Systemic inflammatory response to cardiac surgery: does female sex really protect?

Sex hormones have important interactions with the immune system and modulate the inflammatory response. In this regard, oestrogen inhibits the transcription of proinflammatory cytokines and confers tissue protection in experimental models. On the basis of this evidence, Trotter et al. in this issue of Critical Care addressed the question of whether, in children, female sex would protect against the deleterious effects of cardiac operations with cardiopulmonary bypass by providing a favourable anti-inflammatory cytokine balance. The observations made in that study suggest sex-related immunomodulation and organ protection during cardiac surgery in the paediatric population. Prospective trials conducted in large series, including sex hormone determination in neonates, infants and children with congenital cardiac defects, are necessary to test this hypothesis. The verification of sex-related intraoperative organ protection would provide new opportunities for preventing the uncontrolled systemic inflammatory response that may occur during cardiac surgery

When an encircling aortic arch anomaly hides behind respiratory and digestive symptoms in children

peer reviewedLes anomalies de l’arc aortique, relativement fréquentes, représentent 15 à 20 % de toutes les maladies cardiovasculaires congénitales. Elles peuvent être découvertes face à des symptômes de compression oesophagienne et/ou des voies respiratoires, tels que dysphagie, toux chronique, stridor, wheezing, voire infections respiratoires à répétition. Nous rapportons deux cas d’anomalie encerclante des arcs aortiques. Le premier patient, âgé de 3 ans, présentait, depuis l’âge de 4 mois, des symptômes respiratoires avec multiples épisodes étiquetés de laryngites et d’asthme. Le deuxième, âgé de 20 mois, présentait un stridor intermittent, de la dysphagie ainsi que des vomissements fréquents. Chez ces deux patients, le scanner cervico-thoracique démontra un arc aortique droit avec une artère sous-clavière gauche rétro-oesophagienne au départ d’un diverticule de Kommerell. Dans les deux cas, la cure chirurgicale fut suivie de la disparition des symptômes. La compréhension du développement embryologique normal et anormal des arcs aortiques, ainsi que la connaissance des manifestations cliniques des compressions vasculaires sont indispensables à leur diagnostic précoce et traitement adéquat.Aortic arch anomalies are relatively frequent and account for 15 to 20 % of all congenital cardiovascular malformations. They can be discovered in case of symptoms of airway- or esophageal compression such as dysphagia, chronic cough, stridor, wheezing and recurrent respiratory infections. We report the cases of two children with encircling aortic arch anomaly. The 3-year-old boy had complained of chronic respiratory symptoms such as laryngitis and asthma since the age of 4 months. The 20-month-old boy presented with intermittent stridor, dysphagia and frequent vomiting. In both patients, the cervico-thoracic CT-scan showed a right aortic arch with retro-esophageal left subclavian artery and Kommerell’s diverticulum. Surgery was curative. The understanding of normal and abnormal embryologic development of the aortic arch, and the knowledge of the different types of vascular compression and their clinical signs are mandatory for the early diagnosis and adequate treatment of such malformations

Роль фторидной технологии при производстве карбида титана

peer reviewedBACKGROUND: Physical inactivity is a major atherosclerosis risk factor. The exercise tolerance is usually excellent after neonatal arterial switch operation, but those patients in whom coronary anomalies remain the main late complication, risk developing atherosclerotic coronary disease owing to perceived physical activity restrictions. METHODS: We investigated physical activity patterns of 52 unselected children 7 to 14 years after neonatal arterial switch operation for transposition of the great arteries by 24-hour continuous heart rate monitoring. The percentage of heart rate reserve was used to measure the amounts of activities. Comparisons were made with 35 children with repaired atrial or ventricular septal defect and with 127 age-matched healthy children. RESULTS: Children after arterial switch operation accumulated 167.3 +/- 70.6, 25.3 +/- 12.9, and 15.7 +/- 11.3 minutes a day (mean +/- SD) of light, moderate, and vigorous physical activities, respectively. At the same activity levels, children with repaired septal defect accumulated 165.2 +/- 82.2, 26.2 +/- 11.7, and 16.2 +/- 9.1 minutes a day, and their healthy peers 164.8 +/- 74.5, 31.8 +/- 13.9, and 21.9 +/- 11.3 minutes a day. Both cardiac groups were significantly less active than the control group when considering moderate (p = 0.026) and vigorous activities (p = 0.006). Only 19% and 27% of the children after arterial switch operation engaged, respectively, in more than 30 minutes a day of moderate activity and 20 minutes a day of vigorous activity. CONCLUSIONS: Children after arterial switch operation, just like other cardiac children, do not meet the guidelines for physical activity. We should encourage regular physical activity to offset adult sedentary behavior and to prevent atherosclerotic cardiovascular disease in those patients whose long-term function of the coronary arteries remains a matter of concern

Study of internal stresses in a TWIP steel analyzing transient and permanent softening during reverse shear tests.

