Which of the following is the most common substance found on analysis of a renal stone?

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.

A. Applying ice intermittently - Ice application helps reduce swelling and inflammation by constricting blood vessels. It is effective in managing pain and preventing further tissue damage in contusions, strains, and sprains.

B. Elevating the injured limb - Elevating the injured limb above the level of the heart helps reduce swelling by allowing fluids to drain away from the injured area. This is particularly important in managing contusions, strains, and sprains where swelling is a common symptom. Elevation supports the body's natural healing processes.

C. Resting the affected extremity - Rest is essential to allow the injured tissue to heal. Avoiding movement and stress on the affected area prevents further damage and promotes the healing process. Resting the extremity prevents additional strain on the injured muscles, ligaments, or tendons, allowing the body to repair the damaged tissues effectively.

D. Massaging the affected limb - Massaging the affected limb is generally not recommended in the acute phase of musculoskeletal injuries, especially contusions, strains, or sprains. Massaging can potentially worsen the injury, increase swelling, and cause further tissue damage. It is important to wait until the initial acute phase has passed and consult a healthcare professional before considering massage therapy.

E. Compression dressings - Compression helps control swelling by applying pressure to the injured area. Compression dressings or bandages provide support to the injured limb, minimize swelling, and reduce the risk of further injury. However, it's essential to apply compression correctly to avoid cutting off circulation, and it's usually best done under the guidance of a healthcare provider.