Compare conditions

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

Mis C

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In one line

·A post-COVID immune storm in kids that attacks the blood vessels and heart, usually 2–6 weeks after the infection clears.

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Normal physiology

·Normally after any virus—flu, cold, or COVID—the immune system ramps up, kills the invader, then gets the signal to stand down and go quiet again. The blood vessels stay strong and sealed, the heart pumps steadily, and inflammation fades within days.

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What goes wrong

·In MIS-C, the immune off-switch fails. Instead of calming down after COVID is gone, the immune system keeps making alarm chemicals and starts attacking the child's own blood-vessel lining and heart. Certain genes and the way the virus looked to the immune system seem to trip this misfire, though doctors are still learning exactly why.

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Hallmark signs

·Fever lasting 24 hours or longer (100.4°F / 38°C or higher)
·Belly pain, diarrhea, or throwing up
·Red, bloodshot eyes without pus (conjunctivitis)
·Skin rash or bright red, cracked lips and tongue (strawberry tongue)
·Swollen hands and feet
·Fast heart rate (tachycardia) or chest pain
·Swollen lymph nodes in the neck
·Trouble breathing or very low blood pressure (shock)

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Red flags · escalate now

·Chest pain, trouble breathing, or lips/face turning blue—the heart or lungs may be failing.
·Blood pressure dropping (shock): cold hands and feet, confusion, very fast heart rate, or not peeing—the body is not getting enough blood flow.
·Severe belly pain that will not go away—inflammation may be damaging the intestines or other organs.
·New confusion, seizure, or extreme sleepiness—the brain is not getting enough oxygen or is being affected by the inflammation.
·Swelling or bulging of a blood vessel in the heart (coronary artery aneurysm)—a dangerous complication that can lead to a heart attack even in a child.

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Workup

·Complete blood count (CBC) with differential
·C-reactive protein (CRP) and red blood cell (erythrocyte) sedimentation rate (ESR)
·Troponin I or T and brain natriuretic peptide (BNP or NT-proBNP)
·D-dimer
·Ferritin
·SARS-CoV-2 PCR (nasal swab) and SARS-CoV-2 antibody (IgG)
·Echocardiogram (echo)
·Albumin and liver enzymes (ALT, AST)

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Treatment

·Intravenous immunoglobulin (IVIG) 2 g/kg as a single dose over 8–12 hours
·Methylprednisolone 1–2 mg/kg/day IV (or equivalent corticosteroid)
·Aspirin: high-dose (30–50 mg/kg/day in 4 divided doses) during acute phase if Kawasaki-like features, then low-dose (3–5 mg/kg/day once daily) once fever resolves
·Echocardiogram at diagnosis, 1–2 weeks, and 4–6 weeks (cardiology-guided schedule)
·IV fluids (cautious boluses, 10–20 mL/kg) and inotropes (epinephrine, milrinone) if shock or low blood pressure develops
·Anakinra (IL-1 receptor antagonist, 2–10 mg/kg/day) or infliximab (TNF-alpha blocker, 5–10 mg/kg) if no improvement after 24–48 hours of IVIG and steroids
·Anticoagulation (enoxaparin, warfarin, or aspirin dose escalation) if coronary artery z-score ≥2.5 or giant aneurysm (z-score ≥10 or absolute diameter ≥8 mm)

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NCLEX trap

·MIS-C is not an active infection — it is the immune system attacking the body weeks AFTER the COVID virus is gone. The child needs IVIG (immune-calming antibodies given through an IV), steroids (to stop the immune attack), and close heart monitoring, not antibiotics.
·In MIS-C, the heart can weaken or swell very fast — even while the fever is still high. Check the heart immediately with an ultrasound and watch for shock (weak pulse, low blood pressure, cold skin). Do not wait. The heart is the most dangerous target.
·MIS-C can look like Kawasaki (red eyes, swollen lips, rash), but MIS-C happens 2 to 6 weeks AFTER COVID, usually in older kids, and the heart problems and shock happen faster and hit harder. The urgency is higher, many children need ICU care and bigger steroid doses, and the link to COVID changes the whole picture.
·MIS-C needs intensive care, IV fluids to support blood pressure, IVIG to calm the immune attack, steroids to stop inflammation, and a heart ultrasound right away to check for heart swelling and coronary artery damage. Aspirin alone will not stop the immune storm.
·In MIS-C, the fever can drop but the heart can stay swollen and weak for weeks. The child needs heart follow-up for months — sometimes 4 to 6 weeks or longer — and blood thinners like aspirin if there is a coronary aneurysm (a bulge in the heart's blood vessels that can cause clots).
·Any rash, swollen hands or feet, or red eyes in a child with fever 2 to 6 weeks after COVID is MIS-C until proven otherwise. This is a whole-body emergency that can crash the heart fast — not a local skin problem. Get the child to the hospital immediately.

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