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心脏传导的改变导致折返。这样的过程常常是由于疾病所致的心脏细胞电活动改变的结果,然而由折返引起的心律失常在没有疾病的时候也可能出现。什么是折返由窦房结起搏点激动心脏时,传导的冲动依次激动心房和心室之后消失,因为心脏由刚兴奋过的不应期组织所包围。当传导的冲动在心脏完全激动之后不消失,而且持续到不应期终了之后再兴奋它的时候就会产生折返现象。这些折返机理是由Mayer在1908年的兴奋水母下伞面组织环的研究和Mine在1912—1914的切割乌龟
Changes in heart conduction lead to reentry. Such processes are often the result of changes in electrical activity of the heart cells caused by the disease, however arrhythmias caused by the reentry may occur when there is no disease. What is the reentry from the sinus node pacemaker excite the heart, the conduction of the impulse in turn atrial and ventricular activation after the disappearance of heart, because the heart is surrounded by the excitement of the refractory tissue. When the conduction of the impulse in the heart is not completely disappeared after the excitement, and continued until it should not be the end of the excitement when it will produce reentry. These reentry mechanisms were studied by Mayer in 1908 under the excitement of the study of the canopies of jellyfish rings and the cutting of turtles by the Mine in 1912-1914