The Early Signs of Right Bundle Branch Block

Differential Diagnosis of rSr’ Pattern in Leads V1-V2. Comprehensive Review and Proposed Algorithm

“…Similarly to the normal variant, in partial RBBB the r’ is of fast inscription, the ST‐segment presents a descending slope without ST‐segment ascent and there is not mismatch between the right and left precordial leads duration. Some electrocardiographic features to differentiate partial RBBB from a normal ECG variant have been described . These may predict progression to advanced RBBB and include: (1) progressive decrease of the S‐wave voltage; (2) slurring of the ascending slope of the S wave (Fig.…”

Electrocardiographic Findings in Accessory Right Precordial Leads in Adults and Seniors with Notched S Waves in Lead V1—A Preliminary Study

“…According to Schamroth et al., a diminution of the S‐wave amplitude in lead V 2 reflects the early development of RBBB. Further progression leads to slurring or notching of the upstroke of the S wave in lead V 2 , followed by the development of an R′ deflection.…”

“…Right bundle branch block (RBBB) may present an rS pattern with notched S wave in lead V 1 (atypical RBBB) . However, RBBB is often seen in patients with acute coronary syndrome (ACS) and as a transient phenomenon in acute pulmonary embolism (APE) .…”

Electrocardiographic right ventricular strain precedes hypoxic pulseless electrical activity cardiac arrests: Looking beyond pulmonary embolism

“…In normal ventricular depolarization, the left and right ventricles depolarise nearly simultaneously. 15 As RV pressures elevate acutely, there is progressive RV dilation and transmural ischaemia, manifesting as a rightward ST segment elevation vector. Shortly thereafter or simultaneously, RV depolarization gradually delays due to ischaemia of the right bundle.…”