Final answer:
The presence of hand tremors in a client taking lithium carbonate should alert the nurse to monitor for signs of lithium toxicity, which also includes symptoms such as nausea, vomiting, low blood pressure, and sleep issues.D. Hand tremors
Step-by-step explanation:
A nurse reviewing the drug history of a client taking lithium carbonate for bipolar disorder should monitor for lithium toxicity if they observe hand tremors. Hand tremors can be an early sign of lithium toxicity, which is a significant concern when prescribing and monitoring lithium treatment. Other findings that may accompany toxicity include nausea and vomiting, agitation, anxiety, sleep problems, abnormal heart rhythms, low blood pressure, and muscular problems. It is essential to regularly monitor lithium levels in blood and observe for any symptoms of toxicity to manage the patient's treatment effectively.