Advanced Cardiovascular Life Support (ACLS) Practice Exam

During the defibrillation sequence, it is crucial to ensure that oxygen is not blowing over the patient's chest when delivering a shock. This is because the presence of oxygen in a concentrated form, coupled with the electrical discharge from the defibrillator, poses a risk of ignition and can lead to fire, which can be detrimental in a medical emergency. Therefore, ensuring that supplemental oxygen is not in use over the patient's chest is essential for maintaining safety during this critical procedure.

The other practices, while important to consider in various contexts, do not directly address the immediate safety risk presented by defibrillation. For example, having the patient on a flat surface is important for effective electrical conductivity but does not carry the same immediate safety concern regarding igniting oxygen. Likewise, limiting the number of personnel can help reduce chaos, but it is not directly related to the risk of fire during defibrillation. Turning off all monitoring devices may not be practical or beneficial, as monitoring can provide vital information during the defibrillation process.