]> 2026-07-31T09:41:36+00:00 WBR0609 0 en Multivitamin preparation Williams syndrome is characterized by hypercalcemia, which is thought to be caused by high sensitivity to vitamin D. Since all pediatric multivitamin preparations contain vitamin D, the patient's hypercalcemia will worsen with the administration of multivitamin supplements. Iron supplement Iron supplementation does not affect patients with Williams syndrome. Magnesium supplement Magnesium supplementation does not affect patients with Williams syndrome. Fluoride supplement Fluoride supplementation does not affect patients with Williams syndrome. Zinc supplement Patients with diarrhea may be supplied zinc. Although not needed in this patient, zinc supplementation is not generally contraindicated in patients with Williams syndrome. Genetics A 4-year-old boy with mild mental retardation is brought to the pediatrician's office for chronic constipation. The patient does not report any symptoms, and his mother states that he has a regular and balanced diet. On physical examination, the child has abnormal facies and exhibits cheerful and friendly demeanor. He has a bulge forehead, a low nasal bridge, and an abnormally wide mouth. His blood pressure is 152/88 mmHg, heart rate is 82/min, and temperature is 36.8 °C (98.2 °F). Cardiac auscultation is remarkable for a grade II/VI, mid-systolic ejection murmur at the right upper sternal border. Echocardiography with Doppler flow studies demonstrates supravalvular aortic stenosis. Lab work-up is remarkable for serum calcium concentration of 11.2 mg/dL. Which of the following supplements is contraindicated in this patient? A Cardiology Endocrine Neurology 2020-10-28T01:09:37Z 2459150.5483449 WBR0609