The characteristic wave patterns of a typical left bundle branch block as seen in an ECG. Wide QRS complexes are present and there's T wave inversion in lead V6 which is normal in this condition. Below each QRS complex is its designation (<i>rS</i> and <i>R</i>) according to nomenclature.
<div style="display:inline-block;padding:0 3px;background-color:#BDC"><a href="//commons.wikimedia.org/wiki/File:Left_bundle_branch_block_ECG_characteristics.png" title="File:Left bundle branch block ECG characteristics.png"><b>Original: </b></a></div> <div style="display:inline-block;padding:3px 0;"><a href="//commons.wikimedia.org/w/index.php?title=User:A._Rad&amp;action=edit&amp;redlink=1" class="new" title="User:A. Rad (page does not exist)">A._Rad</a></div> <div style="display:inline-block;padding:0 3px;background-color:#CCF">Vector: </div> <div style="display:inline-block;"><a href="//commons.wikimedia.org/wiki/User:Mrmw" title="User:Mrmw">Mrmw</a></div>
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Left_bundle_branch_block_ECG_characteristics.png" title="File:Left bundle branch block ECG characteristics.png">Left bundle branch block ECG characteristics.png</a>: <a href="//commons.wikimedia.org/wiki/File:Left_bundle_branch_block_ECG_characteristics.png" class="image"><img alt="Left bundle branch block ECG characteristics.png" src="https://upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Left_bundle_branch_block_ECG_characteristics.png/132px-Left_bundle_branch_block_ECG_characteristics.png" decoding="async" width="132" height="121" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Left_bundle_branch_block_ECG_characteristics.png/198px-Left_bundle_branch_block_ECG_characteristics.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/a/aa/Left_bundle_branch_block_ECG_characteristics.png 2x" data-file-width="208" data-file-height="191"></a>