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Contemporary Challenges in Sudden Cardiac Death, An Issue of Cardiac Electrophysiology Clinics, E-Book

Contemporary Challenges in Sudden Cardiac Death, An Issue of Cardiac Electrophysiology Clinics, E-Book

Mohammad Shenasa | N.A. Mark Estes III | Gordon F. Tomaselli

(2017)

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Book Details

Abstract

This issue of Cardiac Electrophysiology Clinics, edited by Drs. Mohammad Shenasa, N. A. Mark Estes III, and Gordon F. Tomaselli, will cover Contemporary Challenges in Sudden Cardiac Death. Topics covered in this issue include Pathophysiology; Basic electrophysiological mechanism; Channelopathy and Myopathy as causes of sudden cardiac death; Public access to defibrillation; Sudden cardiac death in children adolescence; Sudden cardiac death in specific cardiomyopathies; Ventricular arrhythmias and sudden cardiac death; lessons learned from cardiac implantable rhythm devices; future directions, and more.

Table of Contents

Section Title Page Action Price
Front Cover\r Cover
ContemporaryChallenges in SuddenCardiac Death\r i
Copyright\r ii
Contributors iii
CONSULTING EDITORS iii
EDITORS iii
AUTHORS iii
Contents vii
Foreword: Sudden Cardiac Death: Back to the Future vii
Preface: Sudden Cardiac Death: Contemporary Challenges vii
Sudden Cardiac Death: Interface Between Pathophysiology and Epidemiology vii
Basic Electrophysiologic Mechanisms of Sudden Cardiac Death Caused by Acute Myocardial Ischemia and Infarction vii
Channelopathies as Causes of Sudden Cardiac Death vii
Public Access Defibrillation: Is This Making Any Difference? Controversial Issues in Resuscitation from Cardiac Arrest vii
Sudden Cardiac Death During Sports Activities in the General Population viii
Sudden Cardiac Death in Children and Adolescents viii
Sudden Cardiac Death in Genetic Cardiomyopathies viii
Electrocardiographic Markers of Sudden Cardiac Death (Including Left Ventricular Hypertrophy) viii
Prediction and Prevention of Sudden Cardiac Death\r ix
Role of Cardiac Imaging in Evaluating Risk for Sudden Cardiac Death ix
Biomarkers to Predict Cardiovascular Death ix
Cardiac Innervation and the Autonomic Nervous System in Sudden Cardiac Death ix
Sudden Cardiac Death in Ischemic Heart Disease: Pathophysiology and Risk Stratification x
Ventricular Arrhythmias and Sudden Cardiac Death x
Heart Failure and Sudden Cardiac Death x
Sudden Cardiac Death in Acute Coronary Syndromes x
Neuromuscular Disease: Cardiac Manifestations and Sudden Death Risk xi
Sudden Cardiac Death: Lessons Learned from Cardiac Implantable Rhythm Devices xi
Primary Prevention Implantable Cardiac Defibrillator Trials: What Have We Learned? xi
The Subcutaneous Defibrillator xi
Future Directions: Management of Sudden Cardiac Death xi
CARDIAC ELECTROPHYSIOLOGY CLINICS\r xiii
FORTHCOMING ISSUES xiii
March 2018 xiii
June 2018 xiii
September 2018 xiii
RECENT ISSUES xiii
September 2017 xiii
June 2017 xiii
March 2017 xiii
Foreword\r xv
Sudden Cardiac Death: Back to the Future xv
Preface\r xvii
Sudden Cardiac Death: Contemporary Challenges xvii
Sudden Cardiac Death 515
Key points 515
INCIDENCE OF SUDDEN CARDIAC ARREST 516
CAUSES AND MECHANISMS OF CARDIAC ARREST 517
