What response indicates a positive clonus test?

• A. Extension and splaying of toes
• B. Rhythmic "beats" felt in the hand when dorsiflexing the foot
• C. Involuntary contraction of limb muscles
• D. Flexion of the toes

Answer: (B)

A positive clonus test is indicated by the presence of rhythmic "beats" felt in the hand when the foot is dorsiflexed. Clonus is a neuromuscular condition characterized by involuntary, rhythmic contractions and relaxations of a muscle or group of muscles. When performing the clonus test, the healthcare provider dorsiflexes the foot, and if there is a presence of quick, rhythmic contractions (or "beats"), it signifies that there is potentially hyperactive spinal reflexes, which may suggest an upper motor neuron lesion.

This is important as it can point toward conditions affecting the central nervous system, such as multiple sclerosis or other neurological disorders. The presence of these rhythmic beats during the test signifies an abnormal response, confirming the findings associated with the clonus test, thereby affirming the presence of neurological impairment that needs further evaluation or intervention.