IT is welcome to see a fourth edition of this useful textbook for students. The authors are to be congratulated on bringing out a further edition without notably increasing the length of this book, although their efforts to condense their material do lead to some difficulty. For example, on page 92, the 13 lines devoted to the natural history of breast cancer would almost certainly lead the stu...

In the normal heart, an insulating barrier separates the atria and ventricles. The only way in which electrical impulses can cross this barrier is via the atrioventricular (AV) node, which delays impulse conduction to ensure the forward flow of the blood. However, in some individuals, additional muscular bundles (accessory pathways) allow rapid conduction of electrical impulses from the atria t...

Radiofrequency catheter ablation of accessory pathways and the atrioventricular junction often requires multiple applications of energy. The inability to determine the effects of any given application on the underlying tissue may contribute to this problem. In the present study, impedance was monitored in 20 patients undergoing radiofrequency catheter ablation, and the relationship between an i...

Five patients with medically refractory incessant supraventricular tachycardia due to a posterior septal, slowly conducting accessory connection underwent transcatheter closed chest ablative treatment. The tachycardia characteristics were consistent with the permanent form of junctional reciprocating tachycardia. In each patient the ablative attempts resulted in independent interruption of eith...

conduction and circus movement tachycardias in patients with Wolff-Parkinson-White syndrome. Circulation 47: 1229, 1973 31. Sellors TK, Bashore TM, Gallagher JJ: Digitalis in the preexcitation syndrome. Analysis during atrial fibrillation. Circulation 56: 260, 1977 32. De la Fuente D, Sasyniuk B, Moe GK: Conduction through a narrow isthmus in isolated canine atrial tissue. A model of the WPW sy...

the detailed anatomy and histology of the atrioventricular bundle (avb) was studied in 10 adult cats (5 males and 5 females). the trunk of the atrioventricular bundle was a direct continuation of the atrioventricular node (avn) with no sharp line of demarcation between node and the bundle. the avb of the male cats measured 6.24 mm in length, 0.27 mm in width and 0.65 mm in thickness, while in t...

BACKGROUND The management of Wolff-Parkinson-White is based on the distinction between asymptomatic and symptomatic presentations, but evidence is limited in the asymptomatic population. METHODS AND RESULTS The Wolff-Parkinson-White registry was an 8-year prospective study of either symptomatic or asymptomatic Wolff-Parkinson-White patients referred to our Arrhythmology Department for evaluat...

BACKGROUND Reentrant tachycardias associated with Mahaim pathways are rare but potentially troublesome. Various electrophysiological substrates have been postulated and catheter ablation at several sites has been described. OBJECTIVE To assess the efficacy and feasibility of targeting discrete Mahaim potentials recorded on the tricuspid annulus for the delivery of radiofrequency energy in the...

The purpose of this study was the long-term evaluation of a method of surgically repairing the abnormal condition of accessory teat and gland cistern complexes in dairy cattle. A prospective evaluation of three cows that had undergone the procedure was done. These cows were evaluated from four months to one year, postoperatively. A thorough history, physical examination, contrast radiography, a...

We have studied 135 patients with the pre-excitation syndrome and have demonstrated evidence of multiple accessory pathways in 20 patients. Five patients had two distinct accessory atrioventricular (A-V) connections, associated with enhanced A-V node conduction in one patient. Twelve patients had a single accessory A-V connection associated with enhanced A-V conduction. In one of these there wa...