Outcomes of rapid deployment aortic valve replacement with concomitant cardiac procedures.

Background: Rapid deployment aortic valve replacement (RD-AVR) has been recently introduced with encouraging results. Outcomes of isolated RD-AVR include good hemodynamic profile, facilitation of minimally invasive techniques, and reduction of surgical times. However, role of this prosthesis in concomitant surgery is not well known. Methods: In 2016, we formed a registry to monitor the introduction of this prosthesis, RApid Deployment Aortic Replacement (RADAR). We aim to report mid-term outcomes focusing on patients who had RD-AVR combined with other surgical procedures. Results: Between July 2012 and February 2021, 370 patients were included in this registry (mean age, 75.8±8.0 years; 64.32% male; mean EuroSCORE II, 3.5±2.8). Of these, 128 (34.59%) had concomitant procedures including myocardial revascularization surgery in 69 patients (53.91%), surgery on the ascending aorta in 34 (26.56%), and procedures on other valves in 10 patients (7.81%). There were no significant differences between the isolated AVR and concomitant AVR groups in postoperative complications, in-hospital mortality (4.72% vs. 3.32%, P=0.524), or hemodynamic behavior of these prostheses. Three-year survival was 83.73% and 89.89% in the isolated and concomitant AVR group respectively. There was no difference in survival between the two groups (log-rank test, P=0.4124). Conclusions: Our results support the safety and efficacy of the Edwards INTUITY valve system even in complex aortic valve disease with additional cardiac procedures. RD-AVR could become a useful tool for concomitant surgeries where surgical times are expected to be prolonged.

Age and Sex Determine Electrocardiogram Parameters in the Octodon degus.

Cardiovascular diseases represent the leading cause of mortality and morbidity worldwide, and age is an important risk factor. Preclinical models provide supportive evidence toward age-related cardiac changes, as well as allow for the study of pathological aspects of the disease. In the present work, we evaluated the electrocardiogram (ECG) recording in the O. degus during the aging process in both females and males. Taking into account the age and sex, our study provides the normal ranges for the heart rate, duration and voltage of the ECG waves and intervals, as well as electrical axis deviation. We found that the QRS complex duration and QTc significantly increased with age, whereas the heart rate significantly decreased. On the other hand, the P wave, PR and QTc segments durations, S wave voltage and electrical axis were found to be significantly different between males and females. The heart rhythm was also altered in aged animals, resulting in an increased incidence of arrhythmias, especially in males. Based on these results, we suggest that this rodent model could be useful for cardiovascular research, including impacts of aging and biological sex.

Cardiac tyrosine hydroxylase activation and MB-COMT in dyskinetic monkeys.

The impact of age-associated disorders is increasing as the life expectancy of the population increments. Cardiovascular diseases and neurodegenerative disorders, such as Parkinson's disease, have the highest social and economic burden and increasing evidence show interrelations between them. Particularly, dysfunction of the cardiovascular nervous system is part of the dysautonomic symptoms of Parkinson's disease, although more studies are needed to elucidate the role of cardiac function on it. We analyzed the dopaminergic system in the nigrostriatal pathway of Parkinsonian and dyskinetic monkeys and the expression of some key proteins in the metabolism and synthesis of catecholamines in the heart: total and phosphorylated (phospho) tyrosine hydroxylase (TH), and membrane (MB) and soluble (S) isoforms of catechol-O-methyl transferase (COMT). The dopaminergic system was significantly depleted in all MPTP-intoxicated monkeys. MPTP- and MPTP + L-DOPA-treated animals also showed a decrease in total TH expression in both right (RV) and left ventricle (LV). We found a significant increase of phospho-TH in both groups (MPTP and MPTP + L-DOPA) in the LV, while this increase was only observed in MPTP-treated monkeys in the RV. MB-COMT analysis showed a very significant increase of this isoform in the LV of MPTP- and MPTP + L-DOPA-treated animals, with no significant differences in S-COMT levels. These data suggest that MB-COMT is the main isoform implicated in the cardiac noradrenergic changes observed after MPTP treatment, suggesting an increase in noradrenaline (NA) metabolism. Moreover, the increase of TH activity indicates that cardiac noradrenergic neurons still respond despite MPTP treatment.

