RT Book, Section A1 Bissonnette, Bruno A1 Luginbuehl, Igor A1 Engelhardt, Thomas SR Print(0) ID 1164061308 T1 Allan-Herndon-Dudley Syndrome (AHDS) T2 Syndromes: Rapid Recognition and Perioperative Implications, 2e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781259861789 LK accessanesthesiology.mhmedical.com/content.aspx?aid=1164061308 RD 2024/10/09 AB Most affected neonates and infants with this disorder appear to develop normally in the first few months of life; however, the presence of poor muscle tone is most often already present at birth. By the age of 6 months, hypotonia with the inability to hold up the head and severe muscle atrophy become obvious. In addition, severe mental retardation and multiple congenital anomalies are present.