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Melena is a form of blood in stool which refers to the dark black, tarry feces that are commonly 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.
A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2] Bismuth found in many antacids may turn stools black as may activated charcoal. [2] Blood from the vagina or urinary tract may also be confused with blood in the stool. [2]
Upper gastrointestinal bleeding (UGIB) is gastrointestinal bleeding in the upper gastrointestinal tract, commonly defined as bleeding arising from the esophagus, stomach, or duodenum. Blood may be observed in vomit or in altered form as black stool. Depending on the amount of the blood loss, symptoms may include shock.
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Dysentery (UK: / ˈ d ɪ s ən t ər i / DISS-ən-tər-ee, [7] US: / ˈ d ɪ s ən t ɛr i / DISS-ən-terr-ee), [8] historically known as the bloody flux, [9] is a type of gastroenteritis that results in bloody diarrhea.
Probiotics & Prebiotic Dog Supplement. Over 1,500 Amazon shoppers agree: The Native Pet Vet-Formulated Probiotics & Prebiotic Dog Supplement is a pooch fave. "This powder is veterinary formulated ...
Blood in stool looks different depending on how early it enters the digestive tract—and thus how much digestive action it has been exposed to—and how much there is. The term can refer either to melena, with a black appearance, typically originating from upper gastrointestinal bleeding; or to hematochezia, with a red color, typically originating from lower gastrointestinal bleeding. [6]
Radiographs (X-rays), usually taken after decompression of the stomach if the dog is unstable, shows a stomach distended with gas. The pylorus, which normally is ventral and to the right of the body of the stomach, is cranial to the body of the stomach and left of the midline, often separated on the X-ray by soft tissue and giving the ...