![]() Wires attach the sensors to a computer, which displays or prints results. Sensors (electrodes) are attached to the chest and legs. This simple test measures the electrical activity of the heart. To determine whether symptoms are related to problems with the sinus node and heart function, a health care provider may use the following tests: You may not have symptoms at the time of the appointment. Symptoms of sick sinus syndrome - such as dizziness, shortness of breath and fainting - only occur when the heart is beating irregularly. To diagnose sick sinus syndrome, a health care provider performs a physical exam and asks about symptoms and medical history. The heart rate alternates between unusually slow and fast rhythms, often with a long pause between heartbeats. The heart rate is within regular range at rest but doesn't increase as much as it should with physical activity. Signals to the upper heart chambers are slowed or blocked, causing pauses or skipped beats. ![]() Signals from the sinus node pause, causing skipped beats. ![]() The sinus node produces a slow heartbeat.
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