A client complained of nausea, a metallic taste in her mouth, and fine hand tremors 2 hours after her first dose of lithium carbonate (Lithane). What is the nurse's best explanation of these findings?

Correct Answer: A

Rationale: Early lithium side effects (nausea, tremors) are common and usually transient.

Correct Answer: B

Rationale: Side-lying prevents aspiration during a seizure, the immediate priority.

Correct Answer: A

Rationale: Chlorpromazine causes photosensitivity; sunlight avoidance prevents skin reactions.

Correct Answer: D

Rationale: Safety is paramount in severe depression due to suicide risk.

Correct Answer: C

Rationale: Respiratory rate is a critical vital sign that reflects how well a patient's body is oxygenating and removing carbon dioxide, key components of basic physiological functioning. It directly indicates the efficiency of the respiratory system, which is essential for life. Pain level, while important for comfort, is subjective and not a direct measure of physiological function. Skin color can provide clues about circulation or oxygenation but is less specific and quantifiable than respiratory rate. Dietary preferences are unrelated to immediate physiological assessment, as they pertain to nutrition rather than real-time bodily function. Nurses monitor respiratory rate to detect distress or deterioration quickly, making it a fundamental metric in patient care. Understanding its significance ensures timely interventions, especially in emergencies where breathing is compromised.