In pathological death, the diseases of circulatory systems hold the first place, and in non-pathological death, the suddenness of a cerebral blood vessel holds the first place.
病理性死亡原因中循环系统疾病居首位，非病理性死亡原因中脑血管意外居首位；
2
If combined with a "non-pathological" ECG, and a convincing lack of clinical and family history, echocardiography can act as a powerful tool in distinguishing pathology from physiology.
The signal of brain activity is a non-stationary random signal including lots of physiology and disease information, which is of important action for doctors to judge pathological changes in brain.