[A case of benign neonatal sleep myoclonus]

Area of Science:

• Neonatal neurology
• Pediatric sleep disorders
• Clinical neurophysiology

Background:

• Benign neonatal sleep myoclonus (BNSM) is a rare, self-limiting condition characterized by involuntary muscle jerks during sleep in newborns.
• Distinguishing BNSM from more serious epileptic seizures is crucial for appropriate management and to prevent unnecessary interventions.

Observation:

• A male infant presented with frequent, bilateral, and synchronous myoclonic jerks in the extremities during sleep, starting at 12 days of age.
• These episodes persisted for several minutes, with normal interictal and ictal electroencephalogram (EEG) findings.
• The myoclonic jerks gradually subsided without any pharmacological intervention and completely disappeared by 50 days of age.

Findings:

• The case demonstrates a typical presentation of benign neonatal sleep myoclonus.
• Normal EEG findings in both sleep and wake states support a non-epileptic etiology.
• The spontaneous resolution of symptoms by 50 days of age confirms the benign nature of the condition.

Implications:

• Early and accurate diagnosis of BNSM is essential to reassure parents and avoid unnecessary investigations or treatments.
• EEG-EMG recordings can be a valuable tool in differentiating BNSM from other movement disorders.
• Understanding the natural history of BNSM aids in clinical decision-making and resource allocation in neonatal care.