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Pulmonary embolism versus pulmonary vasculitis in Hughes-Stovin syndrome: Characteristic computed tomography pulmonary angiographic findings and diagnostic and therapeutic implications. HSS International Study Group. Thromb Res 2024; 239:109040. [PMID: 38795561 DOI: 10.1016/j.thromres.2024.109040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Revised: 05/11/2024] [Accepted: 05/21/2024] [Indexed: 05/28/2024]
Abstract
BACKGROUND AND AIM Hughes-Stovin syndrome (HSS) is a rare systemic vasculitis with widespread venous/arterial thrombosis and pulmonary vasculitis. Distinguishing between pulmonary embolism (PE) and in-situ thrombosis in the early stages of HSS is challenging. The aim of the study is to compare clinical, laboratory, and computed tomography pulmonary angiography (CTPA) characteristics in patients diagnosed with PE versus those with HSS. METHODS This retrospective study included 40 HSS patients with complete CTPA studies available, previously published by the HSS study group, and 50 patients diagnosed with PE from a single center. Demographics, clinical and laboratory findings, vascular thrombotic events, were compared between both groups. The CTPA findings were reviewed, with emphasis on the distribution, adherence to the mural wall, pulmonary infarction, ground glass opacification, and intra-alveolar hemorrhage. Pulmonary artery aneurysms (PAAs) in HSS were assessed and classified. RESULTS The mean age of HSS patients was 35 ± 12.3 years, in PE 58.4 ± 17 (p < 0.0001). Among PE 39(78 %) had co-morbidities, among HSS none. In contrast to PE, in HSS both major venous and arterial thrombotic events are seen.. Various patterns of PAAs were observed in the HSS group, which were entirely absent in PE. Parenchymal hemorrhage was also more frequent in HSS compared to PE (P < 0.001). CONCLUSION Major vascular thrombosis with arterial aneurysms formation are characteristic of HSS. PE typically appear loosely-adherent and mobile whereas "in-situ thrombosis" seen in HSS is tightly-adherent to the mural wall. Mural wall enhancement and PAAs are distinctive pulmonary findings in HSS. The latter findings have significant therapeutic ramifications.
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POS1285 IMMUNOGENICITY AND SAFETY OF THE CHADOX 1 COVID-19 VACCINE IN PATIENTS WITH AUTOIMMUNE DISEASES AND HEALTHY CONTROLS: DATA FROM SAFER STUDY. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.5319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BackgroundPatients with autoimmune inflammatory diseases (AID) have been prioritized for urgent vaccination to mitigate COVID-19 risk. However, few studies in the literature assessed the immunogenicity and safety of the COVID-19 vaccine in patients with AID.ObjectivesIn this context, the present study aims to evaluate the immunogenicity and safety of the vaccine against COVID-19 in patients with AID.MethodsThese data are from “Safety and efficacy on COVID-19 Vaccine in Rheumatic Disease” - SAFER study, a Brazilian multicentric prospective phase IV study to evaluate COVID-19 Vaccine in AID, in the real-life, in Brazil. Immunogenicity and adverse events (AE) from a single center were assessed, after 2 doses of ChAdOx1 (Oxford/AstraZeneca), 8 weeks of interval, in patients with AID and healthy controls (HC). Inclusion criteria were age ≥ 18 years and fulfilling criteria according to international classification for AID. Exclusion criteria: pregnancy, previous severe AE to any vaccine, other immunosuppression causes. Stratification of post-vaccination AE was performed using a diary, filled out daily and returned at the end of 28 days for each dose. Participants were followed up through blood collection for measurement of IgG antibodies against SARS-CoV-2 spike receptor-binding domain by chemiluminescence (SARS-CoV-2 IgG II Quant assay, Abbott Laboratories, Abbott Park, IL, USA) at baseline and 28 days after the second dose. The seropositivity was defined for titers ≥50 AU/mL. Quantitative analyses were presented as observed frequency, percentage, central tendency, and variability measurements. The sample’s normal distribution was verified through the Shapiro-Wilk test. The Kruskal-Wallis test and the post-hoc Dwass-Steel-Critchlow-Fligner pairwise comparisons test were used to compare the IgG-S titers between the groups through the evaluation period. Categorical data were addressed using the Fisher´s exact or Chi-squared (χ2) test. An alpha level of 5% significance was used in all