A nurse is assessing a client who received midazolam IV for moderate (conscious) sedation. Which of the following assessments is the nurse's priority?

A. Temperature is important but not the priority following sedation. B. Oxygen saturation is the priority assessment, as midazolam can depress respiratory function, leading to hypoxia or respiratory arrest. C. Heart rate is important but secondary to oxygenation in this case. D. Level of consciousness is monitored but is not the priority over respiratory status.