Atrioventricular Interval Search:

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Atrioventricular Interval Search
A Dual Chamber Pacemaker Feature to Promote
Intrinsic A-V Conduction

• Russell Silverman, MD
• Heart Care Center, Fayetteville, NY

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Clinical Issue

• For patients with intact or intermittent AV
  conduction, fixed AV delays may inappropriately
  promote ventricular pacing or fusion/pseudofusion
  beats, resulting in reduced ventricular filling
  and decreased pacemaker longevity.

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Search AV Operation

• Search AV periodically measures AV intervals
• Adapts PAV/SAV to encourage intrinsic conduction

Search AV extension
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How does Search AV work?
Operating AV (PAV/SAV)
Just Right (Preferred VS Window)
AP or AS
Too Early
Too Late
55 ms
15 ms
VP
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Search AV Study Objective

• To determine the effect of Search AV delay in
  reducing unnecessary ventricular pacing,
  especially in patients with 11 conduction.

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Patient Population

• 283 (187 male, 96 female) - Medtronic.Kappa 700
  Clinical
• Age 68 /- 13 years
• Kappa 700 DDD/R with Search AV On
• Indication Breakdown
• SSS (27.9)
• SSSAV Block and/ or BBB (36.4)
• AV conduction block and/or BBB (33.9)
• Other (1.8)

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Search AV Study Methods
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Search AV Data Analyses
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Search AV Results
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Search AV Results
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Search AV Results
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Conclusion

• The Adaptive Search AV feature in the
  Medtronic.Kappa 700 Pacing Series significantly
  increases ventricular sensing in DDD/R mode
  indicated patients, and
• Enhances pacemaker longevity by reducing
  ventricular pacing.