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Fincke 2004 Cardiac Power Output (CPO) Calculator
x402
Fincke 2004 Cardiac Power Output (CPO) 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).
Calculates cardiac power output in watts using the Fincke 2004 formula (CPO = MAP × CO / 451) and returns the result with ROC-based risk band classification.
Price / call$0.005
Success—
StatusUnknown
How this service works
Fincke 2004 cardiac power output from MAP (mm Hg) and cardiac output (L/min): CPO = MAP × CO / 451. Returns cpo_watts to two decimals and the paper ROC band (<=0.53 or >0.53) from the unrounded value. Equality at 0.53 W is <=0.53. MAP is caller-supplied (Fincke used diastolic + (systolic−diastolic)/3); this tool does not take SBP/DBP or compute cardiac power index. Not a medical device, shock diagnosis, or treatment target.
Output
Returns cpo_watts (a number rounded to two decimal places representing cardiac power output in watts) and the Fincke 2004 ROC band classification — either '<=0.53' or '>0.53' — derived from the unrounded CPO value. Values exactly equal to 0.53 W are classified as <=0.53.
Example use cases
ICU hemodynamic risk stratification
“My ICU patient has a MAP of 65 mm Hg and a cardiac output of 3.1 L/min — can you compute their cardiac power output using the Fincke 2004 formula and tell me if they're above or below the 0.53-watt threshold?”
Cardiology consult documentation
“For a consult note, I need the Fincke 2004 CPO value for a patient with MAP of 88 mm Hg and cardiac output of 5.8 L/min — give me the watts to two decimal places and the ROC band.”
Automated hemodynamic monitoring pipeline
“Every hour I'm pulling MAP and cardiac output from the EMR — can you run the Fincke CPO calculation for MAP 72 mm Hg and CO 3.9 L/min and flag if CPO is in the low-risk or high-risk band?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/cpoWhen to prefer
Choose this endpoint when you need to apply the exact Fincke 2004 CPO formula (MAP × CO / 451) and receive the published ROC-based risk band classification. Prefer this over manual calculation when precision to two decimal places and correct boundary handling (<=0.53 equality case) are required. Use it when MAP has already been computed externally (e.g. from /api/calc/map) since this endpoint does not accept SBP/DBP inputs. Not suitable for computing cardiac power index (body surface area-indexed values) or for diagnostic or treatment decisions.
Side effects
- map_mm_hg outside 30–180 range returns a validation error
- cardiac_output_l_min outside 0.5–20 range returns a validation error
- missing required query parameters returns a 400-level error
- payment not included or insufficient USDC results in x402 payment required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/cpo",
"count": 2,
"items": [
{
"band": ">0.53",
"formula": "cpo",
"citation": {
"id": "fincke-2004",
"doi": "10.1016/j.jacc.2004.03.060",
"pmid": "15261929",
"title": "Cardiac power is the strongest hemodynamic correlate of mortality in cardiogenic shock: a report from the SHOCK trial registry",
"source": "J Am Coll Cardiol. 2004;44(2):340-348",
"authors": "Fincke R, Hochman JS, Lowe AM, et al."
},
"cpo_watts": 1,
"map_mm_hg": 90,
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "cpo_watts = map_mm_hg * cardiac_output_l_min / 451",
"cardiac_output_l_min": 5
},
{
"band": ">0.53",
"formula": "cpo",
"citation": {
"id": "fincke-2004",
"doi": "10.1016/j.jacc.2004.03.060",
"pmid": "15261929",
"title": "Cardiac power is the strongest hemodynamic correlate of mortality in cardiogenic shock: a report from the SHOCK trial registry",
"source": "J Am Coll Cardiol. 2004;44(2):340-348",
"authors": "Fincke R, Hochman JS, Lowe AM, et al."
},
"cpo_watts": 1,
"map_mm_hg": 90,
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "cpo_watts = map_mm_hg * cardiac_output_l_min / 451",
"cardiac_output_l_min": 5
}
]
}
}Tags
x402
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