Septal accessory pathways provide the invasive electrophysiologist with serious challenges, particularly in the case of para-Hisian or mid-septal insertion sites. Although radiofrequency energy has demonstrated efficacy in the elimination of accessory AV pathway conduction, it has also been associated with a non-trivial risk of heart block at septal and para-Hisian sites. Because of these conce...

The ECG shows clearly visible P waves only in lead V1 (Fig. 1). Regular PP intervals and an isoelectric baseline are present between the P waves, so the diagnosis is atrial tachycardia [1]. During the ECG recording, lead V1 shows 12 P waves but some of these are not visible because they are concealed by the QRS complex (Fig. 2). In lead V1, the beats following the long RR intervals are conducte...

Introduction Epicardial mapping revealed the existence of abnormal potentials on the right ventricular outflow tract (RVOT) in patients with Brugada syndrome. It is reported that tissues of the RVOT epicardium from open-chest biopsy and autopsy showed the existence of fibrosis and fatty infiltration associated with increased interstitial collagen and decreased connexin 43. Although the abnormal...

The phenomenon of multiple myocardial contractions during each single cardiac cycle, triggered by a single sinus node impulse, is the most intriguing echocardiographical topic among detectible modalities of irregular kinetics of interventricular septum. Tissue Doppler imaging based methods gave proofs of active contractions in cases presented herein. Broad spectrum of this phenomenon, which can...

Three patients with accessory nodoventricular pathways and re-entry tachycardia are reported. In all three patients the accessory nodoventricular pathway formed the anterograde limb of the re-entry circuit while the His-Purkinje-atrioventricular node axis formed the retrograde limb of the tachycardia in two of the patients and a concealed accessory pathway formed the retrograde limb in the rema...

We examined student support for a policy that would allow carrying of concealed handguns on university campuses. Large percentages of students at 2 universities expressed very low levels of comfort with the idea of permitting concealed handgun carrying on campus, suggesting that students may not welcome less restrictive policies. Students held slightly different opinions about concealed handgun...

Millimeter waves can be used to detect concealed objects because they can penetrate clothing. Therefore, millimeter wave imaging draws increasing attention in security applications for the detection of objects under clothing. In such applications, it is critical to estimate the distances from objects concealed in open spaces. In this paper, we develop a segmentation-based stereo-matching method...

coupling interval, and the "rule of multiples." Saishin-Igaku 15: 1865, 1960 2. Schamroth L, Marriott JHL: Intermittent ventricular parasystole with observations on its relationship to extrasystolic bigeminy. Am J Cardiol 7: 799, 1961 3. Schamroth L, Marriott HJL: Concealed ventricular extrasystoles. Circulation 27: 1043, 1963 4. Schamroth L: The physiological basis of ectopic ventricular rhyth...