analyses.ResultsA total of 377 volunteers with AID and 50 HC were included in the study. Patients with spondyloarthritis (N=64), systemic lupus erythematosus (N=63), rheumatoid arthritis (N=61), primary Sjögren’s syndrome (N=61), vasculitis (N=31), systemic sclerosis (N=14), inflammatory myopathy (N=9), Crohn´s disease (N=49), ulcerative colitis (N=11) and other systemics AID (N=12) were evaluated. Both groups had female predominance (73.5% vs. 74.0%, p=0.937) and were homogeneous for age (43.5 vs. 41.7,p=0.308). The seroconversion among those not reactive (IgG-S negative at baseline) (46 HC and 191 AID), 28 days after second dose was 97.1% for spondyloarthritis (p=0.425), systemic lupus erythematosus 88.2% (0.006), rheumatoid arthritis 93.5% (0.158), primary Sjögren’s syndrome 92.6% (0.133), systemic sclerosis or inflammatory myopathy 47.1% (0.001), inflammatory bowel disease 100% (0.999) and vasculitis 80% (0.006), while in healthy control was 100%. In comparison with HC, there was a statistically significant difference in IgG-S titles only in systemic sclerosis or inflammatory myopathy (1.694 AU/ml vs. 3.719 AU/ml; p=0.006). Both groups only presented mild AE. Pain at the injection (85.7% vs. 78.4%, p=0.239), headache (67.3% vs. 53.8, p=0.074) and fatigue (59.2% Vs. 46.2%, p=0.089) were more common in HC than AID. Overall, reactions like arthralgia (52.6 vs. 22.4%, p<0.001), hematoma (14.1 vs. 4.1%, p=0.05), cutaneous rash (9.5 vs. 0%, p=0.024) were more frequent in AID. Most participants related that they felt safer after receiving a COVID-19 vaccination, and 52.4% did not reported a worse patient global assessment (PGA) index.ConclusionIn conclusion, our data indicated that ChAdOx1 vaccine is safe and induced high titers and seroconversion rate in AID. More severe AID, such as vasculitis, systemic lupus erythematosous, and systemic sclerosis and myositis showed a lower seroconversion rate. Further analysis will explore the association between immunossupressant and reactivity, and booster dose.AcknowledgementsAcknowledgements to DECIT/MS and ICEPI/SESA for supporting the study.Disclosure of InterestsNone declared
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121 Characterization of different immortalized keratinocyte cell lines as models for epidermal differentiation studies. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.08.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Pulmonary vasculitis in Hughes-Stovin syndrome (HSS): a reference atlas and computed tomography pulmonary angiography guide-a report by the HSS International Study Group. Clin Rheumatol 2021; 40:4993-5008. [PMID: 34533671 PMCID: PMC8599253 DOI: 10.1007/s10067-021-05912-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 08/11/2021] [Accepted: 09/02/2021] [Indexed: 11/23/2022]
Abstract
Introduction Hughes-Stovin syndrome (HSS) is a systemic vasculitis characterized by widespread venous/arterial thrombosis and pulmonary artery aneurysms (PAAs), which is associated with serious morbidity and mortality. All fatalities reported in HSS resulted from unpredictable fatal suffocating hemoptysis. Therefore, it is necessary to recognize pulmonary complications at an early stage of the disease. Objectives The aims of this study are to develop a reference atlas of images depicting the characteristic features of HSS by computed tomography pulmonary angiography (CTPA). To make a guide for physicians by developing a classification of PAAs according to the severity and risk of complications associated with each distinct lesion type. Methods The Members of the HSS International Study Group (HSSISG) collected 42 cases, with high-quality CTPA images in one radiology station and made reconstructions from the source images. These detailed CTPA studies were reviewed for final image selection and approved by HSSISG board members. We classified these findings according to the clinical course of the patients. Results This atlas describes the CTPA images that best define the wide spectrum of pulmonary vasculitis observed in HSS. Pulmonary aneurysms were classified into six radiographic patterns: from true stable PAA with adherent in-situ thrombosis to unstable leaking PAA, BAA and/or PAP with loss of aneurysmal wall definition (most prone to rupture), also CTPA images demonstrating right ventricular strain and intracardiac thrombosis. Conclusion The HSSISG reference atlas is a guide for physicians regarding the CTPA radiological findings, essential for early diagnosis and management of HSS-related pulmonary vasculitis.
