A client with acute renal injury (AKI) weighs 110.3 pounds (50 kg) and has a potassium level of 6.7 mEq/L (6.7 mmol/L) is admitted to the hospital. Which prescribed medication should the nurse administer first?

Reference Range:
Potassium [3.5 to 5 mEq/L (3.5 to 5 mmol/L)]

Choice A reason: The humoral immune response is mediated by B cells that produce antibodies against specific antigens. However, this response is not the main problem in AIDS, because B cells are not directly affected by the human immunodeficiency virus (HIV) that causes AIDS. Therefore, this choice is incorrect.

Choice B reason: The cellular immune response is mediated by T lymphocytes that activate other immune cells, such as macrophages, to destroy infected or abnormal cells. This response is the main problem in AIDS, because HIV infects and destroys CD4+ T cells, which are essential for coordinating the cellular immunity. As a result, the client becomes susceptible to opportunistic infections, such as Pneumocystis jiroveci pneumonia. Therefore, this choice is correct.

Choice C reason: Bone marrow suppression of white blood cells can cause immunodeficiency, but it is not the primary cause of AIDS. Bone marrow suppression can occur as a side effect of some drugs or treatments, such as chemotherapy or radiation therapy, but it is not directly caused by HIV. Therefore, this choice is incorrect.

Choice D reason: Exposure to multiple environmental infectious agents can challenge the immune system, but it does not necessarily cause it to fail. The immune system can adapt and respond to different pathogens, unless it is compromised by an underlying condition, such as AIDS. Therefore, this choice is incorrect.

Choice A reason: This is incorrect because hepatorenal failure is a condition that involves both liver and kidney dysfunction, usually as a complication of cirrhosis or portal hypertension. The symptoms of hepatorenal failure may include jaundice, ascites, edema, oliguria, or encephalopathy. However, these are not consistent with the client's presentation of fever, abdominal pain, vomiting, and elevated amylase and lipase levels.

Choice B reason: This is correct because acute pancreatitis is an inflammation of the pancreas that can be caused by gallstones, alcohol abuse, trauma, infection, or drugs. The symptoms of acute pancreatitis may include fever, upper abdominal pain that radiates to the back, nausea, vomiting, and elevated amylase and lipase levels. These are consistent with the client's presentation and suggest that the cholecystectomy may have triggered an attack of acute pancreatitis.

Choice C reason: This is incorrect because surgical site infection is an infection that occurs at or near the incision site after surgery. The symptoms of surgical site infection may include redness, swelling, warmth, pus drainage, or pain at the wound site. However, these are not consistent with the client's presentation of fever, abdominal pain radiating to the back, vomiting, and elevated amylase and lipase levels.

Choice D reason: This is incorrect because biliary duct obstruction is a blockage of the bile ducts that carry bile from the liver and gallbladder to the intestine. The causes of biliary duct obstruction may include gallstones, tumors, inflammation, or scarring. The symptoms of biliary duct obstruction may include jaundice, dark urine, pale stools, itching, or abdominal pain. However, these are not consistent with the client's presentation of fever, abdominal pain radiating to the back, vomiting, and elevated amylase and lipase levels.