Cardiopulmonary Bypass In Children Research Articles

Update: Advances in Pediatric Cardiac Intensive Care

Update: Advances in Pediatric Cardiac Intensive Care

Prophylactic Peritoneal Dialysis Following Cardiopulmonary Bypass in Children Is Associated with Decreased Inflammation and Improved Clinical Outcomes

To investigate impact of prophylactic peritoneal dialysis (PD) on clinical outcomes and inflammatory cytokines in children following cardiac surgery with cardiopulmonary bypass. Prospective before-and-after nonrandomized cohort study. Pediatric cardiovascular intensive care unit in tertiary hospital. Fifty-two consecutive neonates and infants at high risk for postoperative fluid overload following cardiopulmonary bypass. All had PD catheters placed during primary cardiac surgery. Initial 27 patients were managed with passive peritoneal drainage and diuretics (controls). Following 25 patients were started on prophylactic PD in immediate postoperative period and managed per PD protocol (+PD). Cumulative fluid balance, indices of disease severity, and clinical outcomes were prospectively collected. Plasma interleukin-6 and interleukin-8 were measured immediately before-and-after cardiopulmonary bypass and at 24 and 48 hours post-cardiopulmonary bypass. Demographics, diagnoses, and intraoperative variables were similar. Median net fluid balance was more negative in +PD at 24 hours, -24 mL/kg (interquartile range: -62, 11) vs. +18 mL/kg (interquartile range: -26, 11), P = .003, and 48 hours, -88 mL/kg (interquartile range: -132, -54) vs. -46 mL/kg (interquartile range: -84, -12), P = .004. +PD had median 55 mL/kg less fluid intake at 24 hours, P = .058. Peritoneal drain, urine, and chest tube output were comparable over first 24 hours. Mean inotrope score was lower in +PD at 24 hours. +PD had earlier sternal closure--24 hours (interquartile range: 20, 40) vs. 63 hours (interquartile range: 44, 72), P < .001--and a trend toward shorter duration of mechanical ventilation--71 hours (interquartile range: 49, 135) vs. 125 hours (interquartile range: 70, 195), P = .10. +PD experienced lower serum concentrations of interleukin-6 and interleukin-8 at 24 hours. Prophylactic PD is associated with greater net negative fluid balance, decreased inotrope requirements, and lower serum concentrations of inflammatory cytokines in the early postoperative period.

Protective effect of esmolol on myocardial ischemic injury during open heart surgery in children

To investigate the efficacy of esmolol in protecting the myocardium from ischemia during pediatric cardiac surgery. Esmolol, an ultra-short acting beta 1-adrenoceptor blocker, reduces myocardial injury in adult cardiac operations. However, this technique is rarely used in pediatric cardiac surgery. Thirty children with ventricular septal defect were randomly allocated to the esmolol group and the control group. Patients received intravenous esmolol (0.05mg·kg(-1) ·min(-1) after tracheal intubation, 0.3 mg·kg(-1) ·min(-1) during cardiopulmonary bypass (CPB) and 0.03-0.05 mg·kg(-1) ·min(-1) until the end of surgery) or placebo, respectively. Plasma levels of creatine kinase-MB, cardiac troponin I in the esmolol group 2 min after completion of CPB, at the end of surgery, 4h after surgery, and the first postoperative day were significantly lower than those in the control group. Values of heart rate 10min after induction, 2min before institution of CPB, 2min after completion of CPB, and at the end of surgery were significantly lower in the esmolol group; however, mean arterial pressure, CPB time, cross-clamp time, and the rate of heart spontaneous rebeating were not statistically different between two groups. Cumulative postoperative dosage of dopamine in the esmolol group (100.1±53.1mg) was significantly less than that in the control group (171.4±92.1mg). Esmolol can protect the myocardium from ischemic injury during CPB in children and significantly reduce the use of inotropic drug.

