Ventricular tachycardia treatment: Difference between revisions
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'''5.''' For recurrent [[ventricular tachyarrhythmias]] or nontachyarrhythmic mechanisms of [[cardiac arrest]], it is recommended to follow the algorithms contained in the documents on CPR<ref name="pmid16314375">{{cite journal| author=ECC Committee, Subcommittees and Task Forces of the American Heart Association| title=2005 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. | journal=Circulation | year= 2005 | volume= 112 | issue= 24 Suppl | pages= IV1-203 | pmid=16314375 | doi=10.1161/CIRCULATIONAHA.105.166550 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16314375 }} </ref><ref name="pmid16321716">{{cite journal| author=Nolan JP, Deakin CD, Soar J, Böttiger BW, Smith G, European Resuscitation Council| title=European Resuscitation Council guidelines for resuscitation 2005. Section 4. Adult advanced life support. | journal=Resuscitation | year= 2005 | volume= 67 Suppl 1 | issue= | pages= S39-86 | pmid=16321716 | doi=10.1016/j.resuscitation.2005.10.009 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16321716 }} </ref> developed by the AHA in association with ILCOR and/or the ERC. ''([[ACC AHA guidelines classification scheme#Level of Evidence|Level of Evidence: C]])'' | '''5.''' For recurrent [[ventricular tachyarrhythmias]] or nontachyarrhythmic mechanisms of [[cardiac arrest]], it is recommended to follow the algorithms contained in the documents on CPR<ref name="pmid16314375">{{cite journal| author=ECC Committee, Subcommittees and Task Forces of the American Heart Association| title=2005 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. | journal=Circulation | year= 2005 | volume= 112 | issue= 24 Suppl | pages= IV1-203 | pmid=16314375 | doi=10.1161/CIRCULATIONAHA.105.166550 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16314375 }} </ref><ref name="pmid16321716">{{cite journal| author=Nolan JP, Deakin CD, Soar J, Böttiger BW, Smith G, European Resuscitation Council| title=European Resuscitation Council guidelines for resuscitation 2005. Section 4. Adult advanced life support. | journal=Resuscitation | year= 2005 | volume= 67 Suppl 1 | issue= | pages= S39-86 | pmid=16321716 | doi=10.1016/j.resuscitation.2005.10.009 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16321716 }} </ref> developed by the AHA in association with ILCOR and/or the ERC. ''([[ACC AHA guidelines classification scheme#Level of Evidence|Level of Evidence: C]])'' | ||
'''6.''' Reversible causes and factors contributing to [[cardiac arrest]] should be managed during advanced life support, including management of [[hypoxia]], [[electrolyte disturbances]], | '''6.''' Reversible causes and factors contributing to [[cardiac arrest]] should be managed during advanced life support, including management of [[hypoxia]], [[Electrolyte disturbance|electrolyte disturbances]], mechanical factors, and [[volume depletion]]. ''([[ACC AHA guidelines classification scheme#Level of Evidence|Level of Evidence: C]])'' | ||
====[[ACC AHA guidelines classification scheme#Classification of Recommendations|Class IIa]]==== | ====[[ACC AHA guidelines classification scheme#Classification of Recommendations|Class IIa]]==== | ||
Revision as of 22:58, 15 September 2011
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-in Chief: Avirup Guha, M.B.B.S.[2]
Treatment of ventricular tachycardia
Therapy may be directed at either terminating an episode of the arrhythmia or for suppressing a future episode from occurring. The treatment is tailored to the specific patient, with regard to how well the individual tolerates episodes of ventricular tachycardia, how frequently episodes occur, their comorbidities, and their wishes. The guideline which was decided for tachyarrhythmia by AHA in 2010 is as follows:
The details of the guidelines(2005 and 2010) are explained better in the guidelines section later in this article
Electrical Cardioversion / Defibrillation
It is usually possible to terminate a VT episode with a direct current shock across the heart. This is ideally synchronised to the patient's heartbeat. As it is quite uncomfortable, shocks should be delivered only to an unconscious or sedated patient. A patient with pulseless VT will be unconscious and treated as an emergency on a cardiac arrest protocol. Elective cardioversion is usually performed in controlled circumstances with anaesthetic and airway support.
The shock may be delivered to the outside of the chest using an external defibrillator, or internally to the heart by an implantable cardioverter-defibrillator (ICD) if one has previously been inserted.
An ICD may also be set to attempt to overdrive pace the ventricle. Pacing the ventricle at a rate faster than the underlying tachycardia can sometimes be effective in terminating the rhythm. If this fails after a short trial, the ICD will usually stop pacing, charge up and deliver a defibrillation grade shock.
Antiarrhythmic drug therapy
Drugs such as amiodarone, epinephrine and vasopressin may be used in addition to defibrillation to terminate VT while the underlying cause of the VT can be determined. Possible causes or contributing factors to VT can be remembered as the six H's and five T's: Hypovolemia, Hypoxia, Hydrogen ion (acidosis), Hypo- or Hyperglycemia, Hypothermia; and Toxins, Tamponade (cardiac), Tension pneumothorax, Thrombosis, Trauma.
