{"uid":"cap_mNghEidRF1BH7KBk1zXOx","slug":"chads-65-stroke-prevention-algorithm-for-nonvalvular-af-afl-3cf8acbe","name":"CHADS-65 Stroke Prevention Algorithm for Nonvalvular AF/AFL","description":"CCS 2014 CHADS-65 algorithm for nonvalvular AF/AFL stroke-prevention discussion. Oral anticoagulant if age ≥65 or CHF, hypertension, diabetes, or prior stroke/TIA. Else aspirin if coronary, aortic, or peripheral arterial disease. Else none. Not CHADS2, not CHA2DS2-VASc, not HAS-BLED, and not an anticoagulation order. magent does not examine the patient.","url":"https://api.magentlab.com/api/calc/chads_65","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["age","chf","hypertension","diabetes","stroke_tia","vascular_disease"],"properties":{"age":{"type":"integer","description":"Age in years (18-120). ≥65 indicates oral anticoagulant (OAC). Age ≥75 is subsumed by ≥65; there is no separate age≥75 input. 64 does not indicate OAC on age alone."},"chf":{"type":"boolean","description":"Congestive heart failure as assigned by the caller. true or false. Any true CHADS2 factor other than age≥75 (CHF, hypertension, diabetes, prior stroke/TIA) indicates OAC."},"diabetes":{"type":"boolean","description":"Diabetes mellitus as assigned by the caller. true or false. Indicates OAC when true."},"stroke_tia":{"type":"boolean","description":"Prior stroke or TIA as assigned by the caller. true or false. Indicates OAC when true."},"hypertension":{"type":"boolean","description":"Hypertension history as assigned by the caller. true or false. Indicates OAC when true."},"vascular_disease":{"type":"boolean","description":"Coronary, aortic, or peripheral arterial disease as assigned by the caller. true or false. Indicates ASA only when OAC is not indicated."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Cbk1qyEmjDstYhmkSAbg-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Applies the CCS 2014 CHADS-65 algorithm to recommend oral anticoagulant, aspirin, or no therapy for stroke prevention in nonvalvular atrial fibrillation or flutter.","exampleAgentPrompt":"My patient is 68 years old with a history of hypertension and diabetes but no prior stroke, no CHF, and no vascular disease — run the CHADS-65 algorithm to see whether they need oral anticoagulation or aspirin for their nonvalvular atrial fibrillation.","exampleUseCases":[{"title":"Anticoagulation check for elderly AF patient","prompt":"My patient is 72 with nonvalvular atrial fibrillation, no CHF, no hypertension, no diabetes, no prior stroke or TIA, and no vascular disease — what does CHADS-65 say about stroke prevention therapy?"},{"title":"Aspirin vs OAC for AF patient with vascular disease","prompt":"I have a 58-year-old AF patient with known coronary artery disease but no CHF, hypertension, diabetes, or prior stroke — run CHADS-65 and tell me if aspirin or anticoagulation is recommended."},{"title":"Stroke prevention for younger diabetic AF patient","prompt":"Patient is 55 with nonvalvular atrial flutter, diabetes mellitus, no hypertension, no CHF, no prior stroke or TIA, and no vascular disease — what does the CHADS-65 algorithm recommend for stroke prevention?"}],"resultDescription":"Returns the CHADS-65 algorithm recommendation: oral anticoagulant (OAC) if age ≥65 or any of CHF, hypertension, diabetes, or prior stroke/TIA are present; aspirin if OAC is not indicated but vascular disease is present; or no antithrombotic therapy if none of the above criteria apply. This is a discussion aid, not a clinical order.","failureModes":["Missing required query parameters (age, chf, hypertension, diabetes, stroke_tia, vascular_disease) returns a validation error","Age outside integer range 18–120 may produce unexpected results or rejection","Boolean fields passed as non-boolean strings may fail schema validation","Payment failure (HTTP 402) if USDC payment is not provided or is insufficient"],"whenToPreferThis":"Choose this endpoint when you need to apply specifically the CCS 2014 CHADS-65 guideline for nonvalvular AF or AFL stroke prevention triage — not CHADS2, CHA2DS2-VASc, or HAS-BLED. Ideal for Canadian guideline-aligned clinical decision support tools or educational discussion aids.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:06:55.056Z","isFirstParty":false}