As a medical professional with expertise in cardiology, I can provide you with an accurate description of Bradycardia-Tachycardia Syndrome. Bradycardia-Tachycardia Syndrome, also known as Sick Sinus Syndrome (SSS), is a condition where the heart's natural pacemaker, located in the upper chambers (atria) of the heart, does not function properly. This can lead to a combination of bradycardia (abnormally slow heart rate) and tachycardia (abnormally fast heart rate). The syndrome is characterized by episodes of both slow and fast heart rhythms, which can be life-threatening in some cases. In SSS, the heart's pacemaker may not send the electrical signals necessary to maintain a normal heart rate, or it may send signals too slowly or too quickly. This can result in symptoms such as fatigue, shortness of breath, dizziness, and fainting. The exact cause of SSS is not always known, but it can be associated with aging, heart surgery, or certain medical conditions like coronary artery disease, or it may be congenital. Treatment for SSS typically involves pacemaker implantation, which is a small device that helps regulate the heartbeat. In some cases, medications may also be used to control the heart rate. read more >>

The heartbeat rate is too slow, called sinus bradycardia. The heartbeat pauses or stops, called sinus pauses or sinus arrest. Episodes of a fast heart rate. Slow heart rhythms that alternate with fast heart rhythms, called bradycardia-tachycardia or "tachy-brady syndrome"read more >>