It is a well known fact that the A H time (i.e. the time needed for the impulse to pass the AV node) undergoes a frequency dependent prolongation if the atrium is stimulated with rising frequencies. Apart from this general statement, up to now there has been no information on the detailed chronological course, in which the intranodal conduction time adapts itself to a new frequency. To study this problem, the authors carried out A H time determinations on 30 patients with normal P Q interval. In these patients, the atrium was stimulated with frequencies of 100 and 120, over a period of 2 and 5 min, respectively. The determination of the A H times from beat to beat led to the distinction of 2 kinds of A H time relationships.
|Title of host publication||Verhandlungen der Deutschen Gesellschaft fur Kreislaufforschung|
|Number of pages||7|
|State||Published - Dec 1 1973|
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