Key Points • The Hughes-Stovin syndrome (HSS) is a systemic vasculitis characterized by extensive vascular thrombosis and pulmonary artery aneurysms (PAAs) that can lead to significant morbidity and mortality. • All fatalities reported in HSS were related to unpredictable massive hemoptysis; therefore, it is critical to recognize pulmonary complications at an early stage of the disease. • The HSS International Study Group reference atlas classifies pulmonary vasculitis in HSS at 6 different stages of the disease process and defines the different radiological patterns of pulmonary vasculitis notably pulmonary artery aneurysms, as detected by computed tomography pulmonary angiography (CTPA). • The main aim of the classification is to make a guide for physicians about this rare syndrome. Such a scheme has never been reached before since the first description of the syndrome by Hughes and Stovin since 1959. This classification will form the basis for future recommendations regarding diagnosis and treatment of this syndrome. |
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Revisiting Polymer-Particle Interaction in PEO Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3808-3816. [PMID: 33764765 PMCID: PMC9132384 DOI: 10.1021/acs.langmuir.0c02715] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 03/17/2021] [Indexed: 06/12/2023]
Abstract
We have measured the electrophoretic mobility and diffusion coefficient of carboxylate-modified and sulfate-modified polystyrene latex particles in poly(ethylene oxide) aqueous solutions. Carboxylate-modified polystyrene particles have shown a bound polymeric layer as the surface net charge vanishes even at very low poly(ethylene oxide) concentration. The polymeric layer causes a lower electrophoretic mobility and slower Brownian diffusion than that corresponding to the bare particles. We show that the diffusion is the result of a significantly increased effective particle size 2rheff = 30 nm. This bound layer is not present in sulfate-modified polystyrene latex particles. The interaction between the carboxylate-modified particle surface and the macromolecules has been confirmed by means of atomistic computer simulations. The grafted acrylate copolymers, which come from the preparation procedure of the latex particles, confer more hydrophobic surface ready to interact with the polymer. The simulations suggest that the interaction is modulated not only by the nature of the acrylic acid monomer but also by the length of the grafted copolymer. Our results have important implications for particle selection in microrheology experiments.
