Johkura K, Komiyama A, Tobita M, Hasegawa O
Department of Neurology, Urafune Hospital, Yokohama City University School of Medicine, Japan.
J Neuroophthalmol. 1998 Mar;18(1):43-6.
Ping-pong gaze (PPG), or short-cycle periodic alternating gaze, consists of horizontal conjugate ocular deviations alternating every few seconds. This alternating gaze has been described as appearing to be smooth. However, our electrooculographic study of four consecutive unconscious patients with PPG showed smooth waveforms in one patient but saccadic cog-wheeling in three patients. In one of the three patients with saccadic PPG, a transition from smooth to saccadic waveforms was noted with clinical improvement. Whereas the patient with smooth PPG died immediately, the patients with saccadic PPG survived in a persistent vegetative state. These findings suggest that saccadic PPG is a clinical variant of PPG in patients in a lighter state of consciousness, possibly related to less extensive brain damage.
乒乓样凝视（PPG），即短周期周期性交替凝视，表现为每隔几秒出现一次水平共轭性眼球偏斜。这种交替凝视被描述为看起来很平滑。然而，我们对四名连续患有PPG的昏迷患者进行的眼电图研究显示，一名患者的波形是平滑的，而三名患者的波形是眼球震颤样的齿轮状。在三名眼球震颤样PPG患者中的一名患者中，随着临床症状的改善，观察到波形从平滑转变为眼球震颤样。平滑PPG的患者立即死亡，而眼球震颤样PPG的患者以持续性植物状态存活。这些发现表明，眼球震颤样PPG是意识较轻患者中PPG的一种临床变体，可能与脑损伤范围较小有关。
