Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 19 de 19
Filter
1.
Rev. bras. cir. cardiovasc ; 34(5): 618-623, Sept.-Oct. 2019. tab, graf
Article in English | LILACS | ID: biblio-1042033

ABSTRACT

Abstract In aortic valve disease cases, prosthetic valves have been used for valve replacement, however, these prostheses have inherent problems, and their quality in some countries is lower comparing to new-generation models, causing shorter durability. Aortic valve neocuspidization (AVNeo) has emerged as an option, which can be applied to a wide spectrum of these diseases. Despite the promising results, this procedure is not widely spread among cardiac surgeons yet. We developed a surgical technique combining Bentall and Ozaki procedures to treat patients with concomitant ascending aorta replacement and AVNeo and we describe it in this paper.


Subject(s)
Humans , Aorta/surgery , Aortic Valve/surgery , Prosthesis Design/standards , Heart Valve Prosthesis/standards , Heart Valve Prosthesis Implantation/methods , Heart Valve Diseases/surgery , Reproducibility of Results , Medical Illustration
2.
Arq. bras. cardiol ; 112(3): 292-301, Mar. 2019. tab, graf
Article in English | LILACS | ID: biblio-989329

ABSTRACT

Abstract Background: The choice of a mechanical (MP) or biological prosthesis (BP) for patients with valvular heart disease undergoing replacement is still not a consensus. Objective: We aimed to determine the clinical outcomes of MP or BP placement in those patients. Methods: We conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) that compared biological prostheses and mechanical prostheses in patients with valvular heart diseases and assessed the outcomes. RCTs were searched in the MEDLINE, EMBASE, LILACS, CENTRAL, SCOPUS and Web of Science (from inception to November 2014) databases. Meta-analyses were performed using inverse variance with random effects models. The GRADE system was used to rate the quality of the evidence. A P-value lower than 0.05 was considered significant. Results: A total of four RCTs were included in the meta-analyses (1,528 patients) with follow up ranging from 2 to 20 years. Three used old generation mechanical and biological prostheses, and one used contemporary prostheses. No significant difference in mortality was found between BP and MP patients (risk ratio (RR = 1.07; 95% CI 0.99-1.15). The risk of bleeding was significantly lower in BP patients than MP patients (RR = 0.64; 95% CI 0.52-0.78); however, reoperations were significantly more frequent in BP patients (RR = 3.60; 95% CI 2.44-5.32). There were no statistically significant differences between BP and MP patients with respect to systemic arterial embolisms and infective endocarditis (RR = 0.93; 95% CI 0.66-1.31, RR = 1.21; CI95% 0.78-1.88, respectively). Results in the trials with modern and old prostheses were similar. Conclusions: The mortality rate and the risk of thromboembolic events and endocarditis were similar between BP and MP patients. The risk of bleeding was approximately one third lower for BP patients than for MP patients, while the risk of reoperations was more than three times higher for BP patients.


