Browsing by Author "Quezada, Felipe"

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    Association of Remote Hypertension in Pregnancy With Coronary Artery Disease A Case-Control Study
    (LIPPINCOTT WILLIAMS & WILKINS, 2009) Valdes, Gloria; Quezada, Felipe; Marchant, Eugenio; von Schultzendorff, Astrid; Moran, Sergio; Padilla, Oslando; Martinez, Alejandro
    Because hypertensive pregnancies have been associated with increased cardiovascular disease, we aimed to identify whether angiographically characterized coronary artery disease differed in women with previous normotensive pregnancies or hypertensive pregnancies (HPs). The study group included 217 parous women, aged 60.9 +/- 9.2 (SD) years, who required coronary angiography between January 2006 and December 2007, 36.8 +/- 9.9 and 28.8 +/- 10.5 years after their first and last pregnancy, respectively; 146 had normotensive pregnancies and 71 had >= 1 HP, according to a questionnaire including reproductive history and cardiovascular risks. Body mass index, smoking, and frequency of diabetes were similar in both groups. Chronic hypertension (93% versus 78%; P=0.007), hyperlipidemia (82% versus 69%; P=0.049), and premature familial cardiovascular disease (42% versus 20%; P=0.001) prevailed in HPs. Participants with HPs were younger (58.9 +/- 8.3 versus 61.9 +/- 9.6 years; P=0.025) than participants with normotensive pregnancies. Although 49% of all participants had hemodynamically significant coronary artery disease (>= 70% stenosis), no differences were observed between groups in the number of stenotic arteries; however, their number increased by 28% and 22% over a 10-year period in HPs and normotensive pregnancies, respectively (P=0.034). Multivariate analysis showed that HPs had a nonsignificant risk of having coronary artery disease (odds ratio: 1.21; 95% CI: 0.64 to 2.28), and being a current smoker (odds ratio: 4.13; 95% CI: 1.85 to 9.25), a diabetic (odds ratio: 2.29; 95% CI: 1.85 to 9.25), or having a family history of premature cardiovascular disease (odds ratio: 2.34; 95% CI: 1.17 to 2.39) significantly increased the risk of coronary artery disease. This study demonstrates that women with HPs have earlier coronary disease, probably related to intermediate cardiovascular risks that have a gestational expression. (Hypertension. 2009; 53: 733-738.)
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    Autograft versus allograft with or without demineralized bone matrix in posterolateral lumbar fusion in rabbits - Laboratory investigation
    (AMER ASSOC NEUROLOGICAL SURGEONS, 2008) Urrutia, Julio; Thumm, Nicolas; Apablaza, Daniel; Pizarro, Felipe; Zylberberg, Alejandro; Quezada, Felipe
    Object. Posterolateral spinal fusions are performed to treat different spinal disorders. Autograft continues to be the gold standard; it is, however, associated with donor site morbidity and limited sources. Allograft has been used, but has been reported to result in lower fusion rates. Demineralized bone matrix (DBM) has also been used and reportedly increases the fusion rate in a variety of critical defect models. Different forms of DBM are available, not all have been independently studied. To evaluate the effect of a xenogenic DBM added to allograft on the fusion rate of posterolateral lumbar spine arthrodesis the authors designed an experimental study comparing posterolateral fusion rate using autograft, allograft, and allograft plus a xenogenic DBM in a validated animal model.
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    Entry Deterrence and Collusion at Repeated Multiunit Auctions of ITQs
    (2022) Pena-Torres, Julio; Munoz, Roberto; Quezada, Felipe
    We study revenue, entry, and possible collusion outcomes in the Chilean fishery with the longest record of individual transferable share quotas allocated via public auctions. We examine 18 annual multi-object auctions and two different auction designs at work. Based on results from a numerically calibrated auction model and econometric estimates, we claim that the repeated use of sequential oral (multiunit) auctions was particularly prone to bid rigging and facilitated entry deterrence. Yet, efficient entry was possible thanks to fully transferable quota rights. We highlight two conclusions from these results: First, when selling multiple production rights in a highly concentrated industry repeatedly over time, auctioneers should avoid using sequential, English auctions. Second, transferable production rights help overcome inefficiencies that can arise from design flaws in the chosen mechanism for allocating these rights.
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    The effect of ketoprophen on lumbar spinal fusion healing in a rabbit model
    (AMER ASSOC NEUROLOGICAL SURGEONS, 2007) Urrutia, Julio; Mardones, Rodrigo; Quezada, Felipe
    Object. Several reports have shown that nonsteroidal antiinflammatory drugs (NSAIDs) have an inhibitory effect in osteogenesis and reduce heterotopic ossification in humans. A deleterious effect of NSAIDs in posterolateral intertransverse process fusion has also been suggested. The authors used a validated rabbit model to try to determine the influence of the NSAID ketoprophen on the fusion rate in lumbar spinal arthrodesis.