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Canadian Syncope Risk Score (CSRS) Calculator
x402
Canadian Syncope Risk Score (CSRS) Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Computes the Thiruganasambandamoorthy 2016 Canadian Syncope Risk Score from nine caller-assigned clinical flags and ECG values, returning a score from −3 to 11.
Price / call$0.005
Success—
StatusUnknown
How this service works
Thiruganasambandamoorthy 2016 Canadian Syncope Risk Score: vasovagal predisposition −1, heart disease +1, any ED SBP <90 or >180 +2, troponin above the 99th percentile +2, QRS axis < −30° or >100° +1, QRS duration >130 ms +1, QTc >480 ms +2, ED vasovagal diagnosis −2, ED cardiac diagnosis +2. Score −3 to 11. Caller assigns flags and ECG numbers. Not a medical device, not a syncope diagnosis, and not a disposition protocol.
Output
Returns an integer Canadian Syncope Risk Score between −3 and 11, computed by summing the weighted contributions of each clinical flag and ECG parameter per the Thiruganasambandamoorthy 2016 criteria. Does not provide a diagnosis, disposition, or device-class medical recommendation.
Example use cases
ED syncope risk stratification
“Score this syncope patient for me using the Canadian Syncope Risk Score: vasovagal predisposition yes, no heart disease, no abnormal BP in the ED, troponin normal, QRS axis −20 degrees, QRS duration 120 ms, QTc 470 ms, ED diagnosis is vasovagal syncope, not cardiac.”
High-risk ECG findings in syncope
“Run the Canadian Syncope Risk Score — the patient has no vasovagal predisposition, has heart disease, no abnormal ED BP, troponin is elevated, QRS axis is 105 degrees, QRS duration 140 ms, QTc 500 ms, no ED vasovagal diagnosis, and ED cardiac syncope was diagnosed.”
Borderline syncope patient scoring
“What is the CSRS score for a patient with vasovagal predisposition, no heart disease, ED systolic BP was 88 mmHg so the BP flag is true, troponin normal, QRS axis 0 degrees, QRS duration 128 ms, QTc 475 ms, and no ED vasovagal or cardiac diagnosis?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/csrsWhen to prefer
Use this endpoint when you need a structured, reproducible implementation of the Thiruganasambandamoorthy 2016 Canadian Syncope Risk Score and have already resolved the nine clinical inputs (vasovagal predisposition, heart disease, BP flags, troponin, QRS axis, QRS duration, QTc, and ED diagnosis). Prefer it over manual calculation or LLM reasoning when accuracy and auditability matter. It does not replace clinical judgment or serve as a medical device.
Side effects
- Missing required query parameters returns a validation error
- ed_vasovagal_syncope and ed_cardiac_syncope both set to true is a conflict and will produce an error
- Out-of-range numeric values (e.g. QTc outside 200–800 ms) may be rejected
- Incorrect types (string instead of boolean or number) cause schema validation failure
- Network or payment failure returns a 402 or 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/csrs",
"count": 2,
"items": [
{
"score": 0,
"qtc_ms": 400,
"formula": "csrs",
"citation": {
"id": "thiruganasambandamoorthy-2016",
"doi": "10.1503/cmaj.151469",
"pmid": "27378464",
"title": "Development of the Canadian Syncope Risk Score to predict serious adverse events after emergency department assessment of syncope.",
"source": "CMAJ. 2016;188(12):E289-E298",
"authors": "Thiruganasambandamoorthy V, Kwong K, Wells GA, et al."
},
"max_score": 11,
"components": [
{
"factor": "predisposition_vasovagal",
"points": 0,
"present": false
},
{
"factor": "heart_disease",
"points": 0,
"present": false
},
{
"factor": "sbp_lt_90_or_gt_180",
"points": 0,
"present": false
},
{
"factor": "elevated_troponin",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "qrs_axis",
"points": 0,
"present": false
},
{
"value": 80,
"factor": "qrs_duration",
"points": 0,
"present": false
},
{
"value": 400,
"factor": "qtc",
"points": 0,
"present": false
},
{
"factor": "ed_vasovagal_syncope",
"points": 0,
"present": false
},
{
"factor": "ed_cardiac_syncope",
"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.",
"qrs_axis_deg": 0,
"qrs_duration_ms": 80,
"formula_expression": "CSRS = predisposition_vasovagal(-1) + heart_disease(1) + sbp_lt_90_or_gt_180(2) + elevated_troponin(2) + (qrs_axis < -30 or > 100)(1) + (qrs_duration > 130)(1) + (qtc > 480)(2) + ed_vasovagal_syncope(-2) + ed_cardiac_syncope(2); range -3 to 11; max 11; Figure 2 / abstract (axis >100, not table 110)"
},
{
"score": 0,
"qtc_ms": 400,
"formula": "csrs",
"citation": {
"id": "thiruganasambandamoorthy-2016",
"doi": "10.1503/cmaj.151469",
"pmid": "27378464",
"title": "Development of the Canadian Syncope Risk Score to predict serious adverse events after emergency department assessment of syncope.",
"source": "CMAJ. 2016;188(12):E289-E298",
"authors": "Thiruganasambandamoorthy V, Kwong K, Wells GA, et al."
},
"max_score": 11,
"components": [
{
"factor": "predisposition_vasovagal",
"points": 0,
"present": false
},
{
"factor": "heart_disease",
"points": 0,
"present": false
},
{
"factor": "sbp_lt_90_or_gt_180",
"points": 0,
"present": false
},
{
"factor": "elevated_troponin",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "qrs_axis",
"points": 0,
"present": false
},
{
"value": 80,
"factor": "qrs_duration",
"points": 0,
"present": false
},
{
"value": 400,
"factor": "qtc",
"points": 0,
"present": false
},
{
"factor": "ed_vasovagal_syncope",
"points": 0,
"present": false
},
{
"factor": "ed_cardiac_syncope",
"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.",
"qrs_axis_deg": 0,
"qrs_duration_ms": 80,
"formula_expression": "CSRS = predisposition_vasovagal(-1) + heart_disease(1) + sbp_lt_90_or_gt_180(2) + elevated_troponin(2) + (qrs_axis < -30 or > 100)(1) + (qrs_duration > 130)(1) + (qtc > 480)(2) + ed_vasovagal_syncope(-2) + ed_cardiac_syncope(2); range -3 to 11; max 11; Figure 2 / abstract (axis >100, not table 110)"
}
]
}
}Tags
x402
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