Resumo Fundamento: A escolha de próteses mecânicas ou biológicas para pacientes com doença de válvula cardíaca ainda não é um consenso. Objetivo: Determinar os desfechos clínicos de próteses mecânicas e biológicas nesses pacientes. Métodos: Conduzimos uma revisão sistemática e metanálise e estudos controlados randomizados (RCTs) que compararam próteses mecânicas e biológicas em pacientes com doenças de válvulas cardíaca, e avaliamos seus resultados. A busca por RCTs foi feita nas bases de dados MEDLINE, EMBASE, LILACS, CENTRAL, SCOPUS e Web of Science (do início a novembro de 2014). As metanálises foram realizadas usando variação inversa com modelos de efeitos aleatórios. Usamos o sistema GRADE para avaliar a qualidade da evidência. Um valor menor que 0,05 foi considerado significativo. Resultados: Um total de quatro RCTs foi incluído na metanálise (1528 pacientes) com acompanhamento de 2 a 20 anos. Em três estudos, foram utilizadas próteses mecânicas e biológicas mais antigas, e em um estudo próteses contemporâneas. Não foi observada diferença de mortalidade entre os pacientes que receberam próteses mecânicas e biológicas (risco relativo, RR = 1,07; IC95% 0,99-1,15). O risco de sangramento foi significativamente mais baixo nos pacientes que receberam próteses biológicas que naqueles com próteses mecânicas (RR = 0,64; IC95% 0,52-0,78). Contudo, as reoparações foram mais frequentes em pacientes com próteses biológicas (RR = 3,60; IC95% 2,44-5,32). Não houve diferenças estatisticamente significativas entre pacientes com próteses biológicas e mecânicas em relação à embolia arterial sistêmica e endocardite infecciosa (RR = 0,93; IC95% 0,66-1,31; RR = 1,21; IC95% 0,78-1,88, respectivamente). Resultados entre os estudos com próteses modernas e antigas foram similares. Conclusões: A taxa de mortalidade e o risco de eventos tromboembólicos e endocardite foram similares entre os pacientes que receberam próteses biológicas e mecânicas. O risco de sangramentos foi aproximadamente um terço menor nos pacientes com próteses biológicas que mecânicas, ao passo que o risco de reoperação foi mais que três vezes maior nos pacientes com próteses biológicas.


Subject(s)
Humans , Heart Valve Prosthesis/standards , Heart Valve Diseases/surgery , Reoperation , Bioprosthesis , Randomized Controlled Trials as Topic , Treatment Outcome , Evidence-Based Medicine , Heart Valve Prosthesis Implantation/methods
3.
Rev. bras. cir. cardiovasc ; 33(4): 391-397, July-Aug. 2018. tab, graf
Article in English | LILACS | ID: biblio-958426

ABSTRACT

Abstract Introduction: The interest in Expert systems has increased in the medical area. Some of them are employed even for diagnosis. With the variability of transcatheter prostheses, the most appropriate choice can be complex. This scenario reveals an enabling environment for the use of an Expert system. The goal of the study was to develop an Expert system based on artificial intelligence for supporting the transcatheter aortic prosthesis selection. Methods: The system was developed on Expert SINTA. The rules were created according to anatomical parameters indicated by the manufacturing company. Annular aortic diameter, aortic area, aortic perimeter, ascending aorta diameter and Valsalva sinus diameter were considered. After performing system accuracy tests, it was applied in a retrospective cohort of 22 patients with submitted to the CoreValve prosthesis implantation. Then, the system indications were compared to the real heart team decisions. Results: For 10 (45.4%) of the 22 patients there was no concordance between the Expert system and the heart team. In all cases with discordance, the software was right in the indication. Then, the patients were stratified in two groups (same indication vs. divergent indication). The baseline characteristics did not show any significant difference. Mortality, stroke, acute myocardial infarction, atrial fibrillation, atrioventricular block, aortic regurgitation and prosthesis leak did not present differences. Therefore, the maximum aortic gradient in the post-procedure period was higher in the Divergent Indication group (23.9 mmHg vs. 11.9 mmHg, P=0.03), and the mean aortic gradient showed a similar trend. Conclusion: The utilization of the Expert system was accurate, showing good potential in the support of medical decision. Patients with divergent indication presented high post-procedure aortic gradients and, even without clinical repercussion, these parameters, when elevated, can lead to early prosthesis dysfunction and the necessity of reoperation.


Subject(s)
Humans , Male , Female , Aged , Aged, 80 and over , Heart Valve Prosthesis/standards , Artificial Intelligence , Transcatheter Aortic Valve Replacement/standards , Reference Standards , Software Design , Reproducibility of Results , Retrospective Studies , Statistics, Nonparametric , Clinical Decision-Making
4.
Rev. bras. cir. cardiovasc ; 33(2): 122-128, Mar.-Apr. 2018. tab
Article in English | LILACS | ID: biblio-958395

