Analysis of sino-atrial conduction in man using premature atrial stimulation.

Cardiovascular Research
G MasiniA Graziina

Abstract

Sino-atrial conduction was investigated using premature atrial depolarization in 25 patients seven of whom had sino-atrial block. The results obtained in this investigation were evaluated plotting the test cycle (expressed as difference between the basic sinus cycle and the test cycle as a percentage of the basic sinus cycle) as a function of the return cycle (expressed as difference between the return cycle and the basic cycle as a percentage of the basic sinus cycle). In normal subjects, premature atrial depolarizations elicited in the last 10-20% of the spontaneous sinus cycle, produced a progressive prolongation of the return cycle and the points correlating the return cycle index to the test cycle index fell above the diagonal of the plotting system. After earlier premature atrial depolarizations, the return cycle remained of the same length, and the points correlating the return cycle index to the test cycle index fell along a line parallel to the y-axis ('plateau'). The mean value of the returning cycles (as expressed above) corresponding to the test cycles (as evaluated above) included in the first 5% of the 'plateau' can be defined as 'the sino-atrial conduction index'. This index, the sum of conduction into and out of...Continue Reading

Citations

Sep 1, 2005·Pediatric Cardiology·S Sanjeev, P P Karpawich
Jan 1, 1979·Journal of Electrocardiology·M M ScheinmanJ A Abbott
Jul 1, 1984·Pacing and Clinical Electrophysiology : PACE·A M Tonkin, W F Heddle
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