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Seattle Heart Failure Model (SHFM) Survival Calculator
x402
Seattle Heart Failure Model (SHFM) Survival Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Computes 1-, 2-, and 3-year survival probabilities for heart failure patients using the Levy 2006 Seattle Heart Failure Model Table 2 multivariate hazard ratios
Price / call$0.005
Success—
StatusUnknown
How this service works
Levy 2006 Seattle Heart Failure Model 1-, 2-, and 3-year survival from Table 2 multivariate HRs. Score = sum of ln(HR)*x; S(t)=exp(-0.0405*t)**exp(score). Age, sex, NYHA, EF, ischemic etiology, SBP, furosemide-eq diuretic, labs, and already-on ACEI, beta-blocker, ARB, K-sparing diuretic, statin, BiV, ICD, or BiV-ICD. Caller assigns class, etiology, and therapy. magent does not measure labs or blood pressure. Not a diagnosis, prescription, or device order.
Output
Returns the SHFM composite score (sum of ln(HR)*x terms) and S(t)=exp(-0.0405*t)^exp(score) survival probabilities at 1, 2, and 3 years, derived from Levy 2006 Table 2 multivariate hazard ratios. The output reflects the patient's predicted probability of being alive at each time point given their clinical profile and current therapy.
Example use cases
HF clinic prognosis review
“For my 72-year-old female patient with non-ischemic heart failure, NYHA class 2, EF 35%, SBP 125 mmHg, weight 70 kg, on furosemide 40 mg/day, sodium 138, cholesterol 210, hemoglobin 13, lymphocytes 22%, uric acid 6.0, no allopurinol, on beta-blocker and ARB but no ACE inhibitor, no K-sparing diuretic, on a statin, with an ICD and no BiV pacing — what does the Seattle Heart Failure Model say her 1-, 2-, and 3-year survival chances are?”
Advanced HF device therapy decision support
“I'm evaluating a 55-year-old male NYHA class 4, ischemic, EF 15%, SBP 95, weight 95 kg, furosemide equivalent 160 mg/day, sodium 132, cholesterol 155, hemoglobin 11, lymphocytes 12%, uric acid 9.1, on allopurinol, on ACE inhibitor and carvedilol, no ARB, on spironolactone, no statin, BiV-ICD already implanted — can you compute his SHFM predicted survival at 1, 2, and 3 years?”
Comparing treatment scenarios pre/post medication change
“Before I add a statin, can you run the Seattle Heart Failure Model for my 63-year-old female patient: NYHA class 2, non-ischemic, EF 40%, SBP 130, weight 78 kg, furosemide 20 mg/day, sodium 140, cholesterol 230, hemoglobin 14, lymphocytes 25%, uric acid 5.5, no allopurinol, on ACE inhibitor, beta-blocker, no ARB, no K-sparing diuretic, no statin yet, no devices — so I can compare survival estimates with and without statin therapy?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/shfmWhen to prefer
Choose this endpoint when you need a validated, published heart failure prognostic model (Levy 2006 SHFM) that incorporates both clinical variables and medication/device therapies simultaneously. It is preferred over generic mortality calculators when the patient has heart failure and you need 1-, 2-, or 3-year survival estimates that account for NYHA class, EF, labs, and multi-drug therapy. Use it when the caller can supply all required clinical inputs including labs, medication status, and device history.
Side effects
- Missing required query parameters returns a validation error
- Age outside 14–100 range may be rejected or produce unreliable results
- Mutually exclusive device flags (e.g., icd=true and biv_icd=true simultaneously) may cause model inconsistency
- Invalid enum values for sex or nyha return a 400 error
- Payment not provided or insufficient USDC results in 402 Payment Required
- Lab values outside physiologically plausible ranges may produce extrapolated results without warning
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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