Brugada syndrome: Difference between revisions
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*Type 2-Elevated ST segment (>1mm) descends toward baseline then rises again (saddleback) to upright T wave | *Type 2-Elevated ST segment (>1mm) descends toward baseline then rises again (saddleback) to upright T wave | ||
*Type 3-Elevated ST segment (<1mm) descends toward baseline then rises again to upright T wave | *Type 3-Elevated ST segment (<1mm) descends toward baseline then rises again to upright T wave | ||
====EKG monitoring==== | |||
*V1-v2 lead placement in 2nd or 3rd IC spaces (rather than conventional 4th IC space) increases chance of recording type I pattern<ref>Shimizu W., Matsuo K., Takagi M.; Body surface distribution and response to drugs of ST segment elevation in Brugada syndrome: clinical implication of eighty-seven-lead body surface potential mapping and its application to twelve-lead electrocardiograms. J Cardiovasc Electrophysiol. 11 2000:396-404.</ref> | |||
*Other factors that increase type I EKG tracings<ref>Ikeda T., Abe A., Yusu S.; The full stomach test as a novel diagnostic technique for identifying patients at risk of Brugada syndrome. J Cardiovasc Electrophysiol. 17 2006:602-607.</ref><ref>Shimeno K., Takagi M., Maeda K., Tatsumi H., Doi A., Yoshiyama M.; Usefulness of multichannel Holter ECG recording in the third intercostal space for detecting type 1 Brugada ECG: comparison with repeated 12-lead ECGs. J Cardiovasc Electrophysiol. 20 2009:1026-1031.</ref><ref>Keller D.I., Huang H., Zhao J.; A novel SCN5A mutation, F1344S, identified in a patient with Brugada syndrome and fever-induced ventricular fibrillation. Cardiovasc Res. 70 2006:521-529.</ref>: | |||
**Fever | |||
**Night time | |||
**After heavy meals | |||
[[File:Brugada.jpg]] | [[File:Brugada.jpg]] | ||
Revision as of 19:50, 5 August 2016
Background
- Consider as cause of syncope in patients with family history of sudden death
- 80% of Brugada syndrome diagnosed only after a cardiac arrest[1]
- Autosomal dominant Na-channelopathy which increases the risk of sudden cardiac death (~10%/yr)[2]
- Much more common in men (up to 9x), particularly Southeast Asian males
- ECG shows incomplete RBBB with ST elevation in V1-V3
- In uncomplicated RBBB, usually there no ST change to slight ST depression
- If presenting symptom is chest pain rather than syncope, consider strongly STEMI
Clinical Features
- Typically asymptomatic
- ECG findings can be more prominent during times of illness or fever
- Patients may have Vfib arrest or sudden death
- Diagnostic EKG findings transient and variable, with only 1/3 of serial EKGs diagnostic in confirmed spontaneous coved-type Brugada syndrome pts[3]
Differential Diagnosis
ST Elevation
- Cardiac
- ST-segment elevation myocardial infarction (STEMI)
- Post-MI (ventricular aneurysm pattern)
- Previous MI with recurrent ischemia in same area
- Wellens' syndrome
- Coronary artery vasospasm (eg, Prinzmetal's angina)
- Coronary artery dissection
- Pericarditis
- Myocarditis
- Aortic dissection in to coronary
- Left ventricular aneurysm
- Left ventricular pseudoaneurysm
- Early repolarization
- Left bundle branch block
- Left ventricular hypertrophy (LVH)
- Myocardial tumor
- Myocardial trauma
- RV pacing (appears as Left bundle branch block)
- Brugada syndrome
- Takotsubo cardiomyopathy
- AVR ST elevation
- Other thoracic
- Metabolic
- Drugs of abuse (eg, cocaine, crack, meth)
- Hyperkalemia (only leads V1 and V2)
- Hypothermia ("Osborn J waves")
- Medications
Evaluation
ECG Criteria
Note - ECG findings can be transient
- Type 1-Elevated ST segment (>2mm) descends with upward convexity to a TWI
- Type 2-Elevated ST segment (>1mm) descends toward baseline then rises again (saddleback) to upright T wave
- Type 3-Elevated ST segment (<1mm) descends toward baseline then rises again to upright T wave
EKG monitoring
- V1-v2 lead placement in 2nd or 3rd IC spaces (rather than conventional 4th IC space) increases chance of recording type I pattern[4]
- Other factors that increase type I EKG tracings[5][6][7]:
- Fever
- Night time
- After heavy meals
Management
- Cardiology consultation
Disposition
- Needs EP consult and VF-inducing electrophysiologic study (EPS), though EPS is controversial prognosticator[8]
- Inpatient vs outpatient ICD placement
- Prophylactic ICDs may have risks of complications greater than benefits conferred[9][10]
- Mortality around 10% per year without ICD placement[citation needed]
- Antidysrhythmics have no effect on prognosis
External Links
See Also
References
- ↑ Paul M., Gerss J., Schulze-Bahr E.; Role of programmed ventricular stimulation in patients with Brugada syndrome: a meta-analysis of worldwide published data. Eur Heart J. 28 2007:2126-2133.
- ↑ Cerrato N, Giustetto C, et al. Prevalence of Type 1 Brugada Electrocardiographic Pattern Evaluated by Twelve-Lead Twenty-Four-Hour Holter Monitoring. The American Journal of Cardiology.115(1). 2015. 52-56.
- ↑ Richter S., Sarkozy A., Veltmann C.; Variability of the diagnostic ECG pattern in an ICD patient population with Brugada syndrome. J Cardiovasc Electrophysiol. 20 2009:69-75.
- ↑ Shimizu W., Matsuo K., Takagi M.; Body surface distribution and response to drugs of ST segment elevation in Brugada syndrome: clinical implication of eighty-seven-lead body surface potential mapping and its application to twelve-lead electrocardiograms. J Cardiovasc Electrophysiol. 11 2000:396-404.
- ↑ Ikeda T., Abe A., Yusu S.; The full stomach test as a novel diagnostic technique for identifying patients at risk of Brugada syndrome. J Cardiovasc Electrophysiol. 17 2006:602-607.
- ↑ Shimeno K., Takagi M., Maeda K., Tatsumi H., Doi A., Yoshiyama M.; Usefulness of multichannel Holter ECG recording in the third intercostal space for detecting type 1 Brugada ECG: comparison with repeated 12-lead ECGs. J Cardiovasc Electrophysiol. 20 2009:1026-1031.
- ↑ Keller D.I., Huang H., Zhao J.; A novel SCN5A mutation, F1344S, identified in a patient with Brugada syndrome and fever-induced ventricular fibrillation. Cardiovasc Res. 70 2006:521-529.
- ↑ Viskin S and Rosso R. Risk of Sudden Death in Asymptomatic Brugada Syndrome: Not as High as We Thought and Not as Low as We Wished…But the Contrary. J Am Coll Cardiol. 2010;56(19):1585-1588.
- ↑ Sacher F., Probst V., Iesaka Y.; Outcome after implantation of a cardioverter-defibrillator in patients with Brugada syndrome: a multicenter study. Circulation. 114 2006:2317-2324.
- ↑ Rosso R., Glick A., Glikson M.; Outcome after implantation of cardioverter defibrillator in patients with Brugada syndrome: a multicenter Israeli study (ISRABRU). Isr Med Assoc J. 10 2008:435-439.