Six Weeks of Fever in a 'Low-Risk' 32-Year-Old — Culture-Negative Infective Endocarditis Presenting as Renal Infarction, Fatal

Key finding

> **Three separate reassuring results, none of them wrong, and together they were lethal.** > > *"Previously healthy, low-risk."* Endocarditis risk stratification is built around prosthetic valves, known structural heart disease, injection drug use, and indwelling lines. A 32-year-old woman with none of these is low-risk — and low-risk is a statement about prior probability, not about what is happening in her chest right now. > > *Repeatedly negative blood cultures.* Culture-negative endocarditis accounts for a substantial minority of cases and is more common where antibiotics are available without prescription, because prior antibiotic exposure sterilises cultures. A negative culture in that setting has drastically reduced negative predictive value — but it reads on the chart exactly the same as a negative culture in a treatment-naive patient. > > *No visible vegetation on echocardiogra

Framework connections: The Missing Mechanics (EPCs), The Signal Fire (IL-6), The Undersized Filter (Renal-Metabolic), The Burn and Crash Model

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