The loss of the atrial kick
is particularly detrimental in patients with diastolic dysfunction, such as left ventricular hypertrophy of any cause.
This is often referred to as "atrial kick
," which is lost in afib, when the atria simply quiver and do not help the blood pump forward.
So, the passive filling and atrial kick
occur simultaneously, resulting in shortened LV filling time and decreased preloading of LV.
Some children tolerate atrial fibrillation for months at a time with no hemodynamic changes, while others may require the atrial kick
to sustain their cardiac output.