Cerebral Perfusion During Cardiopulmonary Bypass in Children: Correlations Between Near‐Infrared Spectroscopy, Temperature, Lactate, Pump Flow, and Blood Pressure

Near-infrared spectroscopy (NIRS) is a noninvasive modality to monitor regional brain oxygenation (rSO(2) ). In this study, we aimed to investigate the correlation between cerebral rSO(2) and lactate, pump flow, hematocrit, pCO(2) , and mean blood pressure (MBP) during cardiopulmonary bypass (CPB). Between March and September 2011, 50 pediatric patients who underwent congenital heart surgery were enrolled into the study. Ages ranged from 6 days to 168 months (median 14 months). A NIRS sensor (Somanetics 5100B, Troy, MI, USA) was placed on the right forehead of patients. CPB period was divided into five stages: 1-at the beginning of CBP, 2-cooling at 32°C, 3-at final hypothermic temperature, 4-rewarming at 32°C, 5-before weaning from CPB. Data collection included measurements of each parameter at five stages of CPB. Data were analyzed using multivariate analysis within groups and Spearman's correlation to test association between parameters. Lactate levels increased significantly from stage 1 to stage 5 during CPB (P < 0.05). There was no significant correlation between cerebral rSO(2) and MBPs, pump flows, hematocrit, or pCO(2) during CPB. Cerebral rSO(2) levels showed changes between the stages; there was a significant increase during cooling period, compared to stage 1 (P < 0.05). Significant changes during cooling stage did not happen for other parameters. At stage 3, there was a negative correlation between lactate level and MBP. At stage 4, there was no significant change in cerebral rSO(2) levels despite decreased MBP. At the warming stage, low MBPs, but normal rSO(2) values, are observed despite increased pump flows. Increased rSO(2) levels despite insignificant changes at other parameters during the cooling stage of CPB may show that optimal pump flow with adequate intravascular volume may provide effective cerebral perfusion even without changes in MBP. Considering normal rSO(2) values during CPB in this study, it may be speculated that brain protection can be assessed by using NIRS and applying a standard bypass protocol.

The Effects of Multiple Doses of Glucocorticoids on the Inflammatory Response to Cardiopulmonary Bypass in Children

We previously demonstrated that a dose of glucocorticoids (GCs) administered prior to cardiopulmonary bypass (CPB) is effective at suppressing the inflammatory response to CPB and leads to an improved postoperative course. We evaluated whether an additional dose of GC administered eight hours prior to CPB would lead to further clinical benefit. We conducted a prospective study in which patients were randomized to receive placebo or GC eight hours prior to CPB, in addition to a dose of GC administered following induction of anesthesia. We measured serum inflammatory mediator levels and postoperative clinical parameters. Thirty-one patients were included in the study. Eighteen patients received two doses of GC and 13 patients received a single does of GC. Complement C3a levels were significantly lower at 24 hours following surgery in those patients who received two doses of GC (3136 ± 1650 vs 1779 ± 1616 ng/mL, P = .04). There was no significant difference in tumor necrosis factor (TNF)-α or interleukin (IL)-6 levels at any time between groups. There was no significant difference in core body temperature or renal function (based on serum creatinine levels) between groups. There was no significant difference between groups in duration of mechanical ventilation (2.4 ± 1.5 vs 3.6 ± 3.7 days, two vs one dose, respectively, P = .33) or length of stay in the intensive care unit ([ICU]; 3.4 ± 1.4 vs 4.9 ± 3.6 days, 2 vs 1 dose, respectively, P = .15). While those patients who received two doses of GC prior to surgery had significantly less complement activation postoperatively, clinical outcomes did not differ between groups. We conclude that the practice of administering an additional dose of GC prior to CPB is not supported. However, a large randomized study is needed to conclusively discount the potential benefit of this strategy.

