Final answer:
The PN should help the dizzy client to a safe position, monitor their condition, and then address the underlying causes of the orthostatic hypotension, such as dehydration, medication effects, or autonomic failure.
Step-by-step explanation:
When a client experiences dizziness during an orthostatic blood pressure measurement, the practical nurse (PN) should ensure the client's safety first. The PN should assist the client to sit or lie down immediately to prevent falls and further injury. Monitoring the client's vital signs is also essential to assess their condition. Once stable, the PN would attempt to identify the cause of the orthostatic hypotension, which could include dehydration, medication effects, or a more serious underlying condition such as autonomic failure. Interventions might include adjusting medications, increasing fluid intake, and addressing any underlying disorders, such as diabetes, to control blood glucose levels and improve neurological functions.