A patient sustained trauma to the chest that caused severe impairment of the primary pacemaker cells of the heart. The nurse understands that which area of the cardiac system received the greatest damage?

Choice A rationale

Administering antianxiety medication is a comfort measure but does not address the immediate physiological risks associated with suctioning. Suctioning induces transient hypoxia and increases myocardial oxygen demand, which can lead to dysrhythmias. While reducing patient distress is important for overall care, it is not the highest priority when compared to maintaining adequate cellular oxygenation during an invasive procedure that actively removes oxygen from the airway.

Choice B rationale

Instilling normal saline into the endotracheal tube was once common practice but is now discouraged because it does not effectively thin secretions. Instead, it can displace bacteria from the inner lumen of the tube deeper into the lower respiratory tract, increasing the risk of ventilator-associated pneumonia. It also decreases oxygen saturation significantly. Hydration and humidification are the preferred systemic methods for managing thick pulmonary secretions in intubated patients.

Choice C rationale

Suctioning removes both secretions and oxygen from the airway, which can lead to severe hypoxemia, bradycardia, or even cardiac arrest. Providing 100 percent FiO2 for at least 30 to 60 seconds prior to the procedure creates an oxygen reserve in the lungs. This prevents the hemoglobin saturation from dropping to dangerous levels during the periods of apnea and negative pressure. This action is the highest priority to ensure patient safety.

Choice D rationale

Auscultation is a necessary assessment to evaluate the effectiveness of the suctioning procedure and to ensure the airway is clear. However, it is an evaluative step performed after the intervention has occurred. While it helps determine if further suctioning is required, it does not prevent the immediate life-threatening complications of hypoxia that occur during the procedure itself. Therefore, it remains secondary to the proactive step of pre-oxygenation.

Choice A rationale

Flushing with saline before administration is correct to ensure line patency, but giving a potent medication like digoxin as a rapid push is unsafe. Digoxin is a cardiac glycoside that increases the force of myocardial contraction and slows the heart rate. Normal serum levels are 0.5 to 2.0 ng/mL. Rapid administration can cause intense vasoconstriction and cardiac arrhythmias. It must be delivered slowly to allow the medication to distribute and to monitor the heart's response.

Choice B rationale

Administering the medication first without ensuring the line is patent is poor practice. More importantly, waiting five minutes before flushing does not address the need for a slow, controlled delivery of the drug. Digoxin must be administered slowly over at least five minutes to prevent toxic peaks and to mitigate the risk of bradycardia or heart block. Flushing after the medication is necessary to ensure the entire dose is delivered from the IV tubing into the bloodstream.

Choice C rationale

Injecting intravenous push medications into a primary IV bag is generally incorrect for drugs intended for rapid but controlled delivery. This dilutes the medication significantly and changes the rate of delivery to whatever the primary infusion rate is set to, rather than the intended five minute duration. Digoxin should be given as a slow direct injection or via a secondary "piggyback" if specified, but the standard protocol for IVP digoxin is slow manual administration over several minutes.

Choice D rationale

The safest method for administering digoxin IVP is to inject it slowly in small increments over a period of at least five minutes. This slow delivery minimizes the risk of sudden cardiac toxicity and allows the nurse to monitor the patient for adverse effects like significant bradycardia. Following the medication with a saline flush ensures the full dose reaches the patient. This controlled approach is vital because digoxin has a narrow therapeutic index and potent effects on cardiac conduction.