Hi sir, this is okay. Another term for this is compression only cpr. This has been approved for lay people and is widely used in the united states. Most emergency medical dispatchers now advised this to callers while waiting for the arrival of the ambulance service. However, for countries where the ambulance arrives late, in my opinion, compression only cpr may not be that effective anymore considering that oxygen is also vital to the brain. Compression thus provide circulation but in the long run the retained oxygen in the blood runs out, so there is the need for blowing. The good thing about the unites states is that the response time of their ambulance service is quite fast. But for countries like ours, often its late and that is why most of those performing cpr only to their patients, ends up with a patient pronounce DOA in the hospital.