Treatment strategies for anterior cutaneous nerve entrapment syndrome in children: A systematic review

Lidocaine patch as noninvasive alternative treatment option in children with anterior cutaneous nerve entrapment syndrome: A retrospective case series

BACKGROUND

Chronic abdominal pain in children is occasionally caused by anterior cutaneous nerve entrapment syndrome (ACNES). Diagnosing and treating this typical peripheral abdominal wall neuropathy is challenging. Management usually starts with minimally invasive tender point injections. Nevertheless, these injections can be burdensome and might even be refused by children or their parents. However, a surgical neurectomy is far more invasive. Treatment with a Lidocaine 5% medicated patch is successfully used in a variety of peripheral neuropathies.

AIMS

This single center retrospective case series aimed to evaluate the effectiveness and tolerability of lidocaine patches in children with ACNES.

METHODS

Children aged under 18 diagnosed with ACNES who were treated with a 10 day lidocaine patch treatment between December 2021 and December 2022 were studied. Patient record files were used to collect treatment outcomes including pain reduction based on NRS and complications.

RESULTS

Twelve of sixteen children (mean age 13 years; F:M ratio 3:1) diagnosed with ACNES started the lidocaine patch treatment. Two patients achieved a pain free status and remained pain free during a 4 and 7 months follow-up. A third child reported a lasting pain reduction, but discontinued treatment due to a temporary local skin rash. Five additional patients reported pain reduction only during application of the patch. The remaining four children experienced no pain relief. No adverse effects were reported.

CONCLUSION

Lidocaine patches provides pain relief in a substantial portion of children with ACNES.

How Do We Treat Children with Anterior Cutaneous Nerve Entrapment Syndrome and Is the Biopsychosocial Model Also Being Applied? A Scoping Review

Background

Evidence-based guidelines for managing anterior cutaneous nerve entrapment syndrome (ACNES) in children are absent. The primary aim of this review was to scrutinize the evidence supporting currently used treatment interventions. In accordance with the World Health Organization (WHO) guidelines for managing chronic pain in children, these patients and their families and caregivers should be treated within the context of the biopsychosocial model; pain should not be treated purely as a biomedical problem. Therefore, our second aim was to evaluate whether these interventions are applied within the context of the biopsychosocial model, utilizing an inter- or multidisciplinary approach.

Materials and Methods

A scoping review of the literature was conducted to explore treatment strategies for ACNES in children. To ensure a comprehensive overview of published literature on this topic, the search was not restricted based on study type. Two reviewers independently assessed titles and abstracts. After excluding records unrelated to children, full texts were screened for inclusion. Any discrepancies in judgement were resolved through discussion with a third reviewer.

Results

Out of 35 relevant titles, 22 were included in this review. Only 4 articles provided information on long-term outcomes. The overall quality of the review was deemed low. The majority of reports did not address treatment or education within the psychological and social domains. A structural qualitative analysis was not feasible due to the substantial heterogeneity of the data.

Conclusion

The evidence supporting current treatment strategies in children with ACNES is of low quality. More research is needed to establish an evidence-based treatment algorithm for patients with this challenging pain problem. In line with the WHO recommendation, greater emphasis should be placed on a biopsychosocial approach. The ultimate goal should be the development of a generic treatment algorithm outlining an approach to ACNES applicable to all professionals involved.

Pulsed radiofrequency in a paediatric patient with disabling ACNES

Chronic abdominal pain is a highly prevalent entity in the paediatric population and represents a diagnostic challenge for professionals. It is frequently underdiagnosed, and must be treated by a multidisciplinary team after a detailed clinical evaluation has been performed to rule out other pathologies. Anterior cutaneous nerve entrapment syndrome (ACNES) occurs when the anterior cutaneous abdominal nerves become pinched or trapped, causing intense, unilateral, circumscribed abdominal pain. Patients often present a positive Pinch test or Carnett's sign. A stepwise therapeutic approach should be used, reserving the most invasive techniques for patients with refractory ACNES. Among the many different treatments available, local anaesthesia infiltration has shown a high success rate, and surgery should only be performed in the most refractory cases. We report the case of an 11-year old girl with a 6-month history of ACNES that severely affected her quality of life, who responded well to pulsed radiofrequency ablation.

The role of a simple questionnaire predicting treatment success in children with ACNES

BACKGROUND

Some children with chronic abdominal wall pain or groin pain do not have an inguinal hernia but suffer from anterior cutaneous nerve entrapment syndrome (ACNES). Diagnosing ACNES is challenging, especially in children as a diagnostic gold standard is lacking. A paediatric questionnaire containing 17 simple items was earlier found to discriminate between abdominal pain due or ACNES or IBS. Scores range from 0 points (ACNES very unlikely) to 17 points (ACNES very likely). The present study investigates whether this 17-item questionnaire predicted treatment success in children receiving therapy for ACNES.

METHODS

Children < 18 years who presented in a single institute between February 2016 and October 2021 with symptoms and signs suggestive of ACNES completed the questionnaire before intake and treatment. Treatment success after 6-8 weeks was defined as self-reported 'pain-free' (group 1), ' > 50% less pain' (group 2) and ' < 50% less pain' (group 3). Group differences regarding sex, age, BMI, symptoms duration and questionnaire scores were analysed.

RESULTS

Data of 145 children (female 78%, mean age 14.7 ± 2.3 years, mean BMI 21.1 ± 3.9) were analysed. All children received a diagnostic trigger point injection using an anaesthetic agent, and 75.5% underwent subsequent surgery for untractable pain. The three groups were comparable regarding sex distribution, age, BMI and symptoms duration. In addition, questionnaire scores were not different (group 1: n = 89, mean score 13.4 ± 2.7, group 2: n = 24, 13.4 ± 2.3 and group 3: n = 32, 13.0 ± 2.7, p > 0.05).

CONCLUSIONS

Treatment success was attained in 78% of children undergoing surgery for ACNES. A simple questionnaire scoring items associated with abdominal pain did not predict treatment success.