ABSTRACT

Abstract Objective: The aim of this retrospective study was to compare early postoperative outcomes after aortic valve replacement (AVR) with sutureless bioprostheses and conventional stented bioprostheses implanted through median sternotomy. Methods: From January 2011 to December 2016, 763 patients underwent aortic valve replacement with bioprostheses; of these, 139 received a Perceval S sutureless valve (Group A) and 624 received a Perimount Magna Ease valve (Group B). These groups were further divided into A1 (isolated Perceval AVR), A2 (Perceval AVR with coronary artery bypass grafting [CABG]), B1 (isolated conventional stented bioprosthesis), and B2 (conventional stented bioprosthesis + CABG). Results: Patients in Group A were older (mean 74 years vs. 71 years; P<0.0001), predominantly women (53% vs. 32%; P<0.0001), had a higher logistic EuroSCORE (3.26 vs. 2.43; P<0.001), more preoperative atrial fibrillation (20% vs. 13%; P=0.03), and had a lower reopening rate for bleeding (2.1% vs. 6.7%; P=0.04). Compared to Group B1, Group A1 had shorter cross-clamp (mean 40 min vs. 57 min; P≤0.0001) and bypass times (mean 63 min vs. mean 80 min; P=0.02), and they bled less postoperatively (mean 295 ml vs. mean 393 ml; P=0.002). The mean gradient across Perceval valve was 12.5 mmHg while its effective orifice area was 1.5 cm2. Conclusion: In our retrospective study of 763 patients, sutureless valve group patients are older, mostly women, more symptomatic preoperatively, and have higher logistic EuroSCORE. They have shorter cross-clamp and bypass times, less postoperative bleeding, and reduced incidence of reopening. Further studies are needed to evaluate the clinical benefits in short, mid, and long-terms.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Aortic Valve Stenosis/surgery , Bioprosthesis/standards , Heart Valve Prosthesis/standards , Transcatheter Aortic Valve Replacement/methods , Aortic Valve/surgery , Postoperative Period , Prosthesis Design , Time Factors , Cardiopulmonary Bypass/methods , Reproducibility of Results , Retrospective Studies , Treatment Outcome , Constriction , Sternotomy/methods , Sutureless Surgical Procedures/methods
5.
ABC., imagem cardiovasc ; 31(1): f:4-l:56, jan.-mar. 2018. ilus, tab, graf
Article in Portuguese | LILACS | ID: biblio-878730

ABSTRACT

Disfunção de prótese valvar cardíaca (PVC) é rara, porém é uma potencial ameaça à vida. Estabelecer o exato mecanismo da disfunção da PVC é desafiador, no entanto é essencial para determinar a estratégia terapêutica apropriada. Na prática clinica, uma abordagem abrangente que integra vários parâmetros de morfologia e função avaliados pelo eco transtorácico 2D/3D e transesofágico são fundamentais para detectar e quantificar a disfunção da PVC. A cinefluoroscopia, a tomografia computadorizada com multidectetores, a ressonância magnética cardíaca, e em menor escala, a imagem nuclear, são ferramentas complementares para o diagnóstico e abordagem das complicações das PVC. Este documento apresenta recomendações para o uso de imagem em multimodalidade para avaliação das PVCs


Subject(s)
Humans , Male , Female , Diagnostic Imaging , Echocardiography, Transesophageal/methods , Echocardiography/methods , Heart Valve Prosthesis/standards , Magnetic Resonance Spectroscopy/methods , Multidetector Computed Tomography/methods , Aortic Valve , Bioprosthesis , Diagnosis, Differential , Echocardiography, Doppler/methods , Echocardiography, Stress/methods , Hemodynamics , Mitral Valve , Nuclear Medicine/methods , Positron Emission Tomography Computed Tomography/methods , Prostheses and Implants , Evaluation Studies as Topic , Evaluation Studies as Topic , Stents , Stroke Volume , Thrombosis , Tomography, X-Ray Computed/methods , Tricuspid Valve
6.
Rev. bras. cir. cardiovasc ; 31(2): 171-173, Mar.-Apr. 2016. tab, graf
Article in English | LILACS | ID: lil-792644

ABSTRACT

Abstract Objective: To complement the ISO 5840 standards concerning the duration of left ventricular systole and diastole as a function of changes in heart rates according to in vivo studies from the physiologic literature review. Methods: The systolic and diastolic durations from three in vivo studies were compared with the durations of systole proposed by the ISO 5840:2010 and ISO 5840-2:2015 for hydrodynamic performance assessment of prosthetic heart valves. Results: Based on the in vivo studies analyzed, the systolic durations proposed by the ISO 5840 standard seemed consistent for 45 and 120 beats per minute (bpm), and showed diverse results for the 70 bpm condition. Conclusion: Information on the realistic validation of the operation of left ventricular models for different heart rates were obtained.


