A nurse is caring for a client with acute pyelonephritis. Which area should the nurse percuss to assess for pain related to pyelonephritis?

A. Urinary tract infection
The symptoms described, including recent mental status changes and periods of incontinence, are suggestive of a urinary tract infection (UTI) in an elderly individual. UTIs are common among older adults and can cause a variety of symptoms, including confusion, which is often the primary manifestation in the elderly population. Other symptoms can include urinary urgency, frequency, and incontinence.

B. Acute kidney failure - While acute kidney failure can cause changes in urination and mental status, it is less likely to be the primary cause of these symptoms in this scenario. UTI is a more common and immediate concern given the symptoms described.

C. Septic shock - Septic shock is a severe condition that occurs when an infection leads to a life-threatening drop in blood pressure. While septic shock can cause altered mental status, it is a critical condition that often presents with more dramatic symptoms and requires immediate intensive care management. The symptoms described are more suggestive of a UTI.

D. Urinary stasis - Urinary stasis refers to the slowing or cessation of urine flow. While urinary stasis can contribute to the development of UTIs, it is not a condition that would cause sudden and acute mental status changes and incontinence on its own. UTI is a more likely cause of the symptoms described.

A. McBurney's point on the abdomen: McBurney's point is a location in the right lower quadrant of the abdomen that is significant in the assessment for appendicitis. It is not relevant to the assessment of pyelonephritis, which is a kidney infection.

B. Psoas sign at the knee: The psoas sign is a test for appendicitis, not pyelonephritis. It involves the patient lying on their back and lifting their right leg against resistance. If this movement causes pain in the lower right abdomen, it could indicate irritation of the psoas muscle due to an inflamed appendix.

C. Rovsing's Sign on the abdomen: Rovsing's sign is also a test for appendicitis. It involves palpating the left lower quadrant of the abdomen and observing if it causes pain in the right lower quadrant. The presence of pain in the right lower quadrant during palpation of the left lower quadrant can indicate appendicitis. This sign is not specific to pyelonephritis.

D. Costovertebral angle (CVA) on the back: The CVA is located on the back at the angle formed by the 12th rib and the spine. Percussion of the CVA is a common technique used to assess for kidney tenderness. In the case of acute pyelonephritis, infection and inflammation of the kidneys can cause tenderness and pain in the CVA area. Therefore, this area is assessed for pain related to kidney infections like pyelonephritis.