Invited Commentary

The systemic inflammatory response syndrome is, at least partly, responsible for complications in children undergoing cardiac surgery with cardiopulmonary bypass (CPB), and has been the target of the prophylactic use of corticosteroids. The potential benefits and risks of corticosteroids remain controversial despite a widespread use for more than 30 years. Even though several trials demonstrated the ability of corticosteroids to modulate the inflammatory response related to CPB in children [1Schroeder V.A. Pearl J.M. Schwartz S.M. Shanley T.P. Manning P.B. Nelson D.P. Combined steroid treatment for congenital heart surgery improves oxygen delivery and reduces postbypass inflammatory mediator expression.Circulation. 2003; 107: 2823-2828Crossref PubMed Scopus (135) Google Scholar, 2Bronicki R.A. Backer C.L. Baden H.P. Mavroudis C. Crawford S.E. Green T.P. Dexamethasone reduces the inflammatory response to cardiopulmonary bypass in children.Ann Thorac Surg. 2000; 69: 1490-1495Abstract Full Text Full Text PDF PubMed Scopus (198) Google Scholar], a pediatric meta-analysis published in 2007 [3Robertson-Malt S. El Barbary M. Prophylactic steroids for paediatric open-heart surgery: a systematic review.Int J Evid Based Healthc. 2008; 6: 391-395Crossref PubMed Scopus (7) Google Scholar] found no clinical benefit, and highlighted the paucity of data on adverse events, in particular sepsis and bleeding. A very recent publication by Clarizia and associates [4Clarizia N.A. Manlhiot C. Schwartz S.M. et al.Improved outcomes associated with intraoperative steroid use in high-risk pediatric cardiac surgery.Ann Thorac Surg. 2011; 91: 1222-1227Abstract Full Text Full Text PDF PubMed Scopus (52) Google Scholar] has reported a significant reduction in length of stay when 30 mg/kg methylprednisolone was given intraoperatively, and a further reduction in the duration of mechanical ventilation when additional corticosteroids were given preoperatively. These were consistent with previous reports in children [1Schroeder V.A. Pearl J.M. Schwartz S.M. Shanley T.P. Manning P.B. Nelson D.P. Combined steroid treatment for congenital heart surgery improves oxygen delivery and reduces postbypass inflammatory mediator expression.Circulation. 2003; 107: 2823-2828Crossref PubMed Scopus (135) Google Scholar], but what was new in the publication by Clarizia and colleagues [4Clarizia N.A. Manlhiot C. Schwartz S.M. et al.Improved outcomes associated with intraoperative steroid use in high-risk pediatric cardiac surgery.Ann Thorac Surg. 2011; 91: 1222-1227Abstract Full Text Full Text PDF PubMed Scopus (52) Google Scholar] was the targeted use of steroids in younger and more complex patients (Aristotle score above 10), suggesting steroids would provide the most spectacular effect in young patients subjected to considerable inflammatory responses. The present study of Heying and colleagues [5Heying R. Wehage E. Schumacher K. et al.Dexamethasone pretreatment provides antiinflammatory and myocardial protection in neonatal arterial switch operation.Ann Thorac Surg. 2012; 93: 869-877Abstract Full Text Full Text PDF PubMed Scopus (53) Google Scholar] highlights a new aspect of the prophylactic use of corticosteroids in neonatal cardiac surgery: the protective myocardial effect. By showing lesser inflammation and lower cardiac troponin concentrations with the use of methylprednisolone, the present study directly relates post-CPB inflammation to myocardial protection. The present authors demonstrate the myocardial downregulation and upregulation of proinflammatory and antiinflammatory cytokines, respectively, with the prophylactic use of 1 mg/kg methylprednisolone given before CPB, and show effectiveness starting before onset of CPB and lasting throughout the procedure and the early postoperative period. We still have to answer the following questions: “What?,” “When?,” and “How much?,” especially as an international survey of 36 cardiac surgery centers revealed that despite the widespread use of corticosteroids in pediatrics, administration practices and dosing regimens are still the result of provider preferences [6Checchia P.A. Bronicki R.A. Costello J.M. Nelson D.P. Steroid use before pediatric cardiac operations using cardiopulmonary bypass: an international survey of 36 centers.Pediatr Crit Care Med. 2005; 6: 441-444Crossref PubMed Scopus (118) Google Scholar]. The steroid preparation responsible for fewer side effects, the best dosing regimen, and the best timing are still debated in pediatric cardiac surgery. Dexamethasone Pretreatment Provides Antiinflammatory and Myocardial Protection in Neonatal Arterial Switch OperationThe Annals of Thoracic SurgeryVol. 93Issue 3PreviewThis prospective double-blinded randomized study tested the hypothesis that preoperative treatment with dexamethasone would attenuate inflammatory priming of the myocardium, reduce the systemic inflammatory reaction upon cardiac operation, and provide organ protection in neonates. Full-Text PDF

The Variation in Plasma Cortisol Levels in Response to Anesthetic Induction with Etomidate or Ketamine in Children Undergoing Intracardiac Repair of Tetralogy of Fallot on Cardiopulmonary Bypass

