Final answer:
The left atrial appendage is the most common site of intracardiac thrombus formation in atrial fibrillation due to stagnation of blood when the left atrium is not contracting effectively.The correct answer is options 1
Step-by-step explanation:
The most common anatomic site of intracardiac thrombus formation in atrial fibrillation is the left atrial appendage (LAA). The LAA is a small, ear-shaped sac in the muscle wall of the left atrium, which is one of the four chambers of the heart.
In patients with atrial fibrillation, the left atrium may not contract effectively, leading to stasis of blood within the LAA and subsequently increasing the risk of thrombus formation. So, The correct answer is options 1