Risk Factors for Postoperative Pacemaker Implantation After Rapid Deployment Aortic Valve Replacement: Results from the RADAR Registry.

INTRODUCTION: Rapid deployment aortic valve replacement has been recently introduced in clinical practice. Different studies have reported a significant reduction in surgical times with excellent hemodynamic profiles and short-term results. However, an increase in permanent pacemaker requirements compared with conventional aortic valve replacement has been described. Nevertheless, risk factors for postoperative pacemaker implantation are not well known. The aim of this study is to report our early outcomes with rapid deployment aortic valve replacement within the RADAR Registry, especially focusing on risk factors for postoperative pacemaker implantation. METHODS: Between April 2012 and January 2016, 164 patients undergoing isolated or combined aortic valve replacement with Edwards INTUITY Elite (Edwards Lifesciences, Irvine, CA, USA) were included in the RADAR Registry. Pre-, intra- and postoperative clinical data results and complications were recorded, especially focusing on risk factors for the development of postoperative complete or high-grade AV block requiring pacemaker implantation. Patients were followed up for up to 1 year with evaluation of clinical and echocardiographic outcomes. RESULTS: A total of 164 consecutive patients were included in this study, where 128 patients (78.05%) had an isolated aortic valve replacement (group 1) and 36 (21.95%) a concomitant procedure (group 2). The surgical approach was ministernotomy in 61 patients (37.20%) and median sternotomy in 100 patients (60.98%). Complications with valve implantation were observed in three patients. Postoperative complete or high-degree AV block requiring a permanent pacemaker implantation developed in ten patients (6.9%). Seven patients died in-hospital (4.27%). No significant differences between groups were found in terms of stroke, postoperative infection, mortality, atrial fibrillation and postoperative atrioventricular block. Seven patients presented acute renal impairment (5.51%) in group 1 versus seven patients (20%) in group 2 (p = 0.007). In multivariate analysis, low weight and preoperative arrhythmia (atrial fibrillation, bifascicular block, left bundle branch block) emerged as risk factors for postoperative AV block requiring a pacer. In median follow-up of 1 year, seven (4.27%) patients died, and no cases of structural valve deterioration or endocarditis were observed. Significant patient-prosthesis mismatch was found in seven (4.27%) patients. CONCLUSION: Initial experience with rapid deployment aortic valve replacement in the RADAR Registry demonstrates low rates of implantation complications and good perioperative and 1-year clinical and echocardiographic outcomes. Incidence of postoperative AV block requiring a pacer correlated with low weight and preoperative arrythmias (atrial fibrillation, bifascicular block and left bundle branch block). Avoidance of oversizing and careful consideration of implantation of this technology in patients with pre-existing arrythmias could minimize the risk for postoperative pacemaker implantation.

Postoperative Plasma Mitochondrial DNA and Cytokine Profiles of Elderly Patients Undergoing Minimally Invasive Aortic Valve Replacement.

