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  1. Article ; Online: Nonbacterial thrombotic endocarditis of mitral valve associated with a lymphoproliferative malignancy: case report and literature review.

    Duarte, Fabiana / Barradas, Maria Inês / Dias, Ana Raquel / Faria, Carlos / Machado, Carina / Pavão, Carolina

    Cardio-oncology (London, England)

    2024  Volume 10, Issue 1, Page(s) 25

    Abstract: Background: Non-bacterial thrombotic endocarditis (NBTE) is a rare condition marked by sterile vegetations on cardiac valves, often linked to rheumatologic diseases, autoimmune disorders, and advanced solid malignancies. An early diagnosis and treatment ...

    Abstract Background: Non-bacterial thrombotic endocarditis (NBTE) is a rare condition marked by sterile vegetations on cardiac valves, often linked to rheumatologic diseases, autoimmune disorders, and advanced solid malignancies. An early diagnosis and treatment of the associated clinical condition are mandatory, although they do not usually eliminate valvular vegetations, making anticoagulation essential to prevent embolic events. Despite variability, the prognosis of NBTE is usually unfavorable due to recurrent embolic events and the severity of the primary condition, typically advanced cancer.
    Case presentation: We present a case of a 57 years-old male who presented to the emergency department with a 5-day history of painful bilateral digital edema and color change episodes (from pallor to cyanosis). Physical examination revealed erythrocyanosis in the distal extremities, prompting consideration of secondary Raynaud syndrome. Despite medical therapy, progressive digital ischemia led to multiple finger amputations. During etiological investigation, anticoagulation tests and autoimmune analysis yielded negative results. A transesophageal echocardiogram was performed, revealing an irregular hyperechogenic mass on the anterior leaflet of the mitral valve without valve dysfunction, and a thoracic computed tomography scan with contrast showed an enlarged right paratracheal lymph node. Histopathological analysis from a transthoracic needle biopsy of the paratracheal lymph node revealed diffuse large B-cell lymphoma. The patient underwent aggressive R-CHOP chemotherapy, achieving a favorable complete response.
    Conclusion: This is a particular case involving the occurrence of NBTE and Raynaud phenomenon as the initial paraneoplastic manifestations in a previously healthy young man. Reports of NBTE associated with lymphoproliferative conditions are quite rare, with fewer than ten cases described in the literature. To our knowledge, this is the first case of NBTE specifically associated with diffuse large B-cell lymphoma.
    Language English
    Publishing date 2024-04-19
    Publishing country England
    Document type Journal Article
    ISSN 2057-3804
    ISSN (online) 2057-3804
    DOI 10.1186/s40959-024-00226-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Mitral Valve Endocarditis - An Unusual Culprit in a Cancer Patient.

    Duarte, Fabiana / Machado, Carina / Oliveira, Luis / Machado, Duarte / Dourado, Raquel

    Arquivos brasileiros de cardiologia

    2023  Volume 120, Issue 10, Page(s) e20230268

    Title translation Endocardite da Válvula Mitral – Uma Causa Rara num Doente com Neoplasia.
    MeSH term(s) Humans ; Mitral Valve/diagnostic imaging ; Mitral Valve/surgery ; Endocarditis/complications ; Endocarditis/diagnostic imaging ; Endocarditis/surgery ; Mitral Valve Insufficiency/surgery ; Neoplasms ; Endocarditis, Bacterial/complications ; Endocarditis, Bacterial/diagnostic imaging ; Heart Valve Prosthesis Implantation
    Language Portuguese
    Publishing date 2023-09-26
    Publishing country Brazil
    Document type Letter
    ZDB-ID 730261-7
    ISSN 1678-4170 ; 0066-782X
    ISSN (online) 1678-4170
    ISSN 0066-782X
    DOI 10.36660/abc.20230268
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Worrisome trends of ST-elevation myocardial infarction during the Covid-19 pandemic: Data from Portuguese centers.

