IL-10 indirectly modulates functional activity of CD4+CD28null T-lymphocytes through LFA-3 and HLA class II inhibition.

Expansion of CD4+CD28null T-lymphocytes is common in chronic heart failure (CHF) patients. Its ability to produce high levels of proinflammatory cytokines is probably the key role of these cells in CHF. IL-10 is a candidate for limiting CD4+CD28null T-lymphocyte responses, whereas tumour necrosis factor (TNF) is the cytokine most closely involved in the loss of CD28 expression. Serum levels of TNF and IL-10 were measured in 65 CHF patients (mean age, 65.2 ± 13.84 years). Patients with an IL-10/TNF ratio ≥1 had significantly lower levels of CD4+CD28null T-lymphocytes than those with a ratio <1. In vitro, IL-10 reduced the frequency of proliferative CD4+CD28null T-lymphocytes stimulated with anti-CD3. Pre-treatment with IL-10 before anti-CD3 stimulation was required for the cytokine to inhibit TNF production by CD4+CD28null T-lymphocytes. In addition to the previously described effect of IL-10 on HLA-DR and ICAM-1 expression, LFA-3 protein and mRNA levels were reduced in the presence of the cytokine in monocytes. IL-10 inhibition on CD4+CD28null T-lymphocytes may be mediated by a reduction in HLA class II and LFA-3 expression because blocking interactions with these costimulators has similar effects to those of IL-10 treatment. Moreover, costimulation through CD2/LFA-3 interaction is enough to induce proliferation and cytokine production in CD4+CD28null T-lymphocytes.

Review of the allocation criteria for heart transplant in Spain in 2023. SEC-Heart Failure Association/ONT/SECCE consensus document.

Heart transplant (HT) remains the best therapeutic option for patients with advanced heart failure (HF). The allocation criteria aim to guarantee equitable access to HT and prioritize patients with a worse clinical status. To review the HT allocation criteria, the Heart Failure Association of the Spanish Society of Cardiology (HFA-SEC), the Spanish Society of Cardiovascular and Endovascular Surgery (SECCE) and the National Transplant Organization (ONT), organized a consensus conference involving adult and pediatric cardiologists, adult and pediatric cardiac surgeons, transplant coordinators from all over Spain, and physicians and nurses from the ONT. The aims of the consensus conference were as follows: a) to analyze the organization and management of patients with advanced HF and cardiogenic shock in Spain; b) to critically review heart allocation and priority criteria in other transplant organizations; c) to analyze the outcomes of patients listed and transplanted before and after the modification of the heart allocation criteria in 2017; and d) to propose new heart allocation criteria in Spain after an analysis of the available evidence and multidisciplinary discussion. In this article, by the HFA-SEC, SECCE and the ONT we present the results of the analysis performed in the consensus conference and the rationale for the new heart allocation criteria in Spain.

Incidence and Prognosis of Colorectal Cancer After Heart Transplantation: Data From the Spanish Post-Heart Transplant Tumor Registry.

In this observational and multicenter study, that included all patients who underwent a heart transplantation (HT) in Spain from 1984 to 2018, we analyzed the incidence, management, and prognosis of colorectal cancer (CRC) after HT. Of 6,244 patients with a HT and a median follow-up of 8.8 years since the procedure, 116 CRC cases (11.5% of noncutaneous solid cancers other than lymphoma registered) were diagnosed, mainly adenocarcinomas, after a mean of 9.3 years post-HT. The incidence of CRC increased with age at HT from 56.6 per 100,000 person-years among under 45 year olds to 436.4 per 100,000 person-years among over 64 year olds. The incidence rates for age-at-diagnosis groups were significantly greater than those estimated for the general Spanish population. Curative surgery, performed for 62 of 74 operable tumors, increased the probability of patient survival since a diagnosis of CRC, from 31.6% to 75.7% at 2 years, and from 15.8% to 48.6% at 5 years, compared to patients with inoperable tumors. Our results suggest that the incidence of CRC among HT patients is greater than in the general population, increasing with age at HT.

