PMID: 1205040Jan 1, 1975Paper

Programmed atrial stimulation in the study of sinoatrial conduction in normal subjects (author's transl)

Giornale italiano di cardiologia
G MasiniA Graziina

Abstract

Sinoatrial conduction was investigated in 18 normal subjects, using premature atrial depolarizations. 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 stimulations, the return cycle stayed the same length, and the points correlating the return cycle index to the test cycle index fell along a line parallel to "y" axis (plateau). The mean value of the returning cycle (expressed as above) corresponding to the test cycles (evaluated as above) included in the first 5% of the "plateau" can be defined as the "sinoatrial conduction index". This index, the sum of conduction into and out of the sinus node, ranged from 79 msec to 18...Continue Reading

Related Concepts

Related Feeds

Atrial Filbrillation

Atrial fibrillation refers to the abnormal heart rhythm characterized by rapid and irregular beating of the atria. Here is the latest research.

Cardiac Conduction System

The cardiac conduction system is a specialized tract of myocardial cells responsible for maintaining normal cardiac rhythm. Discover the latest research on the cardiac conduction system here.

Atrial Fibrillation

Atrial fibrillation is a common arrhythmia that is associated with substantial morbidity and mortality, particularly due to stroke and thromboembolism. Here is the latest research.

Arrhythmia

Arrhythmias are abnormalities in heart rhythms, which can be either too fast or too slow. They can result from abnormalities of the initiation of an impulse or impulse conduction or a combination of both. Here is the latest research on arrhythmias.