Final answer:
The most effective initial method to provide artificial ventilation to an apneic adult is the two-person bag-valve-mask technique with 100% oxygen. This helps ensure the patient receives the maximum possible concentration of oxygen.
Step-by-step explanation:
The preferred initial method for providing artificial ventilations to an apneic adult is D: Two-person bag-valve-mask technique with 100% oxygen. This technique ensures that the individual receives the maximum possible oxygen concentration, which is crucial in an apneic state. It involves two rescuers, where one squeezes the bag to deliver breaths while the other maintains an airtight seal with the mask on the patient's face. In comparison, a flow-restricted, oxygen-powered ventilation device (A) or the mouth-to-mask technique with supplemental oxygen (B) may not deliver enough oxygen to the patient. A one-person bag-valve-mask technique (C) could be more challenging due to the difficulty of maintaining a good mask seal single-handedly.
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