Results of heart retransplantation: subanalysis of the Spanish Heart Transplant Registry.

INTRODUCTION AND OBJECTIVES: Heart retransplantation (ReHT) is controversial in the current era. The aim of this study was to describe and analyze the results of ReHT in Spain. METHODS: We performed a retrospective cohort analysis from the Spanish Heart Transplant Registry from 1984 to 2018. Data were collected on donors, recipients, surgical procedure characteristics, immunosuppression, and survival. The main outcome was posttransplant all-cause mortality or need for ReHT. We studied differences in survival according to indication for ReHT, the time interval between transplants and era of ReHT. RESULTS: A total of 7592 heart transplants (HT) and 173 (2.3%) ReHT were studied (median age, 52.0 and 55.0 years, respectively). Cardiac allograft vasculopathy was the most frequent indication for ReHT (42.2%) and 59 patients (80.8%) received ReHT >5 years after the initial transplant. Acute rejection and primary graft failure decreased as indications over the study period. Renal dysfunction, hypertension, need for mechanical ventilation or intra-aortic balloon pump and longer cold ischemia time were more frequent in ReHT. Median follow-up for ReHT was 5.8 years. ReHT had worse survival than HT (weighted HR, 1.43; 95%CI, 1.17-1.44; P<.001). The indication of acute rejection (HR, 2.49; 95%CI, 1.45-4.27; P<.001) was related to the worst outcome. ReHT beyond 5 years after initial HT portended similar results as primary HT (weighted HR, 1.14; 95%CI, 0.86-1.50; P<.001). CONCLUSIONS: ReHT was associated with higher mortality than HT, especially when indicated for acute rejection. ReHT beyond 5 years had a similar prognosis to primary HT.

Malignancy following heart transplantation: differences in incidence and prognosis between sexes - a multicenter cohort study.

Male patients are at increased risk for developing malignancy postheart transplantation (HT); however, real incidence and prognosis in both genders remain unknown. The aim of this study was to assess differences in incidence and mortality related to malignancy between genders in a large cohort of HT patients. Incidence and mortality rates were calculated for all tumors, skin cancers (SCs), lymphoma, and nonskin solid cancers (NSSCs) as well as survival since first diagnosis of neoplasia. 5865 patients (81.6% male) were included. Total incidence rates for all tumors, SCs, and NSSCs were lower in females [all tumors: 25.7 vs. 44.8 per 1000 person-years; rate ratio (RR) 0.68, (0.60-0.78), P < 0.001]. Mortality rates were also lower in females for all tumors [94.0 (77.3-114.3) vs. 129.6 (120.9-138.9) per 1000 person-years; RR 0.76, (0.62-0.94), P = 0.01] and for NSSCs [125.0 (95.2-164.0) vs 234.7 (214.0-257.5) per 1000 person-years; RR 0.60 (0.44-0.80), P = 0.001], albeit not for SCs or lymphoma. Female sex was associated with a better survival after diagnosis of malignancy [log-rank p test = 0.0037; HR 0.74 (0.60-0.91), P = 0.004]. In conclusion, incidence of malignancies post-HT is higher in males than in females, especially for SCs and NSSCs. Prognosis after cancer diagnosis is also worse in males.

Gender differences in heart transplantation: Twenty-five year trends in the nationwide Spanish heart transplant registry.

