Final answer:
If a victim's chest doesn't clearly rise, you should begin CPR immediately.
Step-by-step explanation:
If a victim's chest doesn't rise, it is an indication that they are not breathing. In this situation, you should immediately begin CPR. CPR, or cardiopulmonary resuscitation, is a life-saving technique that involves performing chest compressions to manually pump blood through the heart and into the circulation. By applying pressure to the sternum in the area between the lines at T4 and T9, you can compress the heart enough to push blood into the pulmonary and systemic circuits. CPR should be performed at a rate of 100 compressions per minute, with a compression depth of at least 5 cm deep. It is essential to perform high-quality chest compressions until medical help arrives or the victim starts breathing on their own.