INTRODUCTION: Mitochondrial DNA (mtDNA) is gaining increasing interest as a marker of cellular damage and could also act as an inflammatory mediator in cardiopulmonary bypass induced postoperative inflammatory response. Although minimally invasive heart valve surgery reportedly reduces inflammation, the mtDNA and cytokine profile in this context remains unclear. MATERIALS AND METHODS: Here, we report a prospective series of 40 elderly patients with aortic stenosis who underwent bioprosthetic aortic valve replacement (AVR) through upper ministernotomy with either a sutureless (n = 20) or a conventional (n = 20) valve. Primary end points included serial plasma levels of mtDNA (T1: at baseline; T2: 4 hours after surgery; and T3: 24s hour after surgery), cytokines (interleukin-6 [IL-6], tumor necrosis factor-α [TNF-α]), and myocardial necrosis biomarkers (MNBs), whereas secondary end points included clinical and echocardiographic data. RESULTS: Significant increases in the postoperative plasma levels (T2) of mtDNA, cytokines, and MNBs were observed in all patients. The postoperative plasma levels of mtDNA, TNF-α, and MNBs showed no significant differences between the treatment groups, although there was a trend toward lower levels in the sutureless group. The decreases in aortic cross-clamp and cardiopulmonary bypass times seen in the sutureless group were associated with significant lower postoperative levels (T2 and T3) of IL-6. CONCLUSION: AVR through upper ministernotomy was associated with a significant increase in postoperative plasma levels of mtDNA and cytokines. There was no difference in the mtDNA levels between the sutureless and conventional valve groups, suggesting a similar level of inflammation in both groups. However, the shorter operation time observed in the sutureless valve group was associated with significantly lower postoperative levels of IL-6, indicating potential clinical benefits.

Translational large animal model of hibernating myocardium: characterization by serial multimodal imaging.

Nonrevascularizable coronary artery disease is a frequent cause of hibernating myocardium leading to heart failure (HF). Currently, there is a paucity of therapeutic options for patients with this condition. There is a lack of animal models resembling clinical features of hibernating myocardium. Here we present a large animal model of hibernating myocardium characterized by serial multimodality imaging. Yucatan minipigs underwent a surgical casein ameroid implant around the proximal left anterior descending coronary artery (LAD), resulting in a progressive obstruction of the vessel. Pigs underwent serial multimodality imaging including invasive coronary angiography, cardiac magnetic resonance (CMR), and hybrid 18F-Fluorodeoxyglucose positron emission tomography-computed tomography (FDG-PET/CT). A total of 43 pigs were operated on and were followed for 120 ± 37 days with monthly multimodality imaging. 24 pigs (56%) died during the follow-up. Severe LAD luminal stenosis was documented in all survivors. In the group of 19 long-term survivors, 17 (90%) developed left ventricular systolic dysfunction [median LVEF of 35% (IQR 32.5-40.5%)]. In 17/17, at-risk territory was viable on CMR and 14 showed an increased glucose uptake in the at-risk myocardium on 18FDG-PET/CT. The present pig model resembles most of the human hibernated myocardium characteristics and associated heart failure (systolic dysfunction, viable myocardium, and metabolic switch to glucose). This human-like model might be used to test novel interventions for nonrevascularizable coronary artery disease and ischemia heart failure as a previous stage to clinical trials.

Cardiac Noradrenaline Turnover and Heat Shock Protein 27 Phosphorylation in Dyskinetic Monkeys.

BACKGROUND: Autonomic dysfunction is a well-known dominant symptom in the advanced stages of Parkinson's disease. However, the role of cardiac sympathetic nerves still needs to be elucidated. OBJECTIVES: To evaluate cardiac sympathetic response in Parkinsonian and dyskinetic monkeys. METHODS: Adult male monkeys were divided into 1 of the following 3 groups: controls, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-treated monkeys, and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine+levodopa-treated animals. Noradrenaline, its metabolite normetanephrine, and phospho-Heat shock proten 27 (p-Hsp27) at serine 82 levels were analyzed in the left and right ventricles of the heart. Tyrosine hydroxylase immunohistochemistry was performed in the ventral mesencephalon. RESULTS: The results were the following: (1) 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine intoxication significantly increased normetanephrine levels and decreased noradrenaline turnover in the right ventricle without changes in the left ventricle; however, (2) levodopa treatment decreased noradrenaline levels and enhanced the normetanephrine/noradrenaline ratio in parallel with a very significant increase of Hsp27 activity in both ventricles. CONCLUSIONS: Levodopa treatment could induce protective cardiac effects through the increased Hsp27 activity. © 2019 International Parkinson and Movement Disorder Society.

