Browsing by Author "Martins, M."
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- Benefício do diagnóstico pré-natal na transposição das grandes artériasPublication . Pinheiro, A.; Teixeira, A.; Abecasis, M.; Martins, M.; Anjos, R.Objectivo: Analisar o impacto do diagnóstico pré-natal (DPN) de transposição das grandes artérias (TGA) na morbilidade e mortalidade perioperatória num centro de Cardiologia Pediátrica. Métodos: Estudo retrospectivo dos recém-nascidos (RN) com TGA simples, com e sem DPN, operados, entre Janeiro de 2007 e Julho de 2010. Foram analisadas as variáveis referentes às características clínicas dos doentes, idade da cirurgia, tempo de duração de circulação extracorporal e a evolução pós-operatória. No estudo estatístico utilizaram-se os testes T de Student e o teste do Qui quadrado assumindo-se um nível de significância de 5%. Resultados: De 31 RN com TGA avaliámos 17 casos de TGA simples, seis com DPN (grupo 1) e 11 com diagnóstico neonatal (grupo 2). Os partos do grupo 1 ocorreram todos em hospital terciário, por cesariana. Os RN do grupo 2 iniciaram prostaglandinas, em média às 26,7 horas (h). A atrioseptostomia de Rashkind foi efectuada em média às 27,2h vs 55,1h. No segundo grupo o internamento na Unidade de Cuidados Intensivos (UCI) ocorreu em média às 20,4h de vida. O valor mínimo de saturação de oxigénio pré-operatória variou entre 82-95% vs 30-80%. No primeiro grupo 16,7% dos RN tiveram acidose metabólica pré-operatória vs 54,5% e a creatinina máxima variou entre 0,5-0,8 mg/dl vs 0,6-1,1. As cirurgias do primeiro grupo foram em média aos 9,0 dias (d) de vida vs 11,5. Tempos de circulação extra-corporal e ventilação mecânica semelhantes em ambos os grupos. Tempo de internamento na UCI, em média: 4,7d vs 7,4 e total de internamento: 12,0d vs 29,9. Complicações no pós-operatório: grupo 1 - tamponamento cardíaco (1), enterocolite necrosante (1); grupo 2: fibrilhação ventricular (1), hemotórax compressivo (1), bloqueio aurículo-ventricular completo transitório (1), sépsis (1), parésia do diafragma (1), derrame pericárdico (1) e óbito (1). Conclusão: O DPN de TGA permite programar o parto nas condições ideais e iniciar precocemente a terapêutica necessária, evitando complicações como a hipoxémia prolongada e a acidose metabólica, reduzindo assim o tempo de internamento. ABSTRACT Objective: To study the impact of prenatal diagnosis (PND) of transposition of the great arteries (TGA) on perioperative morbidity and mortality in a pediatric cardiology center. Methods: Retrospective study of newborns (NB) with simple TGA, with and without PND, who underwent corrective surgery, between January 2007 and July 2010. The following variables were analysed: clinical characteristics of the patients, age at surgery, duration of circulatory arrest, and outcome. Statistical analysis included the Student t and the X2 tests. Statistical significance was assessed by use of a cutoff value of P =0,05. Results: Among a total of 31 NB with TGA we isolated 17 cases of simple TGA, six with PND (Group 1) and 11 with neonatal diagnosis (Group 2). Deliveries of group 1 were all in tertiary hospital by caesarean section. The NB of Group 2 started prostaglandins at a mean time of 26,7 hours (h). The Rashkind procedure was carried out at a mean time of 27,2h vs 55,1h. In the second group the intensive care unit (ICU) admission occurred at 20,4h. The minimum oxygen saturation in preoperative varied between 82-95% vs 30-80%. In the first group 16,7% of the NB had preoperative metabolic acidosis vs 54,5% and maximum creatinine value varied between 0,5-0,8 mg/dl vs 0,6-1,1. The surgeries of the 1st group occurred on average at 9,0 days (d) of life vs 11,5d. Extra-corporal circulation and ventilation support durations were similar in both groups. The mean ICU stay was 4,7d vs 7,4d and the mean total hospital stay was 12,0d vs 29,9d. Complications in postoperative period: group 1 - cardiac tamponade (1), necrotizing enterocolitis (1); group 2: ventricular fibrillation (1), compressive hemothorax (1), transitory complete atrioventricular block (1), sepsis (1), diaphragm paresis (1), pericardial effusion (1) and death (1). Conclusion: The PND of TGA allowed us to schedule delivery in optimal conditions and provide adequate management, avoiding complications such as prolonged hypoxemia and metabolic acidosis.
