Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Pyelonephritis

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In one line

·Pyelonephritis is when bacteria (usually from the bladder) travel up into the kidney tissue and cause infection there.

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Normal physiology

·The kidneys filter blood and make urine, which flows one way—down the ureters into the bladder and then out—keeping bacteria flushed away and the kidney tissue clean.

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What goes wrong

·Bacteria (usually E. coli from the bowel) travel backward up the ureter and invade the kidney tissue, causing infection and swelling.

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Hallmark signs

·High fever (often 101°F or higher)
·Flank pain (one-sided back pain just below the ribs)
·Chills and shaking
·Nausea and vomiting
·Pain or burning when peeing
·Frequent, urgent need to pee (often only small amounts come out)
·Cloudy or foul-smelling urine
·Blood in the urine (pink, red, or tea-colored)

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Red flags · escalate now

·Confusion, extreme drowsiness, or trouble waking up (may mean bacteria are in the bloodstream, causing sepsis)
·Very low blood pressure, racing heart, or cold, clammy skin (signs of septic shock—the body's circulation is failing)
·Vomiting so severe the person cannot keep down fluids or medicine (risk of dehydration and worsening kidney damage)
·No urine output or very little urine over several hours (the infected kidney may be shutting down)
·Pregnancy (pyelonephritis can trigger early labor and harm the baby; always needs hospital treatment)

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Workup

·Urinalysis with microscopy
·Urine culture and sensitivity
·Blood cultures (two sets from different sites)
·Complete blood count (CBC)
·Basic metabolic panel (BMP) with creatinine
·Serum lactate
·Renal ultrasound or CT scan of the abdomen and pelvis (without and with contrast)
·Pregnancy test (urine hCG) in all women of childbearing age

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Treatment

·Blood cultures (two sets from different sites), then start IV antibiotics within 1 hour — ceftriaxone 1–2 grams IV daily, or ciprofloxacin 400 mg IV every 12 hours if local resistance is low
·IV fluids — 1–2 liters of normal saline or lactated Ringer's over the first few hours, then maintenance fluids to keep urine output above 0.5 mL per kilogram per hour
·Urgent imaging (renal ultrasound or CT scan) and urology consult for drainage if obstruction or abscess is found — percutaneous nephrostomy (a tube through the skin into the kidney) or ureteral stent (a small tube inside the ureter) to bypass the blockage
·Switch to oral antibiotics after fever is gone for 24–48 hours and the patient can eat and drink — ciprofloxacin 500 mg twice daily, or levofloxacin 750 mg once daily, or trimethoprim-sulfamethoxazole if culture shows sensitivity — for a total of 7 days for uncomplicated cases or 10–14 days for complicated cases (pregnancy, diabetes, immunosuppression, or obstruction)
·Hospital admission for IV antibiotics and monitoring for pregnant women, immunocompromised patients (HIV, transplant, chemotherapy), anyone with sepsis signs, or patients who cannot keep down oral antibiotics
·Pain control — acetaminophen 650–1000 mg every 6 hours, or ibuprofen 400–600 mg every 6–8 hours (if kidney function is normal and patient is not dehydrated)
·Follow-up urine culture 1–2 weeks after finishing antibiotics to confirm the infection is cleared

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NCLEX trap

·Pyelonephritis is a kidney infection (bacteria growing in kidney tissue). If the patient has fever, vomiting, or pain when you tap the back over the kidney, admit them to the hospital and start IV antibiotics. Treating by mouth at home is only safe for mild cases who can eat, drink, and have no fever. The danger of missing sepsis (infection spreading into the blood) or a hidden abscess (pocket of pus) is too high.
·Imaging (ultrasound or CT scan) is needed to look for a block (kidney stone, kinked tube from the kidney, or a mass pressing on the tube) or an abscess. If something is blocking the urine, antibiotics alone will fail because they can't reach the trapped infection. The patient will get worse. Find the block early so a urologist can drain it.
·Burning when you pee plus fever is a kidney infection (pyelonephritis) until you prove it's not. Always check for CVA tenderness (pain when you gently tap the back over the kidneys). If that hurts, the infection has climbed from the bladder up into kidney tissue. This changes treatment from pills to IV antibiotics and changes whether the patient needs to be admitted.
·Pregnant women with pyelonephritis must get IV ceftriaxone (a cephalosporin antibiotic that's safe in pregnancy), not a fluoroquinolone. Fluoroquinolones can harm the developing baby (they damage cartilage in growing bones). Pregnancy plus kidney infection equals automatic hospital admission and IV antibiotics. Never treat this at home.
·A stable patient with pyelonephritis who can eat and drink gets pills by mouth (fluoroquinolone or cephalosporin) for 7–14 days at home. A patient with fever, vomiting, or signs of sepsis (fast heart, low blood pressure, confusion) gets IV antibiotics (ceftriaxone or piperacillin-tazobactam) in the hospital. How sick the patient is drives the route and the setting, not just which germ you found.
·Pyelonephritis plus a block (stone, blood clot, or scar narrowing the tube) equals call urology now. Do not wait. The infected urine is trapped behind the stone. Bacteria multiply fast in the stagnant pool. Sepsis and abscesses follow within hours. Urgent stent (a tiny tube to hold the blocked tube open) or nephrostomy (a drain through the skin into the kidney) is the real fix.

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