Papers by Mariana Gonzalez
Resuscitation, 2015
Sudden cardiac arrest (SCA) strikes over 40,000 people in the public environment annually in the ... more Sudden cardiac arrest (SCA) strikes over 40,000 people in the public environment annually in the U.S., but despite evidence-based interventions such as prompt CPR and defibrillation, less than 25% of patients survive public SCA events. Effective use of automated external defibrillators (AEDs), especially by lay bystanders, represents an important strategy to improve survival rates. Previous investigations in Europe and Asia have demonstrated variable public awareness of AEDs; layperson knowledge of AEDs in the U.S. is poorly characterized. To measure understanding of AEDs among the general public, at multiple sites within a busy urban transportation system. Surveys were administered at two high-volume train stations in Philadelphia, Pennsylvania between April and June, 2013. A total of 514 surveys were completed. Two thirds (66%) of respondents were able to correctly identify an AED and its purpose, and just over half (58%) of respondents reported willingness to use an AED in an emergency situation. Less than 10% of respondents presented with a hypothetical SCA scenario spontaneously mentioned using an AED when asked what actions they would take. In this cross-sectional survey, public knowledge about AEDs and their use was high; however, a smaller number of respondents expressed thoughts of using the device in an emergency situation and demonstrated willingness to serve as a responder. Increased education and training efforts, as well as potential interventions such as 911 dispatcher-assisted AED use may help improve bystander response in SCA events.
Therapeutic hypothermia and temperature management, 2012
Urgent coronary angiography following cardiac arrest is an important consideration as part of a t... more Urgent coronary angiography following cardiac arrest is an important consideration as part of a therapeutic hypothermia/postresuscitation care bundle. Few data exist to guide the selection of patients who should receive postarrest angiography. This investigation sought to evaluate patient-level variables on initial postarrest presentation and their association with significant coronary lesions on subsequent angiography. Clinical and angiographic data were collected on consecutive postarrest patients from July 2007 to April 2012 who underwent coronary angiography during hospitalization. Univariate and multivariable analyses were performed to determine the relationship between patient characteristics, clinical data, and the outcome measure, defined as the presence of at least one coronary lesion with >75% stenosis. Of 527 cardiac arrest patients, 267 achieved return of spontaneous circulation; 106 of these initial survivors received coronary angiography. This cohort had a mean age ...
Resuscitation, 2013
Objective: Therapeutic hypothermia, also known as targeted temperature management (TTM), improves... more Objective: Therapeutic hypothermia, also known as targeted temperature management (TTM), improves clinical outcomes in patients resuscitated from cardiac arrest. Hyperthermia after discontinuation of active temperature management ("rebound pyrexia") has been observed, but its incidence and association with clinical outcomes is poorly described. We hypothesized that rebound pyrexia is common after rewarming in post-arrest patients and is associated with poor neurologic outcomes. Methods: Retrospective multicenter US clinical registry study of post-cardiac arrest patients treated with TTM at 11 hospitals between 5/2005 and 10/2011. We assessed the incidence of rebound pyrexia (defined as temperature >38 • C) in post-arrest patients treated with TTM and subsequent clinical outcomes of survival to discharge and "good" neurologic outcome at discharge, defined as cerebral performance category (CPC) 1-2. Results: In this cohort of 236 post-arrest patients treated with TTM, mean age was 58.1 ± 15.7 y and 106/236 (45%) were female. Of patients who survived at least 24 h after TTM discontinuation (n = 167), post-rewarming pyrexia occurred in 69/167 (41%), with a median maximum temperature of 38.7 (IQR 38.3-38.9). There were no significant differences between patients experiencing any pyrexia and those without pyrexia regarding either survival to discharge (37/69 (54%) v 51/98 (52%), p = 0.88) or good neurologic outcomes (26/37 (70%) v 42/51 (82%), p = 0.21). We compared patients with marked pyrexia (greater than the median pyrexia of 38.7 • C) versus those who experienced no pyrexia or milder pyrexia (below the median) and found that survival to discharge was not statistically significant (40% v 56% p = 0.16). However, marked pyrexia was associated with a significantly lower proportion of CPC 1-2 survivors (58% v 80% p = 0.04). Conclusions: Rebound pyrexia occurred in 41% of TTM-treated post-arrest patients, and was not associated with lower survival to discharge or worsened neurologic outcomes. However, among patients with pyrexia, higher maximum temperature (>38.7 • C) was associated with worse neurologic outcomes among survivors to hospital discharge.
Critical Care Medicine, 2012
Objective-Recent work suggests that delivery of continuous chest compression cardiopulmonary resu... more Objective-Recent work suggests that delivery of continuous chest compression cardiopulmonary resuscitation is an acceptable layperson resuscitation strategy, although little is known about layperson preferences for cardiopulmonary resuscitation training in continuous chest compression cardiopulmonary resuscitation. We hypothesized that continuous chest compression cardiopulmonary resuscitation education would lead to greater trainee confidence and would encourage wider dissemination of cardiopulmonary resuscitation skills compared to standard cardiopulmonary resuscitation training (30 compressions: two breaths).
