In this book we try to introduce Generalities and Essentials of Cardiac Emergencies in Children and Adults Based on Radiology Tips for students and all people that they interest for this matter. The cardiovascular system includes the heart and blood vessels. Providing mechanical energy for blood circulation throughout the body is the duty of the heart. The heart is a cyclic pump and also a blood storage tank in the cardiovascular system, and familiarity with its function depends on knowing the structure of the heart. The knowledge that can be used to discuss the two-way relationship between the structure of different parts of the heart and the observed physical phenomena is obtained through heart modeling. This knowledge has unique applications in biomedical research in advanced education and improvement of pharmaceutical sciences, and also has important effects in sciences related to the physiological behavior of the heart. Heart modeling is done in two ways: mathematical and physical. Animal hearts are usually used in clinical research, and the results are considered as a reference. Mathematical models are used in numerical simulations that are performed by computers.