Final answer:
If the chest does not rise during CPR after the first breath, you should re-tilt the head and attempt another breath. Proper CPR technique involves applying pressure to the sternum between T4 and T9 for chest compressions and ensuring the airway is open for ventilations. Training is significant to avoid additional harm to the patient.
Step-by-step explanation:
When delivering ventilations during CPR, if the chest does not rise after the first breath, the correct action to take is C) Re-tilt the head and attempt another breath. If the initial breath does not cause the chest to rise, it may indicate that the airway is not properly opened or there may be an obstruction. Increasing the force of the breath (A) could damage the lungs, checking for a pulse (B) is not immediately necessary if you have already established that there is no breathing or pulse which prompted CPR, and resuming chest compressions (D) should be done after attempting two ventilations unless you are alone and need to call for help or the scenario dictates otherwise.
Cardiopulmonary Resuscitation (CPR) is a life-saving technique used when someone's breathing or heartbeat has stopped. It is critical that compressions are done correctly, applying pressure between the T4 and T9 vertebrae. Proper training in CPR, which is offered at many institutions like colleges and through organizations such as the American Red Cross, is essential to avoid causing further injury to the patient.