Final answer:
The nurse should first assess the client who underwent a thoracotomy and has a chest tube with 150 mL of bright-red blood in the collection chamber, as this may indicate a life-threatening hemorrhage needing immediate attention.
Step-by-step explanation:
The nurse should prioritize patient assessments based on the severity and potential for rapid deterioration. When deciding which postoperative client to assess first, the nurse should consider the following scenarios:
A. Thoracotomy with chest tube: This client has 150 mL of bright-red blood in the collection chamber from the past hour, which could indicate hemorrhage, a critical and potentially life-threatening situation requiring immediate assessment.
B. Small bowel resection with absent bowel sounds: Absent bowel sounds may occur postoperatively and require monitoring, but this does not indicate an immediate life-threatening condition compared to active bleeding.
C. Tonsillectomy with coffee-ground emesis: Coffee-ground emesis suggests old blood and while it is concerning, it does not indicate recent or active bleeding as much as bright-red blood does.
D. Total knee arthroplasty with pain level of 7/10: Pain management is important after surgery, but severe pain without other signs of complication is not as immediate a threat to life as hemorrhage is.
Considering these factors, the priority is to assess the client who underwent a thoracotomy as the presence of bright red blood may signal a severe complication such as bleeding that could lead to hypovolemic shock.