Subject(s)
Humans , Heart Valve Prosthesis/standards , Heart Rate/physiology , Systole/physiology , Pulsatile Flow , Guidelines as Topic/standards , Diastole/physiology , Hydrodynamics , Models, Cardiovascular
7.
Rev. ADM ; 64(3)mayo-jun. 2007. graf
Article in Spanish | LILACS | ID: lil-475028

ABSTRACT

El paciente portador de prótesis valvular puede presentar riesgos durante su atención estomatológica, entre los que se encuentran la endocarditis bacteriana y las hemorragias. El objetivo fue determinar el manejo estomatológico en pacientes con prótesis valvular cardiaca del Hospital de Cardiología Centro Médico Nacional Siglo XXI. El estudio se realizó en 23 pacientes de ambos sexos de 3 a 78 años de edad portadores de prótesis valvular, que requerían atención estomatológica. Los resultados mostraron que el manejo estomatológico de estos pacientes requirió de la premedicación con antibioticoterapia para evitar endocarditis bacteriana, además fue necesario suspender el anticoagulante y utilizar hemostáticos para prevenir hemorragia; a pesar de las medidas tomadas, tres pacientes presentaron sangrado continuo, cediendo en dos de ellos al suspender el anticoagulante y al hacer uso de hemostáticos locales y en otro al administrar plasma fresco congelado. Se concluye que la atención estomatológica del paciente con prótesis valvular cardiaca debe realizarse a nivel hospitalario, con un equipo multidisciplinario y los recursos necesarios para proteger la vida del paciente.


Subject(s)
Humans , Male , Female , Child, Preschool , Child , Adolescent , Adult , Middle Aged , Antibiotic Prophylaxis , Dental Care for Chronically Ill , Heart Valve Prosthesis/statistics & numerical data , Heart Valve Prosthesis/standards , Age Distribution , Anti-Bacterial Agents/therapeutic use , Cross-Sectional Studies , Epidemiology, Descriptive , Endocarditis, Bacterial/prevention & control , Oral Hemorrhage/prevention & control , Hemostatics/therapeutic use , Mexico/epidemiology , Data Interpretation, Statistical
8.
Rev. méd. Chile ; 133(10): 1161-1172, oct. 2005. tab, graf
Article in Spanish | LILACS | ID: lil-420144

ABSTRACT

Background: Mechanical aortic valve replacement (AVR) results have been published extensively in industrialized countries. Aim: To assess our immediate and late results in patients subjected to AVR. Patients and Methods: We retrospectively studied 194 patients subjected to isolated AVR between 1995 and 2003. Mean age was 57 ± 13 years and 119 (61%) were male. One hundred thirty nine (73%) were in functional class III-IV, 20 (10%) had a previous cardiac operation and 25 (13%) were operated as an emergency. Surgical indication was stenosis in 110 (58%), regurgitation in 49 (26%) and stenosis/regurgitation in 31 (16%). Etiology was bicuspid valve 56 (29%), degenerative lesions 55 (28%), rheumatic valve disease 38 (20%) and endocarditis 27 (14%). Medtronic Hall was the most common prosthesis used in 157 patients (81%). Mean cardiopulmonary bypass time 97 ± 29 min and mean cross clamp time was 69 ± 21 min. Results: Operative mortality was 4.6% (3% in elective surgery, 16% in emergency surgery and 0% in reoperations). Follow-up was complete in 100% of cases, totalizing 636 patients-year. Survival was 91 ± 2%, 80 ± 4% and 73 ± 6%, at 1, 5 and 7 years, respectively. Multivariate risk analysis identified renal failure and endocarditis as predictors of early and late mortality. During follow up, the linear incidence rate for hemorrhage was 3.29% /patients-year, thromboembolism 2.04% patients-year and endocarditis 1.1% patients-year. Conclusions: AVR has low overall and elective mortality. Midterm survival is good but linear event rates related to anticoagulant treatment are higher than those previously published in industrialized countries. Renal failure and endocarditis were risk factors for early and late death.