[Current surgical options and outcomes for newborns with hypoplastic left heart syndrome]. / Opciones quirúrgicas actuales y sus resultados en neonatos con síndrome de corazón izquierdo hipoplásico.

Since the first successful palliation was performed by Norwood et al. in 1983, there have been substantial changes in diagnosis, management, and outcomes of hypoplastic left heart syndrome, Survival for stage 1 palliation has increased to 90% in many centres, with patients potentially surviving into adulthood. However, the associated morbidity and mortality remain substantial. Although the principles of staged surgical palliation of hypoplastic left heart syndrome are well established, there is significant variability in surgical procedure and management between centres, and several controversial aspects remain unresolved. In this review, we summarize the current surgical and management options for newborns with hypoplastic left heart syndrome and their outcomes.

Opciones quirúrgicas actuales y sus resultados en neonatos con síndrome de corazón izquierdo hipoplásico / Current surgical options and outcomes for newborns with hypoplastic left heart syndrome

Desde que Norwood et al. efectuaron la primera paliación exitosa en 1983, ha habido cambios sustanciales en el diagnóstico, el manejo y el pronóstico del síndrome de corazón izquierdo hipoplásico. La supervivencia en el estadio i de la paliación quirúrgica ha aumentado hasta el 90% en muchas instituciones, con la posibilidad de sobrevivir hasta la vida adulta. No obstante, la morbimortalidad asociada continúa siendo sustancial. Aunque la premisa de la paliación quirúrgica por etapas del síndrome de corazón izquierdo hipoplásico está bien establecida, hay variaciones significativas en la técnica quirúrgica y el manejo entre distintos centros, y varios aspectos controvertidos siguen sin resolverse. En esta revisión resumimos las opciones quirúrgicas y de manejo disponibles actualmente para neonatos con síndrome de corazón hipoplásico, así como sus resultados

Since the first successful palliation was performed by Norwood et al. in 1983, there have been substantial changes in diagnosis, management, and outcomes of hypoplastic left heart syndrome, Survival for stage 1 palliation has increased to 90% in many centres, with patients potentially surviving into adulthood. However, the associated morbidity and mortality remain substantial. Although the principles of staged surgical palliation of hypoplastic left heart syndrome are well established, there is significant variability in surgical procedure and management between centres, and several controversial aspects remain unresolved. In this review, we summarize the current surgical and management options for newborns with hypoplastic left heart syndrome and their outcomes

Éxito de la cirugía combinada de trasplante bipulmonar y reparación de cardiopatía congénita en paciente pediátrico / Successful combined bilateral lung transplant and congenital heart disease repair in a pediatric patient

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Valve-Sparing Tetralogy of Fallot Repair With Intraoperative Dilation of the Pulmonary Valve. Mid-Term Results.

Deleterious long-term effects of chronic pulmonary regurgitation after repair of tetralogy of Fallot have become evident during the last decades. Subsequently, some groups have developed strategies to spare the pulmonary valve function at the time of repair with good early results. However, mid-term outcomes are scarce in the literature and in some cases controversial. The aim of our study is to report our results mid-term with valve-sparing repair of tetralogy of Fallot. We retrospectively reviewed patients undergoing tetralogy of Fallot repair and having preservation of the pulmonary valve with intraoperative dilation at our institution. From June 2009 through June 2017, 42 patients underwent valve-sparing tetralogy of Fallot repair. Median age and weight at surgery were 5.2 months and 7.2 kg. Median preoperative pulmonary valve diameters and Z scores by echocardiography were 6.4 mm (range 4.5-11 mm) and -2.3 (range -1.3 to -4.5). No patient died in our series. For a median follow-up of 45 months, the pulmonary valve has grown by Z score (P < 0.0001) as well as the pulmonary trunk (P= 0.00216). Significant pulmonary regurgitation has developed in 9 patients (21.4%). No patient has required reintervention/reoperation for recurrent right ventricular outflow tract obstruction. Patients with tetralogy of Fallot who had valve-sparing repair with intraoperative dilation of the pulmonary valve show good early and mid-term results with respect to right ventricular outflow tract obstruction. The pulmonary valve annulus and the pulmonary trunk grow through follow-up. Progressive development of significant pulmonary regurgitation is seen in more than 20% of patients. Long-term data with this approach and comparison with a population of patients undergoing a transannular patch repair are required to establish the real utility of this approach.

