The part of the autonomic nervous system originating in the brain stem and the lower part of the spinal cord that, in general, inhibits or opposes the physiological effects of the sympathetic nervous system, as in tending to stimulate digestive secretions, slow the heart, constrict the pupils, and dilate blood vessels.
Paroxysmal supraventricular tachycardia (PSVT) Alternative names PSVT; Supraventricular tachycardia Definition: Paroxysmal supraventricular tachycardia (PSVT) is a rapid heart rate, which occurs from time to time (paroxysmal). PSVT starts with events taking place above the ventricles.
Sounds like NSVT--non-sustatined ventricular tachycardia. I have this. What this is is a minor heart condition that causes your heart to occasionally beat very hard and fast for about 3-10 beats and then it goes back to normal.The first few times it happened it scared me.ounds like NSVT--non-sustatined ventricular tachycardia. I have this. What this is is a minor heart condition that causes your heart to occasionally beat very hard and fast for about 3-10 beats and then it goes back to normal. The first few times it happened it scared me.