The study of gender differences may lead into improvement in patient care. We have aimed to identify the gender differences in heart transplantation (HT) of adult HT recipients in Spain and their evolution in a study covering the years 1993-2017 in which 6740 HT (20.6% in women) were performed. HT indication rate per million inhabitants was lower in women, remaining basically unchanged during the 25-year study period. HT rate was higher in men, although this decreased over the 25-year study period. Type of heart disease differed in men versus women (p < .001): ischemic heart disease 47.6% versus 22.5%, dilated cardiomyopathy 41.3% versus 34.6%, or other 36% versus 17.8%, respectively. Men were more frequently diabetics (18% vs. 13.1% p < .001), hypertensives (33.1% vs. 24% p < .001), and smokers (21.7% vs. 12.9% p < .001), respectively. Women had more pre-HT malignancies (7.1% vs. 2.8% p < .001), and their clinical status was worse at HT due to renal function and mechanical ventilation. Adjusted survival (p = .198) and most of the mortality-related variables were similar in men and women. Death occurred more frequently in women due to rejection (7.9% vs. 5.1% p < .001) and primary failure (18.2% vs. 12.5% p < .001) and in men due to malignancies (15.1% vs. 6.6% p < .001).

Consensus document and recommendations on palliative care in heart failure of the Heart Failure and Geriatric Cardiology Working Groups of the Spanish Society of Cardiology.

Heart failure is a complex entity, with high morbidity and mortality. The clinical course and outcome are uncertain and difficult to predict. This document, instigated by the Heart Failure and Geriatric Cardiology Working Groups of the Spanish Society of Cardiology, addresses various aspects related to palliative care, where most cardiovascular disease will eventually converge. The document also establishes a consensus and a series of recommendations with the aim of recognizing and understanding the need to implement and progressively apply palliative care throughout the course of the disease, not only in the advanced stages, thus improving the care provided and quality of life. The purpose is to improve and adapt treatment to the needs and wishes of each patient, who must have adequate information and participate in decision-making.

Use of Idarucizumab to reverse the anticoagulant effect of dabigatran in cardiac transplant surgery. A multicentric experience in Spain.

BACKGROUND: Anticoagulation in heart transplant (HT) recipients increases the risk of hemorrhagic complications, so correct reversal of anticoagulation is needed. Dabigatran, a direct thrombin inhibitor, is increasingly used for anticoagulation in patients with non-valvular atrial fibrillation (NVAF) whose effect can be reversed by idarucizumab. AIM: To present a nationwide experience using idarucizumab for the urgent reversal of dabigatran before HT. METHODS: Multicenter observational study in 12 Spanish centers to analyze the clinical outcomes after using idarucizumab before HT surgery. RESULTS: Fifty-three patients were included (81.1% male). 7.5% required re-operation in the immediate postoperative period to control bleeding and 66% transfusion of blood products. Median length of stay in the intensive care unit was 6 days and total hospital stay 24 days. 30-day survival was 92.4%. There were four deaths in the first month, all in the first 5 days post-HT. Only in one patient (transplanted due to a congenital heart disease, after sternotomy) who had surgical problems and right ventricular failure post-HT death was associated with bleeding. CONCLUSIONS: These results may support the use of dabigatran as an alternative to vitamin K antagonists in patients listed for HT requiring anticoagulation due to NVAF. More studies are needed to reaffirm these observations.

Gene variants in the NF-KB pathway (NFKB1, NFKBIA, NFKBIZ) and risk for early-onset coronary artery disease.

The nuclear-factor kappa-beta (NF-KB) is a driver of inflammation, and plays an important role in the pathogenesis of atherosclerosis and coronary artery disease (CAD). Early-onset CAD is defined as a coronary ischaemic episode at an age ≤55 years, and in our population was strongly associated with male sex and smoking. Our aim was to determine whether common variants in three NF-KB genes were associated with early-onset CAD. We studied 609 patients with early-onset CAD and 423 healthy controls, all male. Allele and genotype frequencies for the NFKB1 rs28362491 (-94 delATTG) and NFKBIA rs8904 were not significantly different between the two groups. For the NFKBIZ rs3217713, the deletion allele was significantly more frequent in the patients than in controls (0.27 vs. 0.22; p = 0.004). Deletion-carriers were more frequent in the patients (p < 0.001), with an OR = 1.48 (95%CI = 1.15-1.90). We performed a multiple logistic regression (linear generalized model) with smoking, hypercholesterolemia, type 2 diabetes, hypertension, and the rs3217713 deletion carriers remained significantly associated with early-onset CAD (p = 0.01). In our population, the NFKBIZ variant was an independent risk factor for developing early-onset CAD.