    Oliveira, Luís / Campante Teles, Rui / Machado, Carina / Madeira, Sérgio / Vale, Nélson / Almeida, Carla / Brito, João / Leal, Sílvio / Raposo, Luís / de Araújo Gonçalves, Pedro / Pacheco, António Miguel / Mesquita Gabriel, Henrique / Almeida, Manuel / Martins, Dinis / Mendes, Miguel

    Revista portuguesa de cardiologia : orgao oficial da Sociedade Portuguesa de Cardiologia = Portuguese journal of cardiology : an official journal of the Portuguese Society of Cardiology

    2022  Volume 41, Issue 6, Page(s) 465–471

    Abstract: Introduction: During the Covid-19 pandemic there has been a general belief that hospital admissions for non-infectious causes, especially cardiovascular diseases, have fallen.: Objectives: To assess the impact of the pandemic on admissions for ST- ... ...

    Abstract Introduction: During the Covid-19 pandemic there has been a general belief that hospital admissions for non-infectious causes, especially cardiovascular diseases, have fallen.
    Objectives: To assess the impact of the pandemic on admissions for ST-elevation myocardial infarction (STEMI) during the first pandemic wave.
    Methods: We performed a multicenter retrospective analysis of consecutive patients presenting with STEMI in two Portuguese hospital centers in two sequential periods - P1 (March 1 to April 30) and P2 (May 1 to June 30). Patient's clinical data and hospital outcomes were compared between the years 2017 to 2019 and 2020 for both periods.
    Results: During P1 in 2020, a reduction in the number of STEMI patients was observed in comparison with previous years (26.0±4.2 vs. 16.5±4.9 cases per month; p=0.033), as well as an increase in the number of mechanical complications (0.0% vs. 3.0%; p=0.029). Percutaneous coronary interventions in the setting of failed thrombolysis were more frequent (1.9% vs. 9.1%; p=0.033). An overall trend for longer delays in key timings of STEMI care bundles was noted. Mortality was higher during P1 compared to previous years (1.9% vs. 12.1%; p=0.005).
    Conclusions: During the first Covid-19 wave fewer patients presented with STEMI at the catheterization laboratory for percutaneous coronary intervention. These patients presented more mechanical complications and higher mortality.
    Language English
    Publishing date 2022-02-17
    Publishing country Portugal
    Document type Journal Article
    ZDB-ID 632718-7
    ISSN 2174-2030 ; 0870-2551 ; 0304-4750
    ISSN (online) 2174-2030
    ISSN 0870-2551 ; 0304-4750
    DOI 10.1016/j.repc.2021.03.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Recycling of aluminum and caustic soda solution from waste effluents generated during the cleaning of the extruder matrixes of the aluminum industry

    Tansens, Pieter / Rodal, Alberto T / Machado, Carina M.M / Soares, Helena M.V.M

    Journal of hazardous materials. 2011 Mar. 15, v. 187, no. 1-3

    2011  

    Abstract: Anodising industries use a concentrated caustic soda solution to remove aluminum from extruder matrixes. This procedure produces very alkaline effluents containing high amounts of aluminum. The work reported here was focussed on recycling aluminum, as ... ...