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A critical analysis of 57 cases of Hughes-Stovin syndrome (HSS). A report by the HSS International Study Group (HSSISG). Int J Cardiol 2021; 331:221-229. [PMID: 33529654 DOI: 10.1016/j.ijcard.2021.01.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 01/09/2021] [Accepted: 01/15/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND Hughes-Stovin syndrome (HSS) is a systemic disease characterized by widespread vascular thrombosis and pulmonary vasculitis with serious morbidity and mortality. The HSS International Study Group is a multidisciplinary taskforce aiming to study HSS, in order to generate consensus recommendations regarding diagnosis and treatment. METHODS We included 57 published cases of HSS (43 males) and collected data regarding: clinical presentation, associated complications, hemoptysis severity, laboratory and computed tomography pulmonary angiography (CTPA) findings, treatment modalities and cause of death. RESULTS At initial presentation, DVT was observed in 29(33.3 %), thrombophlebitis in 3(5.3%), hemoptysis in 24(42.1%), and diplopia and seizures in 1 patient each. During the course of disease, DVT occurred in 48(84.2%) patients, and superficial thrombophlebitis was observed in 29(50.9%). Hemoptysis occurred in 53(93.0%) patients and was fatal in 12(21.1%). Pulmonary artery (PA) aneurysms (PAAs) were bilateral in 53(93%) patients. PAA were located within the main PA in 11(19.3%), lobar in 50(87.7%), interlobar in 13(22.8%) and segmental in 42(73.7%). Fatal outcomes were more common in patients with inferior vena cava thrombosis (p = 0.039) and ruptured PAAs (p < 0.001). Death was less common in patients treated with corticosteroids (p < 0.001), cyclophosphamide (p < 0.008), azathioprine (p < 0.008), combined immune modulators (p < 0.001). No patients had uveitis; 6(10.5%) had genital ulcers and 11(19.3%) had oral ulcers. CONCLUSIONS HSS may lead to serious morbidity and mortality if left untreated. PAAs, adherent in-situ thrombosis and aneurysmal wall enhancement are characteristic CTPA signs of HSS pulmonary vasculitis. Combined immune modulators contribute to favorable outcomes.
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Cervical cancer screening information flow in Northern regional administrative service in Portugal. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa166.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Management of a population-based screening program circuit depends on characteristics and technical barriers of its application and implementation. The aim is to clarify the information flow, to understand and build a vision of cervical screening information flows in Northern Regional Health Administration Portuguese Public System and to identify the constraints among them. A total of 5 cluster meetings were presented and two expert interviews were conducted allowing to present an informational flow and its constraints. Aims addressed in each interview where based on the expertise of the interviewed. Cervical cancer screening program depends on the use of SiiMA application. This is an information system for the management of population-based screening program which involves mainly 3 entities and allows a longitudinal data collection and study. Three main constraints were reported. The time for updating data for the list of eligible women was bigger than accorded reaching up to 3 months delay. A duplicate of records and discharges in hospital care since the discharge was done both in the hospital system and the SiiMA platform manually in order to the woman re-enter the screening program. Pendencies were seen due to other screening programs running in parallel which had to be sorted out manually in the regional level or by the entity involved. The existence of a screening application is vital for the implementation purposes of a screening program. The lack of integration of the systems increases bureaucratic work, costs and causes time delay. To improve the efficiency of digital transformation ensuring the quality of the process it is necessary to adapt the design of the health informatic systems to the daily practice and its wants and needs. The strategies of forcing an ever-increasing number of frameworks have demonstrated not to be so effective. Therefore, it is a cornerstone to understand these flows in order to improve its structure, intervention and optimization.
Key messages
The existence of a screening digital application is vital but its expanding use arises constraints. Due to the complexity of such programs, a digital strategy is crucial for management and monitoring of the screening at this scale.
