It would be a problem if the hand was placed at any lower part of the sternum because the compression the person is giving could break the xiphoid process of the sternum. This could cause a break and drive the sternum into the heart, liver, and possibly the diaphragm. This could have fatal consequences.
Further Explanation:
it is very important that the person performing CPR is trained in the technique. The compressions must be done precisely with the heel of the hand placed between the nipples, many use an imaginary line that is direct center of chest between breasts.
When the hands are placed wrong, a puncture could occur and the patient could die from the compressions and not from the cause of the incident they had. the emergency number to the police needs to be called asap before starting CPR. Many times the 911 operator will walk someone that has no training through the procedure.
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