Download or read book Mayo Clinic Illustrated Textbook of Neurogastroenterology written by Michael Camilleri and published by Oxford University Press. This book was released on 2021 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Studying rare genetic and molecular diseases of gut motility provides an understanding of their underlying mechanisms and may provide insights on the mechanisms or management of more common illnesses. For example, constipation affects 1 in 5 people 65 years or older and 1 in 10 people younger than 65 years, and slow-transit constipation or colonic inertia is responsible for approximately 10% of referrals of patients with constipation to gastroenterologists and, among all patients with constipation, is the cause in probably 1%. Insights on the pathophysiology and mechanisms of constipation are provided by studying Hirschsprung disease, mitochondrial cytopathy, or multiple endocrine neoplasia type 2B. These diseases are used to illustrate the congenital diseases of the enteric neuromuscular apparatus"--