The nurse evaluates a client's response to hemodialysis.
Which finding indicates an expected outcome?

Managing an open pneumothorax requires immediate stabilization of the chest wall to restore pleural pressure dynamics. Knowledge of respiratory mechanics and the prevention of tension pneumothorax is essential to prioritize the correct occlusive dressing technique before proceeding with secondary medical interventions.

Choice A rationale: While a chest tube is the definitive treatment to re-expand the lung and drain the pleural space, it is not the first action. The immediate life-threatening air leak through the wound must be addressed first to stabilize the patient.

Choice B rationale: Administering high-flow oxygen is supportive and necessary, but it will not resolve the primary issue of an open sucking chest wound. Without sealing the atmospheric air entry point, the patient's respiratory effort will remain severely compromised by the pneumothorax.

Choice C rationale: Applying a sterile occlusive dressing taped on three sides creates a one-way valve. This allows trapped air to escape the pleural space during expiration while preventing atmospheric air from entering during inspiration, effectively preventing the development of a tension pneumothorax.

Choice D rationale: Initiating large-bore IV access is a critical part of trauma resuscitation to manage potential shock and administer fluids. However, in the hierarchy of trauma care, the "Breathing" intervention of sealing a sucking chest wound takes precedence over "Circulation" access.

Managing chronic kidney disease requires understanding the reciprocal relationship between calcium and phosphorus. Knowledge of renal osteodystrophy, vitamin D activation, and the role of the parathyroid hormone in mineral homeostasis is essential to identify the associated electrolyte shift.

Choice A rationale

Hypokalemia is not the primary association with hypocalcemia in kidney failure. Chronic kidney disease usually results in hyperkalemia, where potassium exceeds 5.0 mEq/L, because the failing kidneys cannot effectively excrete excess potassium ions into the urine.

Choice B rationale

Hypernatremia is an elevation of sodium above 145 mEq/L and is not directly linked to the calcium-phosphorus axis. While fluid balance is impaired in renal failure, sodium levels vary based on fluid volume status rather than hypocalcemia.

Choice C rationale

In kidney failure, phosphorus excretion decreases, leading to hyperphosphatemia. High serum phosphorus (above 4.5 mg/dL) binds with calcium, causing hypocalcemia (below 8.5 mg/dL). Additionally, decreased vitamin D activation in the kidneys further reduces calcium absorption from the gut.

Choice D rationale

Hyponatremia, or sodium below 135 mEq/L, often results from fluid overload in renal patients but is not the metabolic driver of low calcium. The hallmark mineral imbalance involves the inverse relationship specifically between serum phosphate and ionized calcium.