MAGENT

Emergency · LIVE

Revised cardiac risk index (Lee)

RCRI

Sum the six Lee 1999 revised cardiac risk index factors and return class I–IV.

LIVE $0.005 USDC GET /api/calc/rcri

Markdown: /docs/rcri.md · Canonical: https://magentlab.com/docs/rcri

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

What it computes

Sum the six Lee 1999 revised cardiac risk index factors and return class I–IV.

When to use

When an agent needs the published RCRI point total and must not invent an operative-clearance decision.

When not to use

  • Not an operative clearance, cancellation, or monitoring order. Classes I–IV follow Lee 1999 (0 / 1 / 2 / ≥3 factors).
  • Does not include age. Does not convert creatinine units; creatinine_gt_2 is the published >2.0 mg/dL cutoff as a flag.

Formula

RCRI = high_risk_surgery + ischemic_heart_disease + congestive_heart_failure + cerebrovascular_disease + insulin_diabetes + creatinine_gt_2; each 1; max 6

Citation

Title
Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery
Authors
Lee TH, Marcantonio ER, Mangione CM, et al.
Source
Circulation. 1999;100(10):1043-1049
DOI
10.1161/01.CIR.100.10.1043

Worked example

No factors

Given: cerebrovascular_disease=falsecongestive_heart_failure=falsecreatinine_gt_2=falsehigh_risk_surgery=falseinsulin_diabetes=falseischemic_heart_disease=false

  1. score = 0
  2. class I

High-risk surgery, IHD, and CHF

Given: cerebrovascular_disease=falsecongestive_heart_failure=truecreatinine_gt_2=falsehigh_risk_surgery=trueinsulin_diabetes=falseischemic_heart_disease=true

  1. score = 3
  2. class IV

Also searched as

  • revised cardiac risk index
  • Lee index
  • RCRI
  • preoperative cardiac risk
  • Goldman revised

Try

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

/api/calc/rcri?high_risk_surgery=false&ischemic_heart_disease=false&congestive_heart_failure=false&cerebrovascular_disease=false&insulin_diabetes=false&creatinine_gt_2=false

Full URL: https://api.magentlab.com/api/calc/rcri?high_risk_surgery=false&ischemic_heart_disease=false&congestive_heart_failure=false&cerebrovascular_disease=false&insulin_diabetes=false&creatinine_gt_2=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/rcri?high_risk_surgery=false&ischemic_heart_disease=false&congestive_heart_failure=false&cerebrovascular_disease=false&insulin_diabetes=false&creatinine_gt_2=false"

Parameters

Name Type Required Description
high_risk_surgery boolean required Intraperitoneal, intrathoracic, or suprainguinal vascular surgery (Lee 1999). true or false.
ischemic_heart_disease boolean required History of myocardial infarction, positive exercise test, current chest pain from ischemia, nitrate use, or Q waves (Lee 1999). true or false.
congestive_heart_failure boolean required History of heart failure, pulmonary edema, PND, rales, S3, or chest radiograph with vascular redistribution (Lee 1999). true or false.
cerebrovascular_disease boolean required History of stroke or TIA (Lee 1999). true or false.
insulin_diabetes boolean required Preoperative insulin therapy for diabetes (Lee 1999). true or false.
creatinine_gt_2 boolean required Preoperative serum creatinine >2.0 mg/dL (Lee 1999). true or false.

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/rcri 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": [
    {
      "cerebrovascular_disease": "false",
      "congestive_heart_failure": "false",
      "creatinine_gt_2": "false",
      "high_risk_surgery": "false",
      "insulin_diabetes": "false",
      "ischemic_heart_disease": "false"
    },
    {
      "cerebrovascular_disease": "false",
      "congestive_heart_failure": "false",
      "creatinine_gt_2": "false",
      "high_risk_surgery": "false",
      "insulin_diabetes": "false",
      "ischemic_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/rcri",
  "items": [
    {
      "components": [
        {
          "factor": "high_risk_surgery",
          "points": 0,
          "present": false
        },
        {
          "factor": "ischemic_heart_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "cerebrovascular_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "insulin_diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "creatinine_gt_2",
          "points": 0,
          "present": 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": "Lee TH, Marcantonio ER, Mangione CM, et al.",
        "doi": "10.1161/01.CIR.100.10.1043",
        "id": "lee-1999",
        "source": "Circulation. 1999;100(10):1043-1049",
        "title": "Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery"
      },
      "formula": "rcri",
      "formula_expression": "RCRI = high_risk_surgery + ischemic_heart_disease + congestive_heart_failure + cerebrovascular_disease + insulin_diabetes + creatinine_gt_2; each 1; max 6",
      "max_score": 6,
      "score": 0,
      "rcri_class": "I"
    },
    {
      "components": [
        {
          "factor": "high_risk_surgery",
          "points": 0,
          "present": false
        },
        {
          "factor": "ischemic_heart_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "cerebrovascular_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "insulin_diabetes",
          "points": 0,
          "present": false
        },
        {
          "factor": "creatinine_gt_2",
          "points": 0,
          "present": 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": "Lee TH, Marcantonio ER, Mangione CM, et al.",
        "doi": "10.1161/01.CIR.100.10.1043",
        "id": "lee-1999",
        "source": "Circulation. 1999;100(10):1043-1049",
        "title": "Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery"
      },
      "formula": "rcri",
      "formula_expression": "RCRI = high_risk_surgery + ischemic_heart_disease + congestive_heart_failure + cerebrovascular_disease + insulin_diabetes + creatinine_gt_2; each 1; max 6",
      "max_score": 6,
      "score": 0,
      "rcri_class": "I"
    }
  ]
}

Response

Field Type Description
formula string rcri
formula_expression string Exact expression used
score integer RCRI points 0-6
max_score integer 6
rcri_class string Lee 1999 class I (0), II (1), III (2), or IV (≥3). A class, not clearance.
components array Per-factor points
citation object Lee et al. Circulation 1999 citation
disclaimer string Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "high_risk_surgery",
      "points": 0,
      "present": false
    },
    {
      "factor": "ischemic_heart_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "congestive_heart_failure",
      "points": 0,
      "present": false
    },
    {
      "factor": "cerebrovascular_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "insulin_diabetes",
      "points": 0,
      "present": false
    },
    {
      "factor": "creatinine_gt_2",
      "points": 0,
      "present": 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": "Lee TH, Marcantonio ER, Mangione CM, et al.",
    "doi": "10.1161/01.CIR.100.10.1043",
    "id": "lee-1999",
    "source": "Circulation. 1999;100(10):1043-1049",
    "title": "Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery"
  },
  "formula": "rcri",
  "formula_expression": "RCRI = high_risk_surgery + ischemic_heart_disease + congestive_heart_failure + cerebrovascular_disease + insulin_diabetes + creatinine_gt_2; each 1; max 6",
  "max_score": 6,
  "score": 0,
  "rcri_class": "I"
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_flag boolean clinical flags must be true or false Returned before settlement; you are not charged.
400 invalid_items POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400 invalid_item_count items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400 invalid_item each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

  • HEART score — Compute the HEART score as age points plus caller-assigned history, ECG, risk factors, and troponin (each 0-2).
  • Glasgow Coma Scale — Compute the Glasgow Coma Scale as the sum of caller-assigned eye, verbal, and motor integers. The 1974 or 1976 edition is required.

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.