A nurse on a medical unit has just received change-of-shift report. Which of the following clients should the nurse assess first?

Choice A reason: Chest pain in a client with a recent myocardial infarction is a priority because it may indicate ongoing ischemia or reinfarction. Even moderate pain (rated 4/10) requires immediate assessment and intervention to prevent life-threatening complications. This makes option A the correct answer. Choice B reason: A temperature of 38.3° C (101° F) in a client with AIDS and pneumonia is concerning but not immediately life-threatening. This client requires monitoring and treatment, but the situation is less urgent than chest pain in a post-MI client. Choice C reason: An oxygen saturation of 89% in a client with COPD is below normal but may be expected in advanced disease. While this requires intervention, it is not as immediately critical as chest pain in a post-MI client. Choice D reason: Inability to void in a client with pelvic inflammatory disease is uncomfortable and requires evaluation, but it is not immediately life-threatening. This option is lower priority compared to acute cardiac symptoms.