MECHANISTIC TARGETS DERIVED FROM EPIDEMIOLOGIC SUBDIVISIONS 520
MECHANISMS AND PATHOPHYSIOLOGY OF SUDDEN CARDIAC ARREST IN CORONARY HEART DISEASE 521
TRANSITION FROM MYOCARDIAL INSTABILITY TO LETHAL TACHYARRHYTHMIAS 523
ASYSTOLIC ARREST 523
PULSELESS ELECTRICAL ACTIVITY 523
REFERENCES 524
Basic Electrophysiologic Mechanisms of Sudden Cardiac Death Caused by Acute Myocardial Ischemia and Infarction 525
Key points 525
INTRODUCTION 525
THE ACUTE PHASE OF MYOCARDIAL ISCHEMIA AND INFARCTION 526
Effects of Ischemia on Ventricular Muscle Substrate Electrophysiology 526
Resting membrane potential 526
Phase 0 depolarization 527
Action potential duration and refractory period 528
Passive properties 528
Effects of ischemia on Purkinje cell substrate electrophysiology 528
Arrhythmogenic consequences of changes in ventricular muscle and Purkinje cell electrophysiology 529
Mechanisms of arrhythmias during acute ischemia 530
Reperfusion arrhythmias 533
REFERENCES 534
Channelopathies as Causes of Sudden Cardiac Death 537
Key points 537
LONG QT SYNDROME 537
Clinical Manifestations and Diagnosis 538
Role of Genetics 538
Therapy 538
β-blockers 538
Left cardiac sympathetic denervation 539
Implantable cardioverter defibrillator 539
Gene-specific management 540
CATECHOLAMINERGIC POLYMORPHIC VENTRICULAR TACHYCARDIA 540
Clinical Manifestation and Diagnosis 541
Risk Stratification 542
Therapy 542
BRUGADA SYNDROME 545
Clinical Manifestation and Diagnosis 545
Risk Stratification 545
Therapy 546
ACKNOWLEDGMENTS 546
REFERENCES 546
Public Access Defibrillation 551
Key points 551
INTRODUCTION 551
LAUNCHING OF BYSTANDER USE OF AUTOMATIC DEFIBRILLATORS: PUBLIC ACCESS DEFIBRILLATION 552
EQUIPPING OF POLICE VEHICLES AND TRAINING OF POLICE IN THE USE OF AUTOMATED EXTERNAL DEFIBRILLATORS 552
COMMUNITY-BASED STUDIES OF USE AND OUTCOME 552
CONCENTRATION OF SHOCKABLE CARDIAC ARRESTS IN PUBLIC LOCATIONS 553
CONTEMPORARY USE OF AUTOMATED EXTERNAL DEFIBRILLATORS IN CARDIAC ARRESTS WITNESSED IN PUBLIC LOCATIONS 553
OPPORTUNITIES FOR FURTHER IMPROVEMENT IN USE OF AUTOMATED EXTERNAL DEFIBRILLATORS IN ALL CARDIAC ARRESTS OCCURRING IN PUBLI ... 554
CIRCULATORY PHASE OF CARDIAC RESUSCITATION IN RELATION TO SHOCK AND USE OF AUTOMATED EXTERNAL DEFIBRILLATORS 554
CONTROVERSIAL AND NONCONTROVERSIAL ASPECTS OF CARDIOPULMONARY RESUSCITATION 555
SUMMARY 556
REFERENCES 556
Sudden Cardiac Death During Sports Activities in the General Population 559
Key points 559
SPORTS ACTIVITY: CONCLUSIVELY BENEFICIAL FOR LONG-TERM SUDDEN CARDIAC DEATH RISK 560
SUDDEN DEATH IN THE YOUNG COMPETITIVE ATHLETE: THE APPARENT PART OF THE ICEBERG 561
SUDDEN CARDIAC DEATH AMONG RECREATIONAL SPORTS PARTICIPANTS: THE MAJORITY OF SPORTS-RELATED SUDDEN CARDIAC DEATH 561
SPORTS-RELATED SUDDEN CARDIAC DEATH PRESENTS WITH HIGHLY HOMOGENOUS CHARACTERISTICS 562
HOW TO TACKLE SPORTS-RELATED SUDDEN CARDIAC DEATH? 562
SUMMARY 564
REFERENCES 564
Sudden Cardiac Death in Children and Adolescents 569
Key points 569
INTRODUCTION 569
EPIDEMIOLOGY 570
ETIOLOGIES 571
Structural Heart Disease 571
Arrhythmia Syndromes 573
Other 574
AUTOPSY FINDINGS 574
GENETIC TESTING 574
CASCADE SCREENING 574
COMMUNITY SCREENING 576
SPECIAL POPULATIONS 576
Athletes 576
