Cardiovascular Risk

Cardiovascular Risk and Decision Tools

Description

This skill provides structured calculation guidance for commonly used cardiovascular risk scores and related decision tools. It supports accurate input collection, calculation, interpretation, and safety caveats.

Quick Reference

Interactive Mode (Lightweight)

1. Confirm clinical context and intended tool. 2. Collect required inputs with units and timing. 3. Validate inputs and resolve missing data. 4. Calculate and present results with interpretation. 5. Provide safety caveats and limitations.

Calculators

• ASCVD Pooled Cohort Equations
• CHA2DS2-VASc
• HAS-BLED
• Framingham Risk Score
• HEART Score
• CURB-65
• Wells Score (DVT)
• Wells Score (PE)

Safety and Limitations

• Support tool only; not diagnostic or prescriptive.
• Use local policies and clinical judgment.
• Many tools have population limits and invalid ranges.

References

See: references/cardiovascular-risk-sources.md

ASCVD Pooled Cohort Equations (PCE)

Purpose

Estimate 10-year atherosclerotic cardiovascular disease (ASCVD) risk for primary prevention.

Intended Population

Adults ages 40 to 79 without established ASCVD. Derived for non-Hispanic White and African American populations. Use caution in other populations.

Inputs

Algorithm

1. Compute natural logs for age, total cholesterol, HDL, and SBP. 2. Sum coefficients for the selected sex and race group. 3. Apply the risk equation:

Risk = 1 - S0 ^ exp(sum - mean)

Where S0 is baseline survival and mean is the mean coefficient sum for that group.

Coefficients (10-year ASCVD)

White Women

African American Women

White Men

African American Men

Output

10-year ASCVD risk percentage.

Interpretation

Use guideline thresholds for risk categories and shared decision making. Risk estimates may under- or over-estimate in certain populations.

Limitations

• Not validated for patients with established ASCVD.
• Requires accurate lipid values and blood pressure status.
• Use caution in populations not represented in derivation cohorts.

Example Calculation

White male, age 55, TC 213, HDL 50, SBP 120 untreated, nonsmoker, no diabetes:

• 10-year ASCVD risk = 5.4% (rounded)

References

See: references/cardiovascular-risk-sources.md

CHA2DS2-VASc Score

Purpose

Estimate stroke risk in patients with nonvalvular atrial fibrillation.

Intended Population

Adults with atrial fibrillation or atrial flutter. Not intended for valvular AF.

Inputs

Algorithm

Sum points across all criteria. Score range: 0 to 9.

Output

CHA2DS2-VASc total score.

Interpretation

Higher scores indicate higher annual stroke risk. Use local AF guidelines to determine anticoagulation thresholds.

Limitations

• Use clinical judgment and shared decision making.
• Not validated for rheumatic mitral stenosis or mechanical heart valves.

Example Calculation

Female, age 70, hypertension, diabetes, no prior stroke, no vascular disease:

• Age 65 to 74 = 1
• Female sex = 1
• Hypertension = 1
• Diabetes = 1
• Total score = 4

References

See: references/cardiovascular-risk-sources.md

CURB-65 Score

Purpose

Assess pneumonia severity and short-term mortality risk.

Intended Population

Adults with community-acquired pneumonia.

Inputs

Algorithm

Sum points across criteria. Score range: 0 to 5.

Output

CURB-65 total score.

Interpretation

Higher scores indicate higher mortality risk. Use local guidelines to determine disposition and treatment setting.

Limitations

• Designed for adult CAP; not validated in children.
• Does not replace clinical judgment or other severity markers.

Example Calculation

Age 72, BUN 24 mg/dL, RR 28, SBP 118, no confusion:

• Age 1 + Urea 1 = 2

References

See: references/cardiovascular-risk-sources.md

Framingham Risk Score (General CVD, 10-Year)

Purpose

Estimate 10-year risk of general cardiovascular disease (CVD).

Intended Population

Adults without known CVD. Derived from the Framingham Heart Study cohort.

Inputs

Algorithm

1. Compute natural logs for age, total cholesterol, HDL, and SBP. 2. Sum coefficients for the selected sex. 3. Apply the risk equation:

Risk = 1 - S0 ^ exp(sum - mean)

Coefficients (Primary Model)

Men

Women

Output

10-year general CVD risk percentage.

Interpretation

Use local guidelines for risk thresholds. This model is older and may differ from contemporary risk tools such as ASCVD PCE.

Limitations

• Derived from a single cohort and may misestimate risk in other populations.
• Not intended for patients with established CVD.

Example Calculation

Male, age 55, TC 213, HDL 50, SBP 120 untreated, nonsmoker, no diabetes:

• 10-year CVD risk = 10.2% (rounded)

References

See: references/cardiovascular-risk-sources.md

HAS-BLED Score

Purpose

Estimate major bleeding risk in patients with atrial fibrillation receiving anticoagulation.

