A client is prescribed alpha-blockers as part of the management of renal calculi. The nurse explains that these medications can help with stone passage by:

A. This is the correct answer. Calcium oxalate stones are common, and limiting the intake of foods high in oxalate, such as spinach, nuts, and certain other vegetables and fruits, can help reduce the risk of stone recurrence.

B. Increasing the intake of red meat and fish is not recommended to prevent calcium oxalate stones. In fact, high intake of animal protein may increase the risk of certain types of stones, such as uric acid stones.

C. Consuming carbonated beverages is not recommended to improve kidney function or prevent kidney stones. Some carbonated beverages may contain phosphoric acid, which can contribute to stone formation.

D. Avoiding dairy products is not recommended to prevent calcium oxalate stone formation. In fact, adequate dietary calcium intake from food sources may help reduce the risk of these stones.

A. Uric acid stones may cause pain, but they do not typically present with costovertebral angle tenderness. Uric acid stones are more likely to be associated with gout and hyperuricemia.

B. Calcium oxalate stones are common and can cause pain, but they do not typically cause costovertebral angle tenderness. They are more likely to cause localized pain in the back or side.

C. This is the correct answer. Struvite stones, also known as infection stones, can cause severe pain that radiates to the back and lower abdomen. They are often associated with urinary tract infections, and the presence of an infection can lead to costovertebral angle tenderness.

D. Cystine stones are rare and are more likely to cause chronic, dull pain rather than sudden and severe pain with tenderness.