BACKGROUND Iranian people celebrate the last Wednesday eve of the year as Chaharshanbe Suri and use explosives and firecrackers as part of this festival. OBJECTIVES This study concerned fireworks injuries related to the Chaharshanbe Suri festival in Tabriz, a provincial capital in East Azerbaijan, Iran, to evaluate the epidemiology and provide data to prevent and manage these accidents. PAT...

A 79 year old female presents for evaluation of multiple episodes of witnessed syncope. Invasive electrophysiologic evaluation revealed evidence of both intrahissian Wenckebach and anisotropy. This is the first report documenting both phenomena in the same patient. The patient underwent a dual-chamber pacemaker implantation without complication.

SUMMARY Experimental studies were carried out in animals with intracellular and extracellular electrodes used to record simultanieously from the atrium, atrioventricular (A-V) node, bundle of His, bundle branches, Purkinje fibers, and ventricles to deteimine the site of conduction delay and block in Mobitz type II second-degree heart block. Type II block with block occurring within the His-Purk...

The interest in indoor service robots is increasing day by day. Depending on the specific application, an array of issues and problems must be dealt with in order to obtain a stable and satisfactory behavior. A major problem that applies to all types of service robots (and robots in general) is concerning the navigation. Two ingredients are necessary in order to achieve navigation; a map of the...

Periodic orbits in an arbitrary 2nd degree and order uniformly rotating gravity field are studied. We investigate the four equilibrium points in this gravity field. We see that close relation exists between the stability of these equilibria and the existence and stability of their nearby periodic orbits. We check the periodic orbits with non-zero periods. In our searching procedure for these pe...

Let A be a hermitian matrix of order n, and b a known vector in n C . The problem is to determine which vectors make 0(x) = (x-b)H A(x-b) a maximum or minimum on the unit sphere U = [x H : xx= 13 l The problem is reduced to the determination of a finite point set, the spectrum of (A,b). The theory reduces to the usual theory of hermitian forms when b = 0. 1* Reproduction in Whole or in Part is ...

Of 67 patients with reciprocal atrioventricular (A-V) nodal tachycardia consecutively studied by programmed electrical stimulation of the heart, nine patients showed second degree block toward the ventricle and one patient toward the atrium during tachycardia. In four patients the occurrence of block was critically related to the prematurity of the test stimulus initiating the tachycardia. In t...

Pseudo 2:1 AV block when sinus intervals are shorter than the ventricular refractory period has been reported with long QT syndrome (LQTS). We report the characteristics and treatment of a patient suffering from congenital LQTS with episodes of true 2:1 AV block. The pseudo 2:1 AV block relates to the extreme prolongation of ventricular refractoriness. Several histologic studies have documented...

The paper is concerned with the solution of nonlinear ill-posed problems by methods that utilise the second derivative. A general predictor{corrector approach is developed; one which avoids solving quadratic equations during the iteration process. Combining regularisation of each iteration step with an adequate stopping condition leads to a general regularisation scheme for nonlinear equations....

Concealed AV junctional extrasystoles are described which, conducted in a restrograde manner to the sinoatrial junction, interfere with sinus impulses, thus simulating a second-degree, 2:1, sinoatrial block.