Asterixis (also called the flapping tremor, or liver flap)'s a tremor of the wrist when the wrist's extended (dorsiflexion), sometimes said to resemble a bird flapping its wings. The term derives from the Greek a, "not" and stērixis, "fixed position". Associated conditions and presentation Usually there're brief, arrhythmic interruptions of sustained voluntary muscle contraction causing brief lapses of posture, with a frequency of 3-5 Hz. It's bilateral, but may be asymmetric. It can be… (More on Asterixis)