Long term anti-arrhythmic therapy may be indicated to prevent recurrence of VT. Beta-blockers and a number of class III anti-arrhythmics are commonly used.
For some of the rare congenital syndromes of VT, other drugs, and sometimes even catheter ablation therapy may be useful.
The implantation of an ICD is more effective than drug therapy for prevention of sudden cardiac death due to VT and VF, but may be constrained by cost issues, and well as patient co-morbidities and patient preference.
Guidelines in Ventricular Tachycardia Treatment[1]
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Recommendations in Ablation of Ventricular TachycardiaClass I1. Ablation is indicated in patients who are otherwise at low risk for Sudden Cardiac Death(SCD) and have sustained predominantly monomorphic ventricular tachycardia that is drug resistant, who are drug intolerant, or who do not wish long-term drug therapy.(Level of Evidence: C) 2. Ablation is indicated in patients with Bundle branch reentrant ventricular tachycardia.(Level of Evidence: C) 3. Ablation is indicated as adjunctive therapy in patients with an Implantable cardioverter-defibrillator(ICD) who are receiving multiple shocks as a result of Sustained VT that is not manageable by reprogramming or changing drug therapy or who do not wish long-term drug therapy. (Level of Evidence: C)[2][3] 4. Ablation is indicated in patients with WPW syndrome resuscitated from sudden cardiac arrest due to AF and rapid conduction over the accessory pathway causing VF. (Level of Evidence: B))[4] Class IIa1. Ablation can be useful therapy in patients who are otherwise at low risk for SCD and have symptomatic nonsustained monomorphic VT that is drug resistant, who are drug intolerant or who do not wish long-term drug therapy.(Level of Evidence: C) 2. Ablation can be useful therapy in patients who are otherwise at low risk for SCD and have frequent symptomatic predominantly monomorphic PVCs that are drug resistant or who are drug intolerant or who do not wish long-term drug therapy.(Level of Evidence: C) 3. Ablation can be useful in symptomatic patients with WPW syndrome who have accessory pathways with refractory periods less than 240 ms in duration. (Level of Evidence: B)[4] Class IIb1. Ablation of Purkinje fiber potentials may be considered in patients with ventricular arrhythmia storm consistently provoked by PVCs of similar morphology. (Level of Evidence: C)[5] 2. Ablation of asymptomatic PVCs may be considered when the PVCs are very frequent to avoid or treat tachycardia-induced cardiomyopathy. (Level of Evidence: C)[6] Class IIIAblation of asymptomatic relatively infrequent PVCs is not indicated. (Level of Evidence: C) |
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Recommendations for Acute Management Of Ventricular Tachycardia
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2005 Guidelines[1]Class I1. After establishing the presence of definite, suspected, or impending cardiac arrest, the first priority should be activation of a response team capable of identifying the specific mechanism and carrying out prompt intervention. (Level of Evidence: B) 2. Cardiopulmonary resuscitation (CPR) should be implemented immediately after contacting a response team. (Level of Evidence: A) 3. In an out-of-hospital setting, if an AED is available, it should be applied immediately and shock therapy administered according to the algorithms contained in the documents on CPR[7][8] developed by the AHA in association with the International Liaison Committee on Resuscitation (ILCOR) and/or the European Resuscitation Council (ERC). (Level of Evidence: C) 4. For victims with ventricular tachyarrhythmic mechanisms of cardiac arrest, when recurrences occur after a maximally defibrillating shock (generally 360 J for monophasic defibrillators), intravenous amiodarone should be the preferred antiarrhythmic drug for attempting a stable rhythm after further defibrillations. (Level of Evidence: B) 5. For recurrent ventricular tachyarrhythmias or nontachyarrhythmic mechanisms of cardiac arrest, it is recommended to follow the algorithms contained in the documents on CPR[7][8] developed by the AHA in association with ILCOR and/or the ERC. (Level of Evidence: C) 6. Reversible causes and factors contributing to cardiac arrest should be managed during advanced life support, including management of hypoxia, electrolyte disturbances, mechanical factors, and volume depletion. (Level of Evidence: C) Class IIaFor response times greater than or equal to 5 min, a brief (less than 90 to 180 s) period of CPR is reasonable prior to attempting defibrillation. (Level of Evidence: B) Class IIbA single precordial thump may be considered by health care professional providers when responding to a witnessed cardiac arrest. (Level of Evidence: C) 2010 Guidelines(from the section on cardioversion and wide complex tachycardia only - incomplete and will be made better once the new guidelines after 2006 are released)[9]Class IIa1.Cardioversion with monophasic waveforms should begin at 200 J and increase in stepwise fashion if not successful. (Level of Evidence: B) 2.If the etiology of the rhythm cannot be determined, the rate is regular, and the QRS is monomorphic, recent evidence suggests that IV adenosine is relatively safe for both treatment and diagnosis.