Stimulant Medications 576
TREATMENT 576
Exercise 577
SUMMARY 577
REFERENCES 577
Sudden Cardiac Death in Genetic Cardiomyopathies 581
Key points 581
DILATED CARDIOMYOPATHY 581
Epidemiology 581
Genetic Causes of Dilated Cardiomyopathy 581
Clinical Presentation 582
Incidence of Sudden Cardiac Death in Dilated Cardiomyopathy 582
Risk Stratification for Sudden Cardiac Death in Dilated Cardiomyopathy 583
Genetic risk-stratifying features in dilated cardiomyopathy 583
Clinical risk-stratifying features in dilated cardiomyopathy 583
Treatment of Sudden Cardiac Death Prevention 583
Medical treatment 583
Role of implantable cardioverter-defibrillators 583
Exercise and Sudden Cardiac Death Risk in Dilated Cardiomyopathy 586
HYPERTROPHIC CARDIOMYOPATHY 586
Epidemiology 586
Clinical Presentation and Clinical Diagnosis 586
Genetic Diagnosis 586
Incidence of Sudden Cardiac Death in Hypertrophic Cardiomyopathy 586
Risk Stratification of Sudden Cardiac Death in Hypertrophic Cardiomyopathy 587
Treatment of Prevention of Sudden Cardiac Death in Hypertrophic Cardiomyopathy 590
General measures and medical treatment 590
Invasive treatment of left ventricular outflow tract obstruction 591
Role of implantable cardioverter-defibrillators to reduce sudden cardiac death 591
Exercise and Sudden Cardiac Death Risk in Hypertrophic Cardiomyopathy 592
ARRHYTHMOGENIC RIGHT VENTRICULAR CARDIOMYOPATHY 592
Epidemiology 592
Clinical Presentation and Clinical Diagnosis 593
Genetic Diagnosis 593
Incidence of Sudden Cardiac Death in Arrhythmogenic Right Ventricular Cardiomyopathy 593
Risk Stratification of Sudden Cardiac Death in Arrhythmogenic Right Ventricular Cardiomyopathy 593
Genetic Risk Stratification 595
Treatment for Prevention of Sudden Cardiac Death in Arrhythmogenic Right Ventricular Cardiomyopathy 595
Medical treatment 595
Role of implantable cardioverter-defibrillators 595
Exercise and Sudden Cardiac Death in Arrhythmogenic Right Ventricular Cardiomyopathy 596
REFERENCES 598
Electrocardiographic Markers of Sudden Cardiac Death (Including Left Ventricular Hypertrophy) 605
Key points 605
MAIN CAUSES OF SUDDEN CARDIAC DEATH 605
ELECTROCARDIOGRAPHIC MARKERS OF SUDDEN CARDIAC DEATH: ROLE OF THE ELECTROCARDIOGRAM AS A PART OF A RISK STRATIFICATION OF S ... 606
Electrocardiographic Markers of Repolarization Abnormalities in Sudden Cardiac Death 606
The QT interval or electric systole 606
Prolonged corrected QT interval 608
Measurement of the QT interval 608
Prolonged JT-JTc 608
Prolonged QT Dispersion 608
Early Repolarization 609
Early repolarization or inferolateral J-point elevation 609
Early Repolarizations Electrocardiographic Variants 609
J wave amplitude of 0.2 mV of greater 609
Interval from the Peak to the End of the T Wave or Tpe 610
RISK PREDICTION OF VENTRICULAR ARRHYTHMIAS AFTER MYOCARDIAL INFARCTION 612
The Tpeak–Tend/QT Ratio 613
Macrowave T Wave Alternans or Macroscopic T Wave Alternans 614
Micro T Wave Alternans 614
ELECTROCARDIOGRAPHIC MARKERS OF SUDDEN CARDIAC DEATH: DEPOLARIZATION ABNORMALITIES 615
Prolongation QRS Duration 615
Right Precordial QRS Duration Prolongation (Parietal Block) 616
An S-Wave 0.1 mV or Greater and/or 40 ms or Greater in Lead I 616
QT Dispersion 617