Subject(s)
Aged , Female , Humans , Male , Middle Aged , Aortic Valve/surgery , Heart Valve Diseases/surgery , Heart Valve Prosthesis Implantation/mortality , Heart Valve Prosthesis/standards , Postoperative Complications/mortality , Chile/epidemiology , Disease-Free Survival , Follow-Up Studies , Heart Valve Diseases/mortality , Mitral Valve/surgery , Retrospective Studies , Survival Rate
9.
Arq. bras. cardiol ; 83(3): 203-218, set. 2004. ilus, tab, graf
Article in English, Portuguese | LILACS | ID: lil-382722

ABSTRACT

OBJETIVO: Determinar a efetividade do isolamento cirúrgico da parede posterior do átrio esquerdo envolvendo os óstios das veias pulmonares, no tratamento da fibrilação atrial de etiologia reumática. MÉTODOS: Estudo prospectivo e randomizado envolvendo portadores de valvopatia mitral reumática, fibrilação atrial persistente com duração > a 6 meses, idade < a 60 anos e diâmetro atrial esquerdo < a 65 mm. Os pacientes foram distribuídos aleatoriamente em dois grupos: tratamento cirúrgico valvar (grupo controle) e tratamento cirúrgico valvar associado ao isolamento da parede posterior do átrio esquerdo mediante técnica de "corte e sutura" (grupo tratado). RESULTADOS: Foram operados 29 indivíduos, sendo que 27 (13 do grupo controle e 14 do grupo tratado), foram acompanhados regularmente. Os pacientes dos dois grupos não diferiram em relação às suas características basais. O tempo de seguimento médio foi de 11,5 meses no grupo controle e de 10,3 meses no grupo tratado. As freqüências cumulativas de pacientes livres de fibrilação atrial foram significativamente maiores no grupo tratado tanto na fase peri-operatória (p= 0,0035) quanto na fase tardia (p= 0,0430). CONCLUSAO: O isolamento cirúrgico da parede posterior do átrio esquerdo envolvendo os óstios das veias pulmonares é uma forma efetiva de tratamento da fibrilação atrial na valvopatia mitral reumática.


Subject(s)
Humans , Male , Female , Middle Aged , Atrial Fibrillation/surgery , Bioprosthesis , Heart Valve Prosthesis/standards , Mitral Valve Insufficiency/surgery , Mitral Valve/surgery , Pulmonary Veins/surgery , Chronic Disease , Echocardiography , Electrocardiography , Follow-Up Studies , Postoperative Period , Prospective Studies , Ventricular Dysfunction, Left/physiopathology
10.
Arq. bras. cardiol ; 82(3): 235-250, mar. 2004. ilus, tab, graf
Article in English, Portuguese | LILACS | ID: lil-356896

ABSTRACT

OBJETIVO: Comparar, clinica e laboratorialmente, três grupos de pacientes submetidos ao tratamento cirúrgico da insuficiência mitral crônica isolada; um grupo submetido à plástica valvar e dois à troca da valva mitral com diferentes técnicas de preservação das cordas. MÉTODOS: Operados 28 pacientes com idade média de 54,1 anos, sem doença coronariana, multivalvar ou reoperações: 9 tiveram plástica valvar, 10 troca valvar mitral com preservação das cordas de ambas as cúspides, e 9 apenas da cúspide posterior. Avaliações clínicas, ecodopplercardiográfica e radioisotópica foram realizadas até o 6º mês de seguimento. RESULTADOS: Ao final, 88,8 por cento encontravam-se em classe funcional I. Um faleceu por hemorragia intracraniana durante tratamento anticoagulante. Houve queda no diâmetro diastólico (p<0,0001) e volume diastólico final do ventrículo esquerdo (p<0,0001) nos três grupos. Apenas os pacientes submetidos à plástica tiveram queda no diâmetro sistólico (p=0,0003) e no volume sistólico final (p=0,0040), sem alterações na fração de ejeção (p=0,5586). Os submetidos à troca valvar mitral tiveram queda similar na fração de ejeção (p=0,0001 e p=0,0296). CONCLUSAO: Houve melhora clínica com as três técnicas empregadas. Os pacientes submetidos à plástica valvar tiveram melhor preservação da função ventricular. Não houve diferença significativa no desempenho cardíaco entre os dois grupos submetidos à troca valvar mitral com preservação das cordas até o 6º mês de seguimento.


Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Chordae Tendineae/surgery , Heart Valve Prosthesis , Mitral Valve Insufficiency/surgery , Mitral Valve/surgery , Plastic Surgery Procedures , Chronic Disease , Diastole , Echocardiography , Follow-Up Studies , Heart Valve Prosthesis Implantation , Heart Valve Prosthesis/adverse effects , Heart Valve Prosthesis/standards , Mitral Valve Insufficiency/pathology , Postoperative Complications , Plastic Surgery Procedures/adverse effects , Plastic Surgery Procedures/standards , Systole , Treatment Outcome , Vascular Resistance
11.
In. Sousa, Amanda GMR; Piegas, Leopoldo S; Sousa, J Eduardo MR. Série Monografias Dante Pazzanese. Rio de Janeiro, Revinter, 2000. p.92, ilus, ilus.
Non-conventional in Portuguese | LILACS, SES-SP, SESSP-IDPCPROD, SES-SP | ID: biblio-1069390

ABSTRACT

A abordagem cirúrgica conservadora da valva mitral é amplamente analisada nesta monografia. A plastia mitral, cada vez mais, se estabelece como tratamento de primeira escolha para a regurgitação mitral de qualquer etiologia. O crescimento dessa aceitação deve-se à superioridade da plastia mitral em termos de morbidade e mortalidade quando comparada aos substitutos valvares, fato esse amplamente respaldado pela literatura. Ao rever brevemente o histórico da plastia mitral, percebemos a importância de Carpentier e a atualidade de suas contribuições tão originais, bem como a visão de longo alcance e a proximidade com o método cintífico de Cosgrove...


Subject(s)
Humans , Thoracic Surgery/methods , Thoracic Surgery/trends , Mitral Valve Insufficiency/mortality , Mitral Valve Insufficiency/prevention & control , Mitral Valve/surgery , Mitral Valve/injuries , Echocardiography/methods , Heart Valve Prosthesis/standards , Heart Valve Prosthesis
14.
Av. cardiol ; 13(2): 41-53, 1993. tab
Article in Spanish | LILACS | ID: lil-137204

ABSTRACT

Revisamos 102 casos de pacientes con edades comprendidas entre 10-70 años de edad, con un promedio de 40 años; intervenidos quirúrgicamente de reemplazos válvulares Mitrales o Aortícos; en el período 1988-92 en el Servicio de Cirugía Cardiovascular Hospital Miguel Pérez Carreño I.V.S.S. Caracas-Venezuela, con el objetivo de estudiar la indicaciones quirúrgicas, criterio diagnóstico post-operatorio (clasificación SPENCER-GIBBON de acuerdo al área valvular), tipo de prótesis valvulares utilizadas y Morbi-Mortalidad. Habiendo encontrado un predominio de Cirugía Valvular Mitral, con componente de estenósis pura en un 31,37 por ciento seguido de Cirugía Valvular Aórtica con componente de Insuficiencia Aórtica en 13,72 por ciento , siendo la prótesis más utilizada la Medtronic-Hall en 65,68 por ciento de los casos


Subject(s)
Heart Valve Prosthesis/classification , Heart Valve Prosthesis/standards , Heart Valve Prosthesis
16.
Arq. bras. cardiol ; 57(5): 385-388, nov. 1991. ilus, tab
Article in Portuguese | LILACS | ID: lil-107783

