In this task, you are given a passage which has a question and the context. You have to generate an answer to the question based on the information present in the context.

Input: Consider Input: Context: Re-stenosis after percutaneous coronary angioplasty (PTCA) is related to clinical and angiographic features.', 'To describe the clinical and angiographic characteristic of our patients with coronary cardiopathy subjected to PTCA and the predictor factors for re-stenosis.', 'We gathered the clinical and angiographic characteristics of all patients who underwent a successful PTCA of a native coronary artery. All patients had a clinical assessment one year after the procedure. Patients were classified in Group 1, if they did not have angina or coronary events after the angioplasty or Group 2, if they had angina or a coronary event after the procedure. Only Group 2 patients were subjected to a coronary angiogram.', 'We collected 383 PTCA procedures. Follow up information was obtained in 92.2%. Three hundred forty two patients (89.3%) were assessed one year the procedure. Nine patients (2.3%) died of a cardiovascular cause. Ninety patients (26.3%) were classified in Group 2. In 65 patients, angiographic re-stenosis was demonstrated (19%). Re-stenosis occurred in 36 and 13% of patients with an without Diabetes Mellitus, respectively (p <0.01). The other clinical predictor variables were a history of myocardial infarction (p =0.007), obesity (p =0.041) and hypercholesterolemia (p =0.050). None of the angiographic characteristics predicted restenosis. Stents were protective factors against restenosis (15.6% in stented lesions vs 25.4% in nonstented; p =0.01).\Question: Do [ One year follow up of successful coronary angioplasty in non selected patients ]?

Output: Re-stenosis after angioplasty occurred in 19% of our patients with angina or coronary events. The clinical variables associated with a higher risk of re-stenosis were diabetes (the main risk factor), previous myocardial infarction, obesity and hypercholesterolemia. Angiographic variables were not associated with re-stenosis. The use of stents decreases the incidence of re-stenosis in all groups).

Input: Consider Input: Context: Therapeutic and prophylactic vena cava filters (VCFs) are used to prevent pulmonary embolism. Concerns exist over placing a permanent filter in a young trauma patient. Recently, retrievable VCFs have become available. One such filter is the OptEase, which has a recommended time of removal of up to 23 days after insertion. Data supporting this recommendation are sparse. Many trauma patients will need filters for more than 2 weeks, and there are no data evaluating the safety of removal after extended time periods. The purpose of this study was to determine the safety, feasibility, and reaction of the vena cava when removing the OptEase retrievable VCF at different time intervals.', 'Twenty Yorkshire cross pigs (80-113 kg) underwent general anesthesia with tiletamine and zolazepam. Filters were placed in the infrarenal vena cava (VC) through the femoral vein under fluoroscopic guidance. Animals were then divided into four groups. In group 1, filters were removed at 14 days; in group 2, at 30 days; in group 3, at 60 days; and in group 4, at 90 days. Removal was attempted using a snare-and-sheath technique through the femoral vein. Animals with successful filter removal were allowed to recover; then, the animals underwent autopsy (gross and microscopic VC examination) 2 months later. Animals with unsuccessful filter removal underwent autopsy immediately after attempted removal. Venacavograms were taken at filter insertion, at removal, and before autopsy to evaluate any VC abnormalities.', 'Successful removal of the filter in all five pigs (100%) was reliably performed only in the 14-day group. In this group, the initial VC transverse diameter was 19.4 +/- 0.8 mm and was significantly reduced to 9.8 +/- 1.1 mm (p < 0.05) immediately after removal. Sixty days later, before autopsy, VC diameter had increased to 15.3 +/- 1.9 mm, which was significantly larger than at removal (p < 0.05) but not different from the initial value. In the 30-day group, removal was successful in only one of five animals. Although removal was successful in the one pig, autopsy at 2 months postremoval revealed total occlusion of the VC. Filters could not be removed from 60- and 90-day groups. At autopsy, the VCF struts were embedded or protruded through the VC wall. Microscopic examination of the VC revealed significant scarring underneath and between the struts.\Question: Is removal of the OptEase retrievable vena cava filter feasible after extended time periods because of filter protrusion through the vena cava?

Output: Removal of the retrievable OptEase VCF may be successfully performed up to 14 days after insertion. Strut protrusion through the VC wall prohibited successful and safe removal at extended time intervals.

Input: Consider Input: Context: To evaluate the staging accuracy of preoperative multiparametric MRI (mp-MRI), its influence on the technique of radical retropubic prostatectomy (RRP), and its value for daily clinical practice.', 'A total of 106 patients underwent RRP (January 2011-June 2012) and had preoperative MRI staging data available for review. Staging results acquired by mp-MRI were correlated to both biopsy and histopathology results. Surgical reports were reviewed for intraoperative aspect of tumor extension, technique of RRP (nerve sparing or extended), and extent of lymphadenectomy.', 'The accuracy of diagnosing extracapsular extension (ECE) was 72.2 %, with an overall sensitivity and specificity of 30.0 and 93.3 %, respectively. The negative predictive value was 72.7 %. The sensitivity and specificity to diagnose positive seminal vesical invasion (SVI) were 63.6 and 92.9 %, respectively. Neither higher field force nor the use of an endorectal coil could enhance the accuracy of mp-MRI. In case of awareness of an existing MRI, there was a significantly higher percentage of nerve protection (left: 93 %; right: 89 % vs. left 75 %; right: 75 %). The higher percentage of nerve sparing surgery did not result in a higher level of positive resection margins.\Question: Does preoperative mp-MRI of the prostate provide little information about staging of prostate carcinoma in daily clinical practice?
Output: In routine clinical practice, mp-MRI at non-academic centers has very limited clinical value in predicting ECE and SVI. Our data support the current recommendations against the widespread preoperative use of mp-MRI because it is not adding reliable predictive information on the extent of prostate cancer.