The past experiment showed that there was a specific change of H+ concentration in Neiguan (PC6) of the rabbit suffering from arrhythmia induced by aconitine. When arrhythmia appeared

th ecocentration of H+ in Neiguan (PC 6) increase4 obviously. The authors found that it happened not only in the regular points but also along the course of the Heart Meridian and Pericardium Meridian in the furthe study and research. This may mean that on the course of the corresponding meridian there is a specific change of H+ concentration when the Zang-fu organs are in dysfunctional. But the mechanism and biological significance of the change of H+ concentration should remain to be further studied