1,720,973 research outputs found
[Electrocardiographic, clinical and prognostic evaluation of sustained ventricular tachycardia in acute and chronic ischemic heart disease]
No full textWe retrospectively evaluated 48 patients with sustained ventricular tachycardia (STV), in whom a 12 lead ECG had been recorded during arrhythmia, considering two groups: pts. with acute or subacute myocardial infarction (MI group = 15 pts.) and pts. with chronic post infarction ischemic heart disease (CPIIHD group = 33 pts.). The electrocardiographic patterns in the basal ECG and during SVT (16 SVT in the MI group, 40 in the CPIIHD group) as well as the in-hospital and long-term prognosis were evaluated. The two groups were comparable as far as mean age, site of acute or previous infarction, and baseline ECG parameters are concerned. QTc values greater than 440 msec were present in 64.5% of the cases. The ECG recording during SVT showed longer duration of QRS in CPIIHD group (171 +/- 39 msec) versus MI group (140 +/- 25 msec) (p less than 0.005). In comparison to basal ECG, Q waves in the SVT recording were in the same site (47.2%) or in a wider site (38.1%), rarely (10.9% of the cases) there was a discordance between the two tracings. In-hospital mortality was 40% (6/15 pts.) in MI group, related to severe hemodynamic impairment, 15.1% (5/33 pts.) in CPIIHD group. During the follow-up (mean 38.4 months) survival in CPIIHD group was 89.3% at 12 months, in MI group 88.9% at 12 months. In CPIIHD patients SVT was recurrent in 60.6% of the cases.(ABSTRACT TRUNCATED AT 250 WORDS
[Hyperkinetic ventricular arrhythmias in acute myocardial infarction: different etiopathogenetic mechanisms?]
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[Role of electrophysiologic study in the sick sinus syndrome and in carotid sinus syndrome]
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[Refractory sustained ventricular tachycardia. Electrocardiographic characterization and prognosis]
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[Paroxysmal atrial fibrillation: study of the pattern of onset using dynamic electrocardiography]
No full textWe have examined 24 hours ECG Holter recordings of 22 patients without any organic heart disease and with recurrent episodes of paroxysmal atrial fibrillation (PAF) to check the possible sympatho-vagal influence on spontaneous initiation. Patients were divided into 3 groups according to average heart rate (HR) during the 24 hours recording and to the mode of onset of the arrhythmia: sympathetic (only diurnal episodes, HR greater than or equal to 75 b/min before the onset of the episode, average 24 hours HR greater than or equal to 80 b/min, progressive or sudden shortening of sinusal cycle before the onset), vagal (only nocturnal episodes, HR less than or equal to 60 b/min before the onset, average 24 hours HR less than or equal to 60 b/min, progressive or sudden lengthening of sinusal cycle before the onset of the episode) or "others" who did not show the aforementioned characteristics
Contemporary balloon aortic valvuloplasty: Changing indications and refined technique
No full textEven if unable to improve long-term prognosis, balloon aortic valvuloplasty (BAV) may be useful in selected patients with symptomatic severe aortic stenosis either as a bridge to surgical or transcatheter valve replacement (aortic valve replacement [AVR] or transcatheter aortic valve implantation [TAVI]) or as a triage strategy for patients with uncertain indications. International guidelines recommend BAV as: a “bridge” to AVR/TAVI, a “trial” in patients with undetermined symptoms, or a “bridge-to-decision” in case of comorbidities. However, in clinical practice, BAV is also used as a palliative measure to improve hemodynamics and quality of life in many patients who are excluded from AVR/TAVI. Finally, BAV is often performed during TAVI to facilitate prosthesis delivery, optimize frame expansion, or for bioprosthetic valve fracture in selected valve-in-valve procedures. Technical innovations, which allow for a mini-invasive approach via transradial access and pacing delivered through the wire, have led to a decrease in complications over time. This review focuses on contemporary BAV with a specific emphasis on new indications, innovative techniques, and specific complex patient subgroups
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Propafenone: evaluation of antiarrhythmic efficacy in hyperkinetic ventricular arrhythmia using acute oral test]
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