When preparing to assist with the insertion of a pulmonary artery catheter into a patient, the nurse will anticipate the need to perform which action?

Choice B rationale

Pulseless ventricular tachycardia is a life-threatening cardiac arrest rhythm where the ventricles are contracting so rapidly that there is no effective cardiac output. The ACLS protocol dictates that the most critical intervention is immediate unsynchronized defibrillation. The goal is to deliver an electric shock that simultaneously depolarizes the entire myocardium, allowing the heart's natural pacemaker, the sinoatrial node, to regain control and establish a perfusing rhythm. Every minute delay in defibrillation significantly decreases the chance of survival.

Choice A rationale

Oral beta blockers are used for long-term management of hypertension, heart failure, and stable arrhythmias by blocking the effects of adrenaline on the heart. They have absolutely no role in the emergency treatment of pulseless ventricular tachycardia. In a cardiac arrest scenario, the patient cannot swallow, and the onset of action for oral meds is far too slow. Furthermore, beta blockers decrease heart rate and contractility, which would be counterproductive when trying to restore an active pulse.

Choice C rationale

Carotid sinus massage is a vagal maneuver used to slow down certain types of narrow-complex supraventricular tachycardias in stable patients. It works by stimulating the baroreceptors in the carotid artery to increase parasympathetic tone to the heart. This intervention is entirely ineffective for ventricular arrhythmias and is dangerous to attempt in a pulseless patient. It does nothing to address the rapid, disorganized ventricular firing and wastes precious time that should be spent on CPR and defibrillation.

Choice D rationale

Application of a cooling blanket is a component of targeted temperature management, or therapeutic hypothermia, which may be initiated after a patient has achieved return of spontaneous circulation following a cardiac arrest. The goal is to reduce metabolic demand and protect neurological function. However, it is never an initial intervention for the rhythm itself. The priority remains restoring a pulse through defibrillation and high-quality chest compressions before any post-resuscitation care like temperature management can be considered.

Choice A rationale

Administering sedative or paralytic agents is typically performed prior to or during the actual intubation process to facilitate tube passage and prevent airway trauma. Once the tube is inserted and the cuff is inflated, the priority shifts to verification of placement rather than further sedation. Giving these drugs after insertion does not provide any diagnostic data regarding whether the tube is in the trachea or the esophagus.

Choice B rationale

A chest x-ray is the definitive gold standard for confirming the depth of endotracheal tube placement. It ensures the distal tip of the tube is positioned approximately 2 to 5 cm above the carina. While other methods confirm the tube is in the trachea, the x-ray is essential to ensure it has not migrated into the right mainstem bronchus, which would cause unilateral lung expansion and potential collapse.

Choice C rationale

End-tidal carbon dioxide detection provides immediate physiological feedback that the tube is located within the respiratory tract. Since CO2 is a byproduct of alveolar gas exchange, its presence in exhaled air indicates the tube is in the trachea rather than the esophagus. A colorimetric changer or capnography waveform is a primary tool used immediately after intubation to rule out esophageal placement before further interventions are performed.

Choice D rationale

Auscultation is a critical immediate step to verify bilateral lung expansion and rule out unintentional esophageal or endobronchial intubation. The nurse should listen for equal breath sounds over the midaxillary lines and ensure there are no gurgling sounds over the epigastrium. Epigastric sounds suggest the tube is in the stomach. Breath sounds must be assessed early to ensure both lungs are being ventilated prior to securing the device.

Choice E rationale

Arterial blood gases are useful for evaluating the long-term effectiveness of ventilation and oxygenation after the patient is stabilized on a ventilator. However, they are not used for the initial confirmation of tube placement because the results take too long to obtain. Verification must be instantaneous using physical assessment and CO2 detection to prevent hypoxia. Normal pH is 7.35 to 7.45, and normal PaO2 is 80 to 100 mmHg.