Prosthetic pulmonary valve and conduit endocarditis in congenital heart disease.

BACKGROUND: Pulmonary valve replacement is one of the most common procedures in patients with congenital heart disease. Little is known about prosthetic valve endocarditis in this population. OBJECTIVES: To review management and outcomes of pediatric and adult patients with a prosthetic pulmonary valve or right ventricle-to-pulmonary artery conduit infective endocarditis. METHODS AND RESULTS: A multiinstitutional cohort of 10 patients is reported. Median age at endocarditis was 24 years (range 8-41 years). The most common causative organisms were Staphylococcus ( n = 4) and Streptococcus species ( n = 2). In addition to medical treatment, 5 patients required surgery. Majors complications such as renal damage, life-threatening hemoptysis, and septic shock were observed. No patient died in hospital or during follow-up. CONCLUSIONS: Pulmonary prosthetic valve endocarditis is a rare condition associated with significant morbidity and a high risk of requiring operative intervention. Larger studies are required to optimize the management.

Mitochondrial DNA haplogroups influence the risk of aortic stenosis.

AIM: The underlying pathophysiologic mechanisms of aortic stenosis are not clear. Mitochondrial dysfunction plays a role in many pathological conditions including cardiac diseases. We aimed to analyze the mitochondrial DNA haplogroups in a group of patients undergoing valve replacement surgery due to severe aortic stenosis. METHODS: Mitochondrial DNA haplogroups were assessed in 176 patients with severe aortic stenosis and 308 control subjects. Cardiovascular risk factors and demographics were similar in both groups. RESULTS: Patients carrying haplogroup Uk had a lower risk of developing aortic stenosis, especially compared to patients carrying haplogroup H (odds ratio = 0.507; 95% confidence interval: 0.270-0.952, p = 0.035). CONCLUSIONS: Mitochondrial DNA haplogroups could be involved in the development of severe aortic stenosis. Specifically, haplogroup H could be a risk factor and Uk a protective factor for severe aortic stenosis in a population from Spain.

Mitral valve replacement via a left thoracotomy in dextrocardia and situs solitus.

Dextrocardia with situs solitus and severe mitral regurgitation is a rare clinical presentation which posse a surgical challenge and requires specific preoperative planning. A 54-year-old women with this anatomy, multiple thoracic procedures, and severe mitral valve regurgitation underwent successful mitral valve replacement with a 27-mm mechanical prosthesis through a left thoracotomy under ventricular fibrillation, on the basis of computed tomography findings. We emphasize the importance of preoperative planning and a surgical approach through a left thoracotomy and under ventricular fibrillation.

Cierre quirúrgico del ductus arterioso persistente del prematuro: ¿influye la técnica quirúrgica en los resultados? / Surgical closure of patent ductus arteriosus in premature neonates: Does the surgical technique affect the outcome?

