Misfits medical term
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MISFITS medical term mnemonic meaning
THE MISFITS is a pediatric emergency mnemonic used to recall the common causes of neonatal/infant collapse and critical illness in the Emergency Department. It's especially helpful when evaluating a sick neonate with nonspecific symptoms.
THE MISFITS — Differential Diagnosis for the Sick/Collapsed Neonate
| Letter | Cause |
|---|---|
| T | Trauma — birth trauma, non-accidental trauma (NAT), intracranial bleeding, abusive head trauma |
| H | Heart disease / Hypovolemia — congenital heart disease (ductal-dependent lesions), arrhythmias (e.g., SVT), volume depletion |
| E | Endocrine — congenital adrenal hyperplasia (CAH), hypothyroidism, hypoglycemia |
| M | Metabolic / Electrolyte disturbance — hypo/hypernatremia, hypocalcemia, hypo/hyperglycemia |
| I | Inborn errors of metabolism — organic acidemias, urea cycle defects, fatty acid oxidation disorders |
| S | Seizures / CNS abnormalities — meningitis, encephalitis, hypoxic-ischemic encephalopathy |
| F | Formula errors — over-dilution (hyponatremia), improper preparation |
| I | Intestinal disorders — intussusception, malrotation with volvulus, necrotizing enterocolitis (NEC), Hirschsprung's disease |
| T | Toxins — medication errors, accidental ingestion, drug withdrawal |
| S | Sepsis — bacterial (GBS, E. coli), viral (HSV), fungal |
Clinical Context
- Used in the Emergency Department for infants (typically <3 months) presenting with nonspecific collapse — poor feeding, lethargy, irritability, cyanosis, or apnea.
- The mnemonic prevents anchoring to sepsis alone, which is a common pitfall. Before labeling a sick neonate as septic, always ask: "Could this be cardiac?"
- Ductal-dependent cardiac lesions (e.g., hypoplastic left heart, critical aortic stenosis, coarctation of the aorta) classically present in the first 1–2 weeks of life when the ductus arteriosus closes. Treatment: prostaglandin E1 (PGE1) to reopen the duct.
- The hyperoxia test helps distinguish cardiac from pulmonary causes of cyanosis.
Bottom line: When a neonate is sick and you don't know why — run through THE MISFITS to avoid missing a life-threatening, treatable cause.
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