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Difficulty: HardPediatric Neurologic Disorders

A 16-month-old girl is brought to the pediatric neurology clinic by her parents due to a frightening episode that occurred 2 days ago. While playing with her older brother, a toy was taken from her. She became enraged, cried vigorously, and then held her breath in expiration. She quickly turned blue around the lips and lost consciousness. During the 30 seconds she was unconscious, her parents witnessed two brief, symmetric jerking movements of her arms. She promptly regained consciousness and returned to her normal baseline within 2 minutes. The patient was born at term and has no significant past medical history. Her parents report she can walk independently, use a pincer grasp, and say "mama," "dada," and two other words. Vital signs are within normal limits. Physical examination demonstrates normal muscle tone, 5/5 strength, and 2+ deep tendon reflexes globally. Cardiovascular examination reveals a regular rate and rhythm with no murmurs. Which of the following is the most appropriate next step in the management of this patient?

  1. Measurement of serum ferritin and hemoglobin levelsAnswer
  2. B
    Electroencephalography
  3. C
    Transthoracic echocardiography
  4. D
    Referral to an early intervention program for language delay
  5. E
    Prescription of a short-acting inhaled bronchodilator

Answer

The most appropriate next step is the measurement of serum ferritin and hemoglobin levels to evaluate for iron deficiency anemia.
This patient's presentation is classic for a cyanotic breath-holding spell. These spells typically occur in children between 6 months and 5 years of age and are provoked by an emotional trigger (e.g., anger, frustration, pain). The child cries vigorously, holds their breath in expiration, and rapidly develops cyanosis followed by loss of consciousness. Due to the transient cerebral hypoxia, it is common for the child to exhibit brief posturing or a few myoclonic jerks, which are often mistaken for an epileptic seizure by parents and clinicians. While breath-holding spells are generally benign and self-limiting, they are strongly associated with iron deficiency anemia. Therefore, the standard of care includes screening with a complete blood count and serum ferritin levels. If iron deficiency is identified, iron supplementation can significantly reduce the frequency and severity of the spells.

Step-by-Step Solution

1
Analyze the clinical presentation and triggers.
The sequence of provoked anger/crying, expiratory apnea, cyanosis, and brief syncope is classic for a cyanotic breath-holding spell.
Identifying the paroxysmal event correctly distinguishes it from true epileptic seizures or primary cardiac events.
2
Evaluate the neurologic symptoms during the episode.
The brief myoclonic jerks occurred during the unconscious, hypoxic period.
Brief posturing or jerking is a common physiological consequence of transient cerebral hypoxia and does not indicate a primary seizure disorder.
3
Assess the patient's developmental milestones.
Walking independently, using a pincer grasp, and speaking 4 words are all normal, age-appropriate milestones for a 16-month-old.
Confirming normal development prevents unnecessary referrals for perceived delays.
4
Identify the standard diagnostic workup for the diagnosed condition.
Select complete blood count and ferritin testing.
Breath-holding spells have a strong, well-documented association with iron deficiency anemia, and iron supplementation has been shown to decrease their frequency.

Key Concept

Cyanotic Breath-Holding Spells and Iron Deficiency Anemia
Estimated Time:1m 30s
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Topics

Pediatric Neurologic Disorders

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