PREDICT-Style Endocarditis Risk Calculator
Estimate a risk band for infective endocarditis in patients with bloodstream infection using common clinical factors. This is an educational calculator and not a substitute for physician judgment, echocardiography, or infectious disease consultation.
What is the PREDICT score in endocarditis?
The term PREDICT score is commonly used for bedside risk stratification in patients with bacteremia, especially when clinicians are deciding how aggressively to evaluate for infective endocarditis (IE). In practice, score-based tools are used to support decisions such as:
- Whether transesophageal echocardiography (TEE) is likely to be high yield.
- How urgently to involve infectious disease and cardiology teams.
- How strongly to suspect occult metastatic infection.
- How closely to monitor patients with persistent bacteremia.
No single score replaces clinical judgment. Endocarditis diagnosis still depends on blood culture data, imaging, and full assessment using frameworks such as modified Duke criteria.
How this calculator assigns points
This page uses a PREDICT-style educational model based on commonly reported high-risk features in endocarditis literature. It is designed to be transparent and practical for learning.
| Factor | Points | Why it matters |
|---|---|---|
| Age ≥65 years | +1 | Older patients often have more comorbidity and valve disease. |
| Positive cultures for 2 days | +1 | Persistent bacteremia raises concern for endovascular source. |
| Positive cultures ≥3 days | +2 | Stronger signal for persistent intravascular infection. |
| Community-acquired infection | +2 | Often associated with higher burden illness at presentation. |
| Cardiac device (CIED) | +2 | Leads and hardware can be infected and seed valves. |
| Prosthetic valve/prior valve surgery | +2 | Prosthetic material increases risk and diagnostic complexity. |
| Injection drug use | +2 | Well-known risk factor for right- and left-sided IE. |
| Fever persisting ≥72 hours | +1 | Suggests unresolved source despite treatment. |
| Embolic event | +3 | Classic complication of valvular vegetation. |
| Vertebral osteomyelitis/discitis | +2 | Can reflect hematogenous spread from endocarditis. |
| New murmur/new regurgitation | +2 | Potential sign of new valvular damage. |
| Hemodialysis dependence | +1 | Frequent vascular access and higher bacteremia risk. |
Interpreting the result
- 0 to 3 points (Low): Lower estimated probability; still evaluate if red flags are present.
- 4 to 6 points (Moderate): Consider expanded work-up; TEE often reasonable depending on context.
- 7 to 9 points (High): Strong concern for IE or endovascular source; urgent imaging usually indicated.
- 10+ points (Very High): Aggressive endocarditis-focused assessment is typically warranted.
Why endocarditis risk tools are useful
1) Faster triage
In busy inpatient settings, structured scoring highlights who might benefit from urgent TEE, repeat blood cultures, and early multidisciplinary care.
2) Better communication
A score gives teams shared language for discussing severity, consulting specialists, and documenting rationale for diagnostic decisions.
3) Safer follow-through
Patients with persistent bacteremia can look clinically improved before infection is truly controlled. Risk frameworks help avoid premature reassurance.
Limitations you should understand
- Different studies use slightly different variables and weights.
- Performance can vary by organism, setting, and local practice patterns.
- Immunocompromised states and unusual pathogens may not fit classic scoring behavior.
- Scores support decisions; they do not replace clinical diagnosis.
Frequently asked questions
Is this the official PREDICT score?
This is a transparent educational implementation inspired by published risk-factor patterns. Institutions may use formal versions with specific derivation cohorts.
Can I use this to diagnose infective endocarditis?
No. Diagnosis requires complete medical evaluation, blood cultures, echocardiography, and clinician interpretation.
What if the patient has a very high score?
A high score should prompt urgent physician review. In real practice, this often means rapid imaging, repeated cultures, and specialist involvement.