Hemodynamics · LIVE

ACCF/AHA heart-failure stages

ACCF/AHA HF stages

Apply the 2013 ACCF/AHA heart-failure stages (Yancy) from caller-assigned high-risk, structural heart disease, prior or current HF symptoms, and refractory specialized-care flags. Returns hf_stage A, B, C, D, or not_staged.

LIVE $0.005 USDC GET /api/calc/acc_aha_hf

Markdown: /docs/acc-aha-hf.md · Canonical: https://magentlab.com/docs/acc-aha-hf

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Apply the 2013 ACCF/AHA heart-failure stages (Yancy) from caller-assigned high-risk, structural heart disease, prior or current HF symptoms, and refractory specialized-care flags. Returns hf_stage A, B, C, D, or not_staged.

When to use

When an agent already has the four published stage assignments as booleans and needs the 2013 ACCF/AHA stage. magent does not examine the patient or read an echocardiogram. Not NYHA functional class.

When not to use

• Not a medical device and not a diagnosis of heart failure.
• magent does not examine the patient or read an echocardiogram. The four flags are caller-assigned.
• Stages are progressive and inviolate (Yancy 2013). D if refractory specialized care; else C if structural disease and prior or current symptoms; else B if structural disease without those symptoms; else A if high risk without structural disease or symptoms; else not_staged.
• Not NYHA functional class. This tool does not assign NYHA I-IV.

Formula

hf_stage D if refractory_hf_specialized; else C if structural_heart_disease and hf_symptoms_prior_or_current; else B if structural_heart_disease and not hf_symptoms_prior_or_current; else A if high_risk_for_hf and not structural_heart_disease and not hf_symptoms_prior_or_current; else not_staged (Yancy 2013 ACCF/AHA stages, progressive/inviolate). Not NYHA class

Citation

Title

2013 ACCF/AHA guideline for the management of heart failure: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines

Authors

Yancy CW, Jessup M, Bozkurt B, Butler J, Casey DE Jr, Drazner MH, Fonarow GC, Geraci SA, Horwich T, Januzzi JL, Johnson MR, Kasper EK, Levy WC, Masoudi FA, McBride PE, McMurray JJV, Mitchell JE, Peterson PN, Riegel B, Sam F, Stevenson LW, Tang WHW, Tsai EJ, Wilkoff BL

Source

Circulation. 2013;128(16):e240-e327

DOI

10.1161/CIR.0b013e31829e8776

Worked example

Also searched as

• ACCF/AHA HF stages
• ACC/AHA heart failure stages
• Yancy 2013 HF stages
• heart failure stage A B C D
• ACCF AHA stage C
• ACCF AHA stage D refractory
• 2013 heart failure guideline stages
• structural heart disease HF stage

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/acc_aha_hf?high_risk_for_hf=false&structural_heart_disease=false&hf_symptoms_prior_or_current=false&refractory_hf_specialized=false

Full URL: https://api.magentlab.com/api/calc/acc_aha_hf?high_risk_for_hf=false&structural_heart_disease=false&hf_symptoms_prior_or_current=false&refractory_hf_specialized=false

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/acc_aha_hf?high_risk_for_hf=false&structural_heart_disease=false&hf_symptoms_prior_or_current=false&refractory_hf_specialized=false"

