BACKGROUND: Clinical studies have discovered heart rate variability (HRV) is closely correlated with autonomic nervous system, sub-health and sudden death. Medical studies have summarized some chaotic medical science and homeostasis relevance theory. But so far the combination could still not systematically explain the clinical manifestation or summarize the diagnostic standards for sub-health and effective index to prevent sudden death. OBJECTIVE: To elucidate the correlation among autonomic nervous system, sub-health and sudden death by using chaotic medicine and homeostasis, so as to provide theoretical basis for evaluating sub-healthy state using HRV and preventing sudden death HRV. RETRIEVAL STRATEGY: A computer-based online search of Pubmed was undertaken to identify the articles published in English between January 1995 and June 2007 with the keywords of "chaotic medicine, heart rate variability (HRV), Sudden death, Sub-health, homeostasis". Meanwhile, the Weblog and CNKI database were searched for relevant articles dated from January 1995 and June 2007 with the same keywords in Chinese. Fifty-six papers were searched. After the first trial, only articles ①closely correlated with chaotic medical science, sudden death and sub-health, and ②published recently or in authority magazine in same field were selected. Repetitive studies were excluded. LITERATURE EVALUATION: The review articles, basic and clinical experiments about chaotic medical science, HRV, sudden death, sub-health, and homeostasis as well as articles published in related weblogs were selected. DATA SYNTHESIS: ①In any individual composed of multi-cells and multi-system, there are at least three-level chaotic system: overall chaotic system, cardiovascular chaotic system maintaining the blood pressure and cell chaotic system. Healthy state is that the three chaotic systems are in normal condition. Disease and sub-healthy state is the sub-stable state of chaotic system caused by the overstress of central nervous system, overexcitation of autonomic nerves and HRV decrease when there is some cell or cardiovascular system malfunction, and the information is feedback to central nervous system. ②Based on the theory about chaotic medicine and homeostasis, there are four states in individual chaotic motion: health, disease, sub-health, and homeostasis border before sudden death. The health is the homeostasis of body; disease and sub-health are the sub-homeostasis and may develop from healthy state because various factors; they may transform each other and both of them may lead to sudden death for unsteady. ③The extreme tension of central nervous system and over-excitation of autonomic nerves result in the destabilizing overall chaotic motion. Stimulation induces system destabilizing and sudden death because the patient cannot maintain arterial blood pressure. CONCLUSION: Long-term healthy state is unpredictable, but we can forecast 1-2 days situations by short-term HRV testing for 512 times in the early morning of every day, and judge the healthy state after sleep, and the change tendency of healthy state. Accordingly, we could predict person is in healthy state, sub-healthy state or unsteady border state that could cause sudden death.

Humans ; Melanoma/therapy* ; Immunotherapy ; Syndrome ; Skin Neoplasms