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.
While not likely to be sudden and bilateral--this is potentially life threatening. Essentially a DVT is a blood clot that spontaneously forms in the venous system (the vessels that bring blood from the muscles back to the heart). These clots can form from multiple conditions--the two most common are a thrombophilia (or blood clotting disorder) or an undiagnosed cancer.