Which process should be followed when providing positive pressure ventilation?

When providing positive pressure ventilation, ensuring a proper seal of the mask to the patient's facial structure is essential. A secure mask fit is crucial because it prevents air leaks and ensures that the ventilatory effort effectively delivers oxygen into the lungs. An inadequate seal can lead to complications such as ineffective ventilation and inadequate oxygenation, as air may escape rather than entering the patient's airway.

In practice, a good seal allows the rescuer to effectively move the diaphragm and deliver the necessary volume of air or oxygen needed by the patient. This step is foundational in maintaining the efficacy of positive pressure ventilation, whether using a bag-valve-mask (BVM) or another device.

Other processes, such as ventilating slowly or over-inflating the lungs, can lead to respiratory complications or barotrauma, highlighting the importance of proper technique and the need to avoid excessive volumes. Additionally, relying on expired bags or using 100% oxygen at all times can compromise patient safety and is not a standard practice in all situations. Therefore, the focus on a proper seal reflects the best practice in ensuring effective positive pressure ventilation.