ABSTRACT

Objetivo - Estudar o anel aórtico humano e verificar a possibilidade de reproduzí-lo artificialmente. Métodos - A configuração anatômica de seis valvas aórticas normais foi estudada através de injeção de borracha de silicone na aorta ascendente, obtendo-se moldes rigidos do aparelho valvar aórtico. A partir desses moldes, obtiveram-se modelos de epoxi correspondentes ao anel valvar aórtico. Foram considerados os seguintes parâmetros: diâmetro da base (Db), diâmetro das comissuras (Dc), altura (h) e a relação Db/Dc e Db/h. Foram determinados a média e o desvio padrão dos valores obtidos. Resultados - A análise dos moldes indica que o anel valvar aórtico deriva de uma esfera. As medidas obtidas foram: Db = 22 ± 1,67 mm Dc = 19,67 ± 1,3 mm; h = 16,00 ± 1,09 mm; Db/ Dc = 1,12 ± 0,04 e Db/h = 1,38 ± 0,10. Conclusão - A partir destas figuras foi possível definir a configuração esférica ou semi-esférica do anel valvar aórtico e reproduzir sua configuração na confecção da biopr


Purpose - To study the normal human aortic valvular ring, and to evaluate the possibility of reproducing its shape artificially. Methods - The anatomical configuration of six normal aortic valves was studied through the injection of silicone rubber in the ascending aorta. From the resulting casts, epoxi models corresponding to the aortic annulus were obtained. The following parameters were determined: diameter of the base (Db), diameter of the commissures (Dc), height (h) and the Db/Dc and Db/h relationships. The mean value (x) and the standard deviation (SD) of each parameter were studied. Results - The observation of the casts indicate that the aortic valvular ring derives from a sphere. The measures obtained were: Db = 22 ± 1.67 mm; Dc = X 19.67 ± 1.3 mm; h = 16.00 ±1.09 mm; Db/Dc = X = 1.12 ± 0.04 and Db/h =1.38 ± 0.10. Starting from these figures it was possible to define the spheric configuration of the aortic valvular ring, as well as to reproduce it artificially. Conclusions - The aortic valvular ring has a configuration derived from a sphere or hemi-sphere. The parameters obtained from the above program, it was possible to reproduce theconfiguration of the aortic valvular ring and to use it for a bioprothesis


Subject(s)
Humans , Heart Valve Prosthesis/standards , Bioprosthesis/standards , Models, Anatomic , Aortic Valve/anatomy & histology
18.
Arch. Inst. Cardiol. Méx ; 56(4): 319-22, jul.-ago. 1986. tab, ilus
Article in Spanish | LILACS | ID: lil-46511

ABSTRACT

Este informe preliminar documenta la experiencia clínica con el uso de una prótesis mecánica de bola de fabricación nacional mexicana. Entre mayo de 1985 y marzo de 1986, se efectuaron en forma consecutiva 25 reemplazos valvulares en 23 pacientes: 14 en posición aórtica, 9 mitrales y 2 mitro aórtios. La edad promedio fue de 32 años. La etiología fue reumática en el 95% de los casos. La clase funcional pre-operatorio fué: clase II en 6 pacientes, clase III en 15 pacientes y clase IV en 2 casos. La mortalidad operatoria fue de un caso (4.5%). Se efectuó seguimiento en todos los sobrevivientes con promedio de 5 meses. No se han observado muertes tardías ni complicaciones relacionadas con la prótesis, la curva de sobrevida actuarial a 10 meses es de 96.0%. La mayor parte de los pacientes pasaron a clase funcional I (80%) y II (20%). Nuestro estudio sugiere que la prótesis mecánica de bola Biomed tiene buen funcionamiento y que los resultados clínicos justifican hasta ahora continuar con el uso de ella


Subject(s)
Humans , Rheumatic Heart Disease/surgery , Heart Valve Prosthesis/standards , Aortic Valve , Mexico , Mitral Valve
SELECTION OF CITATIONS
SEARCH DETAIL