    Abstract Anodising industries use a concentrated caustic soda solution to remove aluminum from extruder matrixes. This procedure produces very alkaline effluents containing high amounts of aluminum. The work reported here was focussed on recycling aluminum, as aluminum hydroxide, from these effluents and regenerating an alkaline sodium hydroxide solution. Briefly, the method comprises a dilution step (necessary for reducing the viscosity of the effluent and allowing the subsequent filtration) followed by a filtration to eliminate a substantial amount of the insoluble iron. Then, sulphuric acid was added to neutralize the waste solution down to pH 12 and induce aluminum precipitation. The purity of the aluminum salt was improved after washing the precipitate with deionised water. The characterization of the solid recovered, performed by thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray diffraction, indicated characteristics typical of bayerite. The proposal method allowed recovering 82% of the aluminum present in the wastewater with high purity (99.5%). Additionally, a sufficiently concentrated caustic soda solution was also recovered, which can be reused in the anodising industries. This procedure can be easily implemented and ensures economy by recycling reagents (concentrated caustic soda solution) and by recovering commercial by-products (aluminum hydroxide), while avoiding environmental pollution.
    Keywords Fourier transform infrared spectroscopy ; X-ray diffraction ; aluminum ; aluminum hydroxide ; byproducts ; cleaning ; effluents ; filtration ; industry ; iron ; neutralization ; pH ; recycling ; sodium hydroxide ; sulfuric acid ; thermogravimetry ; viscosity ; washing ; wastewater
    Language English
    Dates of publication 2011-0315
    Size p. 459-465.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2011.01.048
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Challenges in modelling and optimisation of stability constants in the study of Cu-(TAPS)(x)-(OH)(y) system by polarography.

    Machado, Carina M M / Soares, Helena M V M

    Talanta

    2007  Volume 71, Issue 3, Page(s) 1352–1363

    Abstract: This work describes the application of polarography, a technique scarcely used for modelling and optimisation of stability constants, in the study of copper complexes with [(2-hydroxy-1,1-bis(hydroxymethyl)ethyl)amino]-1-propanesulfonic acid (TAPS). ... ...

    Abstract This work describes the application of polarography, a technique scarcely used for modelling and optimisation of stability constants, in the study of copper complexes with [(2-hydroxy-1,1-bis(hydroxymethyl)ethyl)amino]-1-propanesulfonic acid (TAPS). Direct current polarography (DCP), using low total copper ion and large total ligand to total copper concentration, enabled the full characterization of Cu-(TAPS)(x)-(OH)(y) system, whose complexation occurs in the pH range of copper hydrolysis and Cu(OH)(2) precipitation. Cu-(TAPS)(x)-(OH)(y) system was studied by DCP and glass electrode potentiometry (GEP) in aqueous solution at fixed total ligand to total metal concentrations ratios and varied pH values (25.0 degrees C; I=0.1M, KNO(3)). The predicted model, as well as the overall stability constants values, are (as logbeta): CuL(+)=4.2, CuL(2)=7.8, CuL(2)(OH)(-)=13.9 and CuL(2)(OH)(2)(2-)=18.94. GEP only allowed confirming the stability constants for CuL(+) and CuL(2) and was used to determine the pK(a) of TAPS, 8.342. Finally, a briefly comparative analysis between TAPS and other structural related buffers was done. Evaluation based on logbeta(CuL) versus pK(a) revealed that TES, TRIS, TAPS and AMPSO coordinated via amino and hydroxymethylgroups forming a five-membered chelate ring. For BIS-TRIS and TAPSO, and possibly DIPSO, one or more five-membered chelate rings involving additional hydroxyl groups are also likely formed.
    Language English
    Publishing date 2007-02-28
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2006.07.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Endocardite a Streptococcus agalactiae.

    Machado, Carina / Almeida, Carla / Santos, Emília / Pelicano, Nuno / Dourado, Raquel / Martins, Dinis

    Revista portuguesa de cardiologia : orgao oficial da Sociedade Portuguesa de Cardiologia = Portuguese journal of cardiology : an official journal of the Portuguese Society of Cardiology

    2012  Volume 31, Issue 9, Page(s) 619–621

    Abstract: Streptococcus agalactiae endocarditis is a rare clinical entity that is generally characterized by acute onset, the presence of large vegetations, rapid valvular destruction and frequent complications, particularly embolization. Mortality is high with ... ...

