knee-jerk reaction. Fig. an automatic or reflex reaction; an immediate reaction made without examining causes or facts. With one of his typical knee-jerk reactions, he said no immediately, citing some moral argument that no one understood. See also: reaction.
What did you see when the patients head was rolled to the opposite side? In horizontal canal BPPV, you should have seen a direction change. When the horizontal nystagmus is geotropic, the BPPV is suspected to be canalithiasis, occurring on the side with the more intense nystagmus.
Like any graph,an oscilloscope image shows two values:â¢ON THE HORIZONTAL AXIS-The scope shows the passage oftime along the horizontal axis (moving from left to right). The unitsof time are set by a control on the oscilloscope.â¢ON THE VERTICAL AXIS-The image on the scope display showsvoltage along the vertical axis.