Objective: To compare the effect of a single induction dose of etomidate or ketamine on plasma cortisol levels in children with Tetralogy of Fallot (TOF) undergoing intra-cardiac repair on cardiopulmonary bypass (CPB). Design: A prospective randomized trial. Setting: Cardiac center of a tertiary care hospital. Participants: Thirty children with TOF undergoing intra-cardiac repair on CPB. Interventions: After random allocation of the children into two groups, the children either received etomidate 0.2 mg/kg or ketamine 2 mg/kg intravenously for anesthetic induction along with fentanyl 2 mcg/kg and midazolam 100 mcg/kg. Endotracheal intubation was accomplished with rocuronium bromide in the dose of 1 mg/kg. Anesthesia was maintained with sevoflurane in air-oxygen, titrated to response and supplemental vecuronium bromide for muscle relaxation, fentanyl chloride for pain relief. Serum cortisol was measured on three occasions, at preinduction, at the end of surgery and at 24 hours postoperatively. Measurements and Main Results: Baseline plasma cortisol (Normal 5 - 25 mcg/dl) in the etomidate group (19.91 ± 3.51 mcg/dl) decreased significantly at the end of surgery (5.78 ± 2.0 mcg/dl) and rose to significantly higher than baseline values at 24 hours (27.31 ± 8.30 mcg/dl). The baseline cortisol levels in the ketamine group (20.91 ± 3.19 mcg/dl) increased significantly at the end of surgery (44.02 ± 5.49 mcg/dl) and remained significantly higher than baseline at 24hours (45.93 ± 3.05 mcg/dl). Plasma cortisol levels in the etomidate group at end of surgery, and at 24 hours post-operatively, were significantly lower than the ketamine group. Conclusions: This study shows that etomidate is a suitable and safe agent for suppression of the increase in serum cortisol associated with the use of CPB in children with TOF undergoing intra-cardiac repair.

Acute Kidney Injury in Children Undergoing Correction of Congenital Heart Disease

Objective To assess risk factors of acute kidney injury in congenital cardiac disease following cardiac surgery with cardiopulmonary bypass in children. Methods A 50% postoperative creatinine increase was regarded as the criterion of acute kidney injury. 124 children aged 3 years or little undergoing cardiac surgery were divided into three groups: (1) negative AKI (-); (2) AKI (+) with an increase in postoperative creatinine from 150% to 200%; and (3) AKI (++) with an increase in postoperative creatinine by more than 200%. Demographics, and preoperative, intraoperative, and postoperative variables were evaluated for associations with AKI using univariate and multiple logistic regression analysis. Results Several variables, including mortality, preoperative albumin and creatinine levels, cardiopulmonary bypass duration, and postoperative creatinine levels, were significant differences among the three groups (P &lt; 0.05). Multiple regression analysis demonstrated that three risk factors, age (OR, 0.962; 95% CI, 0.925 to 1.000; P = 0.046), intraoperative red blood cell transfusion (OR, 1.003; 95% CI, 1.001 to 1.005; P = 0.030), and cardiopulmonary bypass duration (OR, 1.024; 95% CI, 1.016 to 1.032; P = 0.000) were independently associated with AKI after cardiac surgery. Conclusions This study showed that younger age, incremental intraoperative red blood cell transfusion, and prolonged cardiopulmonary bypass duration were independently associated with acute kidney injury after cardiac surgery. The type of congenital cardiac disease should be included in the analysis of acute kidney injury.

Angiotensin-converting enzyme inhibition alters the inflammatory and fibrinolytic response to cardiopulmonary bypass in children*

