ACS · LIVE

CCS angina of effort grade (Campeau 1976)

CCS angina

Return the Campeau 1976 CCS angina of effort class 1-4 from a caller-assigned integer, with the published Table 1 class description.

LIVE $0.005 USDC GET /api/calc/ccs_angina

Markdown: /docs/ccs-angina.md · Canonical: https://magentlab.com/docs/ccs-angina

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

What it computes

Return the Campeau 1976 CCS angina of effort class 1-4 from a caller-assigned integer, with the published Table 1 class description.

When to use

When an agent already has a CCS angina of effort class 1-4 as in Campeau 1976 Table 1 and must not invent a treadmill grade, NYHA class, or silent-ischemia screen.

When not to use

Not a medical device and not an ACS diagnosis. magent does not examine the patient.
The caller assigns CCS class 1-4. magent does not walk the patient or interpret a treadmill.
Class 1-4 only from the 1976 letter. There is no class 0. This is not NYHA functional class and not a silent-ischemia screen.

Formula

CCS angina of effort class 1-4 as assigned by the caller (Campeau 1976 Table 1); not a treadmill interpretation

Citation

Title: Grading of angina pectoris
Authors: Campeau L
Source: Circulation. 1976;54(3):522-523
DOI: 10.1161/circ.54.3.947585

Worked example

Class 1 ordinary activity without angina

Given: ccs_class=1

ccs_class 1 → ordinary activity does not cause angina; score 1; max 4

Also searched as

CCS angina grade
CCS class
Campeau 1976
Canadian Cardiovascular Society angina
angina of effort class
CCS I II III IV
CCS functional class
angina pectoris grade

Try

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

/api/calc/ccs_angina?ccs_class=1

Full URL: https://api.magentlab.com/api/calc/ccs_angina?ccs_class=1

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/ccs_angina?ccs_class=1"

Parameters

Name	Type	Required	Description
`ccs_class`	integer	required	CCS angina of effort class 1-4 as assigned by the caller (Campeau 1976 Table 1: 1 ordinary activity does not cause angina; angina with strenuous or rapid or prolonged exertion at work or recreation; 2 slight limitation of ordinary activity, including walking more than 2 blocks or climbing more than one flight of ordinary stairs at a normal pace; 3 marked limitation, walking one to two blocks or climbing one flight of stairs in normal conditions; 4 inability to carry on any physical activity without discomfort, anginal syndrome may be present at rest). magent does not examine the patient.

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/ccs_angina 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": [
    {
      "ccs_class": "1"
    },
    {
      "ccs_class": "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/ccs_angina",
  "items": [
    {
      "description": "Ordinary physical activity does not cause angina, such as walking and climbing stairs. Angina with strenuous or rapid or prolonged exertion at work or recreation.",
      "components": [
        {
          "factor": "ccs_class",
          "points": 1,
          "present": 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": "Campeau L",
        "doi": "10.1161/circ.54.3.947585",
        "id": "campeau-1976",
        "pmid": "947585",
        "source": "Circulation. 1976;54(3):522-523",
        "title": "Grading of angina pectoris"
      },
      "formula": "ccs_angina",
      "formula_expression": "CCS angina of effort class 1-4 as assigned by the caller (Campeau 1976 Table 1); not a treadmill interpretation",
      "max_score": 4,
      "score": 1,
      "ccs_class": 1
    },
    {
      "description": "Ordinary physical activity does not cause angina, such as walking and climbing stairs. Angina with strenuous or rapid or prolonged exertion at work or recreation.",
      "components": [
        {
          "factor": "ccs_class",
          "points": 1,
          "present": 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": "Campeau L",
        "doi": "10.1161/circ.54.3.947585",
        "id": "campeau-1976",
        "pmid": "947585",
        "source": "Circulation. 1976;54(3):522-523",
        "title": "Grading of angina pectoris"
      },
      "formula": "ccs_angina",
      "formula_expression": "CCS angina of effort class 1-4 as assigned by the caller (Campeau 1976 Table 1); not a treadmill interpretation",
      "max_score": 4,
      "score": 1,
      "ccs_class": 1
    }
  ]
}

Response

Field	Type	Description
`formula`	string	ccs_angina
`formula_expression`	string	Published class rule
`ccs_class`	integer	Caller-assigned class 1-4
`score`	integer	Same as ccs_class
`max_score`	integer	4
`description`	string	1976 Table 1 wording for that class
`components`	array	CCS-class component
`citation`	object	Campeau 1976
`disclaimer`	string	Not a medical device

Example JSON

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

{
  "description": "Ordinary physical activity does not cause angina, such as walking and climbing stairs. Angina with strenuous or rapid or prolonged exertion at work or recreation.",
  "components": [
    {
      "factor": "ccs_class",
      "points": 1,
      "present": 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": "Campeau L",
    "doi": "10.1161/circ.54.3.947585",
    "id": "campeau-1976",
    "pmid": "947585",
    "source": "Circulation. 1976;54(3):522-523",
    "title": "Grading of angina pectoris"
  },
  "formula": "ccs_angina",
  "formula_expression": "CCS angina of effort class 1-4 as assigned by the caller (Campeau 1976 Table 1); not a treadmill interpretation",
  "max_score": 4,
  "score": 1,
  "ccs_class": 1
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_ccs_angina`	ccs_class must be an integer 1, 2, 3, or 4 (Campeau 1976). 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

NYHA — Return the 1994 NYHA functional capacity class 1-4 from a caller-assigned integer, with the published class description.
Killip — Return the Killip and Kimball 1967 myocardial-infarction heart-failure class 1-4 from a caller-assigned integer, with the published class description and 1967 CCU hospital mortality.

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.