European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery
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Eur J Cardiothorac Surg · Jul 2006
Patient-prosthesis mismatch does not affect survival following aortic valve replacement.
Patient-prosthesis mismatch (PPM) has been reported to increase perioperative mortality and reduce postoperative survival in patients undergoing aortic valve replacement (AVR). We analysed the effect of PPM at values predicting severe mismatch on survival following AVR in our unit. ⋯ Severe patient-prosthesis mismatch was predicted in 4-10% of patients undergoing AVR but this did not affect in-hospital mortality or mid-term survival.
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Eur J Cardiothorac Surg · Jul 2006
Hyporesponsiveness of T cell subsets after cardiac surgery: a product of altered cell function or merely a result of absolute cell count changes in peripheral blood?
The activity of the specific immune system and especially the function of T helper (TH) cells are reduced after cardiac surgery. This decrease is followed by an increase in TH2 cell activity and a delayed recovery of TH1 cell function (TH1/TH2 shift). Neither the underlying cause nor the relationship between the absolute numbers of T lymphocyte subpopulations, the state of activation of these cells and cytokine synthesis in cell culture has been clarified. We conducted a prospective study in order to test the hypothesis that the decrease in specific immunity is not caused by dilution effects but by functional alterations in T cell subsets. ⋯ The number of immune cells of the specific and the non-specific immune system is not reduced in the immediate postoperative period. Haemodilution thus has no detectable effect on immune function at this time point. Beginning on d1, the function of specific immune cells, especially TH lymphocytes, is severely suppressed. This functional alteration appears not to be preceded by T cell activation during CPB. Although TH cell activity begins to increase on d1, cytokine synthesis is reduced. When cytokine synthesis is corrected to the absolute number of TH cells in culture, there is strong evidence for an increase in TH2 cell activity. On the whole, these results corroborate the hypothesis of a TH1/TH2 shift that is primarily caused by an alteration of TH1 function. Neither haemodilution nor a preceding activation plays a major role.
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Eur J Cardiothorac Surg · Jul 2006
Twenty years experience of surgical aortic valvotomy for critical aortic stenosis in early infancy.
To examine early and long-term results of surgical aortic valvotomy in neonates and infants aged less than 3 months. ⋯ Primary surgical aortic valvotomy in early infancy carries a low early and late mortality, a low occurrence of significant aortic regurgitation and a low early recurrence of aortic stenosis. In great majority of cases, reintervention can be delayed to allow implantation of an adult-sized prosthesis, when required.
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Eur J Cardiothorac Surg · Jul 2006
A single nucleotide polymorphism of macrophage migration inhibitory factor is related to inflammatory response in coronary bypass surgery using cardiopulmonary bypass.
Cardiac surgery causes induction and release of inflammatory mediators that may be regulated by genetic background. Macrophage migration inhibitory factor (MIF) is a proinflammatory mediator that is known to be up-regulated in patients undergoing cardiac operations. Here we analyzed genotype distribution and allele frequency of the MIF-173*G/C single nucleotide polymorphism (SNP) and MIF plasma levels in patients undergoing surgical revascularization with (on-pump, n=45) and without (off-pump, n=34) cardiopulmonary bypass (CPB). ⋯ Patients carrying the C-allele showed significantly increased levels of the proinflammatory cytokine MIF compared to G/G homozygous when revascularization was carried out using CPB. The G/C genotype may be associated with a severe inflammatory reaction and therefore preoperative screening could be beneficial for patients undergoing cardiac surgery using CPB.
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Eur J Cardiothorac Surg · Jul 2006
Intraoperative mapping of the right atrial free wall during sinus rhythm: variety of activation patterns and incidence of postoperative atrial fibrillation.
The atrial conduction properties associated with cardiac disease are speculated as the background of postoperative atrial fibrillation (POAF). We examined the atrial conduction patterns and conduction properties during sinus rhythm (SR) in patients that had undergone cardiac operations and evaluated the incidence of POAF in all patients. ⋯ Cardiac surgery patients exhibited a variety of sinus activation patterns, which also provided an arrhythmogenic substrate for POAF. A better understanding of the sinus activation using an intraoperative mapping system may provide benefit in the clinical management of POAF.