The common cold is generally mild and self-limiting with most symptoms generally improving in a week. Half of cases go away in 10 days and 90% in 15 days. Severe complications, if they occur, are usually in the very old, the very young, or those who are immunosuppressed.
Types of sick sinus syndrome and their causes include: 1  Sinoatrial block. Electrical signals move too slowly through the sinus node, causing an abnormally slow heart rate. 2  Sinus arrest. The sinus node activity pauses.  Bradycardia-tachycardia syndrome.
A cardiac arrest occurs when your heart suddenly stops beating. The heart functions through electrical pulses, and when those pulses are interrupted it can cause an irregular heartbeat or cardiac arrest. The cause of cardiac arrest is an electrical problem. It does not have anything to do with your arteriesâ functions. cardiac arrest occurs when your heart suddenly stops beating. The heart functions through electrical pulses, and when those pulses are interrupted it can cause an irregular heartbeat or cardiac arrest. The cause of cardiac arrest is an electrical problem. It does not have anything to do with your arteriesâ functions.