Effect of atrial systole on right ventricular stroke output in complete heart block.

Influence of Atrial Systole on Effective Ventricular Stroke Volume.

Hyperkalemia-induced complete heart block

Background: Potassium, as an extracellular ion, plays an important role in the electrophysiologic function of the myocardium and any change in extracellular concentration of this ion might have a marked impression upon myocyte electrophysiologic gain. High serum potassium levels are thought to impair pulse conduction in Purkinje fibers and ventricles more than that in the Atrio...

Effect of decreasing the force of right atrial contraction on right ventricular stroke volume.

Atrial flutter with complete heart block.

The association of atrial flutter and complete heart block is very uncommon. Amongst 168 cases of atrial flutter described by Willius (1927) only one had complete heart block, and in a review of 20,000 electrocardiograms Di Gregorio and Crawford (1939) found the combined dysrhythmia only twice. Campbell (1944) in his analysis of 64 cases of heart block does not mention the association, and of t...

Complete heart block in a case of idiopathic hypertrophic subaortic stenosis: noninvasive correlates with the timing of atrial systole.

A young man with IHSS who developed complete heart block was successfully treated with a permanent pacemaker. Echocardiography and other noninvasive techniques showed marked cycle-to-cycle variation in the evidence of subvalvular obstruction which decreased markedly when atrial systole preceded the ensuing paced complex by an appropriate interval. Because cycle length and therefore afterload we...