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FEASIBILITY AND PRELIMINARY OUTCOMES FROM A PILOTED AMERICAN INDIAN ELDER CREATIVE CULTURAL ARTS PROGRAM. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Bit1 is an essential regulator of myogenic differentiation. Development 2015. [DOI: 10.1242/dev.125765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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The Portuguese version of Addenbrooke’s Cognitive Examination–Revised (ACE-R) in the diagnosis of subcortical vascular dementia and Alzheimer’s disease. AGING NEUROPSYCHOLOGY AND COGNITION 2014; 22:473-85. [DOI: 10.1080/13825585.2014.984652] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Oral Abstract session * New insights in heart muscle diseases: 13/12/2013, 16:30-18:00 * Location: Bursa. Eur Heart J Cardiovasc Imaging 2013. [DOI: 10.1093/ehjci/jet225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Nickel 2-Iminopyridine N-Oxide (PymNox) Complexes: Cationic Counterparts of Salicylaldiminate-Based Neutral Ethylene Polymerization Catalysts. Organometallics 2008. [DOI: 10.1021/om800548y] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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A population-based study of drug resistance and transmission of tuberculosis in an urban community. Int J Tuberc Lung Dis 2005; 9:970-6. [PMID: 16158889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
SETTING A low-income neighborhood of Sao Paulo, Brazil. OBJECTIVE To determine the incidence, risk factors and transmission patterns of multidrug-resistant tuberculosis (MDR-TB). DESIGN Prospective longitudinal study of patients with pulmonary TB (PTB). METHODS Sputum culture-confirmed patients with PTB were recruited between March 2000 and May 2002. Bivariate and multivariate logistic regression analyses were performed to identify factors associated with MDR-TB. Mycobacterium tuberculosis isolates were tested for drug susceptibility and typed by IS6110-RFLP analysis. RESULTS Of 420 patients, respectively 71% and 27% were new and previously treated; 15.5% of the patients' M. tuberculosis isolates were resistant to at least one drug; of these, 11% and 27% were found among new and previously treated cases, respectively. Respectively 1% and 16.7% of the new and previously treated cases were MDR-TB. RFLP analysis showed that new transmission of MDR strains was uncommon. By multivariate logistic regression analysis, previous TB and hospitalization in the 24 months before TB diagnosis were identified as independent predictors of MDR-TB. CONCLUSIONS The results showed an intermediate level of MDR-TB incidence in a neighborhood of Sao Paulo and identified predictors that can be targeted for intervention by national and local TB control programs.
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An experimental and computational evaluation of ethylene/styrene copolymerization with a homogeneous single-site titanium(IV)-constrained geometry catalyst. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pola.20456] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Ethylene/styrene copolymerisation by homogeneous metallocene catalysts: experimental and molecular simulations using rac-ethylenebis(tetrahydroindenyl)MCl2 [M=Ti,Zr] systems. POLYMER 2004. [DOI: 10.1016/j.polymer.2004.10.059] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Preliminary experience comparing the efficiency of inhibitors of aromatase (Letrozole™) and clomiphene citrate (Serophene™) in controlled ovarian stimulation (COH) in a prospective clinical trial. Fertil Steril 2004. [DOI: 10.1016/j.fertnstert.2004.07.089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
The bacteriocin AS-48 is a membrane-interacting peptide, which displays a broad anti-microbial spectrum against Gram-positive and Gram-negative bacteria. The NMR structure of AS-48 at pH 3 has been solved. The analysis of this structure suggests that the mechanism of AS-48 anti-bacterial activity involves the accumulation of positively charged molecules at the membrane surface leading to a disruption of the membrane potential. Here, we report the high-resolution crystal structure of AS-48 and sedimentation equilibrium experiments showing that this bacteriocin is able to adopt different oligomeric structures according to the physicochemical environment. The analysis of these structures suggests a mechanism for molecular function of AS-48 involving a transition from a water-soluble form to a membrane-bound state upon membrane binding.
