where do blood clots usually form in the heart with tachycardia
Tachycardias also can cause serious injury to other organs. For example, the brain, kidneys, lungs or liver may be damaged during prolonged cardiac arrest. Blood clots can form in the heart's upper chambers because of atrial fibrillation, a disorder in which the atria quiver instead of beating effectively. Blood that isn't pumped completely out of the atria when the heart beats may pool and clot.