Narrow QRS, Fragmented QRS Complex/Wide QRS Fragmentation 617
Narrow QRS fragmentation definition 617
Wide fQRS definition 617
Observation 618
Technical problems that affect fragmented QRS complexes 618
Major causes of fragmented QRS complexes 618
Congenital heart disease 618
Tetralogy of Fallot in adults 618
Channelopathies 618
Hereditary cardiomyopathies 619
Acquired diseases 619
Epsilon Wave or Fontaine Wave 620
Classification of Epsilon Waves by the Number of Deflections 621
Sensitivity of Electrocardiography for the Detection of Epsilon Wave Frequency in Arrhythmogenic Right Ventricular Cardiomy ... 621
Prognostic Significance of the Epsilon Wave in Arrhythmogenic Right Ventricular Cardiomyopathy/Dysplasia 621
Sarcoidosis 622
Brugada syndrome 622
Pathognomonic Features 622
Physiologic Epsilon Waves 622
Ventricular hypertrophy in elite endurance senior athletes 622
Pathologic Epsilon waves 622
Epsilon Wave and Relationship to Ventricular Tachycardia 623
PRESENCE OF VENTRICULAR LATE POTENTIALS USING HIGH-RESOLUTION OR SIGNAL-AVERAGED ELECTROCARDIOGRAPHY 624
Value of the Signal-Averaged Electrocardiogram in the Diagnosis of Arrhythmogenic Right Ventricular Cardiomyopathy/Dysplasia 624
Electrocardiographic predictor of sudden death in left ventricular hypertrophy 624
Advantages of the electrocardiograph for the diagnosis of left ventricular hypertrophy 624
SUMMARY 625
ACKNOWLEDGMENTS 625
REFERENCES 625
Prediction and Prevention of Sudden Cardiac Death 631
Key points 631
INTRODUCTION 631
ISCHEMIC HEART DISEASE 632
NONISCHEMIC CARDIOMYOPATHY 633
Beyond Left Ventricular Ejection Fraction: Further Risk Stratification for Sudden Cardiac Death in Nonischemic Cardiomyopathy 633
Prevention of Sudden Cardiac Death in Nonischemic Cardiomyopathy 634
RISK STRATIFICATION OF SUDDEN CARDIAC DEATH IN INHERITED CHANNELOPATHIES 634
The Long QT Syndrome 635
Brugada Syndrome 635
Catecholaminergic Polymorphic Ventricular Tachycardia 636
Short QT Syndrome 636
Early Repolarization Syndrome 636
SUDDEN CARDIAC DEATH IN THE ATHLETE 636
SUMMARY 637
REFERENCES 637
Role of Cardiac Imaging in Evaluating Risk for Sudden Cardiac Death 639
Key points 639
INTRODUCTION 639
CONCEPTS IN RISK STRATIFICATION 639
CARDIAC IMAGING AND SUDDEN CARDIAC DEATH PATHOPHYSIOLOGY 640
EVALUATION OF ARRHYTHMIC SUBSTRATES 640
Left Ventricular Systolic Function 641
Left Ventricular Size 642
Strain Echocardiography 642
Radionuclide Imaging 642
Cardiac Magnetic Resonance 643
MYOCARDIAL SYMPATHETIC DENERVATION AND THE RISK OF SUDDEN CARDIAC DEATH 645
SUMMARY 645
REFERENCES 645
Biomarkers to Predict Cardiovascular Death 651
Key points 651
BIOMARKERS OF CARDIOVASCULAR DEATH IN THE GENERAL POPULATION 651
Metabolic 651
Inflammatory and Prothrombotic Markers 652
Renal Dysfunction 653
Electrolytes 653
Myocardial Markers 653
Multimarker Strategy 653
BIOMARKERS OF CARDIOVASCULAR DEATH IN CORONARY ARTERY DISEASE 654
Inflammation 654
Oxidative Stress 654
Cellular Stress 654
Neurohormonal 654
Hypercoagulability 655
Myocardial Markers 655
Repair and Regeneration: Role of Progenitor Cells 655
Multimarker Risk Score 655
BIOMARKERS OF SUDDEN CARDIAC DEATH IN HEART FAILURE 656
Hemodynamic Stress 658
Myocardial Stress 658
Neurohormonal 658
FUTURE DIRECTIONS 658