Intended Population

Adults with atrial fibrillation. Use to identify modifiable bleeding risk factors.

Inputs

Algorithm

Sum points across criteria. Abnormal renal and abnormal liver count separately. Drugs and alcohol count separately. Score range: 0 to 9.

Output

HAS-BLED total score.

Interpretation

Higher scores indicate higher bleeding risk. Use to address modifiable risk factors and guide monitoring intensity, not to withhold therapy by itself.

Limitations

• Applies to AF populations studied; interpret with clinical context.
• Risk scores do not replace individualized assessment.

Example Calculation

Male, age 72, hypertension, prior stroke, on NSAIDs, no renal or liver disease:

• Hypertension = 1
• Stroke history = 1
• Elderly = 1
• Drugs (NSAIDs) = 1
• Total score = 4

References

See: references/cardiovascular-risk-sources.md

HEART Score

Purpose

Risk stratify chest pain patients for short-term major adverse cardiac events (MACE).

Intended Population

Adults presenting with chest pain or possible acute coronary syndrome.

Inputs

Each category scores 0, 1, or 2 points.

Common risk factors: hypertension, hyperlipidemia, diabetes, smoking, obesity, or family history of CAD.

Algorithm

Sum points across all categories. Score range: 0 to 10.

Output

HEART total score.

Interpretation

• 0 to 3: low risk
• 4 to 6: intermediate risk
• 7 to 10: high risk

Limitations

• Requires clinical judgment for history and ECG categories.
• Troponin interpretation depends on assay and reference ranges.

Example Calculation

Age 58, moderately suspicious history, nonspecific ECG changes, 2 risk factors, troponin normal:

• History 1 + ECG 1 + Age 1 + Risk factors 1 + Troponin 0 = 4 (intermediate risk)

References

See: references/cardiovascular-risk-sources.md

Wells Score (DVT)

Purpose

Estimate pretest probability of deep vein thrombosis (DVT).

Intended Population

Adults with suspected lower extremity DVT.

Inputs

Algorithm

Sum points across criteria. Score range: -2 to 8.

Output

Wells DVT total score.

Interpretation (Two-Level)

• <=1: DVT unlikely
• >=2: DVT likely

Limitations

• Use with D-dimer and imaging per local protocols.
• Requires clinical judgment for alternative diagnosis.

Example Calculation

Active cancer, entire leg swollen, calf swelling >=3 cm, no alternative diagnosis:

• Score = 1 + 1 + 1 = 3 (DVT likely)

References

See: references/cardiovascular-risk-sources.md

Wells Score (PE)

Purpose

Estimate pretest probability of pulmonary embolism (PE).

Intended Population

Adults with suspected pulmonary embolism.

Inputs

Algorithm

Sum points across criteria. Score range: 0 to 12.5.

Output

Wells PE total score.

Interpretation (Two-Level)

• <=4: PE unlikely
• >4: PE likely

Limitations

• Use with D-dimer and imaging per local protocols.
• Requires clinical judgment for alternative diagnosis.

Example Calculation

Heart rate 110, recent surgery, hemoptysis, no DVT signs, PE most likely:

• Score = 1.5 + 1.5 + 1 + 3 = 7 (PE likely)

References

See: references/cardiovascular-risk-sources.md

Cardiovascular Risk Sources

Licensing Note

All scoring systems and formulas here are derived from published research or official guidelines and are freely implementable with proper citation. This project uses original descriptions and does not copy proprietary content.

ASCVD Pooled Cohort Equations

• ACC/AHA Guideline on the Assessment of Cardiovascular Risk (Circulation 2014). Coefficients and baseline survival values in the pooled cohort equations table.
• Goff DC Jr, et al. Circulation 2014;129:S49-S73. (Derivation and validation).

CHA2DS2-VASc

• Lip GYH, et al. Chest 2010;137:263-272. (Score derivation)
• AAFP clinical guidance table listing CHA2DS2-VASc criteria and points.

HAS-BLED

• Pisters R, et al. Chest 2010;138:1093-1100. (Score derivation)
• AAFP clinical guidance table listing HAS-BLED criteria and point definitions.

Framingham Risk Score (General CVD)

• Framingham Heart Study: General CVD risk profile coefficients and baseline survival values.
• D'Agostino RB Sr, et al. Circulation 2008;117:743-753. (General CVD risk profile).

HEART Score

• Six AJ, et al. (HEART score derivation and validation)
• HEART score application review (open access, PMC).

CURB-65

• NICE guideline NG250: Pneumonia in adults (CURB-65 criteria and risk stratification).
• Lim WS, et al. Thorax 2003;58:377-382. (Derivation of CURB-65).

Wells DVT and PE Scores

• NICE guideline NG158: Venous thromboembolic diseases (Wells criteria for DVT and PE, two-level interpretation).
• Wells PS, et al. Lancet 1997;350:1795-1798. (DVT score)
• Wells PS, et al. Ann Intern Med 2001;135:98-107. (PE score)