During a routine well-child visit, a pediatrician evaluates a 15-month-old girl due to parental concerns regarding her development. She is currently unable to stand with support and exhibits minimal vocalizations. Physical examination reveals several dysmorphic features, including a broad nasal bridge, low-set ears, and a single transverse palmar crease. The physician suspects an underlying genetic etiology. Arrange the following steps in the diagnostic evaluation and management of this patient in the most appropriate sequential order, progressing from initial clinical assessment to definitive management.
- 1Obtain a comprehensive three-generation family pedigree and detailed prenatal history.
- 2Order a chromosomal microarray analysis (CMA) as the first-tier molecular test.
- 3Pursue whole-exome sequencing (WES) or a targeted gene panel.
- 4Coordinate multidisciplinary care and genetic counseling based on the specific molecular diagnosis.
Cevap
The correct sequence begins with a detailed family and prenatal history, followed by chromosomal microarray analysis (CMA) as the first-tier test, whole-exome sequencing (WES) if CMA is unrevealing, and concludes with targeted multidisciplinary management once a definitive diagnosis is established.
The evaluation of a child with global developmental delay and dysmorphic features requires a stepwise approach. It must begin with a thorough history (including a three-generation pedigree). Current pediatric genetics guidelines strongly recommend chromosomal microarray analysis (CMA) as the first-tier test for unexplained developmental delay and multiple congenital anomalies, as it detects microscopic copy number variants that a standard karyotype would miss. If CMA is non-diagnostic, second-tier testing such as whole-exome sequencing is then pursued. Finally, diagnosis-specific multidisciplinary management and family counseling are implemented.
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Anahtar Kavram
Chromosomal microarray analysis (CMA) is the first-line genetic test for children presenting with unexplained global developmental delay and dysmorphic features.