Many children with a congenital heart defect undergo surgical correction requiring cardiopulmonary bypass. One-sixth of these patients take an angiotensin-converting enzyme inhibitor for heart failure treatment. The effect of angiotensin-converting enzyme inhibition on the fibrinolytic and inflammatory response in children undergoing cardiopulmonary bypass is unknown. In adults, angiotensin-converting enzyme inhibition attenuates the increase in plasminogen activator inhibitor-1 after cardiopulmonary bypass, whereas the effect on the interleukin-6 response is uncertain. This study tests the hypothesis that preoperative angiotensin-converting enzyme inhibition attenuates postoperative plasminogen activator inhibitor-1 and interleukin-6 expression after cardiopulmonary bypass in children. Single-center prospective, randomized, nonblinded study. University-affiliated pediatric hospital. Children undergoing elective surgical correction of a congenital heart defect requiring cardiopulmonary bypass and taking an angiotensin-converting enzyme inhibitor. Children were randomized to continue angiotensin-converting enzyme inhibitor until the morning of surgery (angiotensin-converting enzyme inhibitor group, n = 11) or to discontinue therapy 72 hrs before surgery (no angiotensin-converting enzyme inhibitor group, n = 9). Blood samples were collected at baseline before cardiopulmonary bypass, at 30 mins of cardiopulmonary bypass, on arrival to the intensive care unit, and on postoperative day 1. Baseline bradykinin concentrations were significantly higher and angiotensin-converting enzyme activity significantly lower in the angiotensin-converting enzyme inhibitor group compared with the no angiotensin-converting enzyme inhibitor group (p = .04 and .001, respectively). Plasminogen activator inhibitor-1 antigen increased 15-fold after cardiopulmonary bypass and peaked on postoperative day 1 (from 4.6 ± 1.2 to 67.7 ± 9.5 ng/mL; p < .001). Postoperative day 1 plasminogen activator inhibitor-1 antigen correlated significantly with cardiopulmonary bypass time (r2 = 0.40, p = .03) and was significantly lower in the angiotensin-converting enzyme inhibitor group compared with the no angiotensin-converting enzyme inhibitor group (p = .03). The proinflammatory markers interleukin-6 and interleukin-8 as well as the anti-inflammatory marker interleukin-10 increased significantly after cardiopulmonary bypass (all p < .001). Interleukin-6 concentrations were significantly higher in the angiotensin-converting enzyme inhibitor group after cardiopulmonary bypass (p = .02) even after controlling for potential confounding factors such as age, cardiopulmonary bypass time, and transfusion volume. Angiotensin-converting enzyme inhibition attenuates the increase in postoperative plasminogen activator inhibitor-1 but enhances the interleukin-6 response in children undergoing cardiopulmonary bypass.

Effect of normothermic cardiopulmonary bypass on renal injury in pediatric cardiac surgery: A randomized controlled trial

Hypothermic cardiopulmonary bypass (CPB), although associated with a reduction in oxygen requirement, has a number of disadvantages including detrimental effects on enzymatic function, energy generation, and cellular integrity. Normothermic perfusion is potentially a more physiologic method to maintain the functional integrity of major organ systems. One of the aims of this trial was to compare the effect of normothermic and hypothermic CPB on renal injury in pediatric patients undergoing cardiac surgery. Fifty-nine children (median age, 78 months; interquartile range, 39-130) undergoing corrective cardiac surgery were randomized to either hypothermic (28°C) or normothermic (35°C-37°C) CPB. Urinary albumin, retinal binding protein (RBP) and N-acetyl-β-glucosaminidase (NAG) were measured preoperatively, end of CPB, 4, and 24 hours postoperatively and were expressed as a ratio of urinary creatinine. Serum creatinine was measured preoperatively, end of CPB, and 24 and 48 hours postoperatively. Results are expressed as a difference in means (normotheric - hypothermic) or as a ratio of geometric means (normothermic/hypothermic). Baseline characteristics were similar in both groups. For these biochemical markers no significant interactions between treatment and postintervention time were found. Serum creatinine (-2.10; 95% confidence interval [CI], -6.51-2.31), RBP (ratio, 0.96; 95% CI, 0.65-1.41), and NAG (ratio, 0.86; 95% CI, 0.56-1.36) were similar in the 2 groups (P ≥ .34), but the urinary albumin was significantly lower in the normothermic group (ratio, 0.63; 95% CI, 0.42-0.95, P = .03). Normothermic CPB is associated with similar renal impairment to hypothermic CPB in children undergoing heart surgery.

The treatment of rhubarb on stress ulcer after cardiopulmonary bypass in children

目的 探讨大黄在体外循环术后并发应激性溃疡中的治疗作用.方法 将我院2004年10月至2010年10月体外循环术后并发应激性溃疡的96例患儿随机分为两组,对照组(46例)使用西咪替丁、思密达、止血剂等,治疗组(50例)在对照组的基础上加用大黄粉,观察并比较两组患儿的治疗效果和治疗时间.结果 治疗组患儿有效48例(48/50),有效率96.0%,明显高于对照组(38/46,82.6%);平均治疗时间(1.94±1.20)d,明显短于对照组[(2.74±1.39)d],两组间比较差异有统计学意义.结论 大黄对体外循环后应激性溃疡有明显治疗作用。

