有一位患动脉硬化的老人,每天早晨打太极拳锻炼身体。由于近来经常感到头晕,便晃动和摇摆颈部想使头脑清醒。结果事与愿违,头晕更加明显,甚至在活动颈部时还常常出现眼前发黑的现象。实际上,老人的这些症状是大脑供血不足所致,而活动颈部使大脑缺血更加严重,甚至影响到了眼睛的血液供应,出现眼前发黑和暂时性视力障 There is an elderly person suffering from arteriosclerosis, tai chi exercise every morning. Due to the recent dizziness, I shake and swing my neck to make my head clear. The result was contrary to expectations, dizziness even more apparent, even in the activities of the neck often appear black and white phenomenon. In fact, these symptoms of the elderly are due to insufficient blood supply to the brain, and the activity of the neck to make the brain more severe ischemia, affecting the blood supply to the eyes, the immediate black and temporary visual impairment