Gastroenterology

Gastroenterology

Illustration of the stomach, colon and rectum.
System	Gastrointestinal
Significant diseases	Gastrointestinal cancers, Gastrointestinal bleeding
Significant tests	Colonoscopy, Fecal occult blood testing, Barium swallows, Endoscopy
Specialist	Gastroenterologist

Gastroenterology (MeSH heading)^[1] is a branch of medicine focused on the digestive system and its disorders. In the United States, gastroenterology is an internal medicine subspecialty certified by the American Board of Internal Medicine (ABIM) and the American Osteopathic Board of Internal Medicine (AOBIM).

mouth to anus, along the alimentary canal, are the focus of this specialty. Physicians practicing in this field are called gastroenterologists. They have usually completed eight years of pre-medical and medical education, a year-long internship (if this is not a part of the residency), three years of an internal medicine residency, and two to three years in the gastroenterology fellowship. Some gastroenterology trainees will complete a "fourth-year" (although this is often their 7th year of graduate medical education) in transplant hepatology, advanced endoscopy, inflammatory bowel disease (IBD), motility or other topics.

Hepatology, or hepatobiliary medicine, encompasses the study of the liver, pancreas, and biliary tree, and is traditionally considered a sub-specialty.

History

Drawings of Bozzini's "Lichtleiter"

Citing from Egyptian papyri, Nunn identified significant knowledge of gastrointestinal diseases among practising physicians during the periods of the pharaohs. Irynakhty, of the tenth dynasty, c. 2125 B.C., was a court physician specialising in gastroenterology, sleeping, and proctology.^[2]

Among ancient Greeks, Hippocrates attributed digestion to concoction. Galen's concept of the stomach having four faculties was widely accepted up to modernity in the seventeenth century.

Eighteenth century:

• Italian Lazzaro Spallanzani (1729–99) was among early physicians to disregard Galen's theories, and in 1780 he gave experimental proof on the action of gastric juice on foodstuffs.
• In 1767, Johann von Zimmermann wrote an important work on dysentery.
• In 1777, Maximilian Stoll of Vienna described cancer of the gallbladder.^[3][4]

Nineteenth century:

• In 1805, Philipp Bozzini made the first attempt to observe inside the living human body using a tube he named Lichtleiter (light-guiding instrument) to examine the urinary tract, the rectum, and the pharynx. This is the earliest description of endoscopy.^[5][6]
• Charles Emile Troisier described enlargement of lymph nodes in abdominal cancer.^[7]
• In 1823, William Prout discovered that stomach juices contain hydrochloric acid.^[8]
• In 1868, Adolf Kussmaul, a well-known German physician, developed the gastroscope. He perfected the technique on a sword swallower.
• In 1871, at the society of physicians in Vienna, Carl Stoerk demonstrated an esophagoscope made of two telescopic metal tubes, initially devised by Waldenburg in 1870.
• In 1876, Karl Wilhelm von Kupffer described the properties of some liver cells now called Kupffer cell.
• In 1883, Hugo Kronecker and Samuel James Meltzer studied oesophageal manometry in humans.

McClendon's pH-probe

Twentieth century:

• In 1915, Jesse McClendon tested acidity of human stomach in situ.^[9]
• In 1921-22, Walter Alvarez did the first electrogastrography research.^[10]
• Georg Wolf developed a semiflexible gastroscope in 1932.
• In 1932, Burrill Bernard Crohn described Crohn's disease.
• In 1957, Basil Hirschowitz introduced the first prototype of a fibreoptic gastroscope.

Twenty-first century:

• In 2005, Barry Marshall and Robin Warren of Australia were awarded the Nobel Prize in Physiology or Medicine for their discovery of Helicobacter pylori (1982/1983) and its role in peptic ulcer disease. James Leavitt assisted in their research, but the Nobel Prize is not awarded posthumously so he was not included in the award.

The word gastroenterology is a combination of three Ancient Greek words: γαστήρ gaster (gen.: gastros) "stomach", ἔντερον enteron "intestine", and λόγος logos "reason".

Disease classification

1. International Classification of Disease (ICD 2007)/WHO classification:

• Chapter XI,Diseases of the digestive system,(K00-K93)[1]

2. MeSH subject Heading:

• Gastroenterology (G02.403.776.409.405)[2]
• Gastroenterological diseases(C06.405)[3]

3. National Library of Medicine Catalogue (NLM classification 2006):

• Digestive system(W1)[4]

Gastroenterological societies

• World Gastroenterology Organisation
• American College of Gastroenterology
• American Gastroenterological Association
• American Society for Gastrointestinal Endoscopy
• British Society of Gastroenterology

Research resources

• Annals of Gastroenterology & Hepatology
• Scandinavian Journal of Gastroenterology

References

External links

• Publications/Journals at DMOZ
• GastroHep - global online resource for gastroenterology
• The Digital Atlas of Video Education - Gastroenterology
• Elms Digestive-Gastroenterologists