You are instructed to administer 40 mg of methadone (Dolophine) subcutaneously for opioid detoxification. Given that you have a concentration of 30 mg/mL on hand, how much should you draw into the syringe?

Rationale for Choice A: Ensuring the client is warm
While maintaining client warmth is important for comfort and to prevent hypothermia, it is not the immediate priority upon arrival in the postoperative unit. Thermoregulation can be addressed after more urgent assessments have been completed.
Rationale for Choice B: Participating in hand-off report
A thorough hand-off report is essential for continuity of care, but it does not take precedence over assessing the client's immediate physiological status. The nurse can gather information from the report while simultaneously performing essential assessments.
Rationale for Choice C: Checking the surgical dressings
Monitoring surgical dressings is a crucial aspect of postoperative care, but it does not take priority over assessing fluid and blood output. Excessive bleeding or fluid shifts can rapidly compromise the client's hemodynamic stability and require prompt intervention.
Rationale for Choice D: Assessing fluid and blood output
This is the priority action for several reasons:
Monitoring for Hemorrhage: Early detection of excessive bleeding is crucial to prevent hypovolemic shock, a life-threatening complication. Postoperative bleeding can occur internally or externally, and prompt assessment of fluid and blood output allows for timely interventions to control bleeding and maintain hemodynamic stability.

Assessing Fluid Balance: Maintaining fluid balance is essential for optimal organ function and electrolyte balance. Postoperative clients are at risk for fluid imbalances due to blood loss, fluid shifts, and the use of diuretics or IV fluids. Assessing fluid intake and output helps to identify and address fluid imbalances early.
Evaluating Renal Function: Urine output is a key indicator of renal function. Postoperative clients are at risk for acute kidney injury due to factors such as hypotension, blood loss, and nephrotoxic medications. Assessing urine output helps to detect early signs of kidney dysfunction and initiate appropriate interventions.
Guiding Fluid and Blood Product Replacement: The assessment of fluid and blood output provides essential information to guide the administration of fluids and blood products as needed. This ensures that the client's fluid status and oxygen-carrying capacity are maintained within safe parameters.
Therefore, assessing fluid and blood output takes priority as it allows the nurse to identify and address potential life- threatening complications promptly, as well as guide interventions to maintain fluid balance and organ function.

Choice A rationale:
Hyperventilation is a condition characterized by rapid and deep breathing, leading to excessive removal of carbon dioxide (CO2) from the body. This decrease in CO2 levels actually causes respiratory alkalosis, not respiratory acidosis.
CO2 is a weak acid, and its removal from the blood raises the blood pH, making it more alkaline. Key mechanisms involved in hyperventilation-induced respiratory alkalosis:
Increased alveolar ventilation: Hyperventilation increases the rate at which CO2 is expelled from the lungs, reducing its concentration in the blood.
Shift in the equilibrium of the carbonic acid-bicarbonate buffer system: The reduction in CO2 levels drives the equilibrium towards the formation of bicarbonate ions, further reducing the concentration of hydrogen ions and increasing pH.
Renal compensation: The kidneys respond to respiratory alkalosis by excreting more bicarbonate ions, which helps to normalize the blood pH.
Choice B rationale:
Asthma is a chronic respiratory disease characterized by inflammation and narrowing of the airways. This can lead to impaired ventilation and retention of CO2, which can contribute to respiratory acidosis.
Mechanisms by which asthma can cause respiratory acidosis:
Bronchoconstriction: Narrowed airways impede airflow, making it difficult to expel CO2 from the lungs.
Air trapping: Inflammation and mucus production can lead to air becoming trapped in the lungs, further increasing CO2 levels.
Hypoventilation: Severe asthma attacks can cause respiratory muscle fatigue, leading to a decrease in breathing rate and inadequate CO2 removal.
Choice C rationale:
Chronic obstructive pulmonary disease (COPD) is a group of lung diseases characterized by chronic obstruction of airflow. This obstruction can lead to impaired ventilation and retention of CO2, which can contribute to respiratory acidosis.
Mechanisms by which COPD can cause respiratory acidosis:
Emphysema: Destruction of lung tissue reduces the surface area available for gas exchange, making it difficult to expel CO2. Chronic bronchitis: Inflammation and mucus production in the airways can obstruct airflow and trap CO2 in the lungs.
Hypoventilation: COPD can lead to respiratory muscle fatigue and a decrease in breathing rate, further impairing CO2 removal.
Choice D rationale:
Pulmonary embolism (PE) is a blockage of an artery in the lungs, usually by a blood clot. This can lead to impaired gas exchange and a decrease in oxygen levels in the blood. In severe cases, PE can also cause respiratory acidosis due to inadequate CO2 removal.
Mechanisms by which PE can cause respiratory acidosis:
Ventilation-perfusion mismatch: PE obstructs blood flow to a portion of the lungs, reducing the amount of CO2 that can be removed from those areas.
Hypoxemia: Low oxygen levels in the blood can stimulate the respiratory drive, leading to hyperventilation and CO2 retention.
Right heart failure: PE can strain the right side of the heart, leading to decreased pulmonary blood flow and impaired CO2 removal.