![]() ![]() ![]() During exercise, many affected individuals experience chest pain, difficulty breathing, or excessive tiredness (fatigue). Symptoms related to abnormal heartbeats can include dizziness, light-headedness, fainting (syncope), a sensation of fluttering or pounding in the chest (palpitations), and confusion or memory problems. In people with sick sinus syndrome, the SA node does not function normally, which usually causes the heartbeat to be too slow (bradycardia), although occasionally the heartbeat is too fast (tachycardia) or rapidly switches from being too fast to being too slow (tachycardia-bradycardia syndrome). These signals travel from the SA node to the rest of the heart, signaling the heart (cardiac) muscle to contract and pump blood. The SA node generates electrical impulses that start each heartbeat. Sick sinus syndrome (also known as sinus node dysfunction) is an abnormality of the sinoatrial (SA) node, which is an area of specialized cells in the heart that functions as a natural pacemaker. The heart and digestive issues develop at the same time, usually by age 20. The disorder also impairs the rhythmic muscle contractions that propel food through the intestines (peristalsis), causing a digestive condition called intestinal pseudo-obstruction. CAID disrupts the normal rhythm of the heartbeat affected individuals have a heart rhythm abnormality called sick sinus syndrome. In some cases, a person has rapid gastric emptying and dumping syndrome but the cause is unknown.Chronic atrial and intestinal dysrhythmia (CAID) is a disorder affecting the heart and the digestive system.
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