In recent years, studies have been looking at both what happens in the heart (CPR - cardiopulmonary resuscitation) and what happens in the brain (CCR - cardiocerebral resuscitation). Once the SCA has taken place the emphasis must be on getting blood to flow through both of these organs.
Science has shown that if we do not push the chest deeply enough then blood is not pushed out efficiently. In fact it has been found that it takes several properly performed compressions to establish blood flow through the brain. It can take as many as 7 to 12 properly performed compressions to get blood moving through the brain. Not fully allowing the chest to recoil dramatically impacts effectiveness as well.
For more information on articles dealing with the importance of the quality of CPR performed, see the articles below.
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Christine Kilgore. Stricter Adherence to CPR Guidelines Would Aid Survival Acep News. Aug 2008
Heidrun Losert, MD; Fritz Sterz, MD; et al. Quality of Cardiopulmonary Resuscitation Among Highly Trained Staff in an Emergency Department Setting. Arch Intern Med. 2006.
Wik L, Kramer-Johansen J, Myklebust H, et al: "Quality of cardiopulmonary resuscitation during out-of-hospital cardiac arrest." JAMA. 2005.
Abella BS, Alvarado JP, Myklebust H, et al: "Quality of cardiopulmonary resuscitation during in-hospital cardiac arrest." JAMA. 293(3):305–310, 2005.
Aufderheide TP, Pirallo RG, Yannopoulos D, et al: "Incomplete chest wall compression: a clinical evaluation of CPR performance by EMS personnel and assessment of alternate manual chest compression-decompression techniques." Resuscitation. 64(3):353–362, 2005.
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