Tehran University of Medical Sciences Frontiers in Emergency Medicine 2717-3593 6 2 2022 02 10 e29 e29 Jerry W. Jones Chief Instructor, Medicus of Houston, Texas, USA 2022 02 10 2022 02 10 This is the second installment in the electrocardiogram (ECG) interpretation series by Jerry W. Jones MD FACEP FAAEM for this journal. In the previous installment, he discussed simple atrioventricular (AV) dissociation versus AV dissociation caused by third degree AV block; in this issue, he also shares some very important pearls regarding ECG interpretation. https://fem.tums.ac.ir/index.php/fem/article/view/959 https://fem.tums.ac.ir/index.php/fem/article/download/959/389