ACS · LIVE

TIMI risk index

Compute the Morrow 2001 TIMI risk index HR × (age/10)^2 / SBP and the InTIME-II five-group cutpoints.

LIVE $0.005 USDC GET /api/calc/timi_risk_index

Markdown: /docs/timi-risk-index.md · Canonical: https://magentlab.com/docs/timi-risk-index

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

What it computes

Compute the Morrow 2001 TIMI risk index HR × (age/10)^2 / SBP and the InTIME-II five-group cutpoints.

When to use

When an agent needs the published STEMI triage index and must not invent a reperfusion or fibrinolytic decision.

When not to use

• Not a reperfusion, fibrinolytic, or triage-center order. Groups are Morrow 2001 InTIME-II cutpoints, not a diagnosis.
• Derivation excluded HR <50 or >150 and SBP <60 or >200 mm Hg. magent still returns the arithmetic outside those windows.
• This is the three-variable risk index (Lancet 2001), not the eight-item TIMI STEMI score.

Formula

timi_risk_index = heart_rate_bpm * (age_years / 10)^2 / systolic_mm_hg

Citation

Title

A simple risk index for rapid initial triage of patients with ST-elevation myocardial infarction: an InTIME II substudy

Authors

Morrow DA, Antman EM, Giugliano RP, et al.

Source

Lancet. 2001;358(9293):1571-1575

DOI

10.1016/S0140-6736(01)06649-1

Worked example

Also searched as

• TIMI risk index
• Morrow risk index
• InTIME II risk index
• TRI STEMI
• simple STEMI risk index

Try

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

/api/calc/timi_risk_index?age=65&heart_rate_bpm=80&systolic_mm_hg=120

Full URL: https://api.magentlab.com/api/calc/timi_risk_index?age=65&heart_rate_bpm=80&systolic_mm_hg=120

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/timi_risk_index?age=65&heart_rate_bpm=80&systolic_mm_hg=120"

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/timi_risk_index 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": [
    {
      "age": "65",
      "heart_rate_bpm": "80",
      "systolic_mm_hg": "120"
    },
    {
      "age": "65",
      "heart_rate_bpm": "80",
      "systolic_mm_hg": "120"
    }
  ]
}

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/timi_risk_index",
  "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": "Morrow DA, Antman EM, Giugliano RP, et al.",
        "doi": "10.1016/S0140-6736(01)06649-1",
        "id": "morrow-2001",
        "source": "Lancet. 2001;358(9293):1571-1575",
        "title": "A simple risk index for rapid initial triage of patients with ST-elevation myocardial infarction: an InTIME II substudy"
      },
      "formula": "timi_risk_index",
      "formula_expression": "timi_risk_index = heart_rate_bpm * (age_years / 10)^2 / systolic_mm_hg",
      "age_years": 65,
      "systolic_mm_hg": 120.0,
      "heart_rate_bpm": 80,
      "risk_group": 4,
      "timi_risk_index": 28.2
    },
    {
      "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": "Morrow DA, Antman EM, Giugliano RP, et al.",
        "doi": "10.1016/S0140-6736(01)06649-1",
        "id": "morrow-2001",
        "source": "Lancet. 2001;358(9293):1571-1575",
        "title": "A simple risk index for rapid initial triage of patients with ST-elevation myocardial infarction: an InTIME II substudy"
      },
      "formula": "timi_risk_index",
      "formula_expression": "timi_risk_index = heart_rate_bpm * (age_years / 10)^2 / systolic_mm_hg",
      "age_years": 65,
      "systolic_mm_hg": 120.0,
      "heart_rate_bpm": 80,
      "risk_group": 4,
      "timi_risk_index": 28.2
    }
  ]
}

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": "Morrow DA, Antman EM, Giugliano RP, et al.",
    "doi": "10.1016/S0140-6736(01)06649-1",
    "id": "morrow-2001",
    "source": "Lancet. 2001;358(9293):1571-1575",
    "title": "A simple risk index for rapid initial triage of patients with ST-elevation myocardial infarction: an InTIME II substudy"
  },
  "formula": "timi_risk_index",
  "formula_expression": "timi_risk_index = heart_rate_bpm * (age_years / 10)^2 / systolic_mm_hg",
  "age_years": 65,
  "systolic_mm_hg": 120.0,
  "heart_rate_bpm": 80,
  "risk_group": 4,
  "timi_risk_index": 28.2
}

Client errors (HTTP 400)

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

Related tools

• TIMI risk score for STEMI — Compute the TIMI risk score for ST-elevation myocardial infarction from published bedside factors at presentation.
• TIMI UA/NSTEMI — Compute the TIMI risk score for unstable angina / NSTEMI from age and six caller-assigned flags.
• HEART score — Compute the HEART score as age points plus caller-assigned history, ECG, risk factors, and troponin (each 0-2).

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.