EGSYS score

EGSYS

Sum the six Del Rosso 2008 EGSYS flags and return whether the total is ≥3 (published cardiac-syncope triage discriminator).

LIVE $0.005 USDC GET /api/calc/egsys

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

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

What it computes

Sum the six Del Rosso 2008 EGSYS flags and return whether the total is ≥3 (published cardiac-syncope triage discriminator).

When to use

When an agent needs the published EGSYS point total from caller-assigned flags and must not invent a syncope history or a cardiac-syncope diagnosis.

When not to use

Not a medical device. Not a cardiac-syncope diagnosis, disposition, or admission order.
Only the Del Rosso 2008 discriminator (score ≥3 versus <3) is returned. magent does not invent other cutoffs.
The caller assigns the six flags. magent does not take a history, read an ECG, or diagnose heart disease.

Formula

EGSYS = 4*palpitations + 3*abnormal_ecg_or_heart_disease + 3*syncope_during_effort + 2*syncope_supine - 1*no_autonomic_prodromes - 1*no_precipitating_factors; range -2 to 12; score_ge_3 iff total >= 3 (Del Rosso 2008)

Citation

Title: Clinical predictors of cardiac syncope at initial evaluation in patients referred urgently to a general hospital: the EGSYS score
Authors: Del Rosso A, Ungar A, Maggi R, Giada F, Petix NR, De Santo T, Menozzi C, Brignole M
Source: Heart. 2008;94(12):1620-1626
DOI: 10.1136/hrt.2008.143123

Worked example

All six flags false

Given: abnormal_ecg_or_heart_disease=falseno_autonomic_prodromes=falseno_precipitating_factors=falsepalpitations=falsesyncope_during_effort=falsesyncope_supine=false

Each flag false → 0
Score = 0 (max 12); score_ge_3 false (below the ≥3 discriminator)

Palpitations plus absence of autonomic prodromes (score 3)

Given: abnormal_ecg_or_heart_disease=falseno_autonomic_prodromes=trueno_precipitating_factors=falsepalpitations=truesyncope_during_effort=falsesyncope_supine=false

palpitations → +4; no_autonomic_prodromes → −1; remaining flags 0
Score = 3 (max 12); score_ge_3 true (Del Rosso 2008 ≥3 discriminator)

Also searched as

EGSYS score
Evaluation of Guidelines in Syncope Study
Del Rosso syncope score
EGSYS cardiac syncope
syncope EGSYS 2008
hospital syncope score EGSYS

Try

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

/api/calc/egsys?palpitations=false&abnormal_ecg_or_heart_disease=false&syncope_during_effort=false&syncope_supine=false&no_autonomic_prodromes=false&no_precipitating_factors=false

Full URL: https://api.magentlab.com/api/calc/egsys?palpitations=false&abnormal_ecg_or_heart_disease=false&syncope_during_effort=false&syncope_supine=false&no_autonomic_prodromes=false&no_precipitating_factors=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/egsys?palpitations=false&abnormal_ecg_or_heart_disease=false&syncope_during_effort=false&syncope_supine=false&no_autonomic_prodromes=false&no_precipitating_factors=false"

Parameters

Name	Type	Required	Description
`palpitations`	boolean	required	Palpitations preceding syncope (Del Rosso 2008, +4). true or false as assigned by the caller. magent does not take a history.
`abnormal_ecg_or_heart_disease`	boolean	required	Abnormal ECG and/or heart disease (Del Rosso 2008, +3). true or false as assigned by the caller. magent does not read an ECG.
`syncope_during_effort`	boolean	required	Syncope during effort (Del Rosso 2008, +3). true or false as assigned by the caller.
`syncope_supine`	boolean	required	Syncope while supine (Del Rosso 2008, +2). true or false as assigned by the caller.
`no_autonomic_prodromes`	boolean	required	Absence of autonomic prodromes (Del Rosso 2008, −1). true or false as assigned by the caller.
`no_precipitating_factors`	boolean	required	Absence of predisposing and/or precipitating factors (Del Rosso 2008, −1). true or false as assigned by the caller.

