Paroxysmal atrial tachycardia is described as sudden onset and ending of atrial tachycardia at 150-250 bpm.

• A. PAT
• B. NSR
• C. P Wave
• D. QRS

Answer: (A)

Paroxysmal atrial tachycardia is defined by a sudden onset and offset of an atrial tachycardia at a rapid rate, typically 150–250 breaths per minute. That abrupt start and stop with a fast rhythm directly matches the description, so the term is the best label for this pattern. Normal sinus rhythm wouldn’t show a sudden, rapid onset tachycardia; P waves are the atrial depolarization waves and QRS complexes are the ventricular depolarization patterns, but they aren’t the rhythm name itself.