A young, healthy adult presents with atrial tachycardia that has an abrupt onset and termination. Her atrial rate is approximately 140 to 250 BPM. She feels an uneasy sensation in her chest, anxiety, and dizziness. For the next ten minutes it feels like her heart is racing and skipping beats. She has no other symptoms. Following one episode that lasted for several hours she is seen at the ER. What is her diagnosis?
A. A fib B. Heart block C. PSVT D. Angina E. Torsades