# ATRIA stroke risk score ATRIA stroke risk score Status: LIVE Price: $0.005 USDC `GET /api/calc/atria_stroke` HTML: https://magentlab.com/docs/atria-stroke Markdown: https://magentlab.com/docs/atria-stroke.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Compute the Singer 2013 ATRIA stroke risk score from age, prior stroke, and caller-assigned female, diabetes, heart failure, hypertension, proteinuria, and eGFR <45 or ESRD flags. ## When to use When an agent needs the published Singer 2013 ATRIA AF stroke-risk arithmetic (not CHA2DS2-VASc and not Fang 2011 ATRIA hemorrhage) and must not invent the point total from prose. ## When not to use - Not a medical device. magent does not diagnose stroke or atrial fibrillation. - Not a stroke diagnosis and not an anticoagulation order or treatment recommendation. - Not CHA2DS2-VASc. This tool is the Singer 2013 ATRIA stroke risk score only. - Not the Fang 2011 ATRIA hemorrhage (bleed) score. That is a different tool. - magent does not assay eGFR or urine. Proteinuria and eGFR <45 or ESRD are caller flags. ## Formula ``` ATRIA stroke = age_prior_stroke (Singer 2013 Table 3: <65 0/8, 65-74 3/7, 75-84 5/7, >=85 6/9 without/with prior stroke) + female 1 + diabetes 1 + heart_failure 1 + hypertension 1 + proteinuria 1 + egfr_lt_45_or_esrd 1; max 15 (12 without prior stroke); 0-5 low, 6 moderate, 7-15 high ``` ## Citation [A new risk scheme to predict ischemic stroke and other thromboembolism in atrial fibrillation: the ATRIA study stroke risk score](https://doi.org/10.1161/JAHA.113.000250) Singer DE, Chang Y, Borowsky LH, Fang MC, Pomernacki NK, Udaltsova N, Reynolds K, Go AS. J Am Heart Assoc. 2013;2(3):e000250 DOI: [10.1161/JAHA.113.000250](https://doi.org/10.1161/JAHA.113.000250) ## Worked example ### Age 50, all flags false Given: `age=50, diabetes=false, egfr_lt_45_or_esrd=false, female=false, heart_failure=false, hypertension=false, prior_stroke=false, proteinuria=false` 1. Age 50 without prior stroke (Table 3 <65) → 0; remaining flags false → 0 2. Score = 0 (max 15); atria_stroke_band low ### Age 85 without other factors is moderate Given: `age=85, diabetes=false, egfr_lt_45_or_esrd=false, female=false, heart_failure=false, hypertension=false, prior_stroke=false, proteinuria=false` 1. Age ≥85 without prior stroke (Table 3) → 6 2. Score = 6 (max 15); atria_stroke_band moderate ### Age 75 plus female and hypertension is high Given: `age=75, diabetes=false, egfr_lt_45_or_esrd=false, female=true, heart_failure=false, hypertension=true, prior_stroke=false, proteinuria=false` 1. Age 75-84 without prior stroke → 5; female → 1; hypertension → 1 2. Score = 7 (max 15); atria_stroke_band high ## Also searched as - ATRIA stroke score - ATRIA stroke risk score - Singer 2013 ATRIA - ATRIA thromboembolism score - AF ATRIA stroke - ATRIA study stroke risk ## Parameters - `age` (integer, required): Age in years (18-120). Singer 2013 Table 3 without prior stroke: <65 scores 0, 65-74 scores 3, 75-84 scores 5, ≥85 scores 6. With prior stroke: <65 scores 8, 65-74 scores 7, 75-84 scores 7, ≥85 scores 9. - `prior_stroke` (boolean, required): Prior ischemic stroke as assigned by the caller. true or false. Selects the Table 3 age column. Not a stroke diagnosis. - `female` (boolean, required): Female sex as assigned by the caller. true or false. Scores 1. - `diabetes` (boolean, required): Diabetes as assigned by the caller. true or false. Scores 1. - `heart_failure` (boolean, required): Congestive heart failure as assigned by the caller (paper CHF). true or false. Scores 1. - `hypertension` (boolean, required): Diagnosed hypertension as assigned by the caller. true or false. Scores 1. - `proteinuria` (boolean, required): Proteinuria as assigned by the caller. true or false. Scores 1. magent does not assay urine. - `egfr_lt_45_or_esrd` (boolean, required): eGFR <45 or ESRD as assigned by the caller. true or false. Scores 1. magent does not assay eGFR. ## 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. Method: `POST /api/calc/atria_stroke` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: 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: ```json { "items": [ { "age": "50", "diabetes": "false", "egfr_lt_45_or_esrd": "false", "female": "false", "heart_failure": "false", "hypertension": "false", "prior_stroke": "false", "proteinuria": "false" }, { "age": "50", "diabetes": "false", "egfr_lt_45_or_esrd": "false", "female": "false", "heart_failure": "false", "hypertension": "false", "prior_stroke": "false", "proteinuria": "false" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/atria-stroke Example 200: ```json { "count": 2, "path": "/api/calc/atria_stroke", "items": [ { "components": [ { "value": 50, "factor": "age_prior_stroke", "points": 0, "present": false }, { "factor": "female", "points": 0, "present": false }, { "factor": "diabetes", "points": 0, "present": false }, { "factor": "heart_failure", "points": 0, "present": false }, { "factor": "hypertension", "points": 0, "present": false }, { "factor": "proteinuria", "points": 0, "present": false }, { "factor": "egfr_lt_45_or_esrd", "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": "Singer DE, Chang Y, Borowsky LH, Fang MC, Pomernacki NK, Udaltsova N, Reynolds K, Go AS.", "doi": "10.1161/JAHA.113.000250", "id": "singer-2013", "pmid": "23782923", "source": "J Am Heart Assoc. 