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DiGeorge Syndrome Explained | 22q11.2 Deletion Syndrome, Clinical Features & Management | Pediatrics
DiGeorge Syndrome, also known as 22q11.2 Deletion Syndrome or Velocardiofacial Syndrome, is a congenital disorder caused by a microdeletion on chromosome 22q11.2, resulting in abnormal development of the third and fourth pharyngeal pouches. It is one of the most important topics in pediatrics, immunology, genetics, embryology, cardiology, and endocrinology and is frequently tested in MBBS, FMGE, NEET PG, INI-CET, USMLE, and PLAB examinations. In this comprehensive lecture, Dr. Parv explains DiGeorge Syndrome in a simple, clinical, and exam-focused manner, covering its genetics, embryology, pathophysiology, clinical presentation, diagnosis, complications, and management. Learn how defective embryological development leads to thymic hypoplasia, parathyroid hypoplasia, congenital cardiac defects, immunodeficiency, and characteristic craniofacial abnormalities.
This lecture provides a detailed understanding of the classic features remembered by the "CATCH-22" mnemonic: Cardiac defects, Abnormal facies, Thymic hypoplasia, Cleft palate, and Hypocalcemia due to chromosome 22q11 deletion. The discussion explains the underlying T-cell immunodeficiency, recurrent viral, fungal, and opportunistic infections, neonatal hypocalcemic tetany, conotruncal cardiac anomalies such as Tetralogy of Fallot, Truncus Arteriosus, Interrupted Aortic Arch, and Ventricular Septal Defect, feeding difficulties, developmental delay, learning disabilities, psychiatric disorders, and autoimmune diseases. High-yield concepts related to laboratory investigations, lymphocyte subset analysis, calcium and parathyroid hormone evaluation, fluorescence in situ hybridization (FISH), chromosomal microarray testing, differential diagnosis, and important embryological correlations are integrated throughout the lecture.
In addition, the lecture covers evidence-based management including calcium and vitamin D supplementation, management of congenital heart disease, treatment and prevention of infections, immunological evaluation, thymus transplantation in selected patients, multidisciplinary care, genetic counseling, long-term follow-up, and prognosis. This video is highly beneficial for MBBS students , medical graduates ⚕, pediatric residents , immunology learners , genetics learners , cardiology learners ❤, USMLE aspirants , PLAB candidates , FMGE aspirants , NEET PG aspirants , nursing students ⚕, and healthcare professionals preparing for clinical practice and competitive examinations. Watch till the end for high-yield exam pearls ⭐, clinical insights , and frequently tested concepts related to chromosome 22q11 deletion, primary immunodeficiency, congenital heart disease, embryology, pediatric genetics, and clinical medicine.
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