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Atrial flutter is a condition characterized by rapid and irregular atrial contractions, which can significantly affect the heart's ability to pump blood effectively. This inefficiency in blood flow can lead to blood pooling in the atria, particularly in the left atrial appendage, where thrombus (blood clots) can form. If these clots break free, they can travel to the brain, resulting in a stroke.

In contrast, while heart murmurs might indicate underlying conditions that could affect blood flow, they do not directly cause the same level of inefficiency or the increased risk of stroke associated with atrial flutter. Bradycardia, which refers to a slower-than-normal heart rate, can sometimes lead to inadequate circulation but is generally less likely to result in the pooling of blood that atrial flutter does. Stable angina, a type of chest pain due to reduced blood flow to the heart muscle, also does not directly correlate with an increased risk of stroke related to blood flow inefficiencies in the same manner as atrial flutter. Therefore, atrial flutter stands out as the condition that most directly leads to a rise in stroke risk due to its impact on blood flow dynamics.