Contents

Foreword vii

Preface ix

Acknowledgements xi

1. Diagnostics and Therapy by the ICD: Better than the Cardiologist? 1

Historical Perspective of Diagnostic Information in ICDs 1

The Diagnosis of Ventricular Tachycardia: A Continuing Story with a Happy End? 2

References 5

2. Rhythm Classification by Arrhythmia Management Devices 7

Verification of Signals During Implantation 8

Early Devices: Detection of Ventricular Fibrillation 9

Rate-only Detection 10

Detection Zones 11

Interval-based Discriminators 12

Dual-chamber Discrimination 13

The Atrioverter: Detection of Atrial Tachyarrhythmias 17

Morphology-based Algorithms 18

References 20

3. Device Diagnostics: Interval Tables, Event Counters, Interval Plots, Markers, Electrograms, and New Features 23

Interval Tables and Event Counters 24

Electrograms 25

Interval Plots (Tachograms) 29

Event Markers, Marker Channels™, Status Channel 31

New Features 34

Conclusion 37

References 38

4. Understanding Stored Electrograms 39

Electrogram Sources 39

Visual Analysis of Stored Electrograms 41

Application of Information Blocks in Relation to Rate Branches 46

A Standardized Approach for Electrogram Analysis SQ

A Practical Approach to Analyze Electrograms S1

References S1

5. A Practical Approach to Analyze Stored Electrograms SS

Stored Electrograms in Single-chamber Devices SS

Stored Electrograms in Dual-chamber Devices SS

6. Clinical Case Studies S9

Early Devices 6Q

Single Chamber Devices 66

Dual Chamber Devices S2

Resynchronization Devices 11S

Atrial Management Devices 131

Interval Plots 13S

Challenging Surface Electrocardiograms 16S

Index 191

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