These tests often involve walking on a treadmill or pedaling a stationary bike while the heart is monitored. This test can show how blood flows through the heart and heart valves. Sound waves are used to create images of the beating heart. For example, you may need one if you've had an unexplained stroke. Sometimes it's used to find rare episodes of AFib in those at high risk of the heart problem. It may be used to see how often you have an AFib episode. The device shows how the heart is beating while you do your daily activities. It's also called a cardiac event recorder. This device records the heartbeat continuously for up to three years. Some devices automatically record when an irregular heart rhythm is detected. You usually push a button when you feel symptoms. This device is like a Holter monitor, but it records only at certain times for a few minutes at a time. It's worn for a day or two while you do your regular activities. This small, portable ECG device records the heart's activity. It's the main test for diagnosing atrial fibrillation. An ECG can show the heart rhythm and how slow or fast the heart is beating. Wires connect the electrodes to a computer, which prints or displays the test results. Sticky patches called electrodes are placed on the chest and sometimes the arms and legs. This quick and painless test measures the electrical activity of the heart. Blood tests are done to look for health conditions or substances that may affect the heart or heartbeat. Tests to diagnose atrial fibrillation (AFib) may include:
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