Eur Food Res Technol, 1988
Exp Mol Pathol, 2000
Induction of cell and gland enlargement (growth-in-size) and induction of a group of secretory po... more Induction of cell and gland enlargement (growth-in-size) and induction of a group of secretory polypeptides (polypeptides C-G) seem to occur in close relationship in mouse parotid glands stimulated chronically by the nonselective beta-adrenergic agonist isoproterenol. To determine whether beta(1), beta(2), or both subtypes of beta-adrenergic receptors are involved in those responses, dose-dependency studies were carried out during a 7-day period of daily stimulations to assess the relative abilities of the selective beta-adrenergic agonists dobutamine (beta(1)) and salbutamol (beta(2)) to induce polypeptides C-G and growth-in-size. The relative abilities of the selective beta-adrenoceptor antagonists atenolol (beta(1)) and I.C.I. 118.551 (beta(2)) to interfere with the induction of both responses by chronic treatment with the various beta-adrenergic agonists were also studied. Parotid growth-in-size was assessed by evaluating wet weight, whole protein content, and light microscopy histology. The presence of polypeptides C-G was evaluated after SDS-polyacrylamide gel electrophoresis and Coomassie blue staining. Under these experimental conditions, dobutamine was found to be at least one order of magnitude more potent than salbutamol at inducing growth-in-size. Dobutamine was also found to be clearly stronger than salbutamol as an inducer of polypeptides C-G. On the other hand, atenolol was more effective than I.C.I. 118.551 at preventing the induction of polypeptides C-G and growth-in-size by isoproterenol, dobutamine, or salbutamol. Taken together, these results suggest that in mouse parotid glands, polypeptides C-G and growth-in-size are induced preferentially via adrenergic receptors of the beta(1)-subtype.
Fert Steril, 2008
Patients were (1) trying to conceive/seeking information (n¼152); (2) currently seeing an Ob-Gyn/... more Patients were (1) trying to conceive/seeking information (n¼152); (2) currently seeing an Ob-Gyn/PCP (n¼109); or (3) currently seeing an RE specialist (n¼157). Questions focused on prior fertility treatments; current status and if not in treatment, reasons for discontinuing; awareness of healthcare benefits for fertility medications (FM); and intent to be treated if not currently in treatment.
Boletin chileno de parasitologia
The last national survey on seroprevalence of T. cruzi human infection in Uruguay, showed a 3.4% ... more The last national survey on seroprevalence of T. cruzi human infection in Uruguay, showed a 3.4% in adults from endemic areas. Since 1983, antivectorial actions of the control program have been carried out continually. In consequence, household infestation by Triatoma infestan, the main vector of T. cruzi in Uruguay, decreased in all endemic areas and was completely eliminated in some of them. The objectives of the present work are to evaluate the new seroepidemiological situation. A representative sampling of rural and urban population was undertaken, to include six and twelve year-old school children from three departments: Artigas, Rivera and Tacuarembo. The whole sample included 4,722 school children, evaluated by the indirect immunofluorescence (IFI) test for Chagaś disease. The seroprevalence of T. cruzi infection in the six year-old group was 0.3% in Artigas, 0.6% in Rivera and 1.0% in Tacuarembo. The seropositive children with seropositive mothers support the possible congen...
Revista chilena de infectología, 2014
Fluoroquinolones (FQ) are the most widely used drugs for the empirical treatment of urinary tract... more Fluoroquinolones (FQ) are the most widely used drugs for the empirical treatment of urinary tract infection (UTI) in Uruguay. The rates of fluoroquinolone resistance are increasing. The objective was to determine the risk factors associated with the development of community-acquired UTI caused by fluoroquinolone-resistant Escherichia coli (ECRFQ). A descriptive, cross-sectional, prospective study of 525 patients with community-acquired UTI, who consulted at the Hospital Pasteur Emergency Department was carried. In 434 patients (82.7%) E. coli was the cause of UTI. Multivariate analysis identified as independent risk factors for the development of ECRFQ UTI, being older than 60 years (OR 2.52 95% CI 1.35 to 4.72), having obstructive uropathy (OR 2 09 95% CI 1.03 to 4.28) with recurrent UTI history (OR 2.98 95% CI 1.55 to 5.76) and / or use of FQ in the previous 3 months (OR 4.27 95% CI 1.88 to 9.71). Patients with these characteristics have a higher risk of ECRFQ UTI and should be treated with alternative drugs.
