The American journal of cardiology
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Review Practice Guideline Guideline
Guidelines for approval of anti-obesity drugs affecting atherosclerosis and/or lipids. The international union of pharmacology (IUPHAR).
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Comparative Study
Circadian variation of the QT interval in patients with sudden cardiac death after myocardial infarction.
To evaluate the potential prognostic value of the circadian variation of QT intervals in predicting sudden cardiac death (SCD) in patients after myocardial infarction (MI), 15 pairs of post-MI patients (15 died suddenly within 1 year after MI [SCD victims] and 15 remained event-free [MI survivors]) were studied (mean age 60 +/- 8 years; 24 men and 6 women). The pairs were matched for age, gender, infarct site, presence of Q wave, left ventricular ejection fraction, thrombolytic and beta-blocker therapy. Fourteen normal subjects served as controls (mean age 55 +/- 9 years; 12 men). ⋯ The 24-hour mean value of QTc was significantly longer in SCD victims than in normal subjects (424 +/- 25 vs 402 +/- 21 ms, p = 0.02), and in MI survivors (424 +/- 25 vs 404 +/- 32 ms, p < 0.05). The QTc interval of SCD victims differed from that of normal subjects during both the day (421 +/- 25 vs 400 +/- 17 ms, p = 0.02) and night (424 +/- 26 vs 403 +/- 23 ms, p = 0.03). Thus, blunted circadian variation in QT intervals, abolished circadian variation in QTc intervals, and prolonged QTc intervals may suggest an increased risk of SCD in patients after MI.
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Between September 1989 and December 1991, modified De Vega tricuspid annuloplasty was performed in 43 patients who survived surgery for mitral or mitral plus aortic valve replacement. The preoperative indications for tricuspid annuloplasty were moderate to severe tricuspid regurgitation (TR) in 33 patients and mild or no TR but with a dilated tricuspid annulus (> or =30 mm) as measured by 2-dimensional echocardiography at end-diastole in 10 patients. The mean age was 31 +/- 13 years. ⋯ During the study period, an additional 77 patients underwent mitral valve replacement or double valve replacement, but without tricuspid annuloplasty. Within this group, 38 patients had a preoperative tricuspid annulus diameter of > or =30 mm, and 5 of these patients (13%) developed moderate or severe TR in the postoperative period, which may have been prevented had clinicians adhered to the preoperative indications for tricuspid annuloplasty. Thus, preoperative echocardiographically documented moderate or severe TR or a tricuspid annulus diameter of > or =30 mm are valid indications for performing tricuspid annuloplasty; modified De Vega tricuspid annuloplasty is a durable procedure in rheumatic patients; it appears that reducing the diastolic tricuspid annulus diameter to 24 mm is adequate to prevent residual TR in the long term.
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Randomized Controlled Trial Multicenter Study Clinical Trial
Design of a clinical trial for the assessment of cardioversion using transesophageal echocardiography (The ACUTE Multicenter Study). Steering and Publications Committees of the ACUTE Study.
Patients with atrial fibrillation (AF) undergoing cardioversion are at an increased risk of cardioembolic stroke and require anticoagulation. The Assessment of Cardioversion Using Transesophageal Echocardiography (ACUTE) Multicenter Study is a randomized clinical trial of patients undergoing electrical cardioversion of AF of >2 days' duration comparing a transesophageal-guided strategy (TEE) with brief anticoagulation to the conventional anticoagulation strategy. Patients randomly assigned to the TEE-guided strategy receive therapeutic anticoagulation before TEE and cardioversion, followed by 4 weeks of anticoagulation. ⋯ The anticipated rates of embolism of 2.9% for conventional strategy and 1.2% for the TEE-guided strategy are based on published research and the completed pilot study. The ACUTE Multicenter Study will randomize therapy and follow an estimated 3,000 patients from 65 study sites to determine the relative efficacy of the TEE-guided and conventional approaches to electrical cardioversion for patients in AF. The results of this investigation will have important clinical implications for the management of patients with AF undergoing electrical cardioversion.
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In subjects with a recent acute myocardial infarction, the hour immediately following awakening is associated with an abrupt exaggeration of heart rate-dependent changes and variability of the QT interval. Beta blockers were observed to blunt these waking hour changes.