Case Study........................................................................................................................................... 30. Synthesis of Instructional Design Research........................................................................................
Here are some technical specifications to keep in mind for CPR on the Adult when alone: 1  Attempt a 30 to 2 ratio. Thatâs 30 compressions, briefly pause and give 2 ventilations (breaths), then repeat until help arrives. 2  Try to maintain a rate of compressions at 100/min.  Try to keep interruptions of CPR to a minimum.
The downside of ventilation is that when the lungs are inflated with air, the intrathoracic pressure rises and inhibits venous blood return to the heart. Therefore, the keys to effective CPR are twofold: 1  Maintain adequate coronary artery perfusion by compressing the heart at the proper rate and depth.lsewhere in the body during cardiac arrest, blood flow ceases and a large volume of blood accumulates in the veins of the abdomen and thorax. This venous blood has gone through the capillary network and has released only 20%-30% of its oxygen content.