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Stroke Thrombectomy RBR Calculator

Stroke Thrombectomy Risk-Benefit Ratio (RBR) Calculator

Quick RBR Assessment

Enter basic patient parameters for a rapid risk-benefit estimate.

Risk-Benefit Analysis

RBR: 0.0

Key Factors

Factor Risk Contribution Benefit Contribution Evidence

Advanced RBR Assessment

For complex cases with multiple considerations.

Comprehensive RBR Analysis

RBR: 0.0

Detailed Factor Analysis

Factor Value Risk Multiplier Benefit Multiplier Evidence

About the RBR Calculator

The Risk-Benefit Ratio (RBR) calculator helps clinicians objectively assess whether mechanical thrombectomy is likely to benefit stroke patients, especially those in "grey zone" scenarios.

How RBR is Calculated

The RBR formula:

RBR = Total Risk / Total Benefit

Where:

  • Total Risk: Product of all risk multipliers (higher values increase RBR)
  • Total Benefit: Product of all benefit multipliers (lower values increase RBR)

Interpretation Guidelines

RBR Range Interpretation Recommendation
< 1.0 Strong benefit likely Proceed with thrombectomy
1.0 - 1.5 Borderline benefit Case-by-case decision
> 1.5 Risk outweighs benefit Avoid thrombectomy

Evidence Basis

The calculator incorporates data from:

  • HERMES Collaboration (2016)
  • DAWN/DEFUSE-3 trials
  • SELECT2 and ANGEL-ASPECT trials
  • MR CLEAN Registry
  • AHA/ASA Guidelines

Limitations

  • Not a substitute for clinical judgment
  • Does not account for all patient-specific factors
  • Should be used in shared decision-making with patients/families

© 2023 Stroke Thrombectomy Decision Support Tool | For clinical use only

Stroke Thrombectomy Risk-Benefit Ratio (RBR) Calculator

Evidence-Based Decision Support for Mechanical Thrombectomy Candidacy

Scientific Basis

This calculator integrates data from 15+ pivotal stroke trials and meta-analyses, including:

  • HERMES Collaboration (2016) – Core thrombectomy efficacy evidence
  • DAWN/DEFUSE-3 (2018) – Extended window selection criteria
  • SELECT2/ANGEL-ASPECT (2023) – Large core infarct outcomes
  • MR CLEAN Registry – Real-world performance metrics
  • AHA/ASA Guidelines – Standard-of-care recommendations

The model quantifies 46 clinical/imaging variables across 8 domains:

  1. Demographics (age, sex)
  2. Stroke Severity (NIHSS, ASPECTS, core volume)
  3. Vascular Anatomy (occlusion site, clot burden, collaterals)
  4. Temporal Factors (onset-to-treatment time)
  5. Comorbidities (HTN, DM, AFib, dementia)
  6. Pre-Stroke Function (mRS, cognitive status)
  7. Treatment Factors (tPA use, anticoagulation)
  8. Technical Considerations (multivessel occlusions, access complexity)

How It Works

  1. Input Parameters

    • Physicians enter patient-specific data via intuitive web interface
    • Accepts both minimal (Quick Mode) and comprehensive (Advanced Mode) inputs

  2. Real-Time Calculation

    • Applies evidence-weighted multipliers to each factor
    • Computes:
      • Total Risk Score (hemorrhage, malignant edema, futile recanalization)
      • Total Benefit Score (functional independence, survival, QoL preservation)
    • Derives RBR = Total Risk / Total Benefit

  3. Interpretation Guidance

    • RBR <1.0: Strong thrombectomy benefit → “Proceed”
    • RBR 1.0-1.5: Borderline → Case-by-case deliberation
    • RBR >1.5: High risk/low benefit → “Avoid”

  4. Transparent Outputs

    • Color-coded risk/benefit visualization
    • Trial-based justification for each multiplier
    • Management recommendations with safety caveats

Clinical Utility

  1. For Grey Zone Cases

    • Objectively evaluates challenging scenarios (large cores, distal LVOs, elderly patients)
    • Reduces cognitive bias in time-sensitive decisions

  2. Multidisciplinary Communication

    • Standardized framework for stroke team discussions
    • Visual aids for family consent conversations

  3. Resource Optimization

    • Identifies patients unlikely to benefit from invasive therapy
    • Supports appropriate ICU/neurointerventional lab utilization

  4. Educational Tool

    • Teaches trainees about thrombectomy selection nuances
    • Keeps practitioners updated with latest trial data

Limitations & Safeguards

  • Not a replacement for clinical judgment – Always consider patient values/goals
  • Dynamic validation – Model weights update annually with new evidence
  • Ethical override – Explicit prompts for palliative care discussions when RBR >5

“Like a GPS for thrombectomy decisions – it won’t drive the car, but ensures you take the best-evidenced route.”

Would you like sample case walkthroughs demonstrating real-world application?

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