Electrical stimulation of the heart in the study and by Hein J. J. Wellens

By Hein J. J. Wellens

The interaction among the cautious research of scientific electrocardiograms and effects from animal experiments have long ago 60 years ended in provo­ cative and brill ant suggestions at the mechanisms of cardiac arrhythmias in guy. the various animal experiments notwithstanding have been performed on open-chested canine with minimize cardiac nerves and lower than the impact of pharmaca. it truly is uncertain, for this reason no matter if those effects could be transferred with no reser­ vation to the human scenario. The advent of electric stimulation of the center in medical cardiology has opened new how you can learn a few points of cardiac arrhythmias without delay within the unaesthesized sufferer. This learn reviews observations on sufferers who have been admitted to the collage division of Cardiology, Wilhelmina Gasthuis, Amsterdam, for the review and remedy of tachycardias. Electrically caused untimely beats have been utilized in an attempt to clarify the foundation and mechanism of those tachycardias. the 1st bankruptcy is on category and prognosis of tachy­ cardias with specific emphasis on our present wisdom of the differential prognosis among supraventricular tachycardias with aberrant conduction and ventricular tachycardias. this is often through theoretical concerns on tachycardias in particular on the subject of the equipment utilized in this research. After an overview of those equipment the result of our experiences in sufferers with atrial flutter, A-V junc­ tional tachycardias and tachycardias relating to the pre-excitation syndrome are said. A dialogue at the price of electric stimulation for the therapy of tachycardias is via a precis of our effects.

Show description

Read Online or Download Electrical stimulation of the heart in the study and treatment of tachycardias PDF

Similar cardiology books

Cardiology Essentials in Clinical Practice

This e-book addresses the total cardiological pathology, and accompanies the reader via every one major situation, from occurrence and severity, to mechanisms, scientific and lab prognosis, and as much as therapy and analysis. The presentation is better by way of quite a few tables and figures, to higher illustrate the similarities and changes among the mentioned entities.

Handbook of Cardiovascular CT: Essentials for Clinical Practice

'Handbook of Cardiac CT' is a primer for the sensible functionality and interpretation of cardiovascular computed tomography. This guide serves as a spouse to the textbook: 'Cardiac CT Imaging: prognosis of Cardiovascular Disease' and offers crucial concise and functional textual content precis of every subject, with extra tables, algorithms, protocols and key pictures for orientation to and familiarization with vital disorder methods.

Vascular Surgery

Vascular surgical procedure is a necessary reduction for applicants sitting surgical procedure examinations who want a functional figuring out of vascular surgical procedure. Edited by way of favourite vascular surgeons within the united states and united kingdom, the publication tackles the epidemiology and etiology of atherosclerosis and the way to guage sufferers with vascular illness.

Complications in Cardiothoracic Surgery: Avoidance and Treatment

Drs. Little and Merrill draw on their services commonly thoracic and cardiac surgical procedure to check tracheobronchial operations, lung quantity aid operations, lung transplantation, minimally invasive esophagectomy, pleural operations, revascularizations, myocardial operations, and aortic and nice vessel operations.

Extra resources for Electrical stimulation of the heart in the study and treatment of tachycardias

Sample text

The smallest complexes were recorded in patients with the smallest atria. The intervals between 'flutter' complexes as measured from the intra-atrial recordings were not completely regular. Differences of 5-10 msec. were seen. This may be largely due to changing spatial relations between the atria and the catheter, under the influence of the movements of the heart. 1I dela y ex tra ill -----------~------------st. A. ~ l 1. v;;;-{v 2;--lr;;; V- ! - I 210 msec J~ ~ V235 190 280 235 v-rdvJv vr-t - t -170 i 150 !

An 1 to 1 relation between ventricular and atrial activation. A ventricular rate between 115 and 220/minute. Activation during the tachycardia of the atria in a caudocranial direction, as recorded from intra-atrial leads. 5. 14 sec or more without signs of pre-excitation. TABLE 3 Patient Sex Age Frequency of attacks A B C D E male male female female male 47 10 61 56 62 F G female female 63 23 first attack 4 to 9 a year about 5 a year about 5 a year last year almost continuously 3 to 4 times a week last year almost continuously Time period 5 30 10 20 years years years years 2 years 5 years 41 AV JUNCTIONAL TACHYCARDIAS It is clear that these criteria do not exclude tachycardias originating low in the atrium.

I ' I I . -..... 100 msec Fig. 16. Patient D. Simultaneous registration of lead I, II. III. VI' V6 • His bundle and right atrium during an A-V junctional tachycardia. It can be seen that the QRS complex is preceded by a His bund le complex (H-V interval: 30 msec) and that the QRS complex is followed by the P wave after an interval of 50 msec. 44 AV JUNCTIONAL TACHYCARDIAS V, V6 J~~~-----1L--. B. 365 0 350 0 365 0 365 0 Fig. 17. Patient D. A right atrial premature beat given after an interval of 185 msec does not result in earlier appearance of the QRS complex immediately following this premature beat, but shortens the next R-R interval.

Download PDF sample

Rated 4.00 of 5 – based on 25 votes