A patient presents with recent onset of breathlessness. An ECG is taken (shown below). What is the diagnosis?

Ans. D. Multifocal Atrial Tachycardia (MAT)* ECG shows narrow complex tachycardia with irregular rhythm.* Since P waves are seen it rules out AF.* Different morphologies of P waves (>3) in lead II rules out sinus arrhythmia.* All the above said features confirm MAT.* Also, absence of chest pain and significant ST elevations rules out AMI.Multifocal atrial tachycardia (MAT)ECG findings:* Heart rate typically between 100and150bpm.* Irregularly irregular rhythm with varying FP,PR, and RR intervals.* At least 3 distinct P-wave morphologies in the same lead.Distinct P-wave morphologies* Isoelectric baseline between P waves (i.e., no flutter waves).