Parameters

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/calc/acc_aha_hf Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
• The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
• HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
• Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
• x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "hf_symptoms_prior_or_current": "false",
      "high_risk_for_hf": "false",
      "refractory_hf_specialized": "false",
      "structural_heart_disease": "false"
    },
    {
      "hf_symptoms_prior_or_current": "false",
      "high_risk_for_hf": "false",
      "refractory_hf_specialized": "false",
      "structural_heart_disease": "false"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/acc_aha_hf",
  "items": [
    {
      "components": [
        {
          "factor": "high_risk_for_hf",
          "met": false
        },
        {
          "factor": "structural_heart_disease",
          "met": false
        },
        {
          "factor": "hf_symptoms_prior_or_current",
          "met": false
        },
        {
          "factor": "refractory_hf_specialized",
          "met": false
        }
      ],
      "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.",
      "citation": {
        "authors": "Yancy CW, Jessup M, Bozkurt B, Butler J, Casey DE Jr, Drazner MH, Fonarow GC, Geraci SA, Horwich T, Januzzi JL, Johnson MR, Kasper EK, Levy WC, Masoudi FA, McBride PE, McMurray JJV, Mitchell JE, Peterson PN, Riegel B, Sam F, Stevenson LW, Tang WHW, Tsai EJ, Wilkoff BL",
        "doi": "10.1161/CIR.0b013e31829e8776",
        "id": "yancy-2013",
        "pmid": "23741058",
        "source": "Circulation. 2013;128(16):e240-e327",
        "title": "2013 ACCF/AHA guideline for the management of heart failure: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines"
      },
      "formula": "acc_aha_hf",
      "formula_expression": "hf_stage D if refractory_hf_specialized; else C if structural_heart_disease and hf_symptoms_prior_or_current; else B if structural_heart_disease and not hf_symptoms_prior_or_current; else A if high_risk_for_hf and not structural_heart_disease and not hf_symptoms_prior_or_current; else not_staged (Yancy 2013 ACCF/AHA stages, progressive/inviolate). Not NYHA class",
      "hf_stage": "not_staged",
      "hf_symptoms_prior_or_current": false,
      "high_risk_for_hf": false,
      "refractory_hf_specialized": false,
      "structural_heart_disease": false
    },
    {
      "components": [
        {
          "factor": "high_risk_for_hf",
          "met": false
        },
        {
          "factor": "structural_heart_disease",
          "met": false
        },
        {
          "factor": "hf_symptoms_prior_or_current",
          "met": false
        },
        {
          "factor": "refractory_hf_specialized",
          "met": false
        }
      ],
      "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.",
      "citation": {
        "authors": "Yancy CW, Jessup M, Bozkurt B, Butler J, Casey DE Jr, Drazner MH, Fonarow GC, Geraci SA, Horwich T, Januzzi JL, Johnson MR, Kasper EK, Levy WC, Masoudi FA, McBride PE, McMurray JJV, Mitchell JE, Peterson PN, Riegel B, Sam F, Stevenson LW, Tang WHW, Tsai EJ, Wilkoff BL",
        "doi": "10.1161/CIR.0b013e31829e8776",
        "id": "yancy-2013",
        "pmid": "23741058",
        "source": "Circulation. 2013;128(16):e240-e327",
        "title": "2013 ACCF/AHA guideline for the management of heart failure: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines"
      },
      "formula": "acc_aha_hf",
      "formula_expression": "hf_stage D if refractory_hf_specialized; else C if structural_heart_disease and hf_symptoms_prior_or_current; else B if structural_heart_disease and not hf_symptoms_prior_or_current; else A if high_risk_for_hf and not structural_heart_disease and not hf_symptoms_prior_or_current; else not_staged (Yancy 2013 ACCF/AHA stages, progressive/inviolate). Not NYHA class",
      "hf_stage": "not_staged",
      "hf_symptoms_prior_or_current": false,
      "high_risk_for_hf": false,
      "refractory_hf_specialized": false,
      "structural_heart_disease": false
    }
  ]
}

Response

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "components": [
    {
      "factor": "high_risk_for_hf",
      "met": false
    },
    {
      "factor": "structural_heart_disease",
      "met": false
    },
    {
      "factor": "hf_symptoms_prior_or_current",
      "met": false
    },
    {
      "factor": "refractory_hf_specialized",
      "met": false
    }
  ],
  "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.",
  "citation": {
    "authors": "Yancy CW, Jessup M, Bozkurt B, Butler J, Casey DE Jr, Drazner MH, Fonarow GC, Geraci SA, Horwich T, Januzzi JL, Johnson MR, Kasper EK, Levy WC, Masoudi FA, McBride PE, McMurray JJV, Mitchell JE, Peterson PN, Riegel B, Sam F, Stevenson LW, Tang WHW, Tsai EJ, Wilkoff BL",
    "doi": "10.1161/CIR.0b013e31829e8776",
    "id": "yancy-2013",
    "pmid": "23741058",
    "source": "Circulation. 2013;128(16):e240-e327",
    "title": "2013 ACCF/AHA guideline for the management of heart failure: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines"
  },
  "formula": "acc_aha_hf",
  "formula_expression": "hf_stage D if refractory_hf_specialized; else C if structural_heart_disease and hf_symptoms_prior_or_current; else B if structural_heart_disease and not hf_symptoms_prior_or_current; else A if high_risk_for_hf and not structural_heart_disease and not hf_symptoms_prior_or_current; else not_staged (Yancy 2013 ACCF/AHA stages, progressive/inviolate). Not NYHA class",
  "hf_stage": "not_staged",
  "hf_symptoms_prior_or_current": false,
  "high_risk_for_hf": false,
  "refractory_hf_specialized": false,
  "structural_heart_disease": false
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

Related tools

• NYHA — Return the 1994 NYHA functional capacity class 1-4 from a caller-assigned integer, with the published class description.
• Framingham HF criteria — Apply the McKee 1971 Framingham concurrent major and minor criteria and return definite or not_definite from nine major flags, seven minor flags, and the dual weight-loss flag.

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

• HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
• exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
• HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.