Is this condition like atrial fibrillation?

Is this condition like atrial fibrillation?

Atrial tachycardia typically causes the heart's upper chambers to beat between 100 to 250 beats per minute in adults. However, this number can be higher in children and infants. While this is unusually fast, it doesn’t interfere with the heart’s normal pumping ability.

Atrial fibrillation is dangerous because it causes the heart's upper chambers to beat between 350 to 600 beats per minute. When this happens, your heart's upper chambers can't fill with blood and may not pump all of the blood already inside them, causing blood to pool. This can allow clots to form, and the clots can travel from your heart to your brain, causing a stroke.