This is certainly polymorphic atrial tachycardia. It occurs in respiratory disease and demonstrates an aberrant foci of atrial excitation. The morphology on the p-waves is thus variable but all p-waves are transmitted via the bundle of His and so the QRS complexes are all a similar. This EKG practice test https://physicaltherapypracticete44973.eqnextwiki.com/2983709/physical_therapy_practice_test_for_dummies