : 2 | Page : 95-98
Topical anesthetic versus lidocaine infiltration in arteriovenous fistula cannulation
Anisha George1, Pratish George2, Deepak Masih2, Nina Philip2, David Shelly2, Jasmin Das2, Timothy Rajamanickam2
1 Department of Dermatology, Christian Medical College, Ludhiana, Punjab, India
2 Department of Nephrology, Christian Medical College, Ludhiana, Punjab, India
|Date of Web Publication||11-Jun-2014|
Department of Nephrology, Christian Medical College, Ludhiana 141 008, Punjab
Source of Support: None, Conflict of Interest: None
Background: End stage renal disease (ESRD) patients on maintenance hemodialysis undergo arterio-venous fistula (AVF) cannulation prior to each hemodialysis session for blood access. Prior to cannulation lidocaine infiltration is done, which is often perceived as painful. Eutectic mixture of local anesthetic (EMLA) has been found to significantly reduce pain associated with radial artery cannulation compared with lidocaine infiltration. Aims: To evaluate the efficacy of EMLA compared to infiltration of lidocaine in hemodialysis patients for AVF cannulation. Materials and Methods: A single-centre, crossover study of patients with an AVF on regular maintenance hemodialysis was performed in the dialysis unit of a tertiary care teaching hospital. The site of AVF, number of attempts for AVF cannulation and cannula insertion time were recorded. The patients were asked about the acceptability of application of the anesthetic, delay between anesthetic and cannulation and to score the pain on cannulation. Results: Fifty patients were included in the study. With the visual analog scale, pain score on infiltration was 4.8. Pain score on cannulation after topical application was 2.9 and after infiltration, 2.0. The number of attempts for cannulation and the cannula insertion time were similar. Anesthesia was more stressful in the injectable group rather than the topical group (P < 0.001). Delay between anesthetic and cannulation was unacceptable in the topical group (P < 0.001). Patient compliance was better during infiltration compared to topical (P < 0.005). Mean pain score during infiltration of anesthetic was significantly higher than cannulation pain after either anesthetic, although pain on cannulation was higher in the topical group (P < 0.001). Conclusions: EMLA offers a suitable alternative to lidocaine infiltration for patients using AVF for blood access.
Keywords: Cannulation, eutectic mixture of local anesthetic, infiltration, topical anesthetic
|How to cite this article:|
George A, George P, Masih D, Philip N, Shelly D, Das J, Rajamanickam T. Topical anesthetic versus lidocaine infiltration in arteriovenous fistula cannulation. CHRISMED J Health Res 2014;1:95-8
|How to cite this URL:|
George A, George P, Masih D, Philip N, Shelly D, Das J, Rajamanickam T. Topical anesthetic versus lidocaine infiltration in arteriovenous fistula cannulation. CHRISMED J Health Res [serial online] 2014 [cited 2017 Apr 27];1:95-8. Available from: http://www.cjhr.org/text.asp?2014/1/2/95/134269
| Introduction|| |
End stage renal disease (ESRD) patients undergo regular hemodialysis and native radiocephalic arteriovenous fistula (AVF) is the preferred arteriovenous access for hemodialysis.  AVF is accessed using 15-18 gauged dialysis fistula needles. Local anesthesia is obtained using 2% lidocaine subcutaneous infiltration which is often perceived as painful. Topical anesthetics were found to have equal efficacy compared to lidocaine infiltration but were less painful for closure of skin wounds in children.  Eutectic mixture of local anesthetic (EMLA) has been found to significantly reduce pain associated with radial artery cannulation compared to lidocaine infiltration and also improves the success rate of cannulation.  Eutectic mixtures consist of liquids that melts at temperature lower than the individual components, thus allowing greater concentrations.  EMLA is a combination of lidocaine 25 mg/g and prilocaine 25 mg/g; which is effective in producing dermal analgesia. Side effects of EMLA are few, the most common being mild blanching and erythema. 
EMLA has not been compared to lidocaine infiltration for AVF cannulation. The aim of this study was to evaluate the efficacy of EMLA cream compared with infiltration of lidocaine in hemodialysis patients for AVF cannulation.
| Materials and Methods|| |
This single-center, crossover study was conducted in the dialysis unit of the Department of Nephrology, Christian Medical College, Ludhiana, after institutional research committee approval, from September 2012 to March, 2013. The principal investigator recruited patients with an AVF on regular maintenance hemodialysis after obtaining a written informed consent. Patients were randomized into two groups, each starting with either the topical or injectable local anesthetic. Crossover between topical and injectable local anesthesia was performed a total of four times to eliminate memory bias. Patients were asked to apply a thick layer of topical anesthetic [Figure 1] under occlusion with a micropore tape [Figure 2] for one hour prior to cannulation. The fistula was accessed using a 16-guage needle. Subcutaneous infiltration of lignocaine was performed with a 26-guage needle. The site of AVF, number of attempts for cannulation, and cannula insertion time were recorded. The patients were asked about the acceptability of application of the anesthetic (on a scale of 1-10; where 1 was acceptable and 10 stressful), delay between anesthetic and cannulation (acceptability of delay between anesthetic and cannulation on a scale of 1-10; where 1 was unacceptable and 10 acceptable), and to score the pain on cannulation with the Visual Analogue Scale (VAS) (on a scale of 0-10; where 0 was not painful at all and 10 excruciatingly painful). Patient compliance was assessed by the principal investigator (noncompliance was scored as 1 and total compliance as 10). Presence of any erythema, irritation, or itching at the site of application of anesthetic was noted, as was wound infection at the puncture site on follow-up. Demographic data was collected from the patients' hospital records. Statistical analysis was performed using SPSS 16.0 (SPSS Inc., Chicago, Illinois, U.S.A). P < 0.05 was considered significant.
