From your 2021 MCME Online module on Bundle Branch Blocks:

A question came up regarding what is RSR.

RSR is a “QRS” complex with an R-wave (upward deflection), followed by an S-wave (downward deflection), followed by another R-wave (upward deflection).  This pattern is seen in lead V1 in Right Bundle Branch Blocks.

Check out the 2021 MCME Precourse on Bundle Branch Block for a deeper dive on this ECG finding.

Lead V1 with RsR pattern

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