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DFT study of hydrogenolysis as a chain transfer mechanism in olefin polymerisation catalysed by nickel-diimine-type catalysts. POLYMER 2003. [DOI: 10.1016/s0032-3861(03)00057-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Cyclo-oxygenase inhibitor and interferon-γ act synergistically to reduce melanoma growth and improve survival in a murine model. Ir J Med Sci 2002. [DOI: 10.1007/bf03170085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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A computational study of iron-based Gibson–Brookhart catalysts for the copolymerisation of ethylene and 1-hexene. POLYMER 2002. [DOI: 10.1016/s0032-3861(02)00174-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ab initio study of ethylene insertion into M–C bonds of alkylamidinates complexes of group IV ({R′NCRNR′} 2 MCH 3 + , M=Zr, Ti, R=H, Ph and R′=H, SiMe 3 ). POLYMER 2001. [DOI: 10.1016/s0032-3861(01)00165-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Management of carotid coils during routine carotid endarterectomy. THE JOURNAL OF CARDIOVASCULAR SURGERY 2001; 42:365-8. [PMID: 11398034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
BACKGROUND A coil in the internal carotid artery (ICA), defined as a circular configuration or exaggerated S shape of the ICA, is occasionally encountered during endarterectomy for carotid bifurcation lesions. The significance of coils as an etiology for symptoms is difficult to determine. It is thought, however, that the failure to correct coils and kinks during routine carotid endarterectomy (CE) may lead to turbulence and failure of the CE. Various techniques have been discussed to repair coils. METHODS Our technique consisted of complete dissection of the coil, routine use of a Javid shunt, standard endarterectomy, resection of the redundant ICA, re-approximation of the posterior wall of the ICA and patch angioplasty of the anterior wall. Three hundred and fifteen patients underwent CE between August, 1998 and February, 2000. Fifteen patients (4.7%) had a carotid coil that was repaired. There were ten men and five women. Mean age was 72.6+/-6.1 years. Ten patients had an asymptomatic stenosis. Four patients had lateralizing symptoms and one patient had dizziness. Fifteen patients underwent preoperative duplex scanning and 14 of these patients had MRA scans performed. All patients had a preoperative stenosis of 80-99% by duplex on the operated side. The right carotid artery was repaired in 12 patients. The left in three patients. The length of resected artery varied from 1.2-2.8 cm (1.93+/-0.49 cm). RESULTS All patients survived surgery. One patient developed a cerebellar stroke on the third postoperative day. A postoperative carotid duplex scan demonstrated a widely patent repair. There were no cranial nerve injuries in this series. One patient died seven months after surgery from cardiac events with no follow-up duplex exam. There have been no long term strokes or anastomotic complications. Follow-up duplex scans demonstrated widely patent repairs (1-15% stenosis) in seven patients and low end 15-49% stenosis in five patients. CONCLUSIONS Resection of redundant ICA with re-anastomosis of the posterior wall and patch reconstruction of the anterior wall gives acceptable perioperative and long term results.
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Ab initio study of hydrogenolysis as a chain transfer mechanism in olefin polymerization catalyzed by metallocenes. POLYMER 2000. [DOI: 10.1016/s0032-3861(99)00827-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Effect of a second ethylene molecule on the insertion of ethylene in zirconocene catalyst systems: A QM semiempirical study. ACTA ACUST UNITED AC 2000. [DOI: 10.1002/(sici)1099-0518(20000201)38:3<571::aid-pola22>3.0.co;2-g] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Thyroid hormones and cytogenetic outcomes in backpack sprayers using ethylenebis(dithiocarbamate) (EBDC) fungicides in Mexico. ENVIRONMENTAL HEALTH PERSPECTIVES 1997; 105:1126-30. [PMID: 9349837 PMCID: PMC1470391 DOI: 10.1289/ehp.971051126] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Ethylenebis(dithiocarbamate) (EBDC) fungicides are used heavily in the United States. EBDCs (e.g., mancozeb, maneb) are metabolized to ethylene thiourea (ETU). The EPA classifies ETU as a carcinogen, based on thyroid and other cancers in rodents, and has restricted the use of EBDCs, while requiring workers to use protective equipment. There are no data on the potential carcinogenicity of EBDCs in humans, and there is only one study on human genotoxicity. ETU is known to cause decreases of thyroxine (T4) and increases in thyroid-stimulating hormone (TSH) in rodents. We have studied cytogenetic outcomes and serum thyroid hormone levels among 49 heavily exposed workers without protective equipment spraying EBDC on tomatoes in Mexico. We also studied 14 lightly exposed landowners and 31 nonexposed controls. Urinary ETU was used to compare exposure between groups. We found an increase in TSH (p = 0.05) among applicators compared to controls, but no decrease in thyroid hormone (T4). We found increases in sister chromatid exchange (p = 0.03) and in chromosome translocations (chromosome aberrations that persist through cell division) for applicators compared to controls (p = 0.05). However, the subset of reciprocal translocations showed a lesser increase (p = 0.24). Our data suggest that EBDCs affect the thyroid gland and the lymphocyte genome among heavily exposed workers. However, our data are limited to subclinical outcomes, are of borderline statistical significance, and should be interpreted with caution.
