instruction:
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.
question:
Context: To determine whether follicle curetting at the time of oocyte retrieval increases oocyte yield.', 'Retrospective review of all patients who underwent oocyte retrieval from July 1, 2003 to June 30, 2005.', 'Number of oocytes retrieved.', 'retrieval time, number of cryopreserved embryos, pregnancy rates, and incidence of ovarian hyperstimulation syndrome.', 'There were no differences in patient demographics, antral follicle count, cycle stimulation characteristics, fertilization rates, embryo quantity or quality, embryo cryopreservation rates, clinical pregnancy rates, live birth rates, or ovarian hyperstimulation syndrome between the groups. Retrievals that utilized curetting took three minutes longer. Follicle curetting significantly increased the number of oocytes retrieved, 13.9 +/- 0.6 compared to 11.4 +/- 0.6 oocytes without curetting (P = 0.003). The quantity of mature oocytes was also increased with curetting (10.3 +/- 0.5 versus 8.4 +/- 0.5, P = 0.006).\Question: Does follicle curetting at the time of oocyte retrieval increase the oocyte yield?
answer:
This study demonstrated that follicle curetting significantly increased oocyte yield. While it did not increase live birth rates, this increase in oocyte yield should lead to increased numbers of embryos for selection at transfer and increased embryos for cryopreservation.


question:
Context: Some subjects with suspected asthma and a negative exercise challenge test (ECT) demonstrate improved expiratory flow rates after administration of bronchodilators (BD) at the end of the ECT (unpublished observation). This study investigated whether this response predicts the presence of bronchial hyperreactivity (BHR).', 'The study population included 133 young adults (29.4% women) 21.1 +/- 4.2 years of age who underwent ECT and a methacholine challenge test (MCT). A receiver-operator-characteristic curve was used to calculate the optimal cutoff level of the response to BD as a predictor of BHR according to MCT.', 'Using a MCT cutoff level of PC(20) </= 4 mg/mL showed BHR in 12.8% of subjects. Failure to improve FEV(1) by 8% after BD administration predicted the absence of BHR with sensitivity, specificity, and positive and negative predictive values of 76.5%, 68.4%, 25.3%, and 95.5%, respectively. Avoiding MCT in subjects with less than 8% response to BD would have saved 62.5% of the MCTs and would have missed only four (3%) patients with BHR.\Question: Does response to bronchodilators after exercise challenge predict bronchial hyperreactivity?
answer:
BD should be administered routinely after ECT, as the response may be used as a simple, inexpensive tool to predict BHR in young patients and may substantially reduce the number of unnecessary MCTs.


question:
Context: This study was designed to assess changes in blood flow of the dog cauda equina after lumbar sympathectomy using an experimental chronic cauda compression model.', 'The cauda equina was compressed at 10 mm Hg with a plastic balloon in all animals (n = 12). One week later, bilateral lumbar sympathectomy was carried out in the LSX group (n = 7), and vessels of the cauda equina were thereafter observed for 90 minutes using a specially designed microscope supplied with a video camera. Five animals did not undergo sympathectomy and were used as controls. The volume of blood flow was calculated from two parameters: velocity (mm/s) and diameter (microm) of a vessel observed in each animal.', 'The increment in vessel diameter in the LSX group was pronounced at 30 and 45 minutes after sympathectomy compared with the control group (P < 0.05). Blood flow in the LSX group was increased at 30 minutes depending on dilation of the vessel diameter compared with the control group (P < 0.05). The velocity in the observed vessels remained unchanged throughout the measurements.\Question: Does lumbar sympathectomy increase blood flow in a dog model of chronic cauda equina compression?
answer:

These data suggest that lumbar sympathectomy could induce an increase in blood flow of the compressed cauda equina. As lumbar sympathetic block increases blood flow not only in the lower limbs but also in the cauda equina, it might be evaluated for a conservative treatment of intermittent claudication due to lumbar spinal canal stenosis.