|Figure 1: Application of a thick layer of EMLA cream over the sites to be punctured for AVF cannulation|
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| Results|| |
Fifty patients were included in the study. The baseline demographic profile is depicted in [Table 1]. Twenty-seven patients (54%) were radiocephalic, while the remaining had brachiocephalic fistulas. Most of the patients were hypertensive, 22 (44%); 19 (38%) were hypertensive as well as diabetic. None of the patients who received EMLA required additional lidocaine infiltration. The number of attempts for cannulation and cannula insertion time were the same whether EMLA was applied or lidocaine infiltrated. On a scale of 1-10; where 1 was acceptable and 10 stressful, the mean score for infiltration was 6.4 and 1.6 for topical application. Anesthesia was more stressful in the injectable group rather than the topical group (P < 0.001). The mean score for acceptability of delay between anesthetic and cannulation on a scale of 1-10 was 4.7 for topical and 7.1 for infiltration. Delay between anesthetic and cannulation was unacceptable in the topical group (P < 0.001). With the VAS, pain score on infiltration was 4.8. Pain score on cannulation after topical application was 2.9 and after infiltration was 2.0. The number of attempts for cannulation and the cannula insertion time were similar, as mentioned in [Table 2]. No side effects to the topical EMLA were noted in any patient, namely erythema, irritation, or itching at the site of application. No patient had wound infection at the puncture site on follow up. Patient compliance was better during infiltration compared to topical (P < 0.005). Mean pain score during infiltration of anesthetic was significantly higher than cannulation pain after administration of either anesthetic, although pain on cannulation was higher in the topical group (P < 0.001).
| Discussion|| |
Native radiocephalic AVF is the preferred vascular access for hemodialysis.  It is associated with the lowest risk for death, infections, and cardiovascular events compared to an arteriovenous graft or central venous catheter.  An AVF is thought to be mature when it has a readiness for flow as well as cannulation.  EMLA, when compared to placebo cream ,, or ethyl chloride vapocoolant spray,  has been shown to significantly decrease the pain associated with venepuncture during AVF cannulation. Anesthetic creams have been recommended to reduce pain and discomfort for fistula puncture in children.  Our study included only a single child, who was a 12-year-old. It has been established that the use of EMLA doesn't interfere with the success of venepuncture or venous cannulation,  similar to that found in our study. Tetracaine, liposome-encapsulated tetracaine, and liposome-encapsulated lidocaine were found to be at least as efficacious as EMLA.  Topical anesthetics are thought to be under-utilized, despite their equal efficacy compared to lidocaine infiltration,  owing to their slow onset of action and inconsistent effectiveness.  However, we found that additional infiltration of anesthetic was not needed in any of our patients, and it was effective in all our patients after one hour of occlusion. Side effects with EMLA are rarely reported, which include irritation  and allergic contact dermatitis.  None of our patients had any side effects to the EMLA cream. In a randomized controlled study, EMLA was found to significantly reduce pain associated with radial artery cannulation compared with lidocaine infiltration and improved the success rate of the cannulation.  Success rate of AVF cannulation was unaffected in our study.
The application of anesthetic was significantly more stressful in the injectable infiltration group rather than the EMLA group. Delay between anesthetic and cannulation was found to be significantly unacceptable in the EMLA group, so, patient compliance, as assessed by the physician, was better during infiltration of anesthetic compared to EMLA. Mean pain score during infiltration of anesthetic was significantly higher than cannulation pain after either anesthetic even though pain on cannulation was slightly higher in the EMLA group. The buttonhole (constant site) AVF cannulation technique, in which the inserted needle utilizes exactly the same site and the same angle every dialysis session, was found to be less painful than the traditional method;  this technique was not used for our study.
| Conclusion|| |
Topical anesthesia with EMLA (combination cream of prilocaine and lidocaine) has shown to have comparative efficacy and acceptability as compared to injectable lidocaine with no side effects. Pain on lidocaine infiltration is more than that on cannulation of the AV fistula with either modality and stressful for the patient. Delay in cannulation as a result of EMLA cream application and occlusion was a drawback, reducing patient compliance for the EMLA cream. EMLA offers a suitable alternative to lidocaine infiltration for people undergoing maintenance hemodialysis using AVF for blood access.
| Acknowledgment|| |
Ms. Paramdeep Kaur (for technical and statistical help).
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[Figure 1], [Figure 2]
[Table 1], [Table 2]