ACS · LIVE

Duke treadmill score

Compute the Mark 1991 Duke treadmill score from Bruce-protocol exercise duration in minutes, maximal net ST-segment deviation in millimetres, and angina index (0 none, 1 nonlimiting, 2 exercise-limiting), with the paper’s illustrative three-group cutoffs.

LIVE $0.005 USDC GET /api/calc/duke_treadmill

Markdown: /docs/duke-treadmill.md · Canonical: https://magentlab.com/docs/duke-treadmill

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

What it computes

Compute the Mark 1991 Duke treadmill score from Bruce-protocol exercise duration in minutes, maximal net ST-segment deviation in millimetres, and angina index (0 none, 1 nonlimiting, 2 exercise-limiting), with the paper’s illustrative three-group cutoffs.

When to use

When an agent needs the published Mark 1991 Duke treadmill score and must not invent a catheterization order, diagnose coronary artery disease, prescribe a Bruce protocol, or read the ECG.

When not to use

• Not a medical device. magent does not diagnose coronary artery disease.
• Not a catheterization order and not a Bruce-protocol prescription.
• magent does not read the ECG. Maximal net ST-segment deviation is supplied by the caller in millimetres.
• Bands are the Mark 1991 illustrative groups only: high if score < -10, moderate if -10 ≤ score ≤ 4, low if score ≥ 5.

Formula

duke_treadmill_score = exercise_min - (5 * st_deviation_mm) - (4 * angina_index)

Citation

Title

Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease

Authors

Mark DB, Shaw L, Harrell FE Jr, Hlatky MA, Lee KL, Bengtson JR, McCants CB, Califf RM, Pryor DB

Source

N Engl J Med. 1991;325(12):849-853

DOI

10.1056/NEJM199109193251204

Worked example

Also searched as

• Duke treadmill score
• DTS
• Mark treadmill score
• Bruce protocol treadmill score
• exercise treadmill score
• Duke exercise score
• ST deviation treadmill score

Try

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

/api/calc/duke_treadmill?exercise_min=10&st_deviation_mm=1&angina_index=0

Full URL: https://api.magentlab.com/api/calc/duke_treadmill?exercise_min=10&st_deviation_mm=1&angina_index=0

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/duke_treadmill?exercise_min=10&st_deviation_mm=1&angina_index=0"

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/duke_treadmill 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": [
    {
      "angina_index": "0",
      "exercise_min": "10",
      "st_deviation_mm": "1"
    },
    {
      "angina_index": "0",
      "exercise_min": "10",
      "st_deviation_mm": "1"
    }
  ]
}

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/duke_treadmill",
  "items": [
    {
      "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": "Mark DB, Shaw L, Harrell FE Jr, Hlatky MA, Lee KL, Bengtson JR, McCants CB, Califf RM, Pryor DB",
        "doi": "10.1056/NEJM199109193251204",
        "id": "mark-1991",
        "pmid": "1875969",
        "source": "N Engl J Med. 1991;325(12):849-853",
        "title": "Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease"
      },
      "formula": "duke_treadmill",
      "formula_expression": "duke_treadmill_score = exercise_min - (5 * st_deviation_mm) - (4 * angina_index)",
      "angina_index": 0,
      "duke_band": "low",
      "duke_treadmill_score": 5.0,
      "exercise_min": 10.0,
      "st_deviation_mm": 1.0
    },
    {
      "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": "Mark DB, Shaw L, Harrell FE Jr, Hlatky MA, Lee KL, Bengtson JR, McCants CB, Califf RM, Pryor DB",
        "doi": "10.1056/NEJM199109193251204",
        "id": "mark-1991",
        "pmid": "1875969",
        "source": "N Engl J Med. 1991;325(12):849-853",
        "title": "Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease"
      },
      "formula": "duke_treadmill",
      "formula_expression": "duke_treadmill_score = exercise_min - (5 * st_deviation_mm) - (4 * angina_index)",
      "angina_index": 0,
      "duke_band": "low",
      "duke_treadmill_score": 5.0,
      "exercise_min": 10.0,
      "st_deviation_mm": 1.0
    }
  ]
}

Response

Example JSON

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

{
  "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": "Mark DB, Shaw L, Harrell FE Jr, Hlatky MA, Lee KL, Bengtson JR, McCants CB, Califf RM, Pryor DB",
    "doi": "10.1056/NEJM199109193251204",
    "id": "mark-1991",
    "pmid": "1875969",
    "source": "N Engl J Med. 1991;325(12):849-853",
    "title": "Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease"
  },
  "formula": "duke_treadmill",
  "formula_expression": "duke_treadmill_score = exercise_min - (5 * st_deviation_mm) - (4 * angina_index)",
  "angina_index": 0,
  "duke_band": "low",
  "duke_treadmill_score": 5.0,
  "exercise_min": 10.0,
  "st_deviation_mm": 1.0
}

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).
• TIMI risk score for STEMI — Compute the TIMI risk score for ST-elevation myocardial infarction from published bedside factors at presentation.
• EDACS — Compute the Than 2014 Emergency Department Assessment of Chest pain Score from age, sex, and 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.
• 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.