Amiodarone 300 mg IV push would be administered for which rhythm in the ACLS algorithms?

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.

Choice A rationale

While PEEP can eventually lead to improved lung compliance, its primary and immediate mechanical purpose is not the reduction of the work of breathing. In fact, excessively high levels of PEEP can sometimes increase the work of breathing by causing overdistention of the alveoli, making it harder for the patient to initiate a breath or move air effectively. Its therapeutic focus remains on gas exchange rather than the muscular effort of ventilation.

Choice B rationale

This choice is scientifically incorrect because PEEP is specifically designed to increase the functional residual capacity, which is the volume of air remaining in the lungs at the end of a normal expiration. By maintaining positive pressure, PEEP prevents the total collapse of the lungs during the expiratory phase. Decreasing this capacity would lead to widespread atelectasis and a significant decline in the surface area available for gas exchange at the alveolar-capillary membrane.

Choice C rationale

Tidal volume is the amount of air moved in or out of the lungs during a single respiratory cycle and is typically determined by the ventilator settings or the patient's effort. While PEEP improves the environment for air delivery, it is not used as a primary mechanism to increase the specific volume of a single breath. Instead, it maintains a baseline pressure that keeps the respiratory architecture open for the duration of the cycle.

Choice D rationale

The fundamental purpose of PEEP is to improve oxygenation by keeping alveoli open at the end of expiration, a process known as recruitment. This prevents atelectasis and increases the surface area for gas exchange. By maintaining open alveoli, it reduces intrapulmonary shunting, where blood flows past unventilated lung tissue. This mechanism allows for a lower fraction of inspired oxygen to be used while maintaining adequate arterial oxygen tension and systemic delivery.