Atrial tachycardia and other ectopic atrial rhythms occur when a site outside of the sinus node, but within the atria, creates action potentials faster than the sinus node. This ectopic focus ...

There appear to be P waves present before the QRS complexes, however not of normal sinus morphology suggesting an ectopic atrial focus and thus atrial tachycardia. The below image was taken from ...