Brugada syndrome treatment: Difference between revisions
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*Patients with no family history of [[sudden cardiac death]] in whom VT VF can be induced on electrophysiologic testing. | *Patients with no family history of [[sudden cardiac death]] in whom VT VF can be induced on electrophysiologic testing. | ||
In essence, if VT VF can be induced on electrophysiologic testing in these patients, a cardiac defibrillator should be implanted. | In essence, if VT VF can be induced on electrophysiologic testing in these patients, a cardiac defibrillator should be implanted. It is unclear if the same recommendations apply to those patients who require that the electrodes be placed one to two intercostal spaces higher to demonstrate a Brugada type I electrocardiographic pattern. | ||
The flowchart below summarizes the recommendations of the 2005 consensus panel. | The flowchart below summarizes the recommendations of the 2005 consensus panel. | ||
Revision as of 23:05, 14 October 2012
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Implantation of a cardiac defibrillator is the only proven method of treatment in Brugada syndrome. Patients with aborted sudden cardiac death are at high risk for recurrence and should undergo AICD implantation, and do not require an electrophysiologic study to assess inducibility. The 2005 consensus statement divides patients into two groups:
- Higher risk patients with spontaneous Type I Brugada pattern
- A less high risk cohort of patients who require infusion of a sodium channel blocker to induce a Type I Brugada pattern.
The management of these two groups of patients will be discussed separately.
Management of Patients with a Spontaneous Type I Brugada Pattern
Implantation of a cardiac defibrillator should be considered in the following patients:
Symptomatic Patients
- Patients with aborted sudden cardiac death
- Patients with syncope, seizures or nocturnal agonal respirations who have no other identifiable cause for their symptoms
Asymptomatic Patients
- Patients with a family history of sudden cardiac death that is suspected to be due to Brugada syndrome in whom VT VF can be induced on electrophysiologic testing.
- Patients with no family history of sudden cardiac death in whom VT VF can be induced on electrophysiologic testing.
In essence, if VT VF can be induced on electrophysiologic testing in these patients, a cardiac defibrillator should be implanted. It is unclear if the same recommendations apply to those patients who require that the electrodes be placed one to two intercostal spaces higher to demonstrate a Brugada type I electrocardiographic pattern.
The flowchart below summarizes the recommendations of the 2005 consensus panel.
Management of Patients with a Sodium Channel Induced Type I Brugada Pattern
Implantation of a cardiac defibrillator should be considered in the following patients:
Symptomatic Patients
- Patients with aborted sudden cardiac death
- Patients with syncope, seizures or nocturnal agonal respirations who have no other identifiable cause for their symptoms
Asymptomatic Patients
- Patients with a family history of sudden cardiac death that is suspected to be due to Brugada syndrome in whom VT VF can be induced on electrophysiologic testing.
The flowchart below summarizes the recommendations of the 2005 consensus panel.
Some recently performed studies had evaluated the role of quinidine, a Class Ia antiarrythmic drug, for decreasing VF episodes occurring in this syndrome. Quinidine was found to decrease number of VF episodes and correcting spontaneous ECG changes, possibly via inhibiting Ito channels.[1] Those with risk factors for coronary artery disease may require an angiogram before ICD implantation.
Patients who are symptomatic with unexplained [[syncope], ventricular tachycardia or aborted sudden cardiac death may have a symptom recurrence risk of 2% to 10% per year. In these patients an AICD implant is advisable.
- VT storm has been successfully treated with Isoproterenol. The mechanism is thought to be augmenting the cardiac L type channel.
- Asymptomatic patients require risk stratification and clinical judegement to help guide therapy
- Quinidine (class IA sodium channel blocker) blocks the Ito current and is proven to suppress spontaneous VF
- Cilostazol (phosphodiesterase III inhibitor that increases inward L type calcium channel current and reported to suppress spontaneous VF
- Bepridil suppress spontaneous VF probably through blocking Ito current
- Medical therapy alone with the above agents is currently not evaluated in randomized trials and should not be used as loan therapy.
Drugs with Potential Antiarrhythmic Effect
(Alphabetical order generic name)
| Generic name | Brand name® | Class / Clinical use | References | Recommendation |
| Cilostazol | e.g. Pletal® |
Phosphodiesterase inhibitor | Tsuchiya 2002 Abud 2006 Matsui 1999 |
Class IIb |
| Isoproterenol Isoprenaline |
e.g. Isuprel® |
Beta-adrenergic receptor stimulation | Miyazaki 1996 Suzuki 2000 Watanabe 2006 Ohgo 2007 Ganesan 2006 |
Class I |
| Orciprenaline | e.g. Alotec® Metaprel® Novasmasol® |
Beta-adrenergic receptor stimulation | Kyriazis 2009 | Class IIa |
| Quinidine | e.g. Quinalan® Chinidin® |
Antiarrhythmic Agent | Suzuki 2000 Alings 2001 Belhassen 2004 Mizusawa 2006 Probst 2007 Ohgo 2007 Yan 1999 |
Class I |
Recommendation: Class I: convincing evidence/opinion; Class IIa: evidence/opinion less clear; Class IIb: conflicting evidence/opinion; Class III: very little evidence.
ACC/AHA/ESC 2006 Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death (DO NOT EDIT) [2]
Recommendations for Brugada Syndrome
| Class I |
| "1. An ICD is indicated for Brugada syndrome patients with previous cardiac arrest receiving chronic optimal medical therapy and who have reasonable expectation of survival with a good functional status for more than 1 y. (Level of Evidence: C)" |
| Class IIa |
| "1. An ICD is reasonable for Brugada syndrome patients with spontaneous ST-segment elevation in V1, V2, or V3 who have had syncope with or without mutations demonstrated in the SCN5A gene and who have reasonable expectation of survival with a good functional status for more than 1 y. (Level of Evidence: C)" |
| "2. Clinical monitoring for the development of a spontaneous ST-segment elevation pattern is reasonable for the management of patients with ST-segment elevation induced only with provocative pharmacological challenge with or without symptoms. (Level of Evidence: C)" |
| "3. An ICD is reasonable for Brugada syndrome patients with documented VT that has not resulted in cardiac arrest and who have reasonable expectation of survival with a good functional status for more than 1 y. (Level of Evidence: C)" |
| "4. Isoproterenol can be useful to treat an electrical storm in the Brugada syndrome. (Level of Evidence: C)" |
| Class IIb |
| "1. EP testing may be considered for risk stratification in asymptomatic Brugada syndrome patients with spontaneous ST elevation with or without a mutation in the SCN5A gene. (Level of Evidence: C)" |
| "2. Quinidine might be reasonable for the treatment of electrical storm in patients with Brugada syndrome.(Level of Evidence: C)" |
References
- ↑ Belhassen B, Glick A, Viskin S (2004). "Efficacy of quinidine in high-risk patients with Brugada syndrome". Circulation. 110 (13): 1731–7. doi:10.1161/01.CIR.0000143159.30585.90. PMID 15381640.
- ↑ 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.