Puzzled by facies
Regional protocols have use doing 200 compressions before AED.
"In unwitnessed cardiac arrest, give first 2 minutes of CPR without interruptions for ventilation. During this time period passive oxygenation is preferred with OPA and NRB facemask. If arrest is witnessed by EMS, immediate defibrillation is first priority" and thus get a monitor on and ALS can shock VF/VT ASAP, but PEA/Asystole, 2 minutes of straight compressions before you go to epi, then they want another two minutes of straight CPR without ventilation before more drugs, airway interventions, or BVM.
Yes, this concept was taught in the 2005 protocols -- if you didn't see it and no bystander CPR was provided, start with a couple minutes of compressions to "prime the pump." Further research suggested it may or may not be beneficial, so the 2010 recommendations deemphasized it. However, I've never seen anything that supported 10 minutes.