- Deciphering the Contribution of Biofilm to the Pathogenesis of Peritoneal Dialysis Infections: Characterization and Microbial Behaviour on Dialysis FluidsPublication . Sampaio, J.; Machado, D.; Gomes, A.; Machado, I.; Santos, C.; Lima, N.; Carvalho, M.; Cabrita, A.; Rodrigues, A.; Martins, M.Infections are major complications in peritoneal dialysis (PD) with a multifactorial etiology that comprises patient, microbial and dialytic factors. This study aimed at investigating the contribution of microbial biofilms on PD catheters to recalcitrant infections and their interplay with PD related-factors. A prospective observational study was performed on 47 patients attending Centro Hospitalar of Porto and Vila Nova de Gaia/Espinho to whom the catheter was removed due to infectious (n = 16) and non-infectious causes (n = 31). Microbial density on the catheter was assessed by culture methods and the isolated microorganisms identified by matrix-assisted laser desorption/ionization time-of-flight intact cell mass spectrometry. The effect of conventional and three biocompatible PD solutions on 16 Coagulase Negative Staphylococci (CNS) and 10 Pseudomonas aeruginosa strains planktonic growth and biofilm formation was evaluated. Cultures were positive in 87.5% of the catheters removed due infectious and 90.3% removed due to non-infectious causes. However, microbial yields were higher on the cuffs of catheters removed due to infection vs. non-infection. Staphylococci (CNS and Staphylococcus aureus) and P. aeruginosa were the predominant species: 32% and 20% in the infection and 43.3% and 22.7% in the non-infection group, respectively. In general, PD solutions had a detrimental effect on planktonic CNS and P. aeruginosa strains growth. All strains formed biofilms in the presence of PD solutions. The solutions had a more detrimental effect on P. aeruginosa than CNS strains. No major differences were observed between conventional and biocompatible solutions, although in icodextrin solution biofilm biomass was lower than in bicarbonate/lactate solution. Overall, we show that microbial biofilm is universal in PD catheters with the subclinical menace of Staphylococci and P. aeruginosa. Cuffs colonization may significantly contribute to infection. PD solutions differentially impact microbial species. This knowledge is important for the development of infection diagnosis, treatment and preventive strategies.
- Evaluation of effluent markers cancer antigen 125, vascular endothelial growth factor, and interleukin‐6: relationship with peritoneal transportPublication . Rodrigues, Anabela; Martins, M.; Santos, M.; Fonseca, Isabel; Carlos Oliveira, José; Cabrita, A.; Castro e Melo, J.; Krediet, R.Peritoneal hyperpermeability has been associated with increased levels of effluent vascular endothelial growth factor (VEGF) and interleukin-6 (IL-6). Mesothelial cells can produce various vasoactive substances besides VEGF. A large mesothelial mass may possibly lead to high dialysate VEGF concentrations and may partly explain some cases of peritoneal hyperpermeability during a patient’s early months on peritoneal dialysis (PD). Early peritoneal fast transport may therefore not necessarily be associated with systemic inflammation. To investigate the relationship of effluent markers and peritoneal transport, we measured the appearance rates of cancer antigen 125 (CA125), VEGF, and IL-6 in 4-hour effluents from 69 peritoneal equilibration tests (PETs) using 3.86% glucose solution. At the same time, we measured serum VEGF and IL-6. Our analyses included an early group (EG), whose members had been on PD for 4.6 ± 3.3 months, and a later group (LG), whose members had been on PD for 30 ± 17 months. In EG, dialysate-to-plasma creatinine at 4 hours (D/PCr240) correlated significantly with effluent CA125/min (r = 0.51, p = 0.006) and VEGF/min (r = 0.57, p = 0.001), but not with serum VEGF or IL-6. The values of CA125/min and VEGF/min also correlated (r = 0.40, p = 0.034). Fast transporters in EG had higher effluent CA125 (p = 0.057) and VEGF (p = 0.0001), but not serum or effluent IL-6. In LG, D/PCr240 again correlated significantly with dialysate VEGF(r = 0.51, p = 0.009), but not with CA125. Fast transporters in LG tended to have higher levels of serum and effluent IL-6 and effluent VEGF. We conclude that fast solute transport rates at the beginning of PD are associated with signs of a large mesothelial cell mass and not consistently associated with higher systemic IL-6. The VEGF produced by mesothelial cells can mediate early peritoneal hyperpermeability in some populations. Later, mesothelial mass is lost and is no longer related to increased intraperitoneal VEGF or IL-6.
- Genes, Crianças e PediatrasPublication . Soares, G.; Dias, C.; Martins, M.; Fortuna, A.; Reis-Lima, M.; Álvares, S.
- Genes, Crianças e Pediatras 2005 IIPublication . Dias, C.; Martins, M.; Rocha, M.; Soares, G.; Pinto-Basto, J.; Gonçalves, S.; Carrilho, I.; Fortuna, A.; Reis-Lima, M.
- Genes, Crianças e Pediatras IIPublication . Pinto-Basto, J.; Soares, G:; Dias, C.; Martins, M.; Fortuna, A.; Barbot, J.; Reis-Lima, M.
- Genes, Crianças e Pediatras IIIPublication . Dias, C.; Soares, G.; Pinto-Basto, J.; Fortuna, A.; Martins, M.; Reis-Lima, M.; Fonseca, F.
- Genes, Crianças e Pediatras IVPublication . Soares, G.; Pimentel, I.; Dias, C.; Pinto-Basto, J.; Martins, M.; Fortuna, A.; Reis-Lima, M.
- Genes, Crianças e Pediatras, 2005 IPublication . Pinto-Basto, J.; Martins, T.; Soares, G.; Dias, C.; Rocha, M.; Martins, M.; Fortuna, A.; Reis-Lima, M.
- Genes, crianças e pediatras: acondroplasiaPublication . Rocha, M.; Pinto-Basto, J.; Almeida, S.; Martins, M.; Lima, M.