Impact of N-Acetylcysteine on Neonatal Cardiomyocyte Ischemia-Reperfusion Injury

Reactive oxygen species (ROS) are hypothesized to play a key role in myocardial ischemia-reperfusion (IR) injury after cardiopulmonary bypass in children. Clinical studies in adults and several animal models suggest that myocardial IR injury involves cardiomyocyte apoptosis and necrosis. This study investigated a potential relationship between IR-induced ROS production and neonatal cardiomyocyte apoptosis using both in vitro and ex vivo techniques. For in vitro experiments, embryonic rat cardiomyocytes (H9c2 cells) exposed to hypoxia-reoxygenation (HR) showed a time-dependent increase in gp91 phox (a marker for ROS production by NADPH oxidases), caspase-3 (a key mediator of apoptosis) expression, and a decrease in the glutathione redox ratio. N-acetylcysteine (NAC; 0.25-2 mM), a potent antioxidant, decreased gp91 phox and caspase-3 expression, inhibited apoptosis and restored the glutathione redox ratio. For ex vivo study, IR injury significantly reduced left ventricular (LV) function and increased the expression of gp91 phox and caspase-3 in Langendorff-perfused neonatal (7-14 d) rabbit hearts. NAC (0.4 mM) treatment completely attenuated LV dysfunction after IR. In summary, neonatal myocardial IR injury is associated with an increase in cardiomyocyte oxidative stress and apoptosis. NAC attenuates apoptosis in an in vitro embryonic rat cardiomyocyte model of HR, and myocardial dysfunction in an ex vivo neonatal rabbit model of myocardial IR injury.

The incidence of thrombocytopenia after cardiopulmonary bypass in children with Down syndrome

We investigated the incidence of thrombocytopenia in pediatric patients with Down syndrome following cardiac surgery for congenital heart disease. We retrospectively evaluated 162 patients (81 girls, 81 boys; mean age 26.1 ± 39.5 months) who underwent total surgical correction for congenital heart disease. The patients were divided into two groups with respect to the presence (n=118) or absence (n=44, controls) of Down syndrome. Platelet counts were performed preoperatively and on days 1 to 7 after surgery and thrombocytopenia was defined as a platelet count of less than 100,000/mm3. The incidence of thrombocytopenia was significantly higher in patients with Down syndrome compared to controls (61.9% vs. 34.1%, p=0.002). Severe thrombocytopenia was observed in 22% and 4.6% of cases with and without Down syndrome, respectively. Postoperative platelet counts showed sharp decreases in both groups, bottoming out on day 3 and with more significant decreases in patients with Down syndrome; they started to rise on day 4, but remained lower than baseline levels on day 7. The only significant differences between the two groups in preoperative and postoperative variables were higher incidences of reintubation (26.3% vs. 9.1%, p=0.003) and complications during intensive care (50.9% vs. 27.3%, p=0.007) in cases with Down syndrome. Comparison of patients with and without thrombocytopenia independent of Down syndrome yielded significant differences for thrombocytopenic patients with respect to age, operation age, the presence of cyanosis, type of surgery and operation time, aortic clamp and bypass times, lengths of intensive care and hospital stay, intubation and chest tube drainage times, and the incidence of postoperative complications (p<0.05). Despite higher incidence of thrombocytopenia, the presence of Down syndrome was not associated with significant differences other than increased reintubation requirement and higher complication rate during intensive care.

P-15 Correlation between near-infrared spectroscopy and oxygen delivery during cardiopulmonary bypass in children with congenital heart disease

P-15 Correlation between near-infrared spectroscopy and oxygen delivery during cardiopulmonary bypass in children with congenital heart disease

The comparative study of membrane oxygenator DDMO-100S and membrane oxygenator terumo SX-10 used in cardiopulmonary bypass in children

