Which of the following is a key factor in cardiac arrest among trauma patients?

Hypoxemia is a critical factor in cardiac arrest among trauma patients because it refers to a deficiency of oxygen in the blood, which is essential for sustaining the function of vital organs, including the heart. During trauma, patients often experience significant blood loss or compromised respiratory function, leading to inadequate oxygenation.

When the body and, specifically, the heart muscle is deprived of oxygen, it cannot function effectively. The heart relies on a steady supply of oxygen to generate the energy it needs to contract and pump blood throughout the body. Insufficient oxygen levels can quickly lead to arrhythmias and ultimately cardiac arrest if not promptly addressed. Therefore, in trauma scenarios, ensuring adequate oxygen delivery and maintaining airway patency are primary interventions to prevent hypoxemia and subsequent cardiac complications.

While the other factors such as hyperkalemia, medication interactions, and underlying heart disease can contribute to cardiac arrest in various contexts, hypoxemia is particularly critical in the acute setting of trauma where immediate physiological responses and interventions are necessary to stabilize the patient.