A nurse is caring for a client who has expressive aphasia following a cerebrovascular accident (CVA). Which of the following parameters should the nurse use first in order to assess the client's pain level?

Choice A reason: While understanding the client’s illness and scheduled treatments provides context, it does not directly assess pain. It may help anticipate pain but is not a primary assessment tool. Choice B reason: Behavioral indicators such as facial grimacing, restlessness, guarding, and vocalizations are critical in assessing pain in clients with expressive aphasia who cannot verbalize their discomfort. These indicators are validated tools in non-verbal pain assessment. Choice C reason: A self-report pain scale is the gold standard for pain assessment, but it is not feasible for clients with expressive aphasia who cannot communicate effectively. Alternative methods must be used. Choice D reason: Vital signs like pulse and blood pressure can be affected by pain but are nonspecific and influenced by many other factors such as anxiety, fever, or medications. They are not reliable as primary indicators of pain.