Which of the following is a sign of neurologic involvement in kernicterus?

• A. Downward gaze
• B. Fixation on one point
• C. Gaze palsies
• D. Inability to cry

Answer: (C)

Kernicterus is a serious condition resulting from severe neonatal jaundice that can lead to direct bilirubin toxicity and damage to the brain, particularly in specific areas such as the basal ganglia and brainstem. Signs of neurologic involvement can manifest through various eye movement abnormalities. Gaze palsies, specifically, refer to the inability to move the eyes in a coordinated manner, often resulting in paralysis of gaze in one or both directions. This is particularly relevant in kernicterus, where the brain regions affected can disrupt normal eye movement control.

When infants with kernicterus exhibit gaze palsies, it indicates a disturbance in the neurological pathways responsible for voluntary eye movements, which is a direct manifestation of the underlying neurological damage. This finding is critical for diagnosing kernicterus and assessing the extent of neurological involvement, as it can help differentiate from other conditions with similar symptoms.

Other signs such as downward gaze, fixation on one point, and inability to cry may suggest different types of neurological or behavioral issues but are not specifically indicative of the gaze control dysfunction seen in kernicterus. Understanding these signs can assist healthcare professionals in providing timely intervention and management for affected infants.