19) Male,30 years old, came to the clinic with paroxysmal palpitations for 2 days. Physical examination BP:125/70 mmHg. HR: 190 bpm, the heart rhythms and the sounds are normal. 1 minute later his...

19) Male,30 years old, came to the clinic with paroxysmal palpitations for 2 days. Physical examination BP:125/70 mmHg. HR: 190 bpm, the heart rhythms and the sounds are normal. 1 minute later his heart rate suddeniy decreased to 80 bpm with the normal heart rhythm. What is his most likely clinical diagnosis? ASinus tachycardia BParoxysmal atrial fibrillation C Paroxysmal supraventricular tachycardia DParoxysmal atrial flutter E Third degree atrioventricular block