Canadian Syncope Risk Score (CSRS) Calculator


Canadian Syncope Risk Score (CSRS) Calculator
Predisposition to vasovagal symptoms Triggered by being in a warm crowded place, prolonged standing, fear, emotion, or pain
Heart disease history CAD, atrial fibrillation or flutter, CHF, valvular disease
sBP <90 or >180 mmHg On any reading
Elevated troponin >99th percentile of normal population
Abnormal QRS axis <-30° or >100°
QRS duration >130 ms
Corrected QT interval >480 ms

Hold on to your stethoscopes, folks! We’re about to embark on a thrilling journey into the exhilarating world of… syncope risk scores? Yes, you heard right! Stick around, it’s going to be more exciting than you think.

The Canadian Syncope Risk Score (CSRS) is a statistical model used by the medical fraternity to predict the 30-day risk of serious adverse events following syncope, which is just medical jargon for fainting spells.

CSRS = sum(score for each risk factor)

CSRS Categories and Interpretation

CSRS Score Risk Level Interpretation
0-3 Low Risk Minimal risk of serious adverse events
4-5 Medium Risk Moderate risk of serious adverse events
6+ High Risk High risk of serious adverse events

Calculation Examples

Meet Bob and Alice. Bob has a history of heart conditions which earns him 3 points and an abnormal ECG adds another point. That’s a total of 4 – Medium Risk!

Alice, on the other hand, is dealing with shortness of breath which gives her 2 points – Low Risk!

Individual CSRS Score Calculation Interpretation
Bob 3 (history of heart conditions) + 1 (abnormal ECG) = 4 Medium Risk
Alice 2 (shortness of breath) = 2 Low Risk

Calculation Methods

Method Advantages Disadvantages Accuracy
Manual Calculation Accessible, No technology required Time-consuming High
CSRS Calculator Time-saving, Convenient Requires technology Very High

CSRS Evolution

Year Evolution
2016 Introduction of CSRS
2018 Validation of CSRS in independent populations
2020 Integration of CSRS into clinical practice guidelines

Limitations of CSRS

  1. Subjectivity: The scoring system is based on clinical judgement, which can vary between physicians.
  2. Exclusion of Certain Populations: The CSRS has not been validated in children or pregnant women.
  3. Limited External Validation: External validation studies are limited.

Alternative Methods

Method Advantages Disadvantages
San Francisco Syncope Rule Easy to remember, Well-studied Less accurate than CSRS
Boston Syncope Rule Includes more risk factors More complex than CSRS


  1. What is the CSRS? The CSRS is a statistical model used to predict the 30-day risk of adverse events following syncope.
  2. How is the CSRS calculated? The CSRS is calculated by summing up the scores for each risk factor present in a patient.
  3. Who can use the CSRS? The CSRS can be used by healthcare professionals to assess the risk of serious adverse events in patients who have experienced syncope.
  4. What are the risk factors considered in the CSRS? The risk factors in the CSRS include age, heart conditions, clinical symptoms, and various indicators from medical tests.
  5. Why is the CSRS important? The CSRS helps in making informed decisions about the need for hospital admission after a syncope episode.
  6. Can the CSRS be used in children? Currently, the CSRS has not been validated in children or pregnant women.
  7. Are there alternatives to the CSRS? Yes, alternatives to the CSRS include the San Francisco Syncope Rule and the Boston Syncope Rule.
  8. How accurate is the CSRS? While the CSRS provides a good indication of risk, it is not 100% accurate as it relies on clinical judgement which can vary between physicians.
  9. What is a low risk CSRS score? A CSRS score of 0-3 is considered low risk.
  10. Is there a calculator for the CSRS? Yes, online calculators are available to quickly calculate the CSRS.


  1. Canadian Cardiovascular Society
    • A comprehensive resource for cardiovascular health, including CSRS.
  2. University of Ottawa
    • The university where the CSRS was developed.