Immunosenescence and inflammation characterize chronic heart failure patients with more advanced disease.

BACKGROUND: Chronic heart failure (CHF) is characterized by an inflammatory status with high levels of cytokines such as IL-6. We hypothesized that patients with CHF may develop immunosenescence due to inflammation and that this may be associated with a worse stage of the disease. METHODS AND RESULTS: We compared the immunological features of 58 elderly CHF patients (ECHF), 40 young CHF patients (YCHF), 60 healthy elderly controls (HEC) and 40 healthy young controls (HYC). We characterized leukocyte and lymphocyte subpopulations by flow cytometry, and IL-6 concentration by ELISA. The extent of CHF was classified according to functional and/or morphological criteria: New York Heart Association functional class, AHA/ACC heart failure stages, left ventricular ejection fraction, and left ventricular hypertrophy. CHF patients showed an increased number of leukocytes, neutrophils and monocytes, but a decreased number of lymphocytes. CHF patients had significantly lower levels of B-cells and CD4+ T-cells, increased NK-cells in YCHF, and increased CD8+ T-cells only in ECHF. CHF was associated with high differentiation in CD4+ and CD8+ T-lymphocyte subsets. Aging of T-lymphocyte subpopulations and high IL-6 levels were associated with a worse clinical status. IL-6 also correlated positively with the number of highly differentiated T-lymphocytes and with their accelerated aging. CONCLUSIONS: We conclude that CHF patients show a higher degree of immunosenescence than age-matched healthy controls. T-lymphocyte differentiation and IL-6 levels are increased in patients with an advanced clinical status and may contribute to disease impairment through a compromised adaptive immune response due to accelerated aging of their immune system.

Tratamiento de la sobrecarga de volumen en IC refractaria / Treatment of volume overload in refractory heart failure / Tratamento da sobrecarga de volume na insuficiência cardíaca refratária

La insuficiencia cardíaca es un problema de salud creciente debido al envejecimiento de la población y a la mejoría en el pronóstico de los pacientes con cardiopatía establecida. En los últimos años, han ido apareciendo nuevos tratamientos que intentan mejorar la situación clínica, la calidad de vida y la supervivencia de aquellos pacientes que desarrollan refractariedad a los diuréticos. El empleo de estos nuevos fármacos podría tener un impacto positivo en las situaciones agudas, pero no parece que aporten beneficios adicionales para los enfermos con insuficiencia cardíaca congestiva crónica. En estos casos, las técnicas de ultrafiltración extracorpórea y, sobre todo, la diálisis peritoneal parecen demostrar mejoría de la clase funcional, reducción en las tasas de hospitalización, mejoría en la calidad de vida y reducción de la mortalidad, siendo además coste-eficiente.

Heart failure is an increasing health problem due to the aging population and the improvement in the prognosis of patients with established heart disease. In recent years new treatments have emerged that seek to improve the clinical situation, the quality of life and survival of patients who develop refractoriness to diuretics. The use of these new drugs could have a positive impact on the acute but it would not provide additional benefits for patients with chronic congestive heart failure. In these cases, extracorporeal ultrafiltration techniques and especially peritoneal dialysis seem to show improvement in functional class, reduction in hospitalization rates, improved quality of life and reduction in mortality, besides being cost-efficient.

