A firm base is needed for chest compressions to enable the depth and ratio of the compressions to be effective. If we do not have a firm base then we would lose some of the power needed into the ground below.
You must find a firm base to do compressions for CPR. Without a firm base, the compressions are not effective. Hence, for example, you can't do CPR in the water. Use any materials around for a firm base such as a plywood.
Chest compressions is the manual way to pump blood around the body, for example once rescue breaths have been given this means there is oxygen in the blood, and the only way to pump that oxygen around is through the use of chest compressions.
CPR is used in one situation - when the heart has stopped. The purpose of the compressions is to become that persons artificial heart until an AED (automated external defibrillator) arrives. The compressions circulate the blood in the person's body as to keep the brain alive. The two breaths oxygenate the victims breath.
Chest compressions push on the heart, which circulates the blood.
You must find a firm base to do compressions for CPR. Without a firm base, the compressions are not effective. Hence, for example, you can't do CPR in the water. Use any materials around for a firm base such as a plywood.
A hard surface is required for CPR to effectively compress the sternum against the spine to compress the heart. Any hard surface will do, such as a backboard or wide plank.
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The trachea runs from the throat (in the the head) down the neck to the lungs (chest). It is the firm tube you can feel in the midline of your neck.