Melena

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Melena
Other namesMelaena, melæna
Pronunciation
SpecialtyGeneral surgery, gastroenterology
SymptomsDark blood in stool
Causes

Melena or melaena refers to the dark black, tarry feces that are associated with upper gastrointestinal bleeding.[1] The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria.[2]

Pepto-Bismol), or by foods such as beetroot, black liquorice, or blueberries.[4]

Causes

The most common cause of melena is

peptic ulcer disease.[5] However, any bleeding within the upper gastrointestinal tract or the ascending colon can lead to melena.[6] Melena may also be a complication of anticoagulant medications, such as warfarin.[7]

Causes of upper gastrointestinal bleeding that may result in melena include malignant tumors affecting the esophagus, stomach or small intestine, hemorrhagic blood diseases, such as

Causes of "false" melena include

epistaxis), and blood ingested as part of the diet, as with consumption of black pudding (blood sausage), or with the traditional African Maasai diet, which includes much blood drained from cattle.[citation needed
]

Melena is considered a medical emergency as it arises from a significant amount of bleeding. Urgent care is required to rule out serious causes and prevent potentially life-threatening emergencies.

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

Diagnosis

In acute cases, with a large amount of blood loss, patients may present with anemia or low blood pressure. However, aside from the melena itself, many patients may present with few symptoms. Often, the first approach is to use endoscopy to look for obvious signs of a bleed. In cases where the source of the bleed is unclear, but melena is present, an upper endoscopy is recommended, to try to ascertain the source of the bleed.[citation needed]

Lower gastrointestinal bleeding sources usually present with hematochezia or frank blood. A test with poor sensitivity/specificity that may detect the source of bleeding is the tagged red blood cell scan. This is especially used for slow bleeding (<0.5 ml/min). However, for rapid bleeding (>0.5 ml/min), mesenteric angiogram ± embolization is the gold standard. Colonoscopy is often first line, however.[citation needed]

Melena versus hematochezia

Bleeds that originate from the lower gastrointestinal tract (such as the

ligament of Treitz although, as noted below, exceptions occur with enough frequency to render it unreliable.[citation needed
]

Etymology

The origin of melena is dated to the early 19th century via modern Latin, via Greek melaina (feminine of melas, black).[citation needed]

See also

References

External links

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