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People with the irregular heart rhythm called atrial fibrillation have an increased risk of blood clots, which can lead to a stroke. Most blood clots in these patients form in a small pocket of the heart, explain invasive cardiac electrophysiologist People with the irregular heart rhythm called atrial fibrillation have an increased risk of blood clots, which can lead to a stroke. Most blood clots in these patients form in a small pocket of the heart, explain invasive cardiac electrophysiologist Jamal Ahmed, MD Jamal Ahmed, MD, right, and nurse Scott Davis, left, who both work in the, right, and nurse Scott Davis, left, who both work in the Upstate Heart and Vascular Center. Upstate Heart and Vascular Center. Davis is Davis is the Watchman procedure the Watchman procedure coordinator, which refers to the procedure now offered to prevent clots from escaping that pocket, known as the left atrial appendage. coordinator, which refers to the procedure now offered to prevent clots from escaping that pocket, known as