Objective To compare the gas and heat exchange performance of membrane oxygenator DDMO-100S and membrane oxygenator Terumo SX-10 in cardiopulmonary bypass(CPB)in children.Methods 39 children aged 3-12 yrs who suffered from congenital heart disease were selected,and the repair of ventricle septal defect or/and atrial septal defect was performed under cardiopulmonary bypass.The 39 children were randomly divided into Group DD(n =21)and Group SX(n = 18).Membrane oxygenator DDMO-100S(Made by Xi'an Daidai,China)was used in Group DD and Membrane oxygenator Terumo SX-10(Made by Terumo,Japan)in Group SX,respectively.The hypothermic cardiopulmonary bypass with high perfusion flow and the cool crystalloid cardioplegia were applied in all children.The artery blood samples were taken for measuring PO2 and PCO2 and the oxygenating index(OI)was calculated by the formulae(OI = PaO2/FiO2).The temperature at nasal pharynx was monitored and the rewarming time was recorded.Results The total priming volume in Group DD was bigger than in Group SX [(742.5 ± 107.3)ml vs(531.3 ± 84.3)ml,P ＜ 0.05].The PO2,OI and PCO2 at 15 min after CPB or at 5 min before cease of CPB had no differences in both group(P ＞0.05).The rewarming time had no difference in both group [(31.5 ± 10.2)min vs(30.61 ± 8.2)min,P ＞0.05].Conclusions Under our observation condition,the gas and heat exchange performance of membrane oxygenator DDMO-100S were the same as membrane oxygenator Terumo SX-10,when it was used in cardiopulmonary bypass in children,but it had a little bit more priming volume. Key words: Extracorporeal membrane oxygenation/MT; Extracorporeal circulation; Rewarming

Procalcitonin as a marker of bacterial infection in children undergoing cardiac surgery with cardiopulmonary bypass

Owing to systemic inflammatory response syndrome, the diagnosis of post-operative infection after cardiopulmonary bypass is difficult to assess in children with the usual clinical and biological tools. Procalcitonin could be informative in this context. Retrospective study in a paediatric intensive care unit. Blood samples were collected as soon as infection was clinically suspected and a second assay was performed 24 hours later. Using referenced criteria, children were retrospectively classified into two groups: infected and non-infected. Out of the 95 children included, 14 were infected. Before the third post-operative day, procalcitonin median concentration was significantly higher in the infected group than in the non-infected group - 20.24 nanograms per millilitre with a 25th and 75th interquartile of 15.52-35.71 versus 0.72 nanograms per millilitre with a 25th and 75th interquartile of 0.28 to 5.44 (p = 0.008). The area under the receiver operating characteristic curve was 0.89 with 95% confidence intervals from 0.80 to 0.97. The best cut-off value to differentiate infected children from healthy children was 13 nanograms per millilitre with 100% sensitivity - 95% confidence intervals from 51 to 100 - and 85% specificity - 95% confidence intervals from 72 to 91. After the third post-operative day, procalcitonin was not significantly higher in infected children - 2 nanograms per millilitre with a 25th and 75th interquartile of 0.18 to 12.42 versus 0.37 nanograms per millilitre with a 25th and 75th interquartile of 0.24 to 1.32 (p = 0.26). The area under the receiver operating characteristic curve was 0.62 with 95% confidence intervals from 0.47 to 0.77. A procalcitonin value of 0.38 nanograms per millilitre provided a sensitivity of 70% with 95% confidence intervals from 39 to 89 for a specificity of 52% with 95% confidence intervals from 34 to 68. After the third post-operative day, a second assay at a 24-hour interval can improve the sensitivity of the test. Procalcitonin seems to be a discriminating marker of bacterial infection during the post-operative days following cardiopulmonary bypass in children.

Hybrid procedure with cardiopulmonary bypass for muscular ventricular septal defects in children

To summarize the technique and clinical experience of the hybrid procedure with cardiopulmonary bypass in children with muscular ventricular septal defect (mVSD). From January 2006 to June 2010, 45 cases of mVSD underwent hybrid procedures with cardiopulmonary bypass (CPB) under the guidance of transesophageal echocardiography. mVSDs were closed with devices under direct vision in the 45 cases. Fourteen patients had another lesion that required surgical repair. Large membranous VSDs were closed with a pericardial patch after the initiation of CPB in 38 cases. Out of the 45 cases, 42 had only one occluder and three had two occluders. The size of the device for mVSD closure ranged from 3 to 8mm. All cases recovered smoothly after treatment without residual shunting, aortic or mitral valve regurgitation, or restriction of surrounding structures. All the children survived the operation with no late deaths during the follow-up. The hybrid procedure is safe and effective for the closure of congenital heart defects in children.

