Final answer:
A positive response to carotid sinus massage indicates a high likelihood of neurally mediated syncope.
Step-by-step explanation:
A positive response to carotid sinus massage indicates a high likelihood of neurally mediated syncope. Neurologically mediated syncope, also known as vasovagal syncope, occurs when there is a temporary disruption in the normal functioning of the autonomic nervous system. This can lead to a sudden drop in blood pressure and heart rate, resulting in fainting or loss of consciousness.