A nurse is caring for a client with severe dehydration who is receiving IV fluids.
The provider orders a hypertonic saline solution.
Which statement best explains how this fluid will affect the client's cells?
Water will remain evenly distributed between compartments.
Water will move into the cells, causing them to swell.
Sodium will passively diffuse into the cells.
Water will move out of the cells, causing them to shrink.
The Correct Answer is D
Choice A rationale
Water remains evenly distributed between compartments only when the intravenous fluid administered is isotonic, such as 0.9 percent normal saline. Isotonic solutions have an osmolality similar to that of intracellular and extracellular fluids, resulting in no net movement of water across the cell membrane. Hypertonic solutions, by definition, have a higher solute concentration than the cytoplasm of the cells, which creates an osmotic gradient that necessitates the movement of water.
Choice B rationale
Water moves into cells, causing them to swell, when a hypotonic solution is administered. Hypotonic fluids, such as 0.45 percent normal saline, have a lower osmolality than the fluid inside the cells. This causes water to shift from the intravascular space into the intracellular space to equalize concentrations. In the case of hypertonic saline, the concentration of solutes in the blood is higher than in the cells, which prevents water from entering.
Choice C rationale
Sodium does not passively diffuse into cells in significant quantities to equalize osmotic pressure because the cell membrane is selectively permeable and utilizes the sodium-potassium pump to maintain gradients. While some movement occurs, the primary mechanism for balancing the osmotic pressure difference created by hypertonic saline is the movement of water. Osmosis dictates that the solvent moves toward the higher solute concentration, rather than the solute moving to fill the cells.
Choice D rationale
Hypertonic saline has a higher osmolality than the intracellular fluid. When this solution is introduced into the extracellular space, it creates an osmotic pull that draws water out of the cells and into the blood vessels. This process causes the cells to shrink, a process known as crenation. This shift helps expand the intravascular volume in cases of severe dehydration but must be monitored closely to prevent cellular damage and fluid overload.
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Correct Answer is D
Explanation
Choice A rationale
Increased glucose excretion occurs in diabetes as a symptom, not the primary cause of hyperglycemia. When blood glucose levels exceed the renal threshold, which is typically about 180 mg/dL, the kidneys can no longer reabsorb all the glucose, and it spills into the urine. This is known as glucosuria. While this process helps lower blood sugar slightly, the underlying problem in type 2 diabetes remains the body's inability to effectively use the insulin that is already present.
Choice B rationale
A total lack of insulin production is the hallmark of type 1 diabetes, where autoimmune destruction of beta cells occurs. In type 2 diabetes, the pancreas usually produces insulin, and in the early to middle stages, levels can actually be higher than normal as the body tries to compensate for resistance. The scenario explicitly states the patient has high insulin levels, which rules out a production deficiency as the primary issue. High insulin with high glucose confirms a utilization problem.
Choice C rationale
Autoimmune destruction of the pancreas is the underlying mechanism for type 1 diabetes mellitus. In this condition, the body's immune system mistakenly attacks the insulin-producing beta cells in the Islets of Langerhans. This leads to an absolute insulin deficiency. Type 2 diabetes is generally considered a metabolic disorder influenced by genetics and lifestyle, characterized by insulin resistance and relative insulin deficiency, rather than an autoimmune attack on the pancreatic tissue itself. This patient's high insulin levels contradict this.
Choice D rationale
Insulin resistance is the primary pathophysiological defect in type 2 diabetes. In this state, the body's cells, particularly in muscle, fat, and the liver, do not respond normally to insulin. Consequently, glucose cannot easily enter the cells and builds up in the blood. To compensate, the pancreas secretes even more insulin, leading to the hyperinsulinemia mentioned in the question. Despite the abundance of insulin, the "key" no longer fits the "lock" of the cellular receptors effectively. .
Correct Answer is C
Explanation
Choice A rationale
Glucagon levels are actually elevated in diabetic ketoacidosis, as the body perceives a state of starvation because glucose cannot enter the cells. This hormonal imbalance promotes gluconeogenesis and glycogenolysis, worsening hyperglycemia. Furthermore, the condition described is metabolic acidosis, characterized by a low pH of 7.25 and a low bicarbonate of 15 mEq/L, not alkalosis. The fruity breath and rapid Kussmaul respirations are compensatory mechanisms for high acid levels, specifically the accumulation of volatile ketoacids.
Choice B rationale
This client is experiencing severe hyperglycemia with a blood glucose of 420 mg/dL, which is the opposite of hypoglycemia. In type 1 diabetes, there is an absolute deficiency of insulin production due to the autoimmune destruction of pancreatic beta cells. Without insulin, glucose remains in the bloodstream instead of being used for energy. The symptoms of nausea, vomiting, and fruity breath are classic indicators of ketoacidosis resulting from this lack of insulin, not an overproduction of it.
Choice C rationale
In the absence of insulin, cells cannot uptake glucose for fuel, prompting the body to switch to an alternative energy source by breaking down adipose tissue. This process, known as lipolysis, releases free fatty acids that are converted by the liver into ketones, such as acetoacetate and beta-hydroxybutyrate. Ketones are acidic, leading to a drop in blood pH below the normal range of 7.35 to 7.45. The fruity odor is caused by acetone, a byproduct of this metabolic pathway.
Choice D rationale
Aldosterone is a mineralocorticoid that regulates sodium and potassium balance, but it is not the primary driver of diabetic ketoacidosis. While electrolyte imbalances occur in this condition due to osmotic diuresis, the fundamental pathophysiology is a metabolic shift caused by insulin deficiency. Sodium retention is not the cause of the fruity breath, rapid respirations, or the significant drop in bicarbonate. The focus remains on the metabolic acidosis produced by the excessive accumulation of ketones from lipid metabolism. .
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