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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 2 (1989), S. 0 
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 3 (1989), S. 0 
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study determined the effects of a wide range of basic drive cycle lengths on the induction of ventricular tachycardia (VT) by a single extrastimulus (S2). Seventy-one patients with coronary artery disease and inducible sustained monomorphic VT underwent 121 electrophysiology tests either in the control state or during treatment with an antiarrhythmic drug. Ventricular basic drive trains were eight beats in duration and the intertrain interval was three seconds. Programmed ventricular stimulation was performed with S2 using the longest possible basic drive cycle length rounded off to the nearest multiple of 100 msec, then using basic drive train cycle lengths that decreased in 100 msec steps to 400 msec, and finally using a basic drive cycle length of 350 msec. At each drive cycle length, an interval of 〉 50 msec beyond the effective refractory period (ERP) was scanned with S2. Monomorphic VT was induced by S2 in 52/121 studies (43%). The drive cycle length had a significant linear effect on the log odds of inducing VT (P 〈 0.0001). The highest yield of VT occurred with a drive cycle length of 350 msec (42/121, 34%), and with each increment in drive cycle length, the expected odds of inducing VT decreased by a factor of 1.7. In 88% of cases in which VT was induced at a particular drive cycle length but not at longer drive cycle lengths, the coupling intervals that induced VT exceeded the ERP measured at one or more of the longer basic drive cycle lengths. In conclusion, there is an inverse relationship between the basic drive cycle length and the yield of monomorphic VT induced by S2. The use of shorter basic drive cycle lengths often facilitates the induction of VT by some effect other than critical shortening of the S2 coupling interval.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1615-2573
    Keywords: Wolff-Parkinson-White ; Surgery ; Supraventricular tachycardia ; Sudden death ; Electrophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The Wolff-Parkinson-White syndrome, as originally described, includes palpitations, tachycardia, and an abnormal electrocardiogram (short PR interval and wide QRS complex). The clinical manifestations are dependent upon a reentrant tachycardia supported by an accessory connection bridging the atrioventricular junction and frequently appear during the first two decades of life. Palpitations are the usual symptoms; less frequently, severe symptoms, such as syncope and sudden death, may result from very rapid atrioventricular conduction across the accessory connection during atrial fibrillation. We report the surgical management of 30 young patients with this syndrome, including 6 with life-threatening tachycardia. Surgical interruption of the accessory connection(s) was curative in 90% (27/30) of the patients; life-threatening symptoms were eliminated in the other three. Based on the limited knowledge of the natural history of the Wolff-Parkinson-White syndrome, the individual patient symptoms, and the electrophysiologic properties of each patient's accessory pathway(s), an algorithm is presented outlining the treatment options. This experience strongly suggests that surgical treatment of the Wolff-Parkinson-White syndrome is safe, effective, and possibly the preferred treatment for this disorder in selected young symptomatic patients.
    Type of Medium: Electronic Resource
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