Table 2: Commonly Associated ECG Findings and Differential Diagnoses of Brugada-like ECG Pattern.

ECG Findings Commonly Associated with Brugada Syndrome
Decrease in ST-segment elevation during tachycardia at maximal stress–exercise test and reappearance in the recovery phase
First degree AV block and left-axis deviation of the QRS
Right bundle branch block
Minor QT prolongation
Late potentials in the signal-averaged ECG
Fragmented QRS in leads V1–V3
VPBs with left bundle branch block morphology originating from the RVOT
AF
Early repolarisation in the inferior or infero-lateral leads
Deferential Diagnoses of Conditions that can Mimic the Brugada ECG Pattern
Acute conditions	Chronic conditions
Acute ischemia/infarction (particularly of the RVOT region)	Atypical right bundle branch block
Prinzmetal angina	Left ventricular hypertrophy
Myocarditis/pericarditis	Pulmonary arterial hypertension
Pulmonary embolism	Mechanical compression of the RVOT (e.g. pectus excavatum)
Dissecting aortic aneurysm	Duchenne muscular dystrophy
Electrolyte abnormalities (hyper/hypokalemia, hypercalcaemia)	Fridreich’s ataxia
Hyperthermia/hypothermia	Athlete’s heart
Post-defibrillation/post-electrocution	Chagas disease
	Arrhythmogenic cardiomyopathy

AV = atrioventricular; RVOT = right ventricular outflow tract; VPB = ventricular premature beats. Adapted from: Polovina et al. 2017.[11] Reproduced with permission from Elsevier.