[10] (Level of Evidence: B) 3.If IV antiarrhythmics are administered, procainamide can be considered. (Level of Evidence: B) 4.If antiarrhythmic therapy is unsuccessful, cardioversion or expert consultation should be considered. (Level of Evidence: C) Class IIb1.Monomorphic VT with a pulse responds well to monophasic or biphasic waveform cardioversion(synchronized) shocks at initial energies of 100 J. If there is no response to the first shock, it may be reasonable to increase the dose in a stepwise fashion. (Level of Evidence: C) 2.Precordial thump may be considered for patients with witnessed, monitored, unstable ventricular tachycardia if a defibrillator is not immediately ready for use. (Level of Evidence: C) 3.If IV antiarrhythmics are administered, amiodarone or sotalol can be considered. (Level of Evidence: B) Class III1.Adenosine should not be given for unstable or for irregular or polymorphic ventricular tachycardias, as it may cause degeneration of the arrhythmia to VF. (Level of Evidence: C) 2.Verapamil is contraindicated for wide-complex tachycardias unless known to be of supraventricular origin. (Level of Evidence: B) 3.If one of these antiarrhythmic agents is given, a second agent should not be given without expert consultation. (Level of Evidence: B) |
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References
- ↑ 1.0 1.1 Zipes DP, Camm AJ, Borggrefe M, Buxton AE, Chaitman B, Fromer M; et al. (2006). "ACC/AHA/ESC 2006 Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death: a report of the American College of Cardiology/American Heart Association Task Force and the European Society of Cardiology Committee for Practice Guidelines (writing committee to develop Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death): developed in collaboration with the European Heart Rhythm Association and the Heart Rhythm Society". Circulation. 114 (10): e385–484. doi:10.1161/CIRCULATIONAHA.106.178233. PMID 16935995.
- ↑ Bhandari AK, Shapiro WA, Morady F, Shen EN, Mason J, Scheinman MM (1985). "Electrophysiologic testing in patients with the long QT syndrome". Circulation. 71 (1): 63–71. PMID 2856866.
- ↑ Silva RM, Mont L, Nava S, Rojel U, Matas M, Brugada J (2004). "Radiofrequency catheter ablation for arrhythmic storm in patients with an implantable cardioverter defibrillator". Pacing Clin Electrophysiol. 27 (7): 971–5. doi:10.1111/j.1540-8159.2004.00567.x. PMID 15271018.
- ↑ 4.0 4.1 Pappone C, Santinelli V, Manguso F, Augello G, Santinelli O, Vicedomini G; et al. (2003). "A randomized study of prophylactic catheter ablation in asymptomatic patients with the Wolff-Parkinson-White syndrome". N Engl J Med. 349 (19): 1803–11. doi:10.1056/NEJMoa035345. PMID 14602878.
- ↑ Haïssaguerre M, Shoda M, Jaïs P, Nogami A, Shah DC, Kautzner J; et al. (2002). "Mapping and ablation of idiopathic ventricular fibrillation". Circulation. 106 (8): 962–7. PMID 12186801.
- ↑ Takemoto M, Yoshimura H, Ohba Y, Matsumoto Y, Yamamoto U, Mohri M; et al. (2005). "Radiofrequency catheter ablation of premature ventricular complexes from right ventricular outflow tract improves left ventricular dilation and clinical status in patients without structural heart disease". J Am Coll Cardiol. 45 (8): 1259–65. doi:10.1016/j.jacc.2004.12.073. PMID 15837259.
- ↑ 7.0 7.1 ECC Committee, Subcommittees and Task Forces of the American Heart Association (2005). "2005 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care". Circulation. 112 (24 Suppl): IV1–203. doi:10.1161/CIRCULATIONAHA.105.166550. PMID 16314375.
- ↑ 8.0 8.1 Nolan JP, Deakin CD, Soar J, Böttiger BW, Smith G, European Resuscitation Council (2005). "European Resuscitation Council guidelines for resuscitation 2005. Section 4. Adult advanced life support". Resuscitation. 67 Suppl 1: S39–86. doi:10.1016/j.resuscitation.2005.10.009. PMID 16321716.
- ↑ Neumar RW, Otto CW, Link MS, Kronick SL, Shuster M, Callaway CW; et al. (2010). "Part 8: adult advanced cardiovascular life support: 2010 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care". Circulation. 122 (18 Suppl 3): S729–67. doi:10.1161/CIRCULATIONAHA.110.970988. PMID 20956224.
- ↑ Staudinger T, Brugger S, Röggla M, Rintelen C, Atherton GL, Johnson JC; et al. (1994). "[Comparison of the Combitube with the endotracheal tube in cardiopulmonary resuscitation in the prehospital phase]". Wien Klin Wochenschr. 106 (13): 412–5. PMID 8091765.