A insuficiência cardíaca é um problema crescente de saúde devido ao envelhecimento da população e a melhora do prognóstico dos pacientes com doença cardíaca estabelecida. Nos últimos anos, novos tratamentos surgiram que procuram melhorar a situação clínica, a qualidade de vida e sobrevida dos pacientes que desenvolvem refratariedade ao uso de diuréticos. O uso desses novos fármacos poderia ter um impacto positivo sobre os efeitos agudos, mas não oferecem benefícios adicionais para os pacientes com insuficiência cardíaca congestiva crônica. Nestes casos, as técnicas de ultrafiltração extracorpórea e, especialmente, a diálise peritoneal parecem mostrar melhoria da classe funcional, redução das taxas de hospitalização, melhoria da qualidade de vida e a redução da mortalidade, e tambémé custo-eficiente.

[Heart failure and heart transplant]. / Insuficiencia cardiaca y trasplante.

The mission of the Heart Failure and Transplantation Section of the Spanish Society of Cardiology is to study, to promote interest in, and to disseminate information about all aspects of myocardial dysfunction and heart transplantation. Heart failure is a highly prevalent condition that consumes a substantial proportion of healthcare resources. Consequently, there is considerable interest in the disorder. Numerous lines of clinical and preclinical research are actively being pursued and new ways of increasing knowledge about the disease are constantly being explored. The aim of this article was to describe the most recent developments concerning heart failure and its treatment. Firstly, the latest publications on chronic heart failure are analyzed. Then, there is a review of the most recent studies on resynchronization therapy and of clinical trials on acute heart failure. Thirdly, new developments in right heart dysfunction and pulmonary hypertension, and the findings of the Spanish Pulmonary Hypertension Registry are discussed. Finally, the latest information on ventricular assist devices and heart transplantation is presented. In addition, the most important data obtained from official transplantation registries (i.e. the Spanish Heart Transplantation Registry and the Spanish Post-Heart Transplantation Tumor Registry) are reviewed.

Mitochondrial DNA and TFAM gene variation in early-onset myocardial infarction: evidence for an association to haplogroup H.

The main objective of this research was to define the association between common mitochondrial DNA (mtDNA) polymorphisms and mitochondrial transcription A gene (TFAM) variants and myocardial infarction (MI) in patients with atherosclerotic diseased vessels. Ten mitochondrial polymorphisms that defined the nine common European haplogroups were genotyped in 500 male patients with early onset MI (<55 years) and at least one atherosclerotic coronary vessel (angiographically confirmed), and 500 healthy controls. In addition, we searched for DNA variants in the coding region of the TFAM gene and compared patients and controls for the allele and genotype frequencies. Early onset MI was strongly associated with male gender and tobacco smoking in our population. MtDNA haplogroup H (defined by allele 7028 °C) was significantly more frequent in a first group of patients (n = 250) compared to controls (n = 300), and the association was confirmed in a second group of only smokers (250 patients and 200 controls). For total patients and controls, we obtained a p = 0.002 (OR = 1.50; 95% CI = 1.17-1.92) for H vs. the other haplogroups. We found four common TFAM polymorphisms, with allele/genotype frequencies that did not differ between patients and controls. In conclusion, mitochondrial haplogroup H was associated with early onset MI in male smokers. Our work supported a role for the mtDNA variation in the risk for atherosclerosis and ischemic associated events, likely due to differences in mitochondrial function and reactive oxygen production between the different haplogroups.

Papel de la diálisis peritoneal en el tratamiento de la insuficiencia cardíaca / Role of peritoneal dialysis in the treatment of heart failure / Papel da diálise peritoneal no tratamento da insuficiência cardíaca

