This is called "AV dissociation" and occurs in complete heart block (a.k.a. 3rd degree heart block). In this situation, the P waves have their own rate (tachycardic here) and the QRS complex have ...

According to doctors, Mikey Oliveri was born prematurely and weighed just 2.5 kg and had his life saved by this tiny device after he was diagnosed with heart block, a dangerous condition.