What condition may be suspected in a client with rigidity, tremor, bradykinesia, and impaired postural reflexes?

The symptoms of rigidity, tremor, bradykinesia, and impaired postural reflexes are hallmark indicators of Parkinson's disease. This neurodegenerative disorder primarily affects movement control due to the loss of dopamine-producing neurons in the brain, particularly in the substantia nigra region.

Rigidity refers to the resistance to passive movement, often accompanied by a "cogwheel" sensation. Tremors are typically observed at rest, and bradykinesia is characterized by slowness of movement, making everyday tasks challenging. Impaired postural reflexes contribute to difficulties with balance and increase the risk of falls.

In contrast, the other conditions listed are associated with different sets of symptoms. Multiple sclerosis involves a range of neurological symptoms due to demyelination, while Huntington's disease is marked by chorea and cognitive decline. Alzheimer's disease primarily affects memory and cognitive function, rather than motor control. Hence, the combination of the specific motor symptoms aligns directly with Parkinson's disease, confirming it as the correct choice.