The nurse is providing care for a client with a fluid imbalance. The nurse explains that in the body, areas with high concentration of solutes naturally and passively shift to areas of lower concentration. The nurse is describing which process?

Choice A reason: This is not a correct answer because intracorporeal lithotripsy is a procedure that uses a laser or an ultrasonic probe to break up gallstones inside the gallbladder or the bile ducts. It is not a preferred treatment for cholecystitis, as it does not remove the inflamed gallbladder.

Choice B reason: This is a correct answer because laparoscopic cholecystectomy is a surgery that removes the gallbladder through small incisions in the abdomen. It is the preferred treatment for cholecystitis, as it eliminates the source of inflammation and prevents further complications.

Choice C reason: This is not a correct answer because extracorporeal shock wave lithotripsy (ESWL) is a procedure that uses shock waves to break up gallstones outside the body. It is not a preferred treatment for cholecystitis, as it does not remove the inflamed gallbladder and may not be effective for all types of gallstones.

Choice D reason: This is not a correct answer because methyl tertiary butyl ether (MTBE) infusion is a procedure that uses a chemical solvent to dissolve gallstones inside the gallbladder. It is not a preferred treatment for cholecystitis, as it does not remove the inflamed gallbladder and may cause side effects such as nausea, vomiting, and liver damage.

Choice A reason: Dark-colored stools are an adverse effect of orlistat, a medication that blocks the absorption of fat in the intestines. The unabsorbed fat can cause the stools to become oily, foul-smelling, and dark in color. This can indicate a serious condition called steatorrhea, which can lead to malnutrition and vitamin deficiencies.

Choice B reason: Constipation is not an adverse effect of orlistat. In fact, orlistat can cause the opposite problem of diarrhea, especially if the client consumes too much fat in their diet. Constipation may be caused by other factors, such as dehydration, lack of fiber, or medication side effects.

Choice C reason: Nausea is not an adverse effect of orlistat. Nausea may be a symptom of other conditions, such as gastritis, gastroenteritis, or pregnancy. Nausea may also be caused by other medications, such as antibiotics, opioids, or chemotherapy drugs.

Choice D reason: Abdominal pain is not an adverse effect of orlistat. Abdominal pain may be a sign of other conditions, such as appendicitis, gallstones, or kidney stones. Abdominal pain may also be caused by other medications, such as NSAIDs, steroids, or oral contraceptives.