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Shock index

Compute the Allgöwer–Burri shock index as heart rate in bpm divided by cuff systolic pressure in mm Hg.

Also searched as

• shock index
• Allgöwer shock index
• Burri shock index
• HR over SBP
• heart rate systolic ratio
• Allgower Burri index
• SI heart rate SBP

LIVE $0.005 USDC GET /api/calc/shock_index

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

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

What it computes

Compute the Allgöwer–Burri shock index as heart rate in bpm divided by cuff systolic pressure in mm Hg.

When to use

When an agent needs the published heart-rate / systolic-pressure ratio and must not invent a shock cutoff or a MAP-based index.

When not to use

• Not a diagnosis and not a treatment target. The original index is the ratio of heart rate to systolic pressure; magent does not diagnose shock.
• Does not apply a shock or no-shock cutoff.
• Does not use MAP or diastolic pressure in this tool.

Formula

shock_index = heart_rate_bpm / systolic_mm_hg

Citation

Title

Shock index

Authors

Allgöwer M, Burri C

Source

Dtsch Med Wochenschr. 1967;92(43):1947-1950

DOI

10.1055/s-0028-1106070

Worked example

Try

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

/api/calc/shock_index?heart_rate_bpm=80&systolic_mm_hg=120

Full URL: https://api.magentlab.com/api/calc/shock_index?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/shock_index?heart_rate_bpm=80&systolic_mm_hg=120"

Parameters

Bulk (POST)

POST the same path with a JSON items array. Price is n times the GET unit. Invalid items return HTTP 400 before settlement.

POST /api/calc/shock_index Max 25 unit_amount * n PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• 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_rate_bpm": "80",
      "systolic_mm_hg": "120"
    },
    {
      "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/shock_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": "Allgöwer M, Burri C",
        "doi": "10.1055/s-0028-1106070",
        "id": "allgower-burri-1967",
        "source": "Dtsch Med Wochenschr. 1967;92(43):1947-1950",
        "title": "Shock index"
      },
      "formula": "shock_index",
      "formula_expression": "shock_index = heart_rate_bpm / systolic_mm_hg",
      "systolic_mm_hg": 120.0,
      "heart_rate_bpm": 80,
      "shock_index": 0.67
    },
    {
      "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": "Allgöwer M, Burri C",
        "doi": "10.1055/s-0028-1106070",
        "id": "allgower-burri-1967",
        "source": "Dtsch Med Wochenschr. 1967;92(43):1947-1950",
        "title": "Shock index"
      },
      "formula": "shock_index",
      "formula_expression": "shock_index = heart_rate_bpm / systolic_mm_hg",
      "systolic_mm_hg": 120.0,
      "heart_rate_bpm": 80,
      "shock_index": 0.67
    }
  ]
}

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": "Allgöwer M, Burri C",
    "doi": "10.1055/s-0028-1106070",
    "id": "allgower-burri-1967",
    "source": "Dtsch Med Wochenschr. 1967;92(43):1947-1950",
    "title": "Shock index"
  },
  "formula": "shock_index",
  "formula_expression": "shock_index = heart_rate_bpm / systolic_mm_hg",
  "systolic_mm_hg": 120.0,
  "heart_rate_bpm": 80,
  "shock_index": 0.67
}

Client errors (HTTP 400)

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

Related tools

• MAP — Compute conventional estimated mean arterial pressure from cuff systolic and diastolic pressures.

Payment

Required query parameters must be present and valid. 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

• Invalid query parameters return HTTP 400 before settlement. You are not charged.
• Settlement finishes before the tool executes (paymentFlow upfront). 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.