2013;2(3):e000250", "title": "A new risk scheme to predict ischemic stroke and other thromboembolism in atrial fibrillation: the ATRIA study stroke risk score" }, "formula": "atria_stroke", "formula_expression": "ATRIA stroke = age_prior_stroke (Singer 2013 Table 3: <65 0/8, 65-74 3/7, 75-84 5/7, >=85 6/9 without/with prior stroke) + female 1 + diabetes 1 + heart_failure 1 + hypertension 1 + proteinuria 1 + egfr_lt_45_or_esrd 1; max 15 (12 without prior stroke); 0-5 low, 6 moderate, 7-15 high", "age_years": 50, "max_score": 15, "score": 0, "atria_stroke_band": "low" }, { "components": [ { "value": 50, "factor": "age_prior_stroke", "points": 0, "present": false }, { "factor": "female", "points": 0, "present": false }, { "factor": "diabetes", "points": 0, "present": false }, { "factor": "heart_failure", "points": 0, "present": false }, { "factor": "hypertension", "points": 0, "present": false }, { "factor": "proteinuria", "points": 0, "present": false }, { "factor": "egfr_lt_45_or_esrd", "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": "Singer DE, Chang Y, Borowsky LH, Fang MC, Pomernacki NK, Udaltsova N, Reynolds K, Go AS.", "doi": "10.1161/JAHA.113.000250", "id": "singer-2013", "pmid": "23782923", "source": "J Am Heart Assoc. 2013;2(3):e000250", "title": "A new risk scheme to predict ischemic stroke and other thromboembolism in atrial fibrillation: the ATRIA study stroke risk score" }, "formula": "atria_stroke", "formula_expression": "ATRIA stroke = age_prior_stroke (Singer 2013 Table 3: <65 0/8, 65-74 3/7, 75-84 5/7, >=85 6/9 without/with prior stroke) + female 1 + diabetes 1 + heart_failure 1 + hypertension 1 + proteinuria 1 + egfr_lt_45_or_esrd 1; max 15 (12 without prior stroke); 0-5 low, 6 moderate, 7-15 high", "age_years": 50, "max_score": 15, "score": 0, "atria_stroke_band": "low" } ] } ``` ## Response fields - `formula` (string): atria_stroke - `formula_expression` (string): Exact expression used - `score` (integer): Total points 0-15 - `max_score` (integer): Always 15 - `atria_stroke_band` (string): Singer 2013 three-category scheme: low when score is 0-5; moderate when 6; high when 7-15. Not a diagnosis. - `age_years` (integer): Age used for the Table 3 age column - `components` (array): Per-factor points - `citation` (object): Singer 2013 J Am Heart Assoc citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "value": 50, "factor": "age_prior_stroke", "points": 0, "present": false }, { "factor": "female", "points": 0, "present": false }, { "factor": "diabetes", "points": 0, "present": false }, { "factor": "heart_failure", "points": 0, "present": false }, { "factor": "hypertension", "points": 0, "present": false }, { "factor": "proteinuria", "points": 0, "present": false }, { "factor": "egfr_lt_45_or_esrd", "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": "Singer DE, Chang Y, Borowsky LH, Fang MC, Pomernacki NK, Udaltsova N, Reynolds K, Go AS.", "doi": "10.1161/JAHA.113.000250", "id": "singer-2013", "pmid": "23782923", "source": "J Am Heart Assoc. 2013;2(3):e000250", "title": "A new risk scheme to predict ischemic stroke and other thromboembolism in atrial fibrillation: the ATRIA study stroke risk score" }, "formula": "atria_stroke", "formula_expression": "ATRIA stroke = age_prior_stroke (Singer 2013 Table 3: <65 0/8, 65-74 3/7, 75-84 5/7, >=85 6/9 without/with prior stroke) + female 1 + diabetes 1 + heart_failure 1 + hypertension 1 + proteinuria 1 + egfr_lt_45_or_esrd 1; max 15 (12 without prior stroke); 0-5 low, 6 moderate, 7-15 high", "age_years": 50, "max_score": 15, "score": 0, "atria_stroke_band": "low" } ``` ## Errors - HTTP 400 `invalid_age`: age must be an integer from 18 to 120 Returned before settlement; you are not charged. - HTTP 400 `invalid_flag`: boolean clinical flags must be true or false Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [ATRIA hemorrhage score](https://magentlab.com/docs/atria) — Compute the Fang 2011 ATRIA hemorrhage score from caller-assigned anemia, severe renal disease, age, prior hemorrhage, and hypertension flags. ## 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. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/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.