ACS · LIVE

HEART Pathway

Apply the Mahler 2015 HEART Pathway and return whether a caller-assigned HEART score plus 0-hour and 3-hour troponin flags meet the published early-discharge rule.

LIVE $0.005 USDC GET /api/calc/heart_pathway

Markdown: /docs/heart-pathway.md · Canonical: https://magentlab.com/docs/heart-pathway

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

What it computes

Apply the Mahler 2015 HEART Pathway and return whether a caller-assigned HEART score plus 0-hour and 3-hour troponin flags meet the published early-discharge rule.

When to use

When an agent already has a caller-assigned Six 2008 HEART total (0-10) and caller-assigned 0-hour and 3-hour troponin elevation flags and needs the published Mahler 2015 early-discharge candidate result. magent does not assign HEART items, read an ECG, or assay a troponin.

When not to use

• Not a medical device and not a diagnosis of ACS or of discharge safety.
• heart_score is the caller-assigned Six 2008 HEART total (0-10). magent does not assign history, ECG, age, risk-factor, or troponin HEART items.
• troponin_0_elevated and troponin_3h_elevated are caller-assigned flags for a value above the 99th percentile. magent does not assay a troponin or read an ECG.
• This tool does not order a stress test or angiogram. Presence of high-risk features does not mandate a test.
• This is the Mahler 2015 HEART Pathway (HEART 0-3 plus serial 0h/3h troponin), not the Six 2008 HEART score alone.

Formula

early_discharge_candidate iff heart_score <= 3 and troponin_0_elevated is false and troponin_3h_elevated is false; heart_score is the caller-assigned Six 2008 HEART total 0-10; troponin flags are caller-assigned above the 99th percentile at 0 and 3 hours (Mahler 2015)

Citation

Title

The HEART Pathway randomized trial: identifying emergency department patients with acute chest pain for early discharge

Authors

Mahler SA, Riley RF, Hiestand BC, Russell GB, Hoekstra JW, Lefebvre CW, Nicks BA, Cline DM, Askew KL, Elliott SB, Herrington DM, Burke GL, Miller CD

Source

Circ Cardiovasc Qual Outcomes. 2015;8(2):195-203

DOI

10.1161/CIRCOUTCOMES.114.001384

Worked example

Also searched as

• HEART Pathway
• Mahler HEART Pathway
• HEART Pathway early discharge
• HEART 0-3 serial troponin
• Mahler 2015 chest pain
• low-risk HEART Pathway
• HEART Pathway randomized trial

Try

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

/api/calc/heart_pathway?heart_score=2&troponin_0_elevated=false&troponin_3h_elevated=false

Full URL: https://api.magentlab.com/api/calc/heart_pathway?heart_score=2&troponin_0_elevated=false&troponin_3h_elevated=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/heart_pathway?heart_score=2&troponin_0_elevated=false&troponin_3h_elevated=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/heart_pathway 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": [
    {
      "heart_score": "2",
      "troponin_0_elevated": "false",
      "troponin_3h_elevated": "false"
    },
    {
      "heart_score": "2",
      "troponin_0_elevated": "false",
      "troponin_3h_elevated": "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/heart_pathway",
  "items": [
    {
      "components": [
        {
          "value": 2,
          "factor": "heart_score_le_3",
          "met": true
        },
        {
          "value": false,
          "factor": "trop0_not_elevated",
          "met": true
        },
        {
          "value": false,
          "factor": "trop3h_not_elevated",
          "met": true
        }
      ],
      "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": "Mahler SA, Riley RF, Hiestand BC, Russell GB, Hoekstra JW, Lefebvre CW, Nicks BA, Cline DM, Askew KL, Elliott SB, Herrington DM, Burke GL, Miller CD",
        "doi": "10.1161/CIRCOUTCOMES.114.001384",
        "id": "mahler-2015",
        "pmid": "25737484",
        "source": "Circ Cardiovasc Qual Outcomes. 2015;8(2):195-203",
        "title": "The HEART Pathway randomized trial: identifying emergency department patients with acute chest pain for early discharge"
      },
      "formula": "heart_pathway",
      "formula_expression": "early_discharge_candidate iff heart_score <= 3 and troponin_0_elevated is false and troponin_3h_elevated is false; heart_score is the caller-assigned Six 2008 HEART total 0-10; troponin flags are caller-assigned above the 99th percentile at 0 and 3 hours (Mahler 2015)",
      "early_discharge_candidate": true,
      "heart_score": 2,
      "troponin_0_elevated": false,
      "troponin_3h_elevated": false
    },
    {
      "components": [
        {
          "value": 2,
          "factor": "heart_score_le_3",
          "met": true
        },
        {
          "value": false,
          "factor": "trop0_not_elevated",
          "met": true
        },
        {
          "value": false,
          "factor": "trop3h_not_elevated",
          "met": true
        }
      ],
      "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": "Mahler SA, Riley RF, Hiestand BC, Russell GB, Hoekstra JW, Lefebvre CW, Nicks BA, Cline DM, Askew KL, Elliott SB, Herrington DM, Burke GL, Miller CD",
        "doi": "10.1161/CIRCOUTCOMES.114.001384",
        "id": "mahler-2015",
        "pmid": "25737484",
        "source": "Circ Cardiovasc Qual Outcomes. 2015;8(2):195-203",
        "title": "The HEART Pathway randomized trial: identifying emergency department patients with acute chest pain for early discharge"
      },
      "formula": "heart_pathway",
      "formula_expression": "early_discharge_candidate iff heart_score <= 3 and troponin_0_elevated is false and troponin_3h_elevated is false; heart_score is the caller-assigned Six 2008 HEART total 0-10; troponin flags are caller-assigned above the 99th percentile at 0 and 3 hours (Mahler 2015)",
      "early_discharge_candidate": true,
      "heart_score": 2,
      "troponin_0_elevated": false,
      "troponin_3h_elevated": false
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 2,
      "factor": "heart_score_le_3",
      "met": true
    },
    {
      "value": false,
      "factor": "trop0_not_elevated",
      "met": true
    },
    {
      "value": false,
      "factor": "trop3h_not_elevated",
      "met": true
    }
  ],
  "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": "Mahler SA, Riley RF, Hiestand BC, Russell GB, Hoekstra JW, Lefebvre CW, Nicks BA, Cline DM, Askew KL, Elliott SB, Herrington DM, Burke GL, Miller CD",
    "doi": "10.1161/CIRCOUTCOMES.114.001384",
    "id": "mahler-2015",
    "pmid": "25737484",
    "source": "Circ Cardiovasc Qual Outcomes. 2015;8(2):195-203",
    "title": "The HEART Pathway randomized trial: identifying emergency department patients with acute chest pain for early discharge"
  },
  "formula": "heart_pathway",
  "formula_expression": "early_discharge_candidate iff heart_score <= 3 and troponin_0_elevated is false and troponin_3h_elevated is false; heart_score is the caller-assigned Six 2008 HEART total 0-10; troponin flags are caller-assigned above the 99th percentile at 0 and 3 hours (Mahler 2015)",
  "early_discharge_candidate": true,
  "heart_score": 2,
  "troponin_0_elevated": false,
  "troponin_3h_elevated": false
}

Client errors (HTTP 400)

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

Related tools

• HEART score — Compute the HEART score as age points plus caller-assigned history, ECG, risk factors, and troponin (each 0-2).
• EDACS — Compute the Than 2014 Emergency Department Assessment of Chest pain Score from age, sex, and caller-assigned flags.
• TIMI UA/NSTEMI — Compute the TIMI risk score for unstable angina / NSTEMI from age and six caller-assigned flags.

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.