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Zorluk: ZorPediatric Neurologic Disorders

An 18-month-old girl is brought to the pediatric neurology clinic by her parents due to ongoing concerns about her development and a recent "shaking episode." Yesterday, the child experienced a 1-minute generalized tonic-clonic seizure that resolved spontaneously. The parents report that over the past 4 months, the patient has completely stopped speaking the few words she knew (e.g., "mama," "dada") and no longer attempts to feed herself. Instead, she spends most of her day repetitively wringing and clasping her hands. Her past medical history is notable for normal development until 12 months of age. Additionally, she has had clear rhinorrhea for the past 2 days. On examination, the patient's temperature is 37.1°C (98.8°F), heart rate is 108/min, and respiratory rate is 22/min. The lungs are clear to auscultation bilaterally. Neurologic examination reveals a wide-based, unsteady gait and an absent pincer grasp. Review of her pediatric growth chart demonstrates that her head circumference has dropped from the 50th percentile at age 12 months to the 5th percentile currently, whereas her length and weight have remained on the 50th percentile curves. Which of the following is the most appropriate next step in the management of this patient?

  1. Order an electroencephalogram and molecular genetic testing for an X-linked dominant mutationCevap
  2. B
    Reassure the parents that transient delays are normal during mild childhood illnesses and schedule a routine follow-up
  3. C
    Administer nebulized albuterol and oral dexamethasone for reactive airway disease
  4. D
    Admit the patient for immediate empiric therapy with intravenous ceftriaxone and vancomycin
  5. E
    Submit a formal malpractice grievance against the primary care physician for missing the diagnosis

Cevap

Order an electroencephalogram and molecular genetic testing for an X-linked dominant mutation.
The correct answer involves initiating the diagnostic workup for Rett syndrome. The patient's clinical presentation of normal early development followed by regression of language and purposeful motor skills, the emergence of stereotypic hand-wringing movements, acquired microcephaly, and new-onset seizures is highly characteristic of this condition. Rett syndrome is an X-linked dominant neurodevelopmental disorder caused almost exclusively by mutations in the MECP2 gene. The most appropriate next step in management is confirming the diagnosis with targeted molecular genetic testing and obtaining an electroencephalogram (EEG) to evaluate the new-onset seizure activity.

Adım Adım Çözüm

1
Analyze the patient's developmental history.
The patient had normal development until 12 months, followed by a profound regression in language and motor skills (loss of words and purposeful hand use).
Identifying developmental regression is a critical "red flag" that requires immediate targeted neurologic and genetic evaluation, ruling out simple developmental delay.
2
Evaluate the physical examination and growth chart findings.
The patient exhibits stereotypic hand-wringing movements, gait ataxia, and acquired microcephaly (head circumference dropped from 50th to 5th percentile).
The triad of acquired microcephaly, developmental regression, and stereotypic hand movements strongly points to a specific genetic syndrome rather than an infectious or purely structural brain lesion.
3
Synthesize the findings to establish the most likely diagnosis.
The clinical picture is classic for Rett syndrome.
Rett syndrome affects almost exclusively females and classically presents between 6-18 months of age with developmental plateau followed by rapid regression.
4
Determine the appropriate diagnostic management step.
Targeted molecular testing for MECP2 mutation (an X-linked dominant condition) and an EEG.
Genetic confirmation is required for a definitive diagnosis of Rett syndrome, and an EEG is necessary to characterize and manage the concurrent new-onset seizures.

Anahtar Kavram

Diagnosis and management of Rett syndrome, an X-linked dominant neurodevelopmental disorder caused by MECP2 mutations.
Tahmini Süre:1m 30s
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Pediatric Neurologic Disorders

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