{"uid":"cap_A0S_3zD9hGJO50RUNhgDc","slug":"tisdale-2013-qt-prolongation-risk-score-calculator-f932d654","name":"Tisdale 2013 QT Prolongation Risk Score Calculator","description":"Tisdale 2013 QT prolongation risk score (Table 5): age ≥68 (1), female (1), loop diuretic (1), potassium ≤3.5 mmol/L (2), admission QTc ≥450 ms (2), acute MI (2), sepsis (3), heart failure (3), one QTc-prolonging drug (3) plus ≥2 drugs (3 stacked; max 21). Returns bands 0-6 / 7-10 / ≥11. Deterministic published arithmetic with citation; not a medical device, not a drug-stop protocol, and not a TdP diagnosis.","url":"https://api.magentlab.com/api/calc/tisdale","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","sex","loop_diuretic","potassium_mmol_l","admission_qtc_ms","acute_mi","sepsis","heart_failure","qtc_prolonging_drugs"],"properties":{"age":{"type":"integer","description":"Age in years (18-120). Age ≥68 scores 1 (Tisdale 2013 Table 5). 67 does not score."},"sex":{"enum":["female","male"],"type":"string","description":"female scores 1; male scores 0 (Tisdale 2013 Table 5)."},"sepsis":{"type":"boolean","description":"Sepsis (Tisdale 2013 Table 5). true or false. Scores 3 if true."},"acute_mi":{"type":"boolean","description":"Acute myocardial infarction (Tisdale 2013 Table 5). true or false. Scores 2 if true."},"heart_failure":{"type":"boolean","description":"Left ventricular dysfunction / heart failure (Tisdale 2013 Table 5). true or false. Scores 3 if true."},"loop_diuretic":{"type":"boolean","description":"Loop diuretic (Tisdale 2013 Table 5). true or false. Scores 1 if true."},"admission_qtc_ms":{"type":"number","description":"Admission QTc in milliseconds (200-800). ≥450 scores 2 (Tisdale 2013 Table 5). 450 scores."},"potassium_mmol_l":{"type":"number","description":"Serum potassium in mmol/L (1.5-8.0). ≤3.5 scores 2 (Tisdale 2013 Table 5). 3.5 scores; 3.51 does not."},"qtc_prolonging_drugs":{"type":"integer","description":"Count of QTc-prolonging drugs (integer 0-20). 0 → 0 points; 1 → 3 points; ≥2 → 6 points (Table 5 one-drug and ≥2-drug rows stack)."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"path":"/api/calc/tisdale","count":2,"items":[{"sex":"male","score":0,"formula":"tisdale","citation":{"id":"tisdale-2013","doi":"10.1161/CIRCOUTCOMES.113.000152","pmid":"23716032","title":"Development and validation of a risk score to predict QT interval prolongation in hospitalized patients","source":"Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487","authors":"Tisdale JE, Jaynes HA, Kingery JR, et al."},"age_years":60,"max_score":21,"components":[{"value":60,"factor":"age_ge_68","points":0,"present":false},{"factor":"female","points":0,"present":false},{"factor":"loop_diuretic","points":0,"present":false},{"value":4,"factor":"potassium_le_3_5","points":0,"present":false},{"value":400,"factor":"admission_qtc_ge_450","points":0,"present":false},{"factor":"acute_mi","points":0,"present":false},{"factor":"sepsis","points":0,"present":false},{"factor":"heart_failure","points":0,"present":false},{"value":0,"factor":"one_qtc_prolonging_drug","points":0,"present":false},{"value":0,"factor":"two_or_more_qtc_prolonging_drugs","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.","tisdale_band":"0-6","admission_qtc_ms":400,"potassium_mmol_l":4,"formula_expression":"Tisdale = age≥68 1 + female 1 + loop_diuretic 1 + potassium≤3.5 2 + admission_QTc≥450 2 + acute_MI 2 + sepsis 3 + heart_failure 3 + one_QTc_prolonging_drug 3 + ≥2_QTc_prolonging_drugs 3; Table 5; max 21; bands 0-6 / 7-10 / ≥11","qtc_prolonging_drugs":0},{"sex":"male","score":0,"formula":"tisdale","citation":{"id":"tisdale-2013","doi":"10.1161/CIRCOUTCOMES.113.000152","pmid":"23716032","title":"Development and validation of a risk score to predict QT interval prolongation in hospitalized patients","source":"Circ Cardiovasc Qual Outcomes. 