Table 1.

Differential Diagnosis for R' ECG Pattern in Leads V₁‐V₂

A. Benign patterns:
1. Higher placement of electrodes V1–V2
2. Normal variant: The r' is usually of peripheral origin
3. Partial RBBB: The r' is usually of proximal origin
4. Athletes
5. Pectus excavatum
B. Pathological patterns:
1. Type‐2 Brugada pattern
2. RV Enlargement that encompasses cases of RV hypertrophy and or dilation often accompanied of peripheral RV delay. These include valvular and congenital heart diseases affecting the RV, pulmonary hypertension, Ebstein disease, arrhythmogenic right ventricular dysplasia (ARVD), etc.
3. Some cases of Ventricular preexcitation (Wolf‐Parkinson‐White)
4. Hyperkalemia