We examined the reflex change in refractory period (RP) of the left ventricle produced by stimulation of the central end of the caudovagal nerve (CVS). RP was recorded in the region of distribution of the left anterior descending coronary artery. During the determination of RP, hearts were paced at cycle lengths between 244 and 315 msec. Initially, the tonic effects of removing vagal and sympat...

A 52-year-old woman underwent an electrophysiologic prtKedure because of a 30-year history of recurrent episodes of paroxysmal tachycardia. The baseline sinus cycle length wa.s 600 msec and the QRS complexes had a left bundle branch block configuration, with a QRS duration of 120 msec. The atrial-His (AH) and His-ventricular (HV) intervals were 90 and 20 msec, respectively. Programmed atrial st...

A 48-year-old woman underwent an electrophysiologic procedure because of a 20-year history of paroxysmal supraventricular tachycardia. In the baseline stale, the sinus cycle length was 720 msec, the atrial-His (AH) and His-ventricular (HV) intervals were 110 and 50 msec, respectively, and tachycardia was not inducible by atrial or ventricular pacing. During infusion of 1 /zg/min of isoprotereno...

In this paper we introduce a new image model called MSEC (Multi-Scale Edge Compensation) and implement an image compression system based on MSEC. MSEC consists of semantically meaningful components including edges of diierent types and scales, and the background. The MSEC-based image coding technique permits some image analysis operations such as edge detection, enhancement, and content-based r...

hydatid cyst is an important endemic zoonosis in iran. it may be seen in various organs of body. musculoskeletal system is rarely involved by hydatid cyst, the larval form of echinococcus granulosus . on clinical basis, it may resemble any soft tissue tu-mor. a 70-years old housewife living in ardoghesh, a village in neyshabur, north-east iran, was admitted to general surgery clinic because of ...

the main purpose of this paper is to introduce and study new classes of soft closed sets like soft regular generalized b-closed sets in soft topological spaces (brie y soft rgb-closed set) moreover, soft rg-closed, soft gpr-closed, soft gb-closed, soft gsp-closed, soft g-closed, soft gb-closed, and soft sgb-closed sets in soft topological spaces are introduced in this paper and we investigat...

Contingent negative variation (CNV) is a slow negative cortical potential shift, which occurs during a warned foreperiod reaction time paradigm. Most studies of evoked potentials have concentrated on components occurring during the first 300 msec, although there are important and recordable aspects of signal processing occurring well beyond 300 msec e.g. late negative slow wave. CNV has proven ...

OBJECTIVES To study and quantify the effects of rear-end collision on the lumbar spine. DESIGN The lumbar spine of a cadaver was instrumented with rosette strain gauges applied on the lateral and anterior surfaces of T12, L2, and L4. Biaxial accelerometers were mounted on L1, L3, and L5. The cadaver was seated, restrained, and subjected to rear impacts of 5g and 8g. RESULTS The anterior she...