Which are the symptoms of Superior Mesenteric Artery Syndrome?

Superior Mesenteric Artery Syndrome (SMAS) is a rare digestive disorder characterized by the compression of the third portion of the duodenum between the abdominal aorta and the superior mesenteric artery. The most common symptoms include postprandial abdominal pain, early satiety, nausea, and persistent vomiting, often leading to significant, unintentional weight loss.

What are the most common symptoms of Superior Mesenteric Artery Syndrome?

The clinical presentation of Superior Mesenteric Artery Syndrome typically involves symptoms of upper gastrointestinal obstruction. Because the duodenum is physically compressed, patients often experience intense epigastric pain shortly after eating. Other hallmark symptoms include:

• Chronic postprandial (after-meal) abdominal pain or bloating


• Early satiety (feeling full after only a few bites)


• Nausea and non-bilious or bilious vomiting


• Significant, rapid, and unintentional weight loss


• Visible abdominal distension

How do symptoms vary and impact quality of life?

The severity of Superior Mesenteric Artery Syndrome varies significantly depending on the degree of duodenal compression and the patient's nutritional status. In many cases, patients find relief by changing their position, such as lying on their left side or in a knee-to-chest position, which temporarily relieves the pressure on the duodenum. The most debilitating aspect for our 380 Superior Mesenteric Artery Syndrome community members is the fear of eating, which often leads to a cycle of malnutrition and worsening symptoms, as the loss of mesenteric fat pads further narrows the angle between the arteries, exacerbating the condition.

When should I seek immediate medical attention?

While Superior Mesenteric Artery Syndrome is a chronic condition, certain "red flag" symptoms require urgent evaluation in an emergency setting. Seek immediate care if you experience:

• Inability to tolerate any oral intake or liquids


• Signs of severe dehydration (dizziness, dark urine, or fainting)


• Intense, unremitting abdominal pain that does not resolve with positional changes


• Hematemesis (vomiting blood) or melena (black, tarry stools)

How does Superior Mesenteric Artery Syndrome progress?

If left untreated, Superior Mesenteric Artery Syndrome can lead to severe malnutrition, electrolyte imbalances, and gastric dilation. Over time, the cycle of weight loss and vascular compression can become self-perpetuating. However, with early diagnosis and appropriate nutritional support or surgical intervention, many patients experience significant symptom resolution.

Next steps

• Consult a gastroenterologist or a specialized bariatric surgeon for advanced imaging like a CT angiography.


• Join the Superior Mesenteric Artery Syndrome community at DiseaseMaps.org to connect with others who understand your journey.


• Work with a registered dietitian specializing in malabsorptive disorders to optimize caloric intake.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Superior Mesenteric Artery Syndrome.


• Orphanet: Superior Mesenteric Artery Syndrome (ORPHA:93952).


• National Library of Medicine (PubMed): Clinical reviews on SMA Syndrome diagnostic criteria.