Factors influencing blood loss and postoperative morbidity in children undergoing craniosynostosis surgery: a retrospective study.

BACKGROUND: Craniosynostosis is a condition resulting from the premature fusion of cranial sutures. Corrective surgery is often associated with a large amount of blood loss, with transfusion of red blood cells (RBC) and fresh frozen plasma (FFP). The aims of this study were to determine the variables associated with increased blood loss and postoperative complications. METHODS: A retrospective analysis was performed of 42 pediatric patients who underwent craniosynostosis surgery. We analyzed the following: demographic parameters, duration of surgery, intraoperative blood loss, RBC, FFP and fluid transfusion, urine output, and hemodynamic parameters. In addition, we recorded the postoperative length of stay in the intensive care unit and hospital, postoperative blood loss and early complications. RESULTS: The mean age, weight and surgical duration were 9.2 ± 3.2 months, 9.3 ± 2.0 kg and 255.8 ± 46.7 min, respectively. Intraoperative blood loss was 61.2 ± 15.3 ml/kg and RBC, FFP and fluid transfusion were 27.3 ± 7.1 ml/kg, 16.5 ± 4.7 ml/kg and 21.7 ± 4.6 ml/kg/h, respectively. Greater intraoperative blood loss was associated with longer surgical duration (p = 0.001, correlation coefficient = 0.495, R2 = 0.245) and lower patient weight (p < 0.001, correlation coefficient = -0.557, R2 = 0.311). Longer hospital stay was associated with greater intraoperative blood loss (p < 0.001, correlation coefficient = 0.754, R2 = 0.568) and greater intraoperative RBC transfusion (p < 0.001, correlation coefficient = 0.795, R2 = 0.632). CONCLUSION: Severe blood loss occurred in all children who underwent craniosynostotic corrections. Furthermore, the duration of surgery, patient weight and certain surgical procedures correlated with greater blood loss. Careful hemodynamic monitoring and evaluation of a patient's hematocrit value and volume status together may be helpful in maintaining the balance between insufficient and excessive blood product transfusion.

The intrinsic apoptotic pathway is required for lipopolysaccharide-induced lung endothelial cell death.

LPS has been implicated in the pathogenesis of endothelial cell death associated with Gram-negative bacterial sepsis. The binding of LPS to the TLR-4 on the surface of endothelial cells initiates the formation of a death-inducing signaling complex at the cell surface. The subsequent signaling pathways that result in apoptotic cell death remain unclear and may differ among endothelial cells in different organs. We sought to determine whether LPS and cycloheximide-induced cell death in human lung microvascular endothelial cells (HmVECs) was dependent upon activation of the intrinsic apoptotic pathway and the generation of reactive oxygen species. We found that cells overexpressing the anti-apoptotic protein Bcl-X(L) were resistant to LPS and cycloheximide-induced death and that the proapoptotic Bcl-2 protein Bid was cleaved following treatment with LPS. The importance of Bid was confirmed by protection of Bid-deficient (bid(-/-)) mice from LPS-induced lung injury. Neither HmVECs treated with the combined superoxide dismutase/catalase mimetic EUK-134 nor HmVECs depleted of mitochondrial DNA (rho(0) cells) were protected against LPS and cycloheximide-induced death. We conclude that LPS and cycloheximide-induced death in HmVECs requires the intrinsic cell death pathway, but not the generation of reactive oxygen species.

[The effects of immunonutrition on the development of nosocomial infections and on clinical outcome in critically ill patients]. / Yogun bakim hastalarinda uygulanan immünonütrisyonun nozokomiyal enfeksiyon gelisimine ve klinik sonuca etkisi.

BACKGROUND: We investigated the effects of early immunonutrition on the development of nosocomial infections and clinical outcome in intensive care patients. METHODS: Thirty mechanically ventilated patients were randomly assigned to two enteral nutrition regimens in the intensive care unit. Fifteen patients (8 males, 7 females; mean age 54 years; range 21 to 72 years) received immunonutrition solution containing arginine, nucleotides, and polyunsaturated fatty acids, while controls (10 males, 5 females; mean age 55 years; range 24 to 78 years) received isocaloric solution. The patients were evaluated daily using the APACHE II and SOFA (Simplified Organ Failure Assessment) scoring systems. Infections were sought in tracheal, blood, urine, and catheter cultures. Changes in nitrogen balance, leukocyte count, and APACHE II and SOFA scores were compared. RESULTS: Significant changes in nitrogen balance, APACHE II and SOFA scores, and leukocyte count were found in the study group (p<0.001, p<0.0001, p<0.0001, p<0.05, respectively), whereas no significant differences were detected in the control group. Cultures were positive in nine patients in the immunonutrition group, and in 12 patients in the control group. Septic shock and mortality rates were 26% and 20% in the study patients, and 40% and 33% in the controls, respectively (p>0.05). CONCLUSION: Patients receiving immunonutrition exhibit better nutritional status and improved scores showing clinical severity and organ failure.