Final answer:
The therapist should next sit the client at the edge of the bed to engage core muscles and improve balance, with appropriate safety measures to prevent falls.
Step-by-step explanation:
The therapist should attempt to sit the client at the edge of the bed next. This is a more progressive posture than simply elevating the head to 80 degrees and is a prerequisite to more advanced balance activities like transferring to a chair or attempting to stand by the bed. Sitting at the edge of the bed allows the client to engage the core muscles and work on balance, which is required for sitting up to eat and minimizing the risk for aspiration. However, because of the limited arousal and potential for impaired balance following a middle cerebral artery stroke, it will be important to ensure that safety measures are in place to prevent falls or tipping over. The therapist can gradually increase the client's tolerance to sitting up and can assess the readiness for more challenging activities as the client's condition improves.