2013;6(4):479-487","authors":"Tisdale JE, Jaynes HA, Kingery JR, et al."},"age_years":60,"max_score":21,"components":[{"value":60,"factor":"age_ge_68","points":0,"present":false},{"factor":"female","points":0,"present":false},{"factor":"loop_diuretic","points":0,"present":false},{"value":4,"factor":"potassium_le_3_5","points":0,"present":false},{"value":400,"factor":"admission_qtc_ge_450","points":0,"present":false},{"factor":"acute_mi","points":0,"present":false},{"factor":"sepsis","points":0,"present":false},{"factor":"heart_failure","points":0,"present":false},{"value":0,"factor":"one_qtc_prolonging_drug","points":0,"present":false},{"value":0,"factor":"two_or_more_qtc_prolonging_drugs","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.","tisdale_band":"0-6","admission_qtc_ms":400,"potassium_mmol_l":4,"formula_expression":"Tisdale = age≥68 1 + female 1 + loop_diuretic 1 + potassium≤3.5 2 + admission_QTc≥450 2 + acute_MI 2 + sepsis 3 + heart_failure 3 + one_QTc_prolonging_drug 3 + ≥2_QTc_prolonging_drugs 3; Table 5; max 21; bands 0-6 / 7-10 / ≥11","qtc_prolonging_drugs":0}]}},"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_WCocpqisLl-HTc4t87z95","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":"Computes the Tisdale 2013 risk score for drug-induced QT prolongation and returns a risk band (low/moderate/high) based on nine clinical parameters.","exampleAgentPrompt":"Calculate the Tisdale 2013 QT prolongation risk score for a 72-year-old female patient who is on a loop diuretic, has a serum potassium of 3.2 mmol/L, an admission QTc of 460 ms, active sepsis, and is currently on 2 QTc-prolonging drugs — no acute MI or heart failure.","exampleUseCases":[{"title":"ICU sepsis patient on multiple QT drugs","prompt":"I need the Tisdale QT prolongation risk score for a 75-year-old male in the ICU with sepsis, heart failure, a QTc of 455 ms on admission, potassium of 3.4 mmol/L, on a loop diuretic, and currently receiving 3 QTc-prolonging drugs — no acute MI."},{"title":"Pre-prescribing safety check for azithromycin","prompt":"Before I add azithromycin, can you calculate the Tisdale 2013 QT risk score for this 65-year-old female patient? She has no sepsis, no MI, no heart failure, no loop diuretic, potassium is 4.0 mmol/L, admission QTc is 430 ms, and she's already on 1 QTc-prolonging drug."},{"title":"Elderly patient with hypokalemia and acute MI","prompt":"Run the Tisdale QT prolongation score for a 70-year-old male with an acute MI, potassium of 3.3 mmol/L, QTc of 470 ms at admission, on a loop diuretic, no sepsis, no heart failure, and currently on 1 QTc-prolonging medication."}],"resultDescription":"Returns the calculated Tisdale 2013 risk score (integer, maximum 21) and the corresponding risk band: low (0–6), moderate (7–10), or high (≥11), based on the sum of weighted clinical criteria from Table 5 of Tisdale 2013.","failureModes":["Missing required query parameters returns a validation error","Age outside 18–120 range is rejected","Potassium outside 1.5–8.0 mmol/L is rejected","QTc outside 200–800 ms is rejected","qtc_prolonging_drugs count outside 0–20 is rejected","Payment failure (x402) if USDC balance is insufficient"],"whenToPreferThis":"Use this endpoint when you need a deterministic, published, citable arithmetic computation of the Tisdale 2013 QT prolongation risk score for a hospitalized patient. It is ideal for clinical decision-support agents that need to risk-stratify patients before initiating QTc-prolonging drugs, and when auditability via a published scoring table is required. It does not replace clinical judgment, diagnose TdP, or recommend drug changes.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:30:02.114Z","isFirstParty":false}