Abstract: His bundle electrograms of 26 rabbit hearts in situ were statically analysed. The results are as follows. P-A, A-H, H-V intervals and the duration of the H wave were 11±7, 36±6, 20±3 and 7±3 msec respec-tively. By comparing the percentage of each component in P-R interval of the rabbit with that of the corresponding one of man, it was found that both the A-H intervals as well as the H-V intervals accounted for very similar proportion.

Key words: His bundle electrogram, A-V conduction, electrode catheter