    Title translation Streptococcus agalactiae endocarditis.
    Abstract Streptococcus agalactiae endocarditis is a rare clinical entity that is generally characterized by acute onset, the presence of large vegetations, rapid valvular destruction and frequent complications, particularly embolization. Mortality is high with medical therapy alone. The authors present a case report of Streptococcus agalactiae endocarditis in a young patient treated by prompt surgery. The literature is reviewed.
    MeSH term(s) Endocarditis, Bacterial/diagnosis ; Endocarditis, Bacterial/microbiology ; Female ; Humans ; Streptococcal Infections/diagnosis ; Streptococcus agalactiae ; Young Adult
    Language Portuguese
    Publishing date 2012-09
    Publishing country Portugal
    Document type Case Reports ; English Abstract ; Journal Article
    ZDB-ID 632718-7
    ISSN 0870-2551 ; 0304-4750
    ISSN 0870-2551 ; 0304-4750
    DOI 10.1016/j.repc.2012.01.017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Recycling of aluminum and caustic soda solution from waste effluents generated during the cleaning of the extruder matrixes of the aluminum industry.

    Tansens, Pieter / Rodal, Alberto T / Machado, Carina M M / Soares, Helena M V M

    Journal of hazardous materials

    2011  Volume 187, Issue 1-3, Page(s) 459–465

    Abstract: Anodising industries use a concentrated caustic soda solution to remove aluminum from extruder matrixes. This procedure produces very alkaline effluents containing high amounts of aluminum. The work reported here was focussed on recycling aluminum, as ... ...

    Abstract Anodising industries use a concentrated caustic soda solution to remove aluminum from extruder matrixes. This procedure produces very alkaline effluents containing high amounts of aluminum. The work reported here was focussed on recycling aluminum, as aluminum hydroxide, from these effluents and regenerating an alkaline sodium hydroxide solution. Briefly, the method comprises a dilution step (necessary for reducing the viscosity of the effluent and allowing the subsequent filtration) followed by a filtration to eliminate a substantial amount of the insoluble iron. Then, sulphuric acid was added to neutralize the waste solution down to pH 12 and induce aluminum precipitation. The purity of the aluminum salt was improved after washing the precipitate with deionised water. The characterization of the solid recovered, performed by thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray diffraction, indicated characteristics typical of bayerite. The proposal method allowed recovering 82% of the aluminum present in the wastewater with high purity (99.5%). Additionally, a sufficiently concentrated caustic soda solution was also recovered, which can be reused in the anodising industries. This procedure can be easily implemented and ensures economy by recycling reagents (concentrated caustic soda solution) and by recovering commercial by-products (aluminum hydroxide), while avoiding environmental pollution.
    MeSH term(s) Aluminum/chemistry ; Chemical Industry ; Conservation of Natural Resources ; Sodium Hydroxide/chemistry ; Spectroscopy, Fourier Transform Infrared ; Thermogravimetry ; X-Ray Diffraction
    Chemical Substances Sodium Hydroxide (55X04QC32I) ; Aluminum (CPD4NFA903)
    Language English
    Publishing date 2011-03-15
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2011.01.048
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Modelling of Pb-(TAPS)(x)-(OH)(y) system and refinement of stability constants in the region of lead hydrolysis and lead hydroxide precipitation.

    Machado, Carina M M / Victoor, Olle / Soares, Helena M V M

    Talanta

    2007  Volume 71, Issue 3, Page(s) 1326–1332

    Abstract: The influence of [(2-hydroxy-1,1-bis(hydroxymethyl)ethyl)amino]-1-propanesulfonic acid (TAPS) on solutions containing lead(II) was studied by direct current polarography (DCP) and glass electrode potentiometry (GEP). The readings were taken at fixed ... ...

