Sengstaken–Blakemore tube is a temporary measure: ulceration and rupture of the esophagus and stomach are recognized complications. A related device with a larger gastric balloon capacity (about 500 ml), the Linton–Nachlas tube, is used for bleeding gastric varices. It does not have an esophageal balloon. It is named for Robert William Sengstaken Sr. (1923–1978), an American neurosurgeon, and Arthur Blakemore (1897–1970), an American vascular surgeon. They conceptualized and invented the tube in the early 1950s. Sengstaken–Blakemore tube A Sengstaken–Blakemore tube is a medical device inserted through the nose or mouth and used occasionally in the management of upper gastrointestinal hemorrhage due to
Embryological origins of the mouth and anus that the structures are equivalent homologous, and that the older ideas about protostome mouth formation were correct. An alternative way to develop two openings from the blastopore during gastrulation, called amphistomy, appears to exist in some animals, such as nematodes. In many animals these early development stages later evolved in ways that no longer reflect these original patterns. For instance, humans have already formed a gut tube at the time of formation of the mouth and anus. Then the mouth is formed first, during the fourth week of development, and the anus is created four weeks later, temporarily forming a