An 8-year-old child with “elfin” facial features is very friendly with strangers. He has a history of mild mental retardation, and a hemizygous deletion on chromosome 7q11.23, that includes a portion of the elastin gene. Which of the following is most likely true in this patient?
Carpopedal spasm induced by sphygmomanometer inflation
Vitamin D supplementation is recommended
Symptoms may develop secondary to left ventricular outflow tract obstruction
This patient is less likely to experience angina