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I just did red cross CPR and AED training last week, and the materials said the clothes all need to come off (or pulled up or whatever - off the chest) but chest hair doesn't need to be shaved. Presumably the instructions change periodically.
Its probably much better to have a shaved chest, but lets be realistic. In a situation where CPR and an AED are being used, 1. you probably arent going to have a razor handy 2. the sub-optimal contact with the skin is the least of you (or the patient's) worries.
I took a course a couple of years agao and I believe they said the AEDs come with a razor
Can confirm. Almost all defibrillators come with a pack of additional supplies - including a dry razor
They also teach now to use the provided additional set of pads to basically wax the chest.
It's only an issue on very hairy chests -- i.e. full "bearskin rug" where you need to place the pads. There are patients that have so much hair the pads aren't even touching skin.
In which case you absolutely need to remove the hair. A slightly delayed initial defibrillation is better than multiple ineffective ones. Most AED kits should have a spare set of pads ("wax the chest" with the first set) or a disposable razor.
You're not going to take time to shave, every second counts. The solution is the extra adhesive pads most every AED has. You plant one of those on the the chest hair and rip, and you can get an effectively hairless spot for your lead.
The instructions say that chest hair comes off if the pad isn't sticking effectively to the chest. That means shaving if you have a razor, or using the second adhesives (kid/adult sizes usually come in the same AED kit) as ad hoc waxing devices.