Download or read book Electrical Stimulation of the Heart in the Study and Treatment of Tachycardias written by Hein J.J. Wellens and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interplay between the careful analysis of clinical electrocardiograms and results from animal experiments have in the past 60 years resulted in provo cative and brill ant concepts on the mechanisms of cardiac arrhythmias in man. Many of the animal experiments however were done on open-chested dogs with cut cardiac nerves and under the influence of pharmaca. It is doubtful, therefore whether these results can be transferred without reser vation to the human situation. The introduction of electrical stimulation of the heart in clinical cardiology has opened new ways to study some aspects of cardiac arrhythmias directly in the unaesthesized patient. This study reports observations on patients who were admitted to the University Department of Cardiology, Wilhelmina Gasthuis, Amsterdam, for the evaluation and treatment of tachycardias. Electrically induced premature beats were used in an effort to elucidate the origin and mechanism of these tachycardias. The first chapter is on classification and diagnosis of tachy cardias with special emphasis on our current knowledge of the differential diagnosis between supraventricular tachycardias with aberrant conduction and ventricular tachycardias. This is followed by theoretical considerations on tachycardias especially in relation to the methods used in this study. After an outline of these methods the results of our studies in patients with atrial flutter, A-V junc tional tachycardias and tachycardias related to the pre-excitation syndrome are reported. A discussion on the value of electrical stimulation for the treatment of tachycardias is followed by a summary of our results.

Download or read book Journal of the American Medical Association written by and published by . This book was released on 1917 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes proceedings of the association, papers read at the annual sessions, and lists of current medical literature.

Download or read book A Manual of Medical Treatment Or Clinical Therapeutics written by Isaac Burney Yeo and published by . This book was released on 1906 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Clinical Journal written by and published by . This book was released on 1903 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Manual of medical treatment or Clinical therapeutics v 2 written by Isaac Burney Yeo and published by . This book was released on 1906 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Archives of Physiological Therapy written by and published by . This book was released on 1906 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Electrical Review written by and published by . This book was released on 1894 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lectures on Massage Electricity in the Treatment of Disease written by Thomas Stretch Dowse and published by . This book was released on 1903 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Lancet written by and published by . This book was released on 1927 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book British Medical Journal written by and published by . This book was released on 1923 with total page 1742 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Medical Journal of Australia written by and published by . This book was released on 1923 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Electrical Journal written by and published by . This book was released on 1892 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Boston Medical and Surgical Journal written by and published by . This book was released on 1893 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Medical Record written by George Frederick Shrady and published by . This book was released on 1921 with total page 1198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Models and Simulations of the Electric Field in Deep Brain Stimulation written by Fabiola Alonso and published by Linköping University Electronic Press. This book was released on 2018-09-10 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deep brain stimulation (DBS) is an established surgical therapy for movement disorders such as Parkinson’s disease (PD) and essential tremor (ET). A thin electrode is implanted in a predefined area of the brain with the use of stereotactic neurosurgery. In the last few years new DBS electrodes and systems have been developed with possibilities for using more parameters for control of the stimulation volume. In this thesis, simulations using the finite element method (FEM) have been developed and used for investigation of the electric field (EF) extension around different types of DBS lead designs (symmetric, steering) and stimulation modes (voltage, current). The electrode surrounding was represented either with a homogeneous model or a patient-specific model based on individual preoperative magnetic resonance imaging (MRI). The EF was visualized and compared for different lead designs and operating modes. In Paper I, the EF was quantitatively investigated around two lead designs (3389 and 6148) simulated to operate in voltage and current mode under acute and chronic time points following implantation.Simulations showed a major impact on the EF extension between postoperative time points which may explain the clinical decisions to change the stimulation amplitude weeks after implantation. In Paper II, the simulations were expanded to include two leads having steering function (6180, Surestim1) and patient-specific FEM simulations in the zona incerta. It was found that both the heterogeneity of the tissue and the operating mode, influence the EF distribution and that equivalent contact configurations of the leads result in similar EF. The steering mode presented larger volumes in current mode when using equivalent amplitudes. Simulations comparing DBS and intraoperative stimulation test using a microelectrode recording (MER) system (Paper III), showed that several parallel MER leads and the presence of the non-active DBS contacts influence the EF distribution and that the DBS EF volume can cover, but also extend to, other anatomical areas. Paper IV introduces a method for an objective exploitation of intraoperative stimulation test data in order to identify the optimal implant position in the thalamus of the chronic DBS lead. Patient-specific EF simulations were related to the anatomy with the help of brain atlases and the clinical effects which were quantified by accelerometers. The first results indicate that the good clinical effect in ET is due to several structures around the ventral intermediate nucleus of the thalamus.

Download or read book An Index of Treatment written by Sir Robert Hutchison and published by . This book was released on 1916 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Electrical World written by and published by . This book was released on 1895 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: