A ferritin level of 30 ng/mL with suspected periodic limb movements prompts which therapy?

A ferritin level of 30 ng/mL with suspected periodic limb movements prompts which therapy?

• A. Clonazepam
• B. Ferrous sulfate
• C. Gabapentin
• D. Sertraline

Answer: (B)

Iron stores are low, as shown by a ferritin level of 30 ng/mL, and periodic limb movements in a child are commonly related to iron-deficiency–related dysfunction in central dopamine signaling. Iron is a crucial cofactor for dopamine synthesis, and when stores are depleted, brain dopamine activity drops, contributing to restless legs and limb movements. Replenishing iron with ferrous sulfate addresses the underlying issue and often improves PLMs and associated discomfort, making it the appropriate first-line therapy in this scenario. Other options don’t tackle the root cause. Clonazepam can help with sleep symptoms but doesn’t fix iron deficiency and carries sedative risks. Gabapentin may be considered if symptoms persist after iron repletion or in certain cases, but iron therapy is the initial step. Sertraline can worsen restless legs and isn’t used to treat PLMD.

Iron stores are low, as shown by a ferritin level of 30 ng/mL, and periodic limb movements in a child are commonly related to iron-deficiency–related dysfunction in central dopamine signaling. Iron is a crucial cofactor for dopamine synthesis, and when stores are depleted, brain dopamine activity drops, contributing to restless legs and limb movements. Replenishing iron with ferrous sulfate addresses the underlying issue and often improves PLMs and associated discomfort, making it the appropriate first-line therapy in this scenario.

Other options don’t tackle the root cause. Clonazepam can help with sleep symptoms but doesn’t fix iron deficiency and carries sedative risks. Gabapentin may be considered if symptoms persist after iron repletion or in certain cases, but iron therapy is the initial step. Sertraline can worsen restless legs and isn’t used to treat PLMD.