Making a diagnosis of sick sinus syndrome is done by performing several tests. However, in some cases, the sinus node does not work properly because of age-related wear and tear of the heart muscle. Sick sinus syndrome may also be triggered by certain group of medications, such as calcium channel blockers or beta blockers that are used in the treatment of high blood pressure, heart diseases or other conditions. Scar tissue that may occur as a result of a previous heart surgery also may be the cause, especially in children. Bradycardia-tachycardia syndrome: The heart rate follows a pattern of alternating abnormally fast and slow heart rhythms, usually with a long pause (asystole) in between heartbeats.ĭiseases and conditions that cause scarring or damage to your heart's electrical system are the reason for malfunctioning of the sinus node.Sinus arrest: The sinus node stops sending electrical signals or sinus node activity pauses. ![]()
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