Lecture Notes in Computer Science, 2007
Page 1. MJ Smith, G. Salvendy (Eds.): Human Interface, Part II, HCII 2007, LNCS 4558, pp. 156165... more Page 1. MJ Smith, G. Salvendy (Eds.): Human Interface, Part II, HCII 2007, LNCS 4558, pp. 156165, 2007. © Springer-Verlag Berlin Heidelberg 2007 Disseminating and Sharing Information Through Time-Aware Public Displays ...
Innate immunity, 2009
Cetuximab, an anti-epidermal growth factor receptor monoclonal antibody, has been shown to increa... more Cetuximab, an anti-epidermal growth factor receptor monoclonal antibody, has been shown to increase the median survival of colorectal cancer patients. We previously reported that the expression of HLA-E is significantly increased in primary human colorectal cancer, perhaps contributing to tumour escape from immune surveillance. To establish if HLA-E could be a factor that renders colorectal cancer cells less susceptible to antibody-dependent cellular cytotoxicity (ADCC), in the present study we analysed Cetuximab-mediated cytotoxicity against several colorectal cancer cell lines expressing, or not, HLA-E at the cell surface. We first observed that colorectal cancer cells treated with Cetuximab were killed more efficiently by ADCC. Interestingly, treatment of target cells with recombinant human-beta2-microglobulin inhibits Cetuximab-mediated ADCC through HLA-E membrane stabilization. The specific immunosuppressive role of HLA-E was confirmed using an anti-NKG2A monoclonal antibody, t...
Biomédica, 2012
Mariolga Berrizbeitia: coordinadora del proyecto a nivel regional, realización del análisis estad... more Mariolga Berrizbeitia: coordinadora del proyecto a nivel regional, realización del análisis estadístico y escritura del manuscrito. Juan Luis Concepción: coordinador nacional del proyecto, revisión y aprobación del manuscrito. Valentina Cazorla: realización de los ensayos, contribución en la escritura del manuscrito. Jessicca Rodríguez: realización de los ensayos. Ana Cáceres y Wilfredo Quiñones: asesoría en la elaboración del proyecto, revisión del análisis estadístico. ARTÍCULO ORIGINAL Biomédica 2013;33:214-25 doi: http://dx.doi.org/10.7705/biomedica.v33i2.760 Seroprevalencia de la infección por Trypanosoma cruzi en Canis familiaris del estado Sucre, Venezuela
Tetrahedron Letters, 2011
A total synthesis of (−)-muricatacin has been achieved using a commercially available starting ma... more A total synthesis of (−)-muricatacin has been achieved using a commercially available starting material and our furan approach to oxacyclic systems, the proven scope of which is thus broadened.
PLoS ONE, 2014
Most cases of BCR-ABL1-negative myeloproliferative neoplasms (MPNs), essential thrombocythemia, p... more Most cases of BCR-ABL1-negative myeloproliferative neoplasms (MPNs), essential thrombocythemia, polycythemia vera and primary myelofibrosis are associated with JAK2 V617F mutations. The outcomes of these cases are critically influenced by the transition from JAK2 V617F heterozygosity to homozygosity. Therefore, a technique providing an unbiased assessment of the critical allele burden, 50% JAK2 V617F , is highly desirable. In this study, we present an approach to assess the JAK2 V617F burden from genomic DNA (gDNA) and complementary DNA (cDNA) using one-plus-one template references for allele-specific quantitative-real-time-PCR (qPCR). Plasmidic gDNA and cDNA constructs encompassing one PCR template for JAK2 V617F spaced from one template for JAK2 Wild Type were constructed by multiple fusion PCR amplifications. Repeated assessments of the 50% JAK2 V617F burden within the dynamic range of serial dilutions of gDNA and cDNA constructs resulted in 52.5364.2% and 51.4664.21%, respectively. The mutation-positive cutoff was estimated to be 3.65% (mean +2 standard deviation) using 20 samples from a healthy population. This qPCR approach was compared with the qualitative ARMS-PCR technique and with two standard methods based on qPCR, and highly significant correlations were obtained in all cases. qPCR assays were performed on paired gDNA/cDNA samples from 20 MPN patients, and the JAK2 V617F expression showed a significant correlation with the allele burden. Our data demonstrate that the qPCR method using one-plus-one template references provides an improved assessment of the clinically relevant transition of JAK2 V617F from heterozygosity to homozygosity.
