Which of the following will occur in a girl who suddenly stops spinning after several seconds of spinning to the left?
**Core Concept**
The question is testing the understanding of the vestibular system and its response to rotational movements, specifically the concept of nystagmus and the direction of its beat. Spinning to the left induces a vestibular-ocular reflex, causing the eyes to move in one direction and the head to move in the opposite direction, resulting in a compensatory nystagmus.
**Why the Correct Answer is Right**
When a person spins to the left, the vestibular system is stimulated, causing the eyes to move to the right (opposite direction of head movement). After stopping the spinning, the eyes continue to move to the right due to the inertia of the eye movement, while the head remains still. This results in a nystagmus, with the slow phase being to the right and the fast phase being to the left. The direction of the slow phase is away from the direction of the initial rotation, which in this case is to the left.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it describes a situation where the nystagmus is in the same direction as the initial rotation, which is not the case.
**Option B:** This option is incorrect because it describes a situation where the nystagmus is in the opposite direction of the initial rotation, but the correct answer is the opposite of this option.
**Option D:** This option is incorrect because it describes a situation where the nystagmus is not related to the direction of the initial rotation, which is not relevant in this scenario.
**Clinical Pearl / High-Yield Fact**
When a patient experiences nystagmus, it's essential to determine the direction of the slow phase to understand the underlying cause, as it can indicate the direction of the vestibular stimulation.
**Correct Answer:** C. Nystagmus to the right with the fast phase to the left.