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/egsys 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": [
    {
      "abnormal_ecg_or_heart_disease": "false",
      "no_autonomic_prodromes": "false",
      "no_precipitating_factors": "false",
      "palpitations": "false",
      "syncope_during_effort": "false",
      "syncope_supine": "false"
    },
    {
      "abnormal_ecg_or_heart_disease": "false",
      "no_autonomic_prodromes": "false",
      "no_precipitating_factors": "false",
      "palpitations": "false",
      "syncope_during_effort": "false",
      "syncope_supine": "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/egsys",
  "items": [
    {
      "components": [
        {
          "factor": "palpitations",
          "points": 0,
          "present": false
        },
        {
          "factor": "abnormal_ecg_or_heart_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "syncope_during_effort",
          "points": 0,
          "present": false
        },
        {
          "factor": "syncope_supine",
          "points": 0,
          "present": false
        },
        {
          "factor": "no_autonomic_prodromes",
          "points": 0,
          "present": false
        },
        {
          "factor": "no_precipitating_factors",
          "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": "Del Rosso A, Ungar A, Maggi R, Giada F, Petix NR, De Santo T, Menozzi C, Brignole M",
        "doi": "10.1136/hrt.2008.143123",
        "id": "del-rosso-2008",
        "pmid": "18519550",
        "source": "Heart. 2008;94(12):1620-1626",
        "title": "Clinical predictors of cardiac syncope at initial evaluation in patients referred urgently to a general hospital: the EGSYS score"
      },
      "formula": "egsys",
      "formula_expression": "EGSYS = 4*palpitations + 3*abnormal_ecg_or_heart_disease + 3*syncope_during_effort + 2*syncope_supine - 1*no_autonomic_prodromes - 1*no_precipitating_factors; range -2 to 12; score_ge_3 iff total >= 3 (Del Rosso 2008)",
      "max_score": 12,
      "score": 0,
      "score_ge_3": false
    },
    {
      "components": [
        {
          "factor": "palpitations",
          "points": 0,
          "present": false
        },
        {
          "factor": "abnormal_ecg_or_heart_disease",
          "points": 0,
          "present": false
        },
        {
          "factor": "syncope_during_effort",
          "points": 0,
          "present": false
        },
        {
          "factor": "syncope_supine",
          "points": 0,
          "present": false
        },
        {
          "factor": "no_autonomic_prodromes",
          "points": 0,
          "present": false
        },
        {
          "factor": "no_precipitating_factors",
          "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": "Del Rosso A, Ungar A, Maggi R, Giada F, Petix NR, De Santo T, Menozzi C, Brignole M",
        "doi": "10.1136/hrt.2008.143123",
        "id": "del-rosso-2008",
        "pmid": "18519550",
        "source": "Heart. 2008;94(12):1620-1626",
        "title": "Clinical predictors of cardiac syncope at initial evaluation in patients referred urgently to a general hospital: the EGSYS score"
      },
      "formula": "egsys",
      "formula_expression": "EGSYS = 4*palpitations + 3*abnormal_ecg_or_heart_disease + 3*syncope_during_effort + 2*syncope_supine - 1*no_autonomic_prodromes - 1*no_precipitating_factors; range -2 to 12; score_ge_3 iff total >= 3 (Del Rosso 2008)",
      "max_score": 12,
      "score": 0,
      "score_ge_3": false
    }
  ]
}

Response

Field	Type	Description
`formula`	string	egsys
`formula_expression`	string	Exact expression used
`score`	integer	EGSYS points -2 to 12
`max_score`	integer	12
`score_ge_3`	boolean	true iff score ≥ 3 (Del Rosso 2008 cardiac-syncope triage discriminator). Not a diagnosis.
`components`	array	Per-flag points
`citation`	object	Del Rosso et al. Heart 2008 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "palpitations",
      "points": 0,
      "present": false
    },
    {
      "factor": "abnormal_ecg_or_heart_disease",
      "points": 0,
      "present": false
    },
    {
      "factor": "syncope_during_effort",
      "points": 0,
      "present": false
    },
    {
      "factor": "syncope_supine",
      "points": 0,
      "present": false
    },
    {
      "factor": "no_autonomic_prodromes",
      "points": 0,
      "present": false
    },
    {
      "factor": "no_precipitating_factors",
      "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": "Del Rosso A, Ungar A, Maggi R, Giada F, Petix NR, De Santo T, Menozzi C, Brignole M",
    "doi": "10.1136/hrt.2008.143123",
    "id": "del-rosso-2008",
    "pmid": "18519550",
    "source": "Heart. 2008;94(12):1620-1626",
    "title": "Clinical predictors of cardiac syncope at initial evaluation in patients referred urgently to a general hospital: the EGSYS score"
  },
  "formula": "egsys",
  "formula_expression": "EGSYS = 4*palpitations + 3*abnormal_ecg_or_heart_disease + 3*syncope_during_effort + 2*syncope_supine - 1*no_autonomic_prodromes - 1*no_precipitating_factors; range -2 to 12; score_ge_3 iff total >= 3 (Del Rosso 2008)",
  "max_score": 12,
  "score": 0,
  "score_ge_3": false
}

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

San Francisco Syncope Rule — Compute the San Francisco Syncope Rule (CHESS) criterion count and rule-positive flag from published cutoffs.

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.