    Abstract The influence of [(2-hydroxy-1,1-bis(hydroxymethyl)ethyl)amino]-1-propanesulfonic acid (TAPS) on solutions containing lead(II) was studied by direct current polarography (DCP) and glass electrode potentiometry (GEP). The readings were taken at fixed total TAPS to total lead(II) concentration ratios and various pH values, at 25.0+/-0.1 degrees C and ionic strength 0.1M KNO(3). Due to the basic pK(a) of the ligand, which occurs in the pH range where large amount of lead polynuclear species are formed, and the occurrence of ligand adsorption, that disabled the use of high concentrations of TAPS on DCP experiments, GEP and DCP experimental conditions were put to the limit in order to provide the correct Pb-TAPS-OH model and reliable stability constants. The proposed final model is: PbL, PbL(2), PbL(2)(OH) and PbL(2)(OH)(2) with overall stability constants values, as logbeta, 3.27+/-0.06, 6.5+/-0.1, 12.7+/-0.1 and 17.27+/-0.06, respectively. A comparative analysis of the strength of complexation of TAPS and a structural related buffer, 2-hydroxy-3-[tris(hydroxymethyl)methylamino]-1-propanesulfonic acid (TAPSO), with lead is also discussed.
    Language English
    Publishing date 2007-02-28
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2006.07.016
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Coronary-subclavian steal syndrome: percutaneous approach.

    Machado, Carina / Raposo, Luís / Leal, Sílvio / Gonçalves, Pedro Araújo / Mesquita Gabriel, Henrique / Teles, Rui Campante / Almeida, Manuel Sousa / Mendes, Miguel

    Case reports in cardiology

    2013  Volume 2013, Page(s) 757423

    Abstract: Coronary subclavian steal syndrome is a rare ischemic cause in patients after myocardial revascularization surgery. Subclavian artery stenosis or compression proximal to the internal mammary artery graft is the underlying cause. The authors present a ... ...

    Abstract Coronary subclavian steal syndrome is a rare ischemic cause in patients after myocardial revascularization surgery. Subclavian artery stenosis or compression proximal to the internal mammary artery graft is the underlying cause. The authors present a clinical case of a patient with previous history of non-ST elevation myocardial infarction, triple coronary bypass, and effort angina since the surgery, with a positive ischemic test. Coronary angiography revealed a significant stenosis of the left subclavian artery, proximal to the internal mammary graft.
    Language English
    Publishing date 2013-07-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2627627-6
    ISSN 2090-6412 ; 2090-6404
    ISSN (online) 2090-6412
    ISSN 2090-6404
    DOI 10.1155/2013/757423
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Interpretation of non-Nernstian slopes in graphic analysis of data collected in pH range close to deprotonation of a ligand Part I. A glass electrode potentiometric and polarographic study of Cd-(TAPSO)x-(OH)y and Zn-(TAPSO)x-(OH)y systems.

    Machado, Carina M M / Cukrowski, Ignacy / Soares, Helena M V M

    Talanta

    2006  Volume 68, Issue 3, Page(s) 819–830

    Abstract: In this work, the complexation of cadmium and zinc ions by 3-[N-tris(hydroxymethyl)methylamine]-2-hydroxypropanesulfonic acid (TAPSO), a commercial biological buffer, was evaluated using three electrochemical techniques, at fixed total-ligand and total- ... ...

    Abstract In this work, the complexation of cadmium and zinc ions by 3-[N-tris(hydroxymethyl)methylamine]-2-hydroxypropanesulfonic acid (TAPSO), a commercial biological buffer, was evaluated using three electrochemical techniques, at fixed total-ligand and total-metal concentration ratio and varied pH, at 25.0+/-0.1 degrees C and ionic strength set to 0.1M KNO(3). For both metal-ligand systems, complexation was evidenced in the pH range close to deprotonation of the ligand and the final models were optimised after a meticulous graphical analysis. For Cd-(TAPSO)(x)-(OH)(y) system, two complexes, CdL and CdL(2), were identified in the buffering region of the ligand. The proposed final model for this system is: CdL, CdL(2) and CdL(2)(OH) with stability constants, as logbeta, of 2.2, 4.2 and 8.6, respectively. For Zn-(TAPSO)(x)-(OH)(y) system, the complex ZnL is the main species formed in the buffering pH range. The proposed final model is ZnL, ZnL(OH) and ZnL(OH)(2) with overall refined stability constants (as logbeta) to be: 2.5, 7.2 and 13.2, respectively.
    Language English
    Publishing date 2006-01-15
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2005.06.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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