Introducción. La insuficiencia cardíaca (IC) es una patología progresiva incluso con tratamiento adecuado. La eliminación de líquido ayuda en el manejo de estos pacientes. Evaluamos la eficacia de la diálisis peritoneal (DP) para tratar la IC refractaria. Pacientes y métodos. Estudio prospectivo no randomizado en pacientes con IC refractaria a dosis máximas toleradas de fármacos. Todos fueron tratados con DP. Se analizaron datos clínicos y estado funcional. Para determinar su eficacia se comparó el estado de salud percibido en los pacientes con DP respecto a los reportes de aquéllos que utilizaban tratamientos conservadores. Finalmente, se realizó un estudio de coste-utilidad. Resultados. Fueron incluidos 25 pacientes (68% varones, 66±10 años) y 16 siguieron en DP a la finalización del período de seguimiento (20±9 meses). Realizaron un solo intercambio nocturno 21 pacientes; el resto 2 ó 3 en relación al grado de insuficiencia renal. Todos mejoraron su estado funcional (4% tres grados, 64% dos y 32% uno; P<0,001); se redujo la presión sistólica en la arteria pulmonar (46±12 vs 25±9 mm Hg; P=0,007). Las tasas de hospitalización disminuyeron de forma importante (de 65±16 a 9±5 días/paciente/año; P=0,002). La expectativa de vida fue del 84% al año de tratamiento y del 72% y 58% tras 18 y 24 meses, respectivamente. La DP se asoció a mejor percepción del estado de salud que los tratamientos conservadores (0,6978 vs 0,4104; P<0,01). La DP es coste-efectiva comparada con los regímenes diuréticos. Conclusiones. La DP es una buena opción para el manejo del paciente con IC refractaria; mejora el grado funcional y la calidad de vida y reduce la hospitalización, mortalidad y los costes sanitarios.

Background. Heart failure (HF) is a progressive disorder even with adequate treatment. Fluid removal may aid in the management of these patients. We evaluated the efficacy of peritoneal dialysis (PD) in the treatment of refractory HF. Patients and methods. Prospective, non-randomized study involving patients with congestive HF refractory to maximum tolerable drug treatment. All of them were treated with PD. We analysed clinical data and functional status. To determine efficacy we compared the perceived state of health to PD patients respect to those reported with conservative therapies. Finally, we carried out a cost-utility evaluation. Results. Twenty-five patients (68% men, 66±10 years) were included and 16 were still undergoing PD at the end of the follow-up period (20±9 months). Twenty-one patients underwent only one daily nocturnal exchange; the rest, 2 or 3 exchanges due to different degrees of renal failure. All of them improved their NYHA functional status, (4% three classes, 64% two, 32% one; P<0.001), with a reduction in their pulmonary artery systolic pressure (46±12 vs 25±9 mm Hg; P=0.007). Hospitalization rates underwent a dramatic reduction (from 65±16 to 9±5 days/patient/year; P=0.002). PD life expectancy was 84% after 12 months of treatment, and 72% and 58% after 18 and 24 months. PD was associated with a higher perception state of health than the conservative therapy, (0.6978 vs 0.4104; P<0.01). PD is cost-effective compared with the diuretic regimens. Conclusions. PD is a good option for patients with refractory HF; it improves the functional status and quality of life, reduces morbidity, mortality and health care costs.

Introdução. A insuficiência cardíaca (IC) é uma patologia progressiva, mesmo com tratamento adequado. A remoção do líquido pode auxiliar no tratamento desses pacientes. Nós avaliamos a eficácia da diálise peritoneal (PD) no tratamento da insuficiência cardíaca refratária. Pacientes e métodos. Estudo prospectivo, não randomizado envolvendo pacientes com insuficiência cardíaca congestiva refratária ao tratamento medicamentoso máximo tolerado. Todos foram tratados com DP. Nós analisamos dados clínicos e estado funcional. Nós determinamos a eficácia, comparando o estado de saúde em PD em comparação com relação aos relatados com tratamento conservador. Finalmente, foi realizada uma avaliação de custo-utilidade. Resultados. Foram incluídos 25 pacientes (68% homens, 66±10 anos) e 16 estavam ainda em fase de PD no final do período de follow-up (20±9 meses). Vinte e um pacientes foram submetidos a apenas uma troca diária noturna, o resto, as trocas de 2 ou 3 devido a diferentes graus de insuficiência renal. Todos melhoraram seu status funcional da NYHA (4% três graus, 64% dois y 32% um; P<0,001); com uma redução da sua pressão sistólica da artéria pulmonar (46±12 vs 25±9 mm Hg; P=0,007). As taxas de hospitalização decresceram significativamente (de 65±16 a 9±5 dias/paciente/ano; P=0,002). A expectativa de vida era de 84% por ano de tratamento e 72% e 58% após 18 e 24 meses, respectivamente. PD foi associada com um estado de maior percepção de saúde do que o tratamento conservador (0,6978 vs. 0,4104; P<0,01). O DP é custo-utilidade em comparação com os regimes de diuréticos. Conclusàµes. O DP é uma boa opção para o manejo de pacientes com IC refratária, que melhora o estado funcional e qualidade de vida, reduz a internação, mortalidade e custos de saúde.

