Final answer:
The nurse should elevate the head of the bed to the semi-fowler position.
Step-by-step explanation:
The nurse should first elevate the head of the bed to the semi-fowler position after reviewing the client's clinical record and assessing the client. This is because the client had a syncopal episode (fainting) after abruptly standing up, which may indicate orthostatic hypotension. Elevating the head of the bed to a semi-fowler position helps improve blood flow to the brain and prevent further episodes of fainting.