Endothelial nitric oxide synthase gene polymorphism (Glu298Asp) and acute pulmonary hypertension post cardiopulmonary bypass in children with congenital cardiac diseases

Intra-cardiac repair of congenital cardiac diseases in children with left-right shunt is often associated with acute elevation of pulmonary artery pressure following cardiopulmonary bypass. We studied the correlation between the Glu298Asp polymorphism of the endothelial nitric oxide synthase gene and pulmonary hypertension in children with congenital cardiac diseases. A total of 80 children with congenital cardiac diseases at a median age of 3.8 years, ranged 0.1-36.2 years, and 136 controls were enrolled. Most patients presented with significant left-to-right shunt - pulmonary-to-systemic blood flow of 2.8, with a range from 0.6 to 7.5. In all, 40 out of 80 children showed pulmonary hypertension with mean pressure of 42, ranged 26-82, millimetres of mercury. Thirty-one out of 40 children underwent intra-cardiac repair and 15 out of 31 operated patients were found to have an acute elevation of pulmonary artery pressure after cardiopulmonary bypass. The Glu298Asp polymorphism was identified using polymerase chain reaction and restriction fragment length polymorphism. Both in patients and in controls, the genotype distribution corresponded to the Hardy-Weinberg equilibrium. The gene frequency for Glu298Glu, Glu298Asp and Asp298Asp was not different in the control group compared to the patients (Armitage trend test: p = 0.37). The endothelial nitric oxide synthase polymorphism was related to acute post-operative elevation of pulmonary artery pressure (genotypic frequency 53.3 versus 25%; Armitage trend test: p = 0.038). In addition, the allelic frequency of the Glu298Asp was related to post-operative pulmonary hypertension (Fischer's exact test: p = 0.048). The positive predictive value was 71.43%. Patients with left-to-right shunt are more likely to develop acute elevation of pulmonary artery pressure after cardiopulmonary bypass when presenting with the Glu298Asp polymorphism of the gene endothelial nitric oxide synthase. This could be used as a genetic marker for the predisposition for the development of pulmonary hypertension after intra-cardiac repair.

Correlation of Interleukin-8, Pediatric Logistic Organ Dysfunction score and factors associated with systemic inflammatory response after cardiopulmonary bypass in children who have undergone open-heart surgery

Background Cardiopulmonary bypass (CPB) provides a complex set of non-physiologic circumstances, induces systemic release of pro-inflammatory cytokines and initiates systemic inflammatory response. IL-8 is an important activator of neutrophil with chemotactic effect and are proposed to be major mediator of inflammation. The majority of general intensive care unit scoring system does not adequately address the specific characteristics of cardiac surgery patients. None of the study had been published the validation of PELOD score setting in pediatric cardiac intensive care unit (CICU).Objectives To evaluate the correlation between interleukin-8 (IL-8), Pediatric Logistic Organ Dysfunction (PELOD) score and factors associated with systemic inflammatory response after bypass (SIRAB) in children undergone cardiopulmonary bypass surgery.Methods A quasi-experimental study was conducted on children who have undergone cardiac surgery requiring CPB. There were 21 eligible children, two were excluded. Blood samples from mixed vein and coronary sinus were taken before, during and after surgery. The plasma level of IL-8 analyzed at 3 time points: baseline (before) CPB, at reperfusion period and 3 hours after aortic cross clamp-off. Cumulative organ dysfunctions were analyzed by PELOD score.Results The plasma level of IL-8 highly increase at the reperfusion period. IL-8 plasma level correlated with bypass-time (r &gt; 0.49, p=0.003) and aortic cross clamp-time (r &gt; 0.55, P=.014). Moderate association between age and PELOD score (r &gt; 0.47, P=0.041). The correlations were significant between age and mechanical ventilation time support (r &gt; 0.47, P=0.03), age and length of stay in CICU (r &gt; 0.44, P=0.05). No correlation between IL-8 plasma level and PELOD score.Conclusion There was no correlation between IL-8 plasma level and PELOD score. IL-8 plasma level correlated with aortic cross clamp-time in children who undergo cardiopulmonary bypass surgery.

The relationship with regional cerebral oxygen saturation and blood variety index by central venous oxygen saturation under the cardiopulmonary bypass in children

The relationship with regional cerebral oxygen saturation and blood variety index by central venous oxygen saturation under the cardiopulmonary bypass in children