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Postoperative Ileus

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In one line

·In Postoperative A stalled gut (Ileus), the bedside team that sees the cluster early — vitals plus exam plus one targeted study — outperforms the team that waits for a broad panel.

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Normal physiology

·The bowel wall is wrapped in smooth muscle that squeezes in waves (peristalsis) to push food, liquid, and gas from stomach to rectum. That squeeze is controlled by a mesh of nerves inside the bowel wall (the enteric nervous system, sometimes called the gut's own brain) and by signals from the vagus nerve (the main highway from the brainstem to the belly). The smooth muscle also needs the right balance of electrolytes — especially potassium, magnesium, and calcium — to contract smoothly. At rest, the bowel has plenty of reserve power; it can speed up or slow down depending on what you eat and how you move.

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What goes wrong

·In postoperative a stalled gut (ileus), the nerve signals that tell the bowel to squeeze are turned down or blocked, so the smooth muscle sits still even though there is no physical obstruction. Surgery triggers inflammation in the belly, anesthesia drugs suppress the enteric nervous system, opioid pain pills lock the muscle in a relaxed state, and direct handling of the bowel during the operation stuns the local nerves. The result is that the gut's squeezing waves (peristalsis) stops and the bowel becomes a floppy, quiet tube that cannot push anything forward.

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Hallmark signs

·Belly bloating and feeling full
·Nausea and vomiting
·No passing gas or stool
·Crampy belly pain that comes and goes
·Quiet or absent bowel sounds when the doctor listens with a stethoscope
·Loss of appetite
·Fever above 101°F (38.3°C) that starts or gets worse
·Severe, constant, sharp belly pain instead of crampy pain

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Red flags · escalate now

·Fever above 101°F, especially if it starts after post-op day 3 or keeps climbing — may mean infection, abscess, or bowel leak.
·Severe, constant, sharp belly pain instead of crampy waves — suggests peritonitis, perforation, or dying bowel tissue.
·Fast heart rate over 110, low blood pressure, or confusion — signs the body is losing the fight against infection or bleeding.
·Belly becomes hard, rigid, and very tender to touch — classic for a perforated bowel spilling contents into the abdomen.
·Vomiting fecal-smelling or dark brown material — means a complete bowel blockage is backing contents all the way up from the colon.

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Workup

·Complete blood count (CBC) with differential
·Basic metabolic panel (BMP): sodium, potassium, chloride, bicarbonate, BUN, creatinine, glucose
·Abdominal X-ray (supine and upright or lateral decubitus)
·CT abdomen and pelvis with IV contrast
·Serum lactate
·Magnesium level

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Treatment

·NPO (nothing by mouth) + nasogastric tube decompression if vomiting or severe distension
·Early mobilization: sitting in chair and walking within hours of surgery if blood pressure and pain allow
·Minimize opioids; use non-opioid analgesia (acetaminophen, NSAIDs if kidneys allow, regional nerve blocks or epidural without high-dose opioids) and taper opioid dose as soon as pain control permits
·Correct electrolytes: replete potassium to > 4.0 mEq/L and magnesium to > 2.0 mg/dL
·IV fluids to maintain euvolemia (normal fluid balance); avoid both dehydration and fluid overload
·Encourage oral intake (sips of water, then clear liquids, then soft diet) as soon as nausea allows and bowel sounds return; feed the gut to wake it up
·Consider alvimopan (12 mg PO twice daily starting before surgery and continued up to 7 days) in patients undergoing bowel resection

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NCLEX trap

·Keep the patient NPO (nothing by mouth) and let the gut rest until bowel function returns, because feeding too early in postoperative a stalled gut (ileus) causes vomiting and worsens bloating. Wait for signs the gut is waking up — passing gas, bowel sounds, and less nausea — before you offer even sips of clear liquid.
·Use pain and nausea control carefully in postoperative a stalled gut (ileus) because opioid pain medicines (like morphine, hydromorphone, or oxycodone) actually slow the gut down even more by blocking the natural squeeze-and-relax rhythm of the intestines. Use the smallest dose that works, and consider non-opioid options (like acetaminophen or ketorolac) when safe.
·Start with a focused physical exam and a simple upright abdominal X-ray for postoperative a stalled gut (ileus); save the big CT scan for when you suspect a surgical emergency like a hole in the intestine (perforation), a twisted loop of bowel (volvulus), or a section of bowel that has lost its blood supply (strangulation). The X-ray shows air-fluid levels and dilated loops, which is what you expect in a stalled gut; the CT is for when something more dangerous might be hiding.
·Try conservative care first — walking, early mobilization, and sips of clear fluids when the patient is ready — and place an NG tube only if the patient cannot stop vomiting, cannot tolerate any fluids by mouth, or if the belly becomes so tight and distended that it threatens breathing or wound healing. The tube is a rescue tool, not a first move.
·A low-grade fever (up to 100.4–101°F or 38–38.3°C) and a stalled gut (ileus) are expected in the first 24–48 hours after surgery as a normal stress response; look for a real source of infection (wound redness and pus, cough and abnormal chest X-ray for pneumonia, tenderness along the IV line) rather than blaming postoperative a stalled gut alone for the fever. If the fever is higher, lasts longer than 48 hours, or the patient looks sick, then you investigate.
·Actively manage postoperative a stalled gut (ileus) with early mobilization (get the patient up and walking as soon as safe, ideally within 6–12 hours after surgery), avoid unnecessary sedation, minimize opioid pain medicines, offer gum chewing (which can stimulate the vagus nerve and wake up the gut), and teach the patient what to expect so they know when things are getting better (passing gas, bowel sounds, less bloating) or worse (severe pain, fever, no improvement by day 5).

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