[Paroxysmal tachicardia during pregnancy, electro-cardioversion, delivery].

We present a rare case of high-stage paroxysmal atrial tachycardia, clinically exhibit during pregnancy. Refers to 29-years-old pregnant woman, without preceding heart disease. With advancement of pregnancy tachycardial bout getting up daily, its severity increased gradually. At 24 weeks gestation, close to serial ponderous crisis, heart frequency exceed 200 heart beat per minute, expressing clinical manifestation of MAS-syndrome. The bout was not influenced on applied drug therapy. Restore to normal heart rhythm is reached difficult after electro-cardioversion . Because of new extremely acceleration of heart rate and unstable hemodynamics during the supportive therapy, is undertaking second electro-cardioversion. We applied anti-recurrent drug therapy. At 36 weeks gestation, the patient manifested resistance to applied therapy, which imposed pre-term delivery by elective caesarean section in interest of the mother and fetus, by the presence of cardiologist.