Incidence of RINCH in pediatric EMU patients

Area of Science:

• Epileptology
• Pediatric Neurology
• Clinical Neuroscience

Background:

• Rhythmic Ictal Non-Clonic Hand movements (RINCH) are established lateralizing signs in adult frontotemporal epilepsy.
• RINCH have not been well-described or systematically studied in the pediatric epilepsy population.
• Understanding pediatric epilepsy semiology aids in accurate localization and management.

Purpose of the Study:

• To investigate the presence and characteristics of RINCH as an ictal phenomenon in pediatric epilepsy patients.
• To compare pediatric RINCH cases with existing data from adult epilepsy populations.
• To evaluate the lateralizing significance of RINCH in children.

Main Methods:

• Retrospective review of pediatric epilepsy monitoring unit reports over a five-year period.
• Identification of patients exhibiting RINCH during ictal periods.
• Comparison of patient demographics, epilepsy characteristics, EEG findings, and lesion data with adult RINCH literature.

Main Results:

• Nine pediatric patients with RINCH were identified (age 6-15 years).
• Epileptogenic lesions were present in 5 patients (temporal lobe in 5); 4 were non-lesional.
• RINCH was contralateral to the lesion/EEG onset in 7 cases, supporting its lateralizing value, though frontal lobe ictal activity was common during RINCH.

Conclusions:

• RINCH, while rare, appears to retain its lateralizing significance in the pediatric epilepsy population.
• The phenomenon may be under-recognized or under-reported in children.
• Further research is warranted to fully elucidate the incidence and diagnostic utility of RINCH in pediatric epilepsy.