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Malaena

Overview

  • Malaena refers to the passing of jet black, tarry, sticky, foul-smelling stools. This symptom is highly suggestive of upper GI bleeding.

Aetiology

    • Causes of Malaena

    • Oesophageal - varices, AVM, tumour, oesophagitis, Mallory-Weiss tear
    • Gastric- gastritis, gastric ulcer, gastric carcinoma, hiatus hernia
    • Duodenal - duodenal ulcer, duodenitis
  • Note that iron and bismuth-containing medications can cause stools with a similar appearance to malaena.

History of Presenting Complaint

    • Stools

    • Ask about the appearance and smell of the stools to ascertain whether they in fact represent malaena.
    • Onset

      Under what circumstances the dark stools began.
    • Onset after recently commencing iron supplementsUnlikely to represent true malaena
    • Onset after protracted vomitingSuggestive of Mallory-Weiss tear
    • Timing

    • How long the patient has noticed the dark stools for.
    • Associated Symptoms

      Whether the dark stools have been associated with any other symptoms.
    • Coffee-ground vomitingSuggestive of peptic ulceration with slow bleed
    • Epigastric painSuggestive of gastritis, peptic ulcer or oesophagitis
    • Prolonged heartburnSuggestive of oesophagitis

Extra Credit

    • Rare Causes of Gastrointestinal Bleeding

    • Cameron lesions: linear erosions / ulcerations found at the subdiaphragmatic end of a hiatus hernia
    • Dieulafoy leisons: congenitally superficial arteries within the mucosa / submucosa that erode and bleed with minor trauma
    • Cancer of the small intestine
    • Varices (non-oesophageal)- small intestine, colon, rectum, peristomal, gallbladder, bile duct, pancreasPortal hypertension
    • Haemosuccus pancreaticus: bleeding from the pancreas into the ampulla of VaterPancreatitis, malignancy, trauma, arteriovenous malformation
    • Haemobilia: bleeding from the biliary systemIatrogenic, trauma, malignancy, hepatic abscess / cyst, arteriovenous malformation
    • Aortoenteric fistula
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Associated Diseases
BETA

Gastric & Small Bowel
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