SUMMARY 658
REFERENCES 658
Cardiac Innervation and the Autonomic Nervous System in Sudden Cardiac Death 665
Key points 665
INTRODUCTION 665
ANATOMY 665
Sympathetic Efferent Neurotransmission 666
Parasympathetic Efferent Neurotransmission 666
Neural Afferent Neurotransmission 667
Neural Circuits 667
AUTONOMIC NERVOUS SYSTEM AND CARDIAC PATHOPHYSIOLOGY 667
Response to Sympathetic Activation 667
Parasympathetic Activation 667
NEURAL REMODELING IN THE SETTING OF MYOCARDIAL INFARCTION 668
Denervation 668
Hyperinnervation 669
Neural Remodeling of the Cardiac and Extracardiac Ganglia 669
NEURAXIAL MODULATION TO REDUCE RISK OF SUDDEN CARDIAC DEATH 669
Modulation of the Sympathetic Nervous System 669
Chemical blockade 669
Cardiac resynchronization therapy 670
Thoracic epidural anesthesia 670
Spinal cord stimulation 670
Cardiac sympathetic denervation/decentralization 671
Renal sympathetic denervation 671
Modulation of the Parasympathetic Nervous System 671
Vagal nerve stimulation 671
Tragus nerve stimulation 672
Baroreceptor activation therapy 673
SUMMARY 673
REFERENCES 673
Sudden Cardiac Death in Ischemic Heart Disease 681
Key points 681
INTRODUCTION 681
PATHOPHYSIOLOGY OF SUDDEN CARDIAC DEATH IN ISCHEMIC HEART DISEASE 682
REMODELING AFTER MYOCARDIAL INFARCTION AND SUDDEN CARDIAC DEATH 683
CURRENT RISK STRATIFICATION OF SUDDEN CARDIAC DEATH IN ISCHEMIC HEART DISEASE 684
SURROGATE MEASURES OF CONDUCTION DISORDERS 685
IMAGING AND QUANTIFICATION OF MYOCARDIAL SCAR 685
SURROGATE MEASURES OF DISPERSION OF REPOLARIZATION 685
SURROGATE MEASURES OF AUTONOMIC FUNCTION 686
IMAGING OF CARDIAC SYMPATHETIC INNERVATION 686
AMBULATORY MONITORING 686
ELECTROPHYSIOLOGIC STUDY 686
BIOMARKERS 687
GENOMICS 687
NONINVASIVE CLINICAL RISK VARIABLES 687
SUMMARY 688
REFERENCES 688
Ventricular Arrhythmias and Sudden Cardiac Death 693
Key points 693
INTRODUCTION 693
ISCHEMIC CARDIOMYOPATHY 694
NONISCHEMIC CARDIOMYOPATHY 695
HYPERTROPHIC CARDIOMYOPATHY 697
ARRHYTHMOGENIC RIGHT VENTRICULAR CARDIOMYOPATHY 698
REPAIRED CONGENITAL HEART DISEASE 700
BRUGADA SYNDROME 700
LONG QT SYNDROME 701
SHORT QT SYNDROME 702
CATECHOLAMINERGIC POLYMORPHIC VENTRICULAR TACHYCARDIA 702
EARLY REPOLARIZATION PATTERNS 703
IDIOPATHIC VENTRICULAR TACHYCARDIA 703
FUTURE DIRECTIONS 703
SUMMARY 703
REFERENCES 703
Heart Failure and Sudden Cardiac Death 709
Key points 709
INTRODUCTION 709
RISK STRATIFICATION: BEYOND THE LEFT VENTRICULAR EJECTION FRACTION 710
MRI: DELAYED ENHANCEMENT: METAIODOBENZYLGUANIDINE 711
MEDICAL THERAPIES FOR REDUCTION OF MORTALITY IN PATIENTS WITH HEART FAILURE 711
DEVICE AND ABLATIVE STRATEGIES FOR REDUCTION OF MORTALITY IN PATIENTS WITH HEART FAILURE 713
Primary Prevention Implantable Cardioverter-Defibrillator Trial Data 713
Landmark Primary Prevention Cardiac Resynchronization Therapy Trial Data 714
Summary 716
WEARABLE CARDIOVERTER DEFIBRILLATOR 716
Summary 717
ANTIARRHYTHMIC DRUGS AND ABLATION FOR VENTRICULAR TACHYCARDIA IN HEART PATIENTS WITH FAILURE 717
NONISCHEMIC CARDIOMYOPATHIES 718
Dilated Cardiomyopathy 718
Right Ventricular Cardiomyopathies 718
Summary 718
END-OF-LIFE CARE 719
REFERENCES 719
Sudden Cardiac Death in Acute Coronary Syndromes 725
Key points 725
INTRODUCTION 725
