ARRHYTHMIAS IN THE ICU: DIAGNOSIS AND PRINCIPLES OF MANAGEMENT
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1 ARRHYTHMIAS IN THE ICU: DIAGNOSIS AND PRINCIPLES OF MANAGEMENT Nora Goldschlager, M.D. MACP, FACC, FAHA, FHRS SFGH Division of Cardiogy UCSF
2 CLINICAL VARIABLES IN ARRHYTHMOGENESIS Ischemia/infarction (scar) Electrolyte imbalance Proarrhythmia Autonomic nervous system QT interval Heart rate variability Baroreflex sensitivity
3 VENTRICULAR TACHYCARDIA Sustained (> 30 sec duration or immediately hemodynamically destabilizing) Nonsustained (< 30 sec duration) Monomorphic (same QRS configuration in given lead) Polymorphic (multiple QRS morphologies in given lead) Without long QT (generally ischemic) With long QT (Torsades de pointes)
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5 HEMODYNAMICALLY DESTABILIZING VT: CLINCAL CORRELATES Age Ejection fraction Rate Duration VA conduction Depressed baroreflex sensitivity
6 ACCELERATED VENTRICULAR RHYTHM Rates between idioventricular escape rate and VT (110/min) Classically has onset with slowing of sinus rate and offset with increase in sinus rate; isorhythmic AV dissociation common Classically has onset and offset with fusion complexes Thought to be automatic Usually lasts seconds; may last minutes to hours (rare) May indicate reperfusion injury in acute MI patients Not a rhythm of digitalis toxicity Benign
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8 MECHANISMS OF ARRHYTHMOGENESIS Abnormal automaticity Reentry Triggering (afterdepolarizations)
9 SOME ECG FEATURES OF VT MECHANISMS Automatic: Reentry: Afterdepolarizations: Warmup Warmdown Uniform morphology Monomorphic Polymorphic Usually nonsustained Pause dependency QTU prolongation U wave accentuation
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17 K + > 7.5 meq/dl
18 AFTERDEPOLARIZATIONS Early: Occur during repolarization Enhanced Ca ++ and Na + inflow Occurrence favored by long AP duration (e.g., Purkinje tissue), bradycardia, hypok +, hypomg ++, IA antiarrhythmic agents Arrhythmias suppressed by Mg ++ Delayed: Occurs after AP complete, during phase 4 Can be induced by digitalis, catecholamines, caffeine, histamine, cocaine Arrhythmias suppressed by Mg ++
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22 Post-extrasystolic u wave accentuation
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24 2G IV Mg++
25 V pacing
26 MIMICS OF VT Sinus tachycardia IVCD, including rate-dependent Hyperkalemia (sinoventricular conduction, wide QRS) Acute MI (ST segment elevation)
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32 ANTIARRHYTHMIC AGENTS IN ICU: VENTRICULAR ARRHYTHMIAS Lidocaine IV procainamide (monomorphic VT, normal QT) IV magnesium (Torsades de pointes,? Monomorphic VT) IV amiodarone IV β-blocker Cardiac pacing
33 TYPES OF SUPRAVENTRICULAR ARRHYTHMIAS Sinus node Sinus tachycardia (physiologic) Sinus node reentry (pathologic) Atrioventricular (AV)-node independent (originates in atrial myocardium) Atrial tachycardia Atrial flutter Atrial fibrillation AV-node dependent AV nodal reentrant tachycardia AV reentrant tachycardia Junctional tachycardia
34 ARRHYTHMIAS USUALLY NOT ASSOCIATED WITH ACUTE MYOCARDIAL INFARCTION Atrial tachycardia Reentrant supraventricular tachycardia Multifocal atrial tachycardia
35 PATHOGENESIS OF ATRIAL TACHYARRHYTHMIAS IN ACUTE MI Pericarditis Significant left ventricular dysfunction Bradycardia-tachycardia syndrome Enhanced sympathetic tone Sinus node and/or atrial infarction
36 ATRIAL TACHYCARDIAS Focal (automatic) Multifocal Interatrial reentry
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39 ATRIAL TACHYCARDIA Without AV block Congestive heart failure Pulmonary disease and its Rx Pericarditis With AV block Digitalis toxicity D/d atrial flutter
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41 REEENTRY SUPRAVENTRICULAR TACHYCARDIAS Interatrial reentry Atrial flutter (intraatrial reentry) AV node reentry AV reentry Orthodromic Antidromic
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46 ATRIAL FLUTTER Mimics: NSR Reentrant SVT IVCD VT ST elevation ST depression Electrical alternans
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53 ATRIAL FIBRILLIATION IN THE ICU Duration Diagnosis Onset Paroxysmal, persistent, chronic Rheumatic, nonrheumatic Lone New (acute), known recent, chronic
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56 MANAGEMENT STRATEGIES FOR AF IN THE ICU Ventricular rate control: IV β-blocker, Ca ++ channel blocker, digoxin, amiodarone Arrhythmia suppression: Rx underlying condition IA, IC, III agents
57 ADENOSINE: TACHYCARDIA RESPONSE Terminates AV nodal reentrant AV reentrant SA reentrant Atrial (interatrial reentrant) Not terminated, ventricular rate slowed AF Atrial flutter Atrial (ectopic) Not affected VT (most) Preexcited but not involving the AV node
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