Clinical Unipolar Electrocardiography

Unipolar electrocardiography in pulmonary stenosis.

Congenital pulmonary stenosis with intact ventricular septum is a relatively common malformation of the heart. The stenosis varies from almost complete obliteration to a minimal decrease in the diameter of the orifice. The stenosis is usually of the valve, but it may be either of the infundibulum or of the lower bulbar orifice. The atrial septum may be complete, imperfectly developed, or it may...

ABC of clinical electrocardiography: Paediatric electrocardiography.

Clinical Fetal Electrocardiography *

Interest in clinical fetal electrocardiography dates back to 1906 when Cremer4 published two tracings apparently showing fetal deflections of about 0.5 mm. amplitude superimposed on the maternal electrocardiogram of a nine-months gravid woman. The records were obtained with a string galvanometer electrocardiograph with one lead on the abdomen and one in the vagina. During the next 25 years Foa7...

Chest Leads in Clinical Electrocardiography.

In a previous communication Sorsky and Wood (1937) presented the normal appearances of chest lead electrocardiograms, paying particular attention to normal variations and to the position of the proximal electrode. As the question of standardizing the technique for chest leads was then under consideration by the Cardiac Society of Great Britain and Ireland and the American Heart Association, fur...

ABC of clinical electrocardiography: Atrial arrhythmias.

In adults a tachycardia is any heart rate greater than 100 beats per minute. Supraventricular tachycardias may be divided into two distinct groups depending on whether they arise from the atria or the atrioventricular junction. This article will consider those arising from the atria: sinus tachycardia, atrial fibrillation, atrial flutter, and atrial tachycardia. Tachycardias arising from re-ent...