Masseter reflex and blink reflex abnormalities in Chiari II malformation.

Area of Science:

• Neurology
• Developmental Neuroscience
• Pediatric Neurosurgery

Background:

• Myelomeningocele and Chiari II malformation are complex congenital conditions.
• Brainstem involvement is a significant concern in these patients.
• Assessing neurological reflexes offers a window into brainstem function.

Purpose of the Study:

• To evaluate the diagnostic utility of masseter and blink reflexes.
• To differentiate between symptomatic and asymptomatic brainstem dysfunction in myelomeningocele patients with Chiari II malformation.
• To identify specific reflex patterns indicative of neurological compromise.

Main Methods:

• Assessed masseter reflex and blink reflex in 64 patients.
• Categorized patients into symptomatic (18) and asymptomatic (46) groups based on brainstem signs.
• Analyzed reflex abnormalities, including the late contralateral blink reflex component (R2c).

Main Results:

• Masseter reflex abnormalities were more common in symptomatic patients (P = 0.02).
• Blink reflex was highly sensitive, abnormal in 83% of symptomatic and 65% of asymptomatic patients.
• Combined abnormalities of masseter reflex and R2c were strongly associated with symptomatic patients (P = 0.002).

Conclusions:

• Masseter and blink reflexes are valuable tools for assessing brainstem function in myelomeningocele and Chiari II malformation.
• Combined reflex abnormalities, particularly involving the R2c component, significantly aid in identifying symptomatic brainstem dysfunction.
• These reflex evaluations can help stratify patients and guide clinical management.