Know Your Oxygen-Delivery Masks 1

By Patty Seery
When a dive accident occurs, prompt action can greatly improve the outcome — if the rescuers respond appropriately. Oxygen administration is a critical element of first aid for dive accidents, but there are several ways to do it. Oxygen units include various delivery systems, including oronasal masks, nonrebreather masks and bag valve masks, so divers should know the appropriate mask to use in each situation.
Oronasal Masks

Oronasal mask
The oronasal mask is the most versatile and effective delivery device in most circumstances. When used properly, it can deliver a high fraction of oxygen to breathing, responsive injured divers as well as unresponsive injured divers who are not breathing on their own. Rescuers can use these masks in conjunction with demand valves — the default oxygen regulator, which administers oxygen as the injured diver inhales — as well as with manually triggered ventilators, which are used to deliver breaths of oxygen to divers who are not breathing on their own.

Oronasal masks have air-cushioned edges that adapt to a variety of face shapes and elastic straps to facilitate a good seal. They also feature oxygen inlets for administering supplemental oxygen when using the mask to provide ventilations to a nonbreathing diver. Oronasal masks are reusable, provided they are cleaned and their one-way valves are replaced.



When using an oronasal mask, rescuers should ensure a good seal by using the elastic strap and proper hand positioning. When the injured diver is breathing and responsive, the diver can help with maintaining the mask seal. Rescuers using the mask for CPR or to support inadequate breathing should use two hands to create an effective seal around the entire perimeter of the mask.
Find the full article here: http://www.alertdiver.com/Oxygen-Delivery_Masks 

© Alert Diver — Q1 Winter 2018

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