Final answer:
Among the options provided, urine output less than 30 mL/hour after CABG is the most concerning and should be reported immediately as it could indicate inadequate perfusion and possible renal failure.
Step-by-step explanation:
The question asks which of the following client findings following a coronary artery bypass graft (CABG) should be reported by the nurse. Among the options provided, the most concerning finding that warrants immediate reporting is D. Urine output less than 30 mL/hour. Postoperative patients, especially after major surgery like CABG, are at risk for complications including inadequate perfusion of organs and acute kidney injury. A low urine output could indicate that the kidneys are not being perfused adequately and may be a sign of renal failure or other serious complications such as bleeding or cardiac problems that are reducing the output of the heart. This is a critical finding and should be reported immediately to ensure prompt intervention.
Options A, B, and C, while important to note, are not as immediately concerning as option D. Incisional pain with movement (A) and serosanguinous drainage on the dressing (B) are common postoperative findings and expected to an extent. A blood pressure of 140/90 mmHg (C) is slightly elevated, which may be due to stress, pain, or other factors, but is not as urgent as the urine output issue without other signs of concern.