Phytochemistry, 2013
Bioassay-guided fractionation of the bio-active organic extract obtained from solid-media culture... more Bioassay-guided fractionation of the bio-active organic extract obtained from solid-media culture of MEXU 27095, an endophytic fungus isolated from the Mexican medicinal plant Hintonia latiflora (Rubiaceae), led to separation of three tridepsides which were identified as thielavins A, J and K. All three compounds inhibited Saccharomyces cerevisieae α-glucosidase (αGHY) in a concentration-dependent manner with IC50 values of 23.8, 15.8, and 22.1μM, respectively. Their inhibitory action was higher than that of acarbose (IC50=545μM), used as a positive control. Kinetic analysis established that the three compounds acted as non-competitive inhibitors with ki values of 27.8, 66.2 and 55.4μM, respectively (α=1.0, 1.2, 0.7, respectively); acarbose behaved as competitive inhibitor with a ki value of 156.1μM. Thielavin J inhibited the activity of α-glucosidase from Bacillus stearothermophilus (αGHBs) with an IC50 of 30.5μM, being less active than acarbose (IC50=0. 015μM); in this case, compound (2) (ki=20.0μM and α=2.9) and acarbose (ki=0.008μM and α=1.9) behaved as non-competitive inhibitors. Docking analysis predicted that all three thielavins and acarbose bind to homologated αGHBs and to αGHY (PDB: 3A4A) in a pocket close to the catalytic site for maltose and isomaltose, respectively. The α-glucosidase inhibitory properties of thielavin K (3) were corroborated in vivo since it induced a noted antihyperglycemic action during an oral sucrose tolerance test (3.1, 10.0 and 31.6mg/kg) in normal and nicotinamide-streptozotocin diabetic mice. In addition, at a dose of 10mg/kg, it provoked a moderate hypoglycemic activity in diabetic mice.
Phytochemistry, 2013
An extract of the solid cultures of Sporormiella minimoides (Sporormiaceae) isolated as an endoph... more An extract of the solid cultures of Sporormiella minimoides (Sporormiaceae) isolated as an endophytic fungus from Hintonia latiflora (Rubiaceae), yielded three polyketides, 3,6-dimethoxy-8-methyl-1H,6H-benzo[de]isochromene-1,9-dione, 3-hydroxy-1,6,10-trimethoxy-8-methyl-1H,3H-benzo[de]isochromen-9-one, and 5-hydroxy-2,7-dimethoxy-8-methylnaphthoquinone, along with three known compounds, corymbiferone, ziganein, and brocaenol B. Their structures were characterized by spectrometric and spectroscopic methods. So as to be consistent the literature reports, 3,6-dimethoxy-8-methyl-1H,6H-benzo[de]isochromene-1,9-dione and 3-hydroxy-1,6,10-trimethoxy-8-methyl-1H,3H-benzo[de]isochromen-9-one were given the trivial names of corymbiferone C and corymbiferan lactone E, respectively. All isolates were tested as potential human calmodulin (hCaM) inhibitors using the fluorescent biosensor hCaM V91C-mBBr, but only 5-hydroxy-2,7-dimethoxy-8-methylnaphthoquinone quenched significantly the extrinsic fluorescence of this biosensor, with a dissociation constant (Kd) value of 1.55 μM. Refined docking analysis predicted that 5-hydroxy-2,7-dimethoxy-8-methylnaphthoquinone could also be bound to hCaM at site I displaying hydrophobic interactions with Phe19 and 68, Met51, 71, and 72, and Ile52 and 63 residues.
Physiologia Plantarum, 2009
In response to suboptimal temperatures, temperate annual plants often increase root:shoot ratios,... more In response to suboptimal temperatures, temperate annual plants often increase root:shoot ratios, build-up carbohydrates and display typical morphological and anatomical changes. We know less about the responses of biennials such as carrot. As a model plant, carrot has the additional feature of two functionally and morphologically distinct root parts: the taproot, which stores carbohydrate and other compounds, and the fibrous root system involved in acquisition of water and nutrients. Here, we analyze the effects of temperature (12 vs 25 • C) on growth, carbohydrate accumulation and wholeplant morphology in two carrot cultivars. Our working hypothesis is that suboptimal temperature favors active formation of reserve structures, rather than passive accumulation of storage carbohydrates. In comparison with plants grown at 25 • C, plants grown at 12 • C had: (1) higher fibrous root:shoot ratio (13%) , (2) thicker (10-15%) and smaller (up to two-to three-fold) leaves, (3) lower leaf cuticular permeance (two-to four-fold), (4) higher taproot:shoot ratio (two-fold), (5) higher phloem:xylem ratios in taproot (two-to six-fold), (6) unchanged percentage dry matter content (%DMC) in leaves, petioles or fibrous roots and (7) higher %DMC in taproot (20%). However, %DMC of individual taproot tissues (phloem and xylem) was unaffected by temperatures and was consistently higher in the phloem (up to 30%). Therefore, the higher %DMC of whole taproots at 12 • C was attributed solely to the increased development of phloem tissue. Carrot, therefore, shares many of the most conspicuous elements of temperate plant responses to low temperatures. Consistently with our hypothesis, however, carrots grown at suboptimal temperature promoted reserve structures, rather than the increase in carbohydrate concentration typical of most temperate annual species and woody perennials.
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Papers by Mariana Gonzalez