INTRODUCCIÓN: El cierre quirúrgico del ductus arterioso persistente en el prematuro es una técnica agresiva y no exenta de complicaciones. Diseñamos un estudio con el objetivo de describir nuestra experiencia con una técnica menos invasiva, el abordaje extrapleural vía minitoracotomía posterior, y de comparar sus resultados con los del abordaje clásico transpleural. PACIENTES Y MÉTODOS: Estudio de cohortes retrospectivo de los neonatos prematuros a los que se les realizó cierre quirúrgico del ductus en un periodo de 10 años (marzo de 2005-marzo de 2015). Se compararon las complicaciones agudas, los resultados al alta y en el seguimiento entre los grupos de abordaje extrapleural y abordaje clásico transpleural. Se incluyó a 48 pacientes, 30 en el grupo de abordaje clásico y 18 en el grupo extrapleural. RESULTADOS: Las características demográficas y preoperatorias fueron similares en ambos grupos. No se encontraron diferencias entre los 2 grupos en la incidencia de complicaciones postoperatorias agudas (56,6 vs. 44,4%), en la dependencia de oxígeno a las 36 semanas (33,3 vs. 55,5%), ni en la mortalidad hospitalaria (10 vs. 16,6%). En la evolución a corto plazo, el grupo extrapleural precisó menos días hasta la retirada del oxígeno suplementario (36,3 vs. 28,9) y hasta el alta hospitalaria (67,5 vs. 53,2), aunque solo el tiempo hasta la extubación alcanzó una diferencia estadísticamente significativa (11,5 vs. 2,7, p = 0,03). CONCLUSIONES: El abordaje extrapleural por minitoracotomía posterior para el cierre quirúrgico del ductus en el prematuro es factible y podría conllevar algunos beneficios clínicos a corto plazo

INTRODUCTION: Surgical closure of patent ductus arteriosus in premature neonates is an aggressive technique and is not free of complications. A study was designed with the aim of describing our experience with a less invasive technique, the extra-pleural approach via a posterior minithoracotomy, and to compare the results with the classic transpleural approach. PATIENTS AND METHODS: A retrospective cohort study was conducted on premature neonates on whom surgical closure of the ductus was performed during a ten-year period (March 2005 to March 2015). A comparison was made of the acute complications, the outcomes on discharge, and follow-up, between the extra-pleural approach and the classic transpleural approach. The study included 48 patients, 30 in the classical approach and 18 in the extra-pleural group. RESULTS: The demographic and pre-operative characteristics were similar in both groups. No differences were found between the 2 groups in the incidence of acute post-operative complications (56.6 vs. 44.4%), on the dependence on oxygen at 36 weeks (33.3 vs. 55.5%), or in hospital mortality (10 vs. 16.6%). As regards the short-term progress, the extra-pleural group required fewer days until the withdrawal of supplementary oxygen (36.3 vs. 28.9) and until hospital discharge (67.5 vs. 53.2), although only the time until extubation achieved a statistically significant difference (11.5 vs. 2.7, P=.03). CONCLUSIONS: The extra-plural approach by posterior minithoracotomy for the surgical closure of ductus in the premature infant is viable and could bring some clinical benefits in the short-term

Indexed left atrial size predicts all-cause and cardiovascular mortality in patients undergoing aortic valve surgery.

OBJECTIVES: The enlargement of the left atrium has been identified as a marker of chronically increased left ventricular filling pressure and left ventricular diastolic dysfunction. This study aims to evaluate the association of indexed left atrial diameter with stroke, cardiovascular mortality, the combined event, and all-cause mortality in patients who underwent aortic valve surgery. METHODS: Indexed left atrial diameter was measured in 2011 adult patients (mean age, 70.9 ± 10.8 years; 58.7% were men) who underwent aortic valve surgery between January 2008 and March 2016. RESULTS: On the basis of the criteria of the American Society of Echocardiography, indexed left atrial diameter was normal in 64% of patients, mildly enlarged in 12.4% of patients, moderately enlarged in 9.2% of patients, and severely enlarged in 14.3% of patients. Over a mean follow-up period of 3.2 ± 2.1 years, there were 334 deaths and 97 strokes. Cardiovascular mortality survival at 5 years among patients with normal, mild, moderate, and severe left atrial enlargement was 91.6%, 86.8%, 77.9%, and 77.4%, respectively (P < .001). After covariable adjustment, Cox regression analysis showed indexed left atrial diameter as an independent predictor of all-cause mortality (hazard ratio per 1-cm/m2 increment, 1.545; 95% confidence interval, 1.252-1.906, P < .001), cardiovascular death (hazard ratio per 1-cm/m2 increment, 1.971; 95% confidence interval, 1.541-2.520; P < .001), and the combined event (hazard ratio per 1-cm/m2 increment, 1.673; 95% confidence interval, 1.321-2.119; P < .001). CONCLUSIONS: Indexed left atrial diameter is a strong predictor of long-term outcomes in patients with aortic valve diseases who undergo surgery.

