A patient has digoxin 0.25 mg intravenous push (IVP) prescribed. How would the nurse plan to administer this medication?

Choice A rationale

The pressure bag must be maintained at 300 mmHg to ensure a continuous flush of approximately 3 mL per hour through the system. This high pressure is necessary to overcome the patient’s arterial or pulmonary artery pressure and keep the catheter patent. If the bag is only at 100 mmHg, blood may back up into the tubing, causing clots and inaccurate readings. The nurse must immediately increase the pressure to prevent equipment failure and maintain accuracy.

Choice B rationale

Normal saline is the standard and appropriate fluid used for the flush bag in a hemodynamic monitoring system. It is isotonic and compatible with the patient’s blood, making it the safest choice for maintaining the patency of the invasive line. Since this is a correct and expected finding, the nurse would not need to correct it. Using other fluids, like hypotonic solutions, would be incorrect and could lead to hemolysis or other physiological complications.

Choice C rationale

Zeroing the transducer is a mandatory step to ensure that the monitor ignores atmospheric pressure and only measures the patient’s internal pressures. A good waveform indicates that the system is properly placed and functioning without dampening or interference. This finding represents a correctly set up system that is providing reliable data for clinical decision-making. Therefore, no corrective action is required by the nurse for this specific part of the assessment.

Choice D rationale

Secure connections are vital in any invasive pressure monitoring system to prevent accidental exsanguination or the entry of air into the vascular system. Loose connections can also cause air bubbles, which lead to dampened waveforms and inaccurate pressure readings. Because the connections are noted to be secure, the system is safe and functioning as intended. This is an ideal finding that requires no intervention from the nursing staff to rectify.

Choice A rationale

A stable and intact respiratory drive is a mandatory physiological requirement for extubation. The patient must be able to initiate their own breaths and maintain adequate minute ventilation without the assistance of the mechanical ventilator. This ensures that once the artificial airway is removed, the patient can sustain gas exchange and acid base balance. Assessing spontaneous breathing trials helps confirm that the respiratory muscles are strong enough to overcome the resistance of the upper airway.

Choice B rationale

A heart rate of 190 bpm represents extreme sinus tachycardia or a tachyarrhythmia, indicating significant physiological stress, pain, or hemodynamic instability. Normal adult heart rates should range between 60 to 100 bpm. Attempting to extubate a patient with such a high heart rate would likely lead to cardiovascular collapse or respiratory failure. The sympathetic nervous system is overactive, and the patient's myocardial oxygen demand is too high to safely tolerate the work of spontaneous breathing.

Choice C rationale

A respiratory rate of 30 breaths per minute is elevated, often indicating tachypnea and increased work of breathing. Normal respiratory rates are typically 12 to 20 breaths per minute. A rate of 30 suggests the patient may be struggling to maintain adequate tidal volumes or is experiencing respiratory distress. Weaning and extubation are generally deferred if the rate is consistently high, as it serves as a predictor for post extubation fatigue and the potential need for reintubation.

Choice D rationale

Hemodynamic stability is essential, meaning the patient should have a stable blood pressure and heart rate, ideally without significant vasopressor support. A mean arterial pressure of ≥65 mmHg is generally targeted. If a patient is hemodynamically unstable, the additional metabolic demand of breathing on their own could exacerbate heart failure or shock. Stability ensures that the cardiovascular system can support the increased oxygen consumption required when mechanical ventilatory support is withdrawn from the patient.

Choice E rationale

Patients must be awake, alert, and able to follow commands to protect their own airway after extubation. Being difficult to arouse or unable to follow instructions suggests that the patient cannot cough effectively or clear secretions, posing a high risk for aspiration and airway obstruction. Neurological readiness is as critical as pulmonary readiness. A Glasgow Coma Scale score of ≥8 is often used as a benchmark for considering the safety of removing an endotracheal tube.

Choice F rationale

The primary reason the patient required mechanical ventilation must be resolved or significantly improved before extubation is considered. For example, if the patient had pneumonia, the infection should be controlled and inflammatory markers decreasing. If the underlying cause is still present, the patient will likely fail a spontaneous breathing trial. Reversal of the initial pathology ensures that the patient has the physiological reserve to maintain independent ventilation over the long term without returning to failure.