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Face shields are a simple way of protecting yourself against possible infection or coming into contact with vomit or other substances. Remember that one option is not to do the breaths at all. If you cannot bring yourself to give breaths, you can do chest compressions only.
The face shield needs to be removed from the packaging and then you simply place it over the mouth and nose. All the designs are similar, some are more advanced than others. With extra training, you may use a bag mask.
When using a bag valve mask, the most important thing is to ensure a good seal between the mask and patient's face. Without a good seal, oxygen will escape into the room and the patient will not get adequate airflow. Some bag valve masks need to be attached to a flow of oxygen. A rescuer can also use a valve mask, without a reservoir, using room air. Attach the bag valve mask to a face shield of the size appropriate for the patient. To ensure a good seal, use the C-E technique. The mask is not pushed onto the patient; the head and face of the patient are drawn into the mask.
When breathing for a patient with a bag valve mask, ensure that the airway is in an optimal position for the free flow of air. To place the mask on the patient, have the right sized face shield and use the C-E technique to draw the patient's face into the mask. Watch for chest rise and fall to ensure that a proper seal has been made and the air is going into the lungs.
BVMs are not common practice in the workplace or in first aid kits but they offer an excellent way of ensuring effective breaths without the need for mouth to mouth contact.