Intimal dehiscence during endovascular treatment of thoracic aortic dissection.

Endovascular treatment of thoracic aortic pathology has become a valuable alternative therapeutic option to open surgery, however complications both during implantation and the postoperative period may occur. In this case report we present an intimal dehiscence during endovascular procedure. Diagnosis was made by transoesophageal echocardiography.

Post-transplant soluble MICA and MICA antibodies predict subsequent heart graft outcome.

The objective of this retrospective study was to evaluate the role of MICA in heart graft acceptance. Pre- and post-transplant sera from 31 patients were evaluated for MICA antibodies by cytotoxicity on recombinant cell lines and soluble MICA (sMICA) concentrations by ELISA. The results demonstrated that the patients with post-transplant anti-MICA antibodies were at a high risk for the development of severe acute rejection (AR) (p<0.03; OR=8.5). However, the presence of post-transplant sMICA was found to be associated with functioning grafts without AR episodes (p<0.03, OR=7.9). In this preliminary survey, the negative association of sMICA with AR was found to be in the absence of MICA antibodies. Further research is needed to clarify the role of sMICA in allograft acceptance. Post-transplant evaluation of humoral immune response to MICA and the measure of sMICA in patient's sera may provide a good predictor of AR.

The predictive value of soluble major histocompatibility complex class I chain-related molecule A (MICA) levels on heart allograft rejection.

BACKGROUND: Recently the presence of a soluble form of major histocompatibility complex class I chain-related molecule A (sMICA) has been detected in the sera of patients with tumors. Shedding of sMICA by tumor cells downregulates NKG2D-mediated antitumor immunity. The aim of this investigation was to study the possible involvement of sMICA in the allograft acceptance after heart transplantation (HTX). METHODS: We monitored the levels of sMICA by specific enzyme-linked immunosorbent assay (ELISA) in a total of 146 serum samples obtained from 34 heart transplantation patients followed up during the first year post-HTX. RESULTS: The persistence of sMICA expression was correlated with the clinical evolution of these patients. sMICA was detected in the serum of 21 of 34 patients (61.70%) between 15 and 20 days after implantation and was practically absent in pretransplant serum samples. Twenty of these 21 patients (95.24%) with sMICA did not experience episodes of severe rejection during this period (P = 0.0001), whereas sMICA was practically absent in patients with manifestations of severe acute rejection. The longitudinal study of these patients revealed that the presence of sMICA was consistently maintained in 75% of the patients with good graft status during the period of observation. CONCLUSION: This has led us to believe that the presence of levels of sMICA during the first year post-HTX may contribute to allograft acceptance. Additionally, functional studies indicate that sMICA downregulates NKG2D surface expression, which may lead to a functional impairment of cell-mediated cytolysis. These data suggest a significant correlation between the presence of sMICA and a lower incidence of rejection.

An incidental finding during cardiac catheterization.

Coronary artery obstruction during cardiac catheterization is rare. It is a serious complication and has been reported to occur in 0.15 to 0.5% of cases. Thromboembolism, air embolism and coronary dissection have been described as the most common causes of intraprocedural coronary occlusion. Aortic valve masses can also cause coronary obstruction. We report the case of a young woman with a complication and an incidental finding during angiographic procedure. A surgical treatment was needed.