SUDDEN CARDIAC ARREST AS INITIAL MANIFESTATION OF AN ACUTE CORONARY SYNDROME 725
IN-HOSPITAL COMPLEX VENTRICULAR ARRHYTHMIAS 725
PROGNOSTIC SIGNIFICANCE OF IN-HOSPITAL COMPLEX VENTRICULAR ARRHYTHMIAS 726
ACUTE TREATMENT OF VENTRICULAR TACHYARRHYTHMIAS IN THE SETTING OF ACUTE CORONARY SYNDROMES 726
OTHER MEASURES FOR MANAGEMENT OF VENTRICULAR TACHYARRHYTHMIAS IN PATIENTS WITH ACUTE CORONARY SYNDROMES 727
CATHETER ABLATION IN THE ACUTE SETTING 727
IMPLANTABLE CARDIOVERTER-DEFIBRILLATOR 727
SUMMARY 728
REFERENCES 728
Neuromuscular Disease 731
Key points 731
INTRODUCTION AND GENERAL PRINCIPLES 731
MUSCULAR DYSTROPHIES, CARDIAC ARRHYTHMIAS, AND SUDDEN CARDIAC DEATH 731
Myotonic Dystrophy 732
Genetics and molecular pathogenesis 732
Epidemiology and clinical features 734
Cardiac involvement: evaluation and management 735
Muscular Dystrophies: Duchenne and Becker 739
Epidemiology and genetics 739
Clinical manifestations and progression 739
Cardiovascular manifestations and management 739
Emery-Dreifuss Muscular Dystrophy and Associated Disorders 740
Genetics and cardiac pathology 740
Clinical presentation 741
Cardiovascular manifestations and management 741
Limb-Girdle Muscular Dystrophy 742
Epidemiology and genetics 742
Clinical features 742
Cardiac manifestations and management 742
SUMMARY/FUTURE DIRECTIONS 743
REFERENCES 743
Sudden Cardiac Death 749
Key points 749
INTRODUCTION 749
ESTABLISHMENT OF IMPLANTABLE CARDIOVERTER–DEFIBRILLATOR DEVICES 750
Secondary Prevention Implantable Cardioverter–Defibrillator Trials 750
Primary Prevention Implantable Cardioverter–Defibrillator Trials 750
THE NEGATIVE LESSONS 753
Use of Implantable Cardioverter–Defibrillators: Current Trends 753
Performance of Left Ventricular Ejection Fraction as a Risk Stratification Tool 753
Value of the Left Ventricular Ejection Fraction Compared with Other Risk Factors and Markers 755
Implantable Cardioverter–Defibrillator Therapy in Underrepresented Subgroups and Role of Comorbidities 755
SUMMARY 757
REFERENCES 757
Primary Prevention Implantable Cardiac Defibrillator Trials 761
Key points 761
INTRODUCTION 761
PRIMARY PREVENTION IMPLANTABLE CARDIOVERTER-DEFIBRILLATORS IN ISCHEMIC CARDIOMYOPATHY, 1990S 762
PRIMARY PREVENTION IMPLANTABLE CARDIOVERTER-DEFIBRILLATORS IN ISCHEMIC CARDIOMYOPATHY, 2000S 768
PRIMARY PREVENTION IMPLANTABLE CARDIOVERTER-DEFIBRILLATORS IN NONISCHEMIC CARDIOMYOPATHY 770
EVIDENCE THAT BENEFIT FROM IMPLANTABLE CARDIOVERTER-DEFIBRILLATORS IS NOT UNIFORMLY DISTRIBUTED IN TESTED POPULATIONS 771
SUMMARY 771
REFERENCES 772
The Subcutaneous Defibrillator 775
Key points 775
INTRODUCTION 775
THE SUBCUTANEOUS DEFIBRILLATOR 776
SUBCUTANEOUS IMPLANTABLE CARDIOVERTER-DEFIBRILLATOR EFFICACY 777
PROCEDURAL COMPLICATIONS 778
INAPPROPRIATE SHOCKS 780
SUBCUTANEOUS IMPLANTABLE CARDIOVERTER-DEFIBRILLATOR LIMITATIONS 780
COMPARISON WITH TRANSVENOUS IMPLANTABLE CARDIOVERTER-DEFIBRILLATOR 781
SUMMARY 781
REFERENCES 781
Future Directions 785
Key points 785
INTRODUCTION 785
NATIONAL CARDIAC ARREST REGISTRY 785
FOSTERING A CULTURE OF ACTION 787
OPTIMIZING EMERGENCY MEDICAL SERVICE SYSTEM CAPABILITIES AND PERFORMANCE 787
OPTIMIZING HOSPITAL PERFORMANCE 788
ACCELERATING RESEARCH 788
STRUCTURED COLLABORATION 789
SUMMARY 789
REFERENCES 789