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Encyclopedia > Melena

In medicine, melena or melaena refers to the black, "tarry" feces that are associated with gastrointestinal hemorrhage. The black color is caused by oxidation of the iron in hemoglobin during its passage through the ileum and colon. Medicine on the Web NLM (National Library of Medicine, contains resources for patients and healthcare professionals) Virtual Hospital (digital health sciences library by the University of Iowa) Online Medical Dictionary Collection of links to free medical resources Categories: Medicine | Health ... Rabbit feces are usually 0. ... Hemorrhage (alternate spelling is Haemorrhage) is the medical term referring to the presence of blood in the interstitial tissues. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... 3-dimensional structure of hemoglobin Hemoglobin or haemoglobin (frequently abbreviated as Hb, PDB 1A3N) is the iron-containing oxygen-transport metalloprotein in the red cells of the blood in mammals and other animals. ... In anatomy of the digestive system, the ileum (not to be confused with the ilium, a pelvic bone), is the final section of the small intestine. ... In anatomy of the digestive system, the colon or large intestine is the part of the intestine from the cecum to the rectum. ...

Bleeding originating from the lower GI tract (such as the sigmoid colon and rectum) is generally associated with the passage of bright red blood, or hematochezia, particularly when brisk. Blood acts as a cathartic agent in the intestine, promoting its prompt passage. Only blood that originates from a high source (such as the small intestine), or bleeding from a lower source that occurs slowly enough to allow for oxidation, is associated with melena. For this reason, melena is often associated with hemorrhage in the stomach or duodenum (upper gastrointestinal tract), for example by a peptic ulcer. The sigmoid colon is the part of the large intestine after the descending colon and before the rectum. ... The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx. ... Hematochezia is the passage of bright red blood from the rectum, with or without feces. ... Catharsis is a sudden emotional breakdown or climax that constitutes overwhelming feelings of great pity, sorrow, laughter, or any extreme change in emotion that results in the renewal, restoration and revitalization for living. ... Diagram showing the poop shoot In biology the small intestine is the part of the gastrointestinal tract between the stomach and the large intestine (colon). ... Hemorrhage (alternate spelling is Haemorrhage) is the medical term referring to the presence of blood in the interstitial tissues. ... In anatomy, the stomach (in ancient Greek στόμαχος) is an organ in the alimentary canal used to digest food. ... In anatomy of the digestive system, the duodenum is a hollow jointed tube that connects the stomach to the jejunum. ... I LOVE BIBI ...

If a source in the upper GI tract is suspected, an upper endoscopy is usually performed to diagnose the cause. Lower GI bleeding sources may be detected by tagged red blood cell scan or mesenteric angiogram. In medicine (gastroenterology), esophagogastroduodenoscopy (EGD) or upper endoscopy is a diagnostic endoscopic procedure that visualises the upper part of the gastrointestinal tract. ...

The most common cause of melena is peptic ulcer disease. Any other cause of bleeding from the upper gastro-intestinal tract, or even the ascending colon, can also cause melena.

It is usually a medical emergency because it is a sign that a patient/animal is losing blood into the gastro-intestinal tract. This bleeding may be torrential and difficult to control.

A less serious, self-limiting case of melena can occur in newborns two to three days after delivery, due to swallowed maternal blood.

  Results from FactBites:
Melena's Biography (606 words)
Shaped from the rhythms that dance through her veins, Melena, born in Havana, Cuba, has mastered the traditional rhythms that have traveled from Africa to Cuba, to the dance floors of America.
Melena’s formal training began on the drums when she was a teenager.
Melena’s goal is to finish an album of her own and travel the world, also to be a major contributor to the Afro/Cuban music legacy, sharing the richness of this culture with others.
  More results at FactBites »



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