The effect of lidocaine (n = 6) and procainamide (n = 12) on electrogram characteristics from electrically normal right ventricular and electrically abnormal left ventricular endocardial sites was determined in 18 patients with prior myocardial infarction. Bipolar electrograms were recorded during sinus rhythm with No. 6F catheters positioned at a left ventricular abnormal site (electrograms fu...

PURPOSE Intramyocardial hemorrhage and area at risk are both prognostic markers in acute myocardial infarction (AMI). Myocardial T2 and T2 * mapping have been used to detect such tissue changes at 1.5T but these techniques are challenging at 3.0T due to additional susceptibility variation. We studied T2 and T2 * myocardial mapping techniques at 3.0T on a system employing B1 shimming and compare...

Avian song learning is an important model system for understanding vocal learning in humans and other animals. Laboratory studies indicate that social interactions are critical for song learning, but field observations show that territorial males are aggressive to intruders, raising the question of whether young birds are tolerated, much less tutored in the wild. We examined how adult song spar...

We describe a basic Geo-coding service encompassing a geo-parsing tool and integrated digital gazetteer service. The development of a geo-parser comes from the need to explicitly georeference large resource collections such as the Statistical Accounts of Scotland which currently only contain implicit georeferences in the form of placennames thus making such collections inherently geographically...

Background: The goal was to use surface electrocardiographic (ECG) indicators detect COVID-19's malignant arrhythmic potential.
 Methodology: In 51 COVID-19 patients and 40 control subjects, the ECG parameters PR, QT, QTc, QTd, TPe, Tpe/QTc were assessed. had substantially higher mean QTc (410.8 24.3 msec vs. 394.6 20.3 msec, p.001), (0.19 0.02 0.18 0.04, p =.036), median QTd (47.52 46.5) ...

A 65-year-old woman underwent an electrophysiologic procedure because of a 20-year history of paroxysmal supraventricular tachycardia. The baseline sinus cycle length was 800 msec, with an atrial-His interval (AH) of 100 msec and a His-ventricular interval (HV) of 40 msec. There was evidence of dual AV nodal pathways, but no inducible tachycardia. During infusion of isoproterenol, the sinus cyc...

in this work, we define a fuzzy soft set theory and its related properties. we then define fuzzy soft aggregation operator that allows constructing more efficient decision making method. finally, we give an example which shows that the method can be successfully applied to many problems that contain uncertainties.

The effect of digoxin on atrioventricular (A-V) conduction-was compared in five patients with an intact cardiac autonomic nervous system (Group I) and seven patients who had undergone cardiac transplantation (Group II), in whom we have previously shown the transplanted heart to be completely denervated.Small decreases in the atrial effective refractory period (ERP) (from 262 ± 12 to 254 ± 11 ms...

BACKGROUND This study was performed to evaluate when patients recover sufficiently to drive an automobile after operative repair of various other lower extremity fractures. METHODS A computerized driving simulator was developed and tested. Three groups of individuals were compared: (1) 12 healthy, volunteers tested once to establish normal mean values for variables tested (group I); (2) 22 pa...

BACKGROUND Although the electrophysiological mechanisms underlying self-sustaining atrial fibrillation (AF) are unclear, recent studies suggest that one requirement for reentry, slow conduction, is frequently present in patients with AF. However, these observations limited to paroxysmal AF may not necessarily apply to chronic AF. Therefore, electrophysiological properties of the atrium and sinu...