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Abstract
The purpose of this research utilization project was to select and implement a research-based Restraint Education Program for reducing the use of restraints in an acute care setting by changing the perception of the restraint coordinators about restraints in the direction of decreased importance. The Iowa Model, Research Based Practice to Promote Quality Care (Titler et al., 1994) was selected to guide the change process. A multidisciplinary team reviewed the restraint policy and procedure, new restraint products and alternative restraint methods. After a review of the literature on restraint education programs, the committee concluded that education was the key component in decreasing the use of physical restraints. The research-based Restraint Education Program developed by Drs. Strumpf and Evans was selected as the educational program. Education sessions were developed and a pilot study was conducted with the restraint coordinators. The Perceptions of Restraint Use Questionnaire (PRUQ) (Strumpf & Evans, 1988) was administered before and after the education sessions. The results of the t-test showed a decrease in the post-test mean scores on 7 of the 17 items indicating a less important perception by the staff about the use of restraints. Four items had an increase in mean scores on the post-test indicating the restraint coordinators increased their perception of the importance of physical restraints with these items. The restraint education program was presented to the nursing staff throughout the institution. Risk management and quality assurance will monitor patients restrained and evaluate the nursing staff with the PRUQ in 3 months.
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Exposure assessment for workers applying DDT to control malaria in Veracruz, Mexico. ENVIRONMENTAL HEALTH PERSPECTIVES 1997; 105:98-101. [PMID: 9074888 PMCID: PMC1469828 DOI: 10.1289/ehp.9710598] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
DDT has systematically been used in sanitation campaigns against malaria in Mexico. To assess chronic occupational exposure, we studied a group of workers dedicated to spraying houses to control malaria vectors in the state of Veracruz. Exposure was directly estimated for a subgroup of 40 workers by measuring DDT metabolites in adipose tissue samples and indirectly estimated for 331 workers by using a questionnaire to determine their occupational history. Participants ranged in age from 20 to 70 years, and 80% of the workers had been employed in the sanitation campaign for at least 20 years. The mean concentrations of extractable lipids found in adipose tissue samples were as follows: total DDT, 104.48 micrograms/g; p,p'-DDE, 60.98 micrograms/g; p,p'-DDT, 31.0 micrograms/g; o,p'-DDT, 2.10 micrograms/g; and p,p'-DDD, 0.95 microgram/g. The DDT metabolite p,p'-DDE was selected as the indicator of chronic exposure. An index of chronic occupational exposure was constructed according to worker position and based on the historical duration and intensity of DDT application. A linear model including this index, the use of protective gear, and recent weight loss explained 55% of the variation of p,p'-DDE concentrations in adipose tissue. By this model, the predicted values of p,p'-DDE concentration in adipose tissue for the 331 workers are between 9.56 micrograms/g and 298.4 micrograms/g of fat, with a geometric mean of 67.41 micrograms/g. These high levels of DDT in adipose tissue call for exposure prevention programs and the promotion of more secure application measures and hygiene. We also discuss the use of indirect measures of DDT exposure in epidemiological studies of health effects.
