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Good Short-term (good + short-term)

Distribution by Scientific Domains

Medical Sciences	75%

Selected Abstracts

Forecasting performance of extreme-value volatility estimators

THE JOURNAL OF FUTURES MARKETS, Issue 11 2007
Vipul
This study evaluates the forecasting performance of extreme-value volatility estimators for the equity-based Nifty Index using two-scale realized volatility. This benchmark mitigates the effect of microstructure noise in the realized volatility. Extreme-value estimates with relatively simple forecasting methods provide substantially better short-term and long-term forecasts, compared to historical volatility. The higher efficiency of extreme-value estimators is primarily responsible for this improvement. The extent of possible improvement in forecasts is likely to be economically significant for applications like options pricing. By including extremevalue estimators, the forecasting performance of generalized autoregressive conditional heteroscedasticity (GARCH) can also be improved. © 2007 Wiley Periodicals, Inc. Jrl Fut Mark 27: 1085,1105, 2007 [source]

Dorsal onlay augmentation urethroplasty with small intestinal submucosa: Modified Barbagli technique for strictures of the bulbar urethra

INTERNATIONAL JOURNAL OF UROLOGY, Issue 11 2006
IVO I DONKOV
Aim: To present the results from one clinic's experience of using small intestinal submucosa (SIS) in augmentation urethroplasty for management of strictures of the bulbar urethra. Methods: Urethral surgery was performed in nine men with strictures 4,6 cm. All of the patients were evaluated by history, physical examination, retrograde urethrogram, and uroflowmetry. Four layers of SIS were soaked in saline or Ringer's solution for 15 minutes at 37°C, and the inner surface of the patch was gently fenestrated with a thin scalpel. The patch was spread-fixed onto the tunica albuginea. The mucosa was sutured to the submucosal graft first at 2,3 mm inwards from the SIS margins, then the spongiosum tissue was attached to the margins with interrupted absorbable sutures. Results: Of the nine patients who underwent augmentation urethroplasty using SIS, only one had re-stricture at 6 months due to urethral infection. At 18 months after the surgery the uroflowmetry of the other eight patients was 20,21 mL/s. In terms of complications, six patients reported having post-micturition dribbling, and seven patients reported lack of morning erections for 35,69 days after surgery. Conclusions: Using SIS is a safe procedure; however, long-term follow-up is needed to substantiate the good short-term results. [source]

Treatment of internal iliac artery aneurysms: single-centre experience

ANZ JOURNAL OF SURGERY, Issue 4 2009
Nikolaos Tsilimparis
Abstract Background:, The aim of the present study was to analyse the short-term results of treatment of internal iliac artery aneurysms (IIAA). Methods:, In a prospective single-centre cohort study all patients with IIAA (symptomatic or maximal diameter ,30 mm) were evaluated for endovascular repair, which included coil embolization of the run-off vessels and coverage of the orifice of the IIAA with a stent graft. Open repair was performed with aneurysm excision or aneurysmorrhaphy. Outcome criteria were technical and clinical success and complications of treatment. Results:, In a period of 40 months 11 patients underwent operation for 12 IIAA. Nine aneurysms were repaired endovascularly and three with open repair. Coil embolization was routinely performed in all cases. At a median follow up of 18 months, technical and clinical success was 100%. Major complications included two early limb thromboses, a contrast-agent-induced nephropathy, and an intraoperative ureteric injury. Conclusion:, Despite the limited number of patients, the present series, with good short-term results, further supports the trend towards endovascular repair of suitable IIAA. [source]

Expanded PTFE bladder neck slings for incontinence in children: the long-term outcome

BJU INTERNATIONAL, Issue 1 2004
P. Godbole
OBJECTIVE To assess the long-term outcome of circumferential expanded PTFE (Gore-texTM, WL Gore Associates, Scotland) bladder neck slings for achieving urethral continence in children with a neuropathic bladder. PATIENTS AND METHODS The records were reviewed of 19 children undergoing bladder reconstruction (most with a neuropathic bladder) who had a Gore-tex sling placed circumferentially at the bladder neck, over a 5-year period. Of these, seven had spina bifida; two each spinal dysraphism, surgery for anorectal anomalies and an idiopathic neuropathic bladder; five who developed a neuropathic bladder from other causes, and one born with bladder exstrophy. All children had an uncompliant bladder with a low urethral leak-point pressure on preoperative urodynamics. In all children conventional clean intermittent catheterization and pharmacotherapy had failed. Four had had previous augmentation surgery while 15 had concomitant bladder augmentation and formation of a Mitrofanoff stoma. The main outcome measure was achieving dryness. The original intention of the procedure was also to maintain urethral catheterization. RESULTS Full details of the follow-up were available in 17 patients. Despite initial good short-term results, at a median follow up of 7 years, in 14 patients the sling had to be removed because of erosion, often with transient urethral leakage before the bladder neck subsequently closed. A bladder calculus was associated with each case of erosion except one. CONCLUSION Although in the short term this technique had favourable results, it was not a useful technique in the long term. [source]