Sevelamer-associated gastrointestinal mucosal injury with bleeding and Enterococcus faecalis peritonitis in a peritoneal dialysis patient: a case report
This case report describes a rare instance where sevelamer-induced colonic ulceration and bleeding in a peritoneal dialysis patient led to Enterococcus faecalis peritonitis, underscoring the critical need to evaluate the gastrointestinal tract alongside the peritoneal cavity when such patients present with abdominal pain and cloudy dialysate.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
When the kidneys fail, the body loses its ability to filter waste and balance essential minerals, a condition known as end-stage kidney disease. Without treatment, dangerous levels of phosphate build up in the blood, weakening bones and damaging blood vessels. To manage this, patients often take phosphate binders, medications that act like sponges in the digestive tract to soak up phosphate from food before it enters the bloodstream. One of the most common of these binders is sevelamer, a drug that does not contain calcium and is generally considered safe and well-tolerated. However, like any medication, it carries risks that are not always immediately obvious, particularly when it interacts with the delicate lining of the gut. Understanding how a standard treatment can occasionally turn into a source of severe injury is vital for doctors and patients alike, as it highlights the complex relationship between managing a chronic illness and the unintended consequences of the therapies used to treat it.
In a recent case report, a team of physicians described a rare and dangerous complication involving a young woman undergoing peritoneal dialysis, a treatment where the abdomen is used to filter blood. The patient, a twenty-four-year-old woman, arrived at the emergency department suffering from sharp abdominal pain, dark stools indicating internal bleeding, and a sudden inability to perform her daily dialysis treatments. Her dialysis fluid, which should be clear, had turned cloudy, and her blood tests revealed severe anemia, with a hemoglobin level as low as 4.9 grams per deciliter. While the cloudy fluid and pain initially suggested an infection of the abdominal lining, known as peritonitis, the presence of dark stool and the specific nature of her pain pointed toward a problem within the digestive tract itself.
Upon admission, the medical team immediately stopped the patient's sevelamer medication and began a thorough investigation. A scan of her abdomen showed that the wall of her colon, specifically from the beginning to the middle section, had become thickened and inflamed. To see what was happening inside, doctors performed a colonoscopy, a procedure that uses a camera to view the interior of the colon. They discovered multiple shallow sores, or ulcers, in the cecum, which is the first part of the large intestine. When a small piece of tissue was taken from these sores for examination under a microscope, the pathologists found something distinct: broad, curved crystals with a unique, fish-scale pattern. These were identified as sevelamer crystals, confirming that the medication itself had caused direct injury to the intestinal lining.
The situation was further complicated by an infection. Once the patient's dialysis catheter began working again, fluid collected from her abdomen was tested and found to contain Enterococcus faecalis, a type of bacteria that normally lives in the intestines. The medical team reasoned that the damage caused by the sevelamer crystals had likely broken down the natural barrier of the intestinal wall, allowing these gut bacteria to leak into the sterile space where the dialysis fluid circulates, causing the peritonitis. The patient was treated with antibiotics delivered directly into her abdomen and was switched to a different phosphate binder called ferric citrate. After eight days in the hospital, she was discharged, still receiving antibiotics, with her condition stabilizing as the intestinal injury began to heal.
This case serves as a critical reminder for medical professionals that symptoms in dialysis patients should not be attributed to a single cause without a full investigation. When a patient on peritoneal dialysis presents with abdominal pain and cloudy fluid, the immediate assumption is often an infection. However, if signs of gastrointestinal bleeding or colitis are also present, doctors must consider that a medication like sevelamer could be the root cause of the injury. The authors of the report emphasize that recognizing this possibility early allows for the timely discontinuation of the offending drug and targeted treatment of both the gut injury and the resulting infection, preventing the situation from escalating into life-threatening complications such as bowel perforation or severe, uncontrollable infection. The findings suggest that while sevelamer is a valuable tool for many, it requires careful monitoring, as its crystals can rarely inflict significant harm on the digestive system.
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