Psychology is the main training content of emergency personnel. From the topic: which of the following is not the main training content of emergency personnel, pre-hospital first aid technology, first aid cardiopulmonary resuscitation, cardiac catheterization technology, psychology, the answer is cardiac catheterization technology. Cardiac catheterization, that is, the technique of inserting a catheter from peripheral blood vessels and sending it into the heart cavity and great blood vessels, is used to obtain information, achieve the purpose of examination and diagnosis, and can also carry out some treatment measures. Catheters can be sent to the right side of the heart and pulmonary artery, or to the left side of the heart and aorta, and can also be injected with contrast media or used for clinical electrophysiological research.