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: Decreased heart rate is not a manifestation of hypovolemia. Hypovolemia is a condition where there is a decreased volume of blood in the body, which can result from blood loss, dehydration, or fluid shifts. Hypovolemia can cause the heart rate to increase, not decrease, as the body tries to compensate for the low blood pressure and maintain adequate perfusion.

Choice B reason: Increased blood pressure is not a manifestation of hypovolemia. Hypovolemia can cause the blood pressure to decrease, not increase, as the blood volume and cardiac output are reduced. The body may try to constrict the blood vessels to increase the blood pressure, but this is usually not enough to overcome the effects of hypovolemia.

Choice C reason: Weak pulse is a manifestation of hypovolemia. Hypovolemia can cause the pulse to become weak, thready, or difficult to palpate, as the blood flow and pressure are diminished. The pulse may also become irregular or rapid, as the heart tries to pump faster and harder to deliver oxygen to the tissues.

Choice D reason: Dyspnea is not a specific manifestation of hypovolemia. Dyspnea is a term for difficulty breathing, which can have many causes, such as asthma, pneumonia, or pulmonary edema. Hypovolemia can cause dyspnea if it leads to shock, which is a life-threatening condition where the organs and tissues are not receiving enough oxygen. However, dyspnea alone is not enough to indicate hypovolemia.

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.