Rapid Deployment Aortic Replacement (RADAR) Registry in Spain: a protocol.

INTRODUCTION: Rapid deployment valves (RDV) represent a newly introduced approach to aortic valve replacement which facilitates surgical implantation and minimally invasive techniques, shortens surgical times and shows excellent haemodynamic performance. However, evidence on their safety, efficacy and potential complications is mostly fitted with small-volume and retrospective studies. Moreover, no current guidelines exist. To improve our knowledge on this technology, The Rapid Deployment Aortic Replacement (RADAR) Registry will be established across Spain with the aim of assessing RDV outcomes in the real-world setting. METHODS AND ANALYSIS: The RADAR Registry is designed as a product registry that would provide information on its use and outcomes in clinical practice. This multicentre, prospective, national effort will initially involve 4 centres in Spain. Any patient undergoing cardiac surgery for aortic valve replacement and receiving an RDV as an isolated operation or in combination with other cardiac procedures may be included. Participation is voluntary. Data collection is equal to information obtained during standard care and is prospectively entered by the participating physicians perioperatively and during subsequent follow-up visits. The primary outcome assessed is in-hospital and up to 5 years of follow-up, prosthetic valve functioning and clinical status. Secondary outcomes are to perform subgroup analysis, to compare outcomes with other existing approaches and to develop future clinical guidelines. The follow-up assessments are timed with routine clinical appointments. Dissociated data will be extracted and collectively analysed. Initial target sample size for the registry is 500 participants entered with complete follow-up information. Different substudies will be implemented within the registry to investigate specific populations undergoing aortic valve replacement. ETHICS AND DISSEMINATION: The protocol is approved by all local institutional ethics committees. Findings will be shared by the participant hospitals, policymakers and the academic community to promote quality monitoring and efficient use of this technology.

[Surgical closure of patent ductus arteriosus in premature neonates: Does the surgical technique affect the outcome?] / Cierre quirúrgico del ductus arterioso persistente del prematuro: ¿influye la técnica quirúrgica en los resultados?

INTRODUCTION: Surgical closure of patent ductus arteriosus in premature neonates is an aggressive technique and is not free of complications. A study was designed with the aim of describing our experience with a less invasive technique, the extra-pleural approach via a posterior minithoracotomy, and to compare the results with the classic transpleural approach. PATIENTS AND METHODS: A retrospective cohort study was conducted on premature neonates on whom surgical closure of the ductus was performed during a ten-year period (March 2005 to March 2015). A comparison was made of the acute complications, the outcomes on discharge, and follow-up, between the extra-pleural approach and the classic transpleural approach. The study included 48 patients, 30 in the classical approach and 18 in the extra-pleural group. RESULTS: The demographic and pre-operative characteristics were similar in both groups. No differences were found between the 2 groups in the incidence of acute post-operative complications (56.6 vs. 44.4%), on the dependence on oxygen at 36 weeks (33.3 vs. 55.5%), or in hospital mortality (10 vs. 16.6%). As regards the short-term progress, the extra-pleural group required fewer days until the withdrawal of supplementary oxygen (36.3 vs. 28.9) and until hospital discharge (67.5 vs. 53.2), although only the time until extubation achieved a statistically significant difference (11.5 vs. 2.7, P=.03). CONCLUSIONS: The extra-plural approach by posterior minithoracotomy for the surgical closure of ductus in the premature infant is viable and could bring some clinical benefits in the short-term.