PR Logic detection algorithms comparison
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The document describes the rhythm detection algorithms in Medtronic implantable cardioverter defibrillators. It outlines the rhythm detection criteria used by the PR Logic algorithm, including regularity, pattern, and rate thresholds to detect ventricular fibrillation, ventricular tachycardia, atrial fibrillation, sinus tachycardia and other rhythms. Newer devices add ST criteria. Protecta devices additionally apply wavelet analysis to detect abnormal morphology if other criteria are not met, to classify rhythms as sinus tachycardia or ventricular tachycardia. PR Logic is applied before wavelet analysis except for detection of double tachycardia.
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PR Logic detection algorithms comparison
- 1. Confidential and Proprietary; Do Not Copy or Distribute PR Logic® (Pre EnTrust) Regular > 75% Irregular ≤ 50% = VF + SVT = VT + SVT = SVT = SVT = SVT = SVT AFEvidence AVD issociation R egularity If no SVT criteria or Double Tach Criteria are met, VT/FVT/VF is detected Pattern R ate VF/FVT Double Tach VT/FVT Regular Conduction AFib/AFlutter Irregular Conduction Sinus Tach Other 1:1
- 2. Confidential and Proprietary; Do Not Copy or Distribute PR Logic® (EnTrust and newer) AFEvidence AVD issociation R egularity EnTrust and newer devices have New ST Rule Pattern R ate VF/FVT Double Tach VT/FVT Regular Conduction AFib/AFlutter Irregular Conduction Sinus Tach Other 1:1 STEvidence Irregular ≤ 50% Regular > 75%
- 3. Confidential and Proprietary; Do Not Copy or Distribute PR Logic® with Wavelet (Protecta) AFEvidence AVD issociation R egularity If non of these are met, then Wavelet will try to see if it can call it SVT Pattern R ate VF/FVT Double Tach VT/FVT Regular Conduction AFib/AFlutter Irregular Conduction Sinus Tach Other 1:1 Abnorm al M orphology Irregular ≤ 50% Regular > 75% STEvidence
- 4. Confidential and Proprietary; Do Not Copy or Distribute PR Logic and Wavelet in Protecta Except for Double Tach PR Logic is applied first and then Wavelet (as long as the V is not faster than the A)
Editor's Notes
- Say: The operation of both PR Logic and Wavelet SVT discrimination features remain unchanged, however minor modifications were made to allow for the sequential application of Wavelet after PR Logic, for those rhythms with atrial rates fast enough to be considered SVT. The combined detection algorithm includes the four PR Logic criteria plus the Wavelet criterion as the lowest priority SVT criterion. The PR Logic double tachycardia criterion was modified to require abnormal morphology and the Wavelet criterion was modified to apply only when the V-V intervals >= A-A intervals. (see Table)