Thursday, May 18, 2017

Mallory-Weiss syndrome

Mild to massive and usually painless bleeding due to a tear in the mucosa or submucosa of the cardia or lower esophagus characterizes Mallory-Weiss syndrome. Such a tear, usually singular and longitudinal, results from prolonged or forceful vomiting. About 60% of these tears involve the cardia; 15%, the terminal esophagus; and 25%, the region across the esophagogastric junction. Mallory-Weiss syndrome is most common in men older than age 40, especially alcoholics.

The direct cause of a tear in Mallory-Weiss syndrome is forceful or prolonged vomiting, probably when the upper esophageal sphincter fails to relax during vomiting. This lack of sphincter coordination is more common after excessive intake of alcohol. Other factors and conditions that may also increase intra-abdominal pressure and predispose to esophageal tearing include coughing, straining during bowel movements, trauma, seizures, childbirth, hiatal hernia, esophagitis, gastritis, and atrophic gastric mucosa.

Signs and symptoms
Typically, Mallory-Weiss syndrome begins with the vomiting of blood or the passing of large amounts of blood rectally a few hours to several days after normal vomiting. This bleeding, which may be accompanied by epigastric or back pain, may range from mild to massive but is generally more profuse than in esophageal rupture.
In patients with Mallory-Weiss syndrome, the blood vessels are only partially severed, preventing retraction and closure of the lumen. Massive bleeding—most likely when the tear is on the gastric side, near the cardia—may quickly lead to fatal shock.

Identifying esophageal tears by fiber-optic endoscopy confirms Mallory-Weiss syndrome. These lesions, which usually occur near the gastroesophageal junction, appear as erythematous longitudinal cracks in the mucosa when recently produced and as raised, white streaks surrounded by erythema when older. Other helpful diagnostic measures include the following:
  • Angiography (selective celiac arteriography) can determine the bleeding site but not the cause; this is used when endoscopy isn’t available.
  • Gastrotomy may be performed at the time of surgery.
  • Hematocrit helps quantify blood loss.
Appropriate treatment varies with the severity of bleeding. Usually, GI bleeding stops spontaneously, requiring supportive measures and careful observation but no definitive treatment. However, if bleeding continues, treatment may include:
  • angiographic infusion of a vasoconstrictor (vasopressin) into the superior mesenteric artery or direct infusion into a vessel that leads to the bleeding artery
  • transcatheter embolization or thrombus formation with an autologous blood clot or other hemostatic material (insertion of artificial material, such as a shredded absorbable gelatin sponge or, less commonly, the patient’s own clotted blood through a catheter into the bleeding vessel to aid thrombus formation)
  • surgery to suture each laceration (for massive recurrent or uncontrollable bleeding).

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