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Distribution and diffusivity of a hydrophobic probe molecule in the interior of a membrane: theory and simulation. Biophys J 1996; 71:1428-39. [PMID: 8874017 PMCID: PMC1233610 DOI: 10.1016/s0006-3495(96)79344-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
We propose a simple model for the distribution of position and orientation and the diffusion of a hydrophobic probe molecule embedded in a membrane. The molecule experiences both a Maier-Saupe orienting potential as well as an enclosing potential of repulsion from the membrane walls. A statistical thermodynamics treatment of the model provides predictions of the location and orientation of the molecule within the membrane. In particular, we evaluate the order parameter of the molecule in terms of the model constants. The diffusivity of the probe is studied by Brownian dynamics simulation. For rotational diffusion, we check an available analytical approximate treatment that allows for the prediction of the dynamics in terms of equilibrium quantities. We also pay attention to quantities related to the initial and mean reorientational rate of the probe. For translational diffusion, we use the simulation results to analyze some general aspects of lateral and transversal diffusion.
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Abstract
RATIONALE AND OBJECTIVES We determined whether computed radiographs in an adult intensive care unit produce greater agreement between readers in descriptions of radiologic findings and interval changes. METHODS Fifty-six conventional radiographs and 56 computed radiographs were obtained on 28 patients. Computed and conventional radiographs were imaged simultaneously in a single exposure with the use of a sandwich cassette. The two sets of films per patient were taken less than 1 week apart. RESULTS Four readers evaluated the chest films and judged interval changes with the use of standardized confidence scales. Overall exposure and film quality also were evaluated. Computed radiographs were rated better in overall quality. Tubes and lines were detected with comparable accuracy. Interobserver agreement in the evaluation of radiologic descriptors was generally greater with computed radiographs (intraclass correlation). No differences were noted in interobserver agreement in the judgment of interval changes. CONCLUSIONS The diagnostic usefulness of computed radiography is comparable to conventional films in the intensive care unit. The higher interobserver agreement rate for radiologic descriptors with computed radiography is an added advantage of the system.
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[A single coronary vessel in the mouse: a model for experimental study]. Rev Esp Cardiol 1985; 38:260-4. [PMID: 4048617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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CT of gastric masses: image patterns and a note on potential pitfalls. GASTROINTESTINAL RADIOLOGY 1983; 8:11-7. [PMID: 6601036 DOI: 10.1007/bf01948080] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Computed tomography (CT) was performed in 9 consecutive cases of primary gastric neoplasm. Lesions were surgically or endoscopically proved; cross-sectional images are correlated to specific histopathology in each case. The CT images of leiomyoma and leiomyoblastoma are characterized as models of pure bulging intramural growth resulting in a lunate contrast distribution when imaged in the cross-sectional plane. In 5 cases of lymphoma, distortion of the contrast-filled hollow viscus is relatively consistent. Nodular growth is reflected on the CT image as a series of digitations encroaching on the opacified portion of the gastric lumen. Image pattern recognition, relative to histopathology, is of more than academic interest since endoscopy is frequently unreliable in cases of submucosal and exophytic pathology. Further, biopsy of such lesions is commonly nondiagnostic as a result of random choice of biopsy site or inadequate depth of tissue sample. Additionally, this report includes images of lesions that simulate the primary gastric pathology and may be a source of erroneous interpretation. These include: pseudocyst of the pancreas (2 cases) and enlargement of the left lobe of the liver with encroachment on the gastric lumen (1 case). Image specificity on CT examination is increasingly essential to diagnosis and surgical planning.
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Computed tomography in ileofemoral venous thrombosis: extension to inferior vena cava defined with foot vein infusion. J Comput Assist Tomogr 1981; 5:375-7. [PMID: 7240514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Two cases of ileofemoral venous thrombosis and occlusion are presented in which cephalad extension of venous thrombosis to the inferior vena cava (IVC) is demonstrated on computed tomography (CT). Proximal venous obstruction does not diminish the utility of foot vein infusion simultaneous with the CT study. Delineation of intraluminal thrombosis in the IVC is excellent with good definition of occluded and patent segments of the IVC.
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[Immune discs. New resources for the serological diagnosis of parasitic diseases]. SALUD PUBLICA DE MEXICO 1977; 19:735-41. [PMID: 98171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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