MYOCARDIUM was one of the first tissues to be studied with the electron microscope, but the ultrastructure of the cardiac conduction system has heretofore been described only in subhuman species. Electron microscopy has been employed to examine the conduction system of the dog,'rabbit,5' 6 frog,7 sheep8,9 rat'O, 11 and steer.'2 13 Interest in the specialized tissue of the heart which comprises ...

Disturbances of the cardiac conduction system causing reentry mechanisms above atrioventricular (AV) node are induced by at least one accessory pathway with different conducting properties and refractory periods. This work aims to further develop already existing continuously expanding Offenburg heart rhythm model visualise most common supraventricular tachycardias provide a better understandin...

Lyme disease is an infectious disease caused by the bacterium Borrelia burgdorferi. When untreated, infection may spread to the heart, nervous system, and joints. Cardiac involvement usually manifests as abnormalities of the conduction system and bradycardia. Treatment of Lyme disease is generally effective, with a subset of patients experiencing persistent, sometimes long-term symptoms called ...

In congenital cardiac surgery, intracardiac repair procedures like ventricular septal defect (VSD), atrioventricular and tetralogy of fallot (TOF) are associated with conduction system injury. Fewer cases reported describing life threatening complication late post-operative complete heart block. We reporting 2 patients who presented block after managed by permanent pacemaker placement in AFIC C...

The effects of glucagon, 50 |iig/kg, on atrioventricular (A-V) conduction and ventricular automaticity were studied in 14 dogs. Atrial pacing was used to control the heart rate. The His bundle electrogram was recorded, and the interval from the pacing impulse (P) to the His bundle spike (H), the P-H interval, was used as a measure of A-V conduction. Ventricular automaticity was estimated in fou...