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Updated: Sep 14, 2025
10:26
A Multicenter MRI Protocol for the Evaluation and Quantification of Deep Vein Thrombosis
Published on: June 2, 2015
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Validation of the ToDay, a simplified diagnostic algorithm for deep vein thrombosis
Sasha Sharma1, Linnea Soon2, Kerstin de Wit3
1Department of Statistics, University of British Columbia, Vancouver, British Columbia, Canada.
Journal of Thrombosis and Haemostasis : JTH
|July 18, 2025
Summary
The ToDay algorithm offers a safe and efficient way to diagnose deep vein thrombosis (DVT), reducing the need for ultrasounds. This simplified approach improves clinical practice adherence for DVT diagnosis.
Area of Science:
- Medical Diagnostics
- Clinical Decision Support
- Thrombosis Research
Background:
- Current deep vein thrombosis (DVT) diagnostic algorithms face low adherence due to complexity.
- Simplified diagnostic strategies are crucial for improving clinical practice and accuracy.
- The ToDay algorithm integrates physician assessment with D-dimer testing for a streamlined DVT diagnosis.
Purpose of the Study:
- To validate the efficacy of the ToDay algorithm using existing data.
- To assess the ToDay algorithm's performance in a real-world clinical setting.
- To evaluate the algorithm's impact on diagnostic workflow and resource utilization.
Main Methods:
- Retrospective analysis of data from the 4D study (NCT02038530).
- The ToDay algorithm was applied, considering DVT likelihood and D-dimer levels (including age-adjusted thresholds).
- Primary outcome: 90-day symptomatic venous thromboembolism (VTE); Secondary outcome: avoidance of ultrasound imaging.
Main Results:
- The ToDay algorithm excluded DVT in 1334 patients, with a 0.75% VTE failure rate.
- Deep vein thrombosis (DVT) was diagnosed in 10.9% (163/1497) of patients.
- 38.6% of patients avoided the need for ultrasound imaging.
Conclusions:
- The ToDay algorithm is a safe and effective alternative for DVT diagnosis, simplifying the process.
- It significantly reduces the reliance on ultrasound imaging, enhancing efficiency in emergency settings.
- Prospective validation is recommended prior to widespread clinical adoption of the ToDay algorithm.
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