Superior mesenteric artery syndrome associated with recurrent aspiration and difficult ventilator liberation in a post-trauma patient: a case report

In the intensive care unit, the body is often a battlefield where injuries from the outside collide with the fragile machinery of the inside. When a patient survives a severe accident, the immediate focus is on saving the brain and the heart, but the digestive system can quietly become a source of new trouble. Sometimes, the very act of trying to feed a patient who cannot eat on their own triggers a chain reaction that keeps them trapped in a hospital bed. This happens when the stomach fills with air and fluid, pushing upward against the lungs, or when the stomach contents are vomited back up and accidentally breathed into the airways. This cycle of vomiting and breathing in food particles, known as aspiration, can cause severe pneumonia and make it impossible to take a patient off a breathing machine. Doctors have long known that the body's ability to move food through the gut can fail after trauma, but they are still learning how to spot the specific mechanical traps that cause this failure and how to untangle them without resorting to major surgery.

This story begins with a nineteen-year-old man from Saudi Arabia who survived a devastating road traffic accident. He had suffered a severe injury to his brain, requiring surgery to relieve pressure, a tube to drain fluid from his brain, and a tracheostomy to help him breathe. He also had a broken arm that needed fixing. When he arrived at the critical care unit for long-term support, he was awake enough to be rated as having a low level of consciousness, but his body was stable. He had a tube in his stomach to deliver nutrition, yet he could not keep food down. For nearly a year, he remained dependent on a ventilator, a machine that breathed for him. During this time, medical staff tried five different times to wean him off the machine, hoping to let him breathe on his own. Each attempt ended in failure. Every time they tried to reduce the machine's support, the patient would vomit. This vomiting led to food particles entering his lungs, causing new infections and pneumonia, which forced the doctors to put him back on the machine immediately.

The turning point came when a doctor noticed something unusual on a routine X-ray of the patient's chest. While looking at the lungs, the doctor saw that the stomach was massively swollen with gas, filling a large portion of the upper abdomen. This was not just a sign of a slow stomach; it was a clue that something was physically blocking the exit. The medical team ordered a detailed scan of the abdomen to see what was happening inside. The images revealed a rare condition where the third part of the small intestine, called the duodenum, was being squeezed shut. This section of the gut was trapped between two major blood vessels: the aorta, which carries blood from the heart, and the superior mesenteric artery, which supplies blood to the intestines. Normally, a cushion of fat sits between these vessels to keep them apart, but in this patient, the loss of that fat pad, likely due to the long illness and trauma, allowed the vessels to pinch the intestine like a pair of pliers. This blockage prevented food and air from passing through, causing the stomach to balloon up and forcing the patient to vomit repeatedly.

The diagnosis was a mechanical obstruction known as superior mesenteric artery syndrome. The doctors realized that as long as this blockage remained, the patient would continue to vomit, and as long as he kept vomiting, he would keep getting pneumonia and failing to breathe on his own. The solution did not require cutting open the abdomen to move the blood vessels. Instead, the team used an endoscope, a flexible camera, to thread a new feeding tube through the existing stomach tube. They guided this new tube past the point of the pinch, placing its tip deep in the small intestine, well beyond the obstruction. This new path, known as a PEG-J, allowed them to feed the patient directly into the intestine, bypassing the blocked section entirely.

The results were immediate and dramatic. Once the feeding tube was in place, the vomiting stopped completely. The patient could finally tolerate nutrition without the stomach becoming distended. Within one week of this simple adjustment, the patient was successfully taken off the ventilator. He had been struggling for twelve months, but the removal of the vomiting cycle allowed his lungs to clear and his breathing to stabilize. He remained off the breathing machine for a full year of follow-up, with no return of the vomiting or the aspiration pneumonia.

This case highlights a critical lesson for doctors treating patients with severe brain injuries or trauma. When a patient cannot be weaned off a breathing machine and keeps vomiting, the cause is not always in the lungs or the brain. Sometimes, the problem is a mechanical squeeze in the gut that can be fixed by changing how food is delivered. The doctors in this report did not claim that the syndrome was the only reason the patient struggled for a year; the severe brain injury and long hospital stay certainly played a role. However, the timing of the recovery strongly suggests that the vomiting caused by the blocked intestine was a major, reversible barrier to breathing on his own. By identifying the blockage and routing nutrition around it, the team removed the obstacle that had kept the patient trapped, proving that sometimes the key to freeing a patient from a machine is as simple as finding a new path for their food.