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Dual Chamber Discriminators: PR Logic Rules
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)