Recent Bauschinger-type tests conducted on a twinning-induced plasticity (TWIP) steel highlights the important contribution of internal stresses to work hardening [1]. Along this line we present Bauschinger experiments in a Fe-22Mn wt.%-0.6C wt.% TWIP steel. The mechanical behaviour upon load reversal shows transient and permanent softening effects. Determination of the internal stress from the magnitude of the permanent softening yields a contribution to work hardening of the order of 20%. Analysis of the transient softening, during strain reversal, indicates that internal stress are consistent with reported data on high carbon spheroidized steels.Acknowledgements The authors would like to acknowledge the financial support by the German Research Foundation within the framework of the SFB 761 ‘‘steel ab initio’’ and the CICYT grant MAT2009-14452 awarded by the Spanish Ministry of Science and Innovation.Peer reviewe

Ebstein's anomaly : from fetal diagnosis to surgical treatment

peer reviewedEbstein's anomaly is a rare and complex congenital heart disease involving abnormal embryological development of the tricuspid valve. Its exact prevalence remains unknown given the under-diagnosis of minor forms and the broad clinical spectrum of this pathology resulting from the highly variable tricuspid morphology. Echocardiography plays an important role in diagnosis, assessment and prognostic evaluation of this condition. We present the case of a 6-year-old boy born from a twin pregnancy with a severe neonatal EA diagnosed by ultrasound at 29 weeks of gestation and we discuss the management on the light of the recent literature

Influence of age on clinical presentation, diagnosis delay and outcome in pre-school children with acute appendicitis

peer reviewedBACKGROUND: Unusual clinical presentation of acute appendicitis in preschool children leads to misdiagnosis and complications. We aimed to analyze the influence of age on clinical presentation, laboratory findings and complications in preschool children with acute appendicitis. METHODS: From January 2012 until December 2017, 29 children younger than 6 years of age (median 50 months) with acute appendicitis were enrolled in this retrospective study. Patients were grouped according to their age: group 1:  48 months (n = 16), their clinical data, laboratory results and complications were compared. RESULTS: In group 1, duration of nausea and vomiting was longer, alteration of general state was more frequent and pain in the right fossa iliaca less frequent than in group 2 (p = 0.026, p = 0.000 and p = 0.029, respectively). Heart rate was higher in group 1 than in group 2 (p = 0.012). Leucocyte and polynuclear neutrophil counts were lower in group 1 than in group 2 (p = 0.028 and = 0.004, respectively) but C-reactive protein levels were not different between groups. In the whole cohort however, C-reactive protein at admission value correlated negatively with age (p = 0.025). Abdominal ultrasound allowed diagnosis in 19/29 patients (65.5%), without any difference between groups. Appendicular perforation was more frequent in group 1 than in group 2 (p = 0.003). Perforation was also related to longer hospital stay (p = 0.018). Peritonitis occurred in 21/29 (72%), post-operative ileus in 5/29 (17%) and sepsis in 4/29 (14%) patients without any difference between groups. In the whole cohort, hospital stay correlated negatively with age (p = 0.000). There was no mortality. CONCLUSIONS: Among preschool children, those younger than 48 months present with longer duration of pre-admission symptoms indicating longer infection course than in older children. Altered general state and higher degree of tachycardia in the younger reflect higher systemic repercussions of the illness. Less specific abdominal pain and dissociation of the inflammatory markers with lower leucocyte- and neutrophil counts and higher C-reactive protein levels in the younger may contribute to further diagnosis delay and higher rate of perforation in these patients

Congenital diaphragmatic hernia in an infant: Don't miss the diagnosis!

editorial reviewedThis case illustrates a late-presenting CDH with gastrointestinal symptoms and failure to thrive. Late-presenting CDH is a rare and often misdiagnosed condition. Physicians should suspect it when GI and/or respiratory symptoms do not respond to usual management. Conclusio

Uni-ventricular palliation vs. bi-ventricular repair: differential inflammatory response.

peer reviewed[en] BACKGROUND: To examine whether uni-ventricular palliation (UVP) and bi-ventricular repair (BVR) result in a different pattern of systemic inflammatory response to pediatric cardiac surgery with extra-corporeal circulation (ECC). METHODS: In 20 children (median age 39.5 months) undergoing either UVP (n = 12) or BVR (n = 8), plasma levels of the inflammatory cytokines TNF-α, IL-6, IL-10, and IL-12 and of procalcitonin (PCT), were measured before, during and after open cardiac surgery up to postoperative day (POD) 10. RESULTS: Epidemiologic, operative- and outcome variables were similar in both groups but post-operative central venous pressure that was higher in UVP. In the whole cohort, the inflammatory response was characterized by an early important, significant and parallel increase of IL-6 and IL-10 that reached their peak values either at the end of ECC (IL-10) or 4 h postoperatively (IL-6), respectively and by a significant and parallel decrease of TNF-α and IL-12 levels after connection to ECC, followed by a bi-phasic significant increase with a first peak 4 h after ECC and a second at POD 10, respectively. Patients after UVP showed a shift of the cytokine balance with lower IL-6- (p = 0.01) after connection to ECC, lower early post-operative TNF-α - (p = 0.02) and IL-12- (p = 0.04) concentrations and lower TNF-α/IL-10-ratio (p = 0.03) as compared with patients with BVR. Levels of PCT were similar in both groups. CONCLUSIONS: UVP is associated with an anti-inflammatory shift of the inflammatory response to cardiac surgery that might be related to the particular hemodynamic situation of patients with UVP

Effect of the Ti-6Al-4V alloy specimens crystal lattice curvature within surface layers on fatigue failure mechanisms

In the present work the role of the crystal lattice curvature in fatigue failure of Ti-6Al-4V alloy specimens was discussed. The effect of the specimens ultrasonic treatment and further electrolytic hydrogenation on their fatigue properties was revealed. It was found that the crystal lattice curvature resulted in the fatigue durability increase due to a grain boundary sliding at the boundaries of strongly dispersed phases as well as the decrease one by reason of the brittle intermetallic phase of Ti3Al precipitation or the stabilization by hydrogen of the strong BCC ß phase depending on the Ti-6Al-4V specimens structure and phase composition