Impact of positive end-expiratory pressure with alveolar recruitment maneuver on respiratory and oxygenation parameters of patients during laparoscopic bariatric surgery.

OBJECTIVE: Laparoscopic bariatric surgery is frequently associated with disturbances in respiratory mechanics. An alveolar recruitment maneuver (ARM) with positive end-expiratory pressure (PEEP) is a strategy to overcome such respiratory conditions. This study aimed to evaluate the effect of ARM+PEEP on intraoperative and postoperative respiratory and hemodynamic parameters of patients with laparoscopic bariatric surgery. PATIENTS AND METHODS: Patients who underwent laparoscopic bariatric surgery between 2009 and 2016 were retrospectively evaluated. The study sample was divided into four groups based on PEEP values and the presence of ARM: Group PEEP 5 (5 cm H2O PEEP only), Group PEEP 5/RM (5 cm H2O PEEP plus ARM), Group PEEP 10 (10 cm H2O PEEP only), Group PEEP 10/RM (10 cm H2O PEEP plus ARM). Patients' demographic characteristics, ventilatory, respiratory, and oxygenation parameters were recorded. Oxygenation index (PaO2/FiO2) was the study's primary outcome. RESULTS: There were 156, 158, 299, and 210 patients in Groups PEEP 5, PEEF 5/RM, PEEP 10, and PEEP 10/RM, respectively. Tidal volume, driving tidal volume/compliance, PaO2, PaO2/FiO2, and PaCO2 were significantly lower in Groups PEEP 5 and PEEP 5/RM, whereas SpO2 and FiO2 were significantly higher in Groups PEEP 5 and PEEP 5/RM (p<0.05). Patients in Group PEEP 5 had significantly higher end-tidal carbon dioxide (EtCO2) values than those of other groups (p<0.001). Patients in Group PEEP 5/RM had significantly higher SpO2 values than those in Group PEEP 5 (p<0.001). Rate of postoperative atelectasis was significantly higher in Group PEEP 5/RM compared to the other groups (p=0.011). CONCLUSIONS: A PEEP level of at least 10 cm H2O with ARM improved intraoperative respiratory parameters and caused a significant reduction in postoperative atelectasis.

Pregnancy after renal transplantation.

OBJECTIVE: A well-functioning renal transplant usually reverses ESRD-related infertility and allows the reproductive function to improve. In this study, we wanted to emphasize that women who have renal transplantation can live healthy pregnancies with a careful follow-up. BACKGROUND: 204 patients underwent renal transplantation in our center and 84 of them were female. Five of our patients (one of them had two births) gave birth to a total of 6 pregnancies. METHOD: All of these patients were evaluated according to the criteria by the organ transplant team and perinatologist before the pregnancy planning and during the pregnancy processes. RESULTS: The mean age of the patients was 22.5 ± 4.5 (18-29) years. The creatinine level was below in 1.5 mg/dl in all patients in the pre-pregnancy period, and 1 + proteinuria was found in only two of them. Pregnancy periods varied between 31 weeks and 38 weeks. All births were performed by cesarean section and birth weight in babies ranged between 1650 and 3190 gram. CONCLUSION: Pregnancy in the renal transplant recipient is high-risk and should be managed by a multidisciplinary team of high-risk obstetricians, perinatalogists and transplant nephrologists. It should be closely monitored in terms of complications during pregnancy (Tab. 5, Ref. 16).

The effect of polypropylene mesh on ilioinguinal nerve in open mesh repair of groin hernia.

OBJECTIVES: Repair of groin hernia is one of the most common operations performed by general surgeons, and mesh repair methods have gained wide acceptance. Chronic pain is the most serious long-term complication that can occur after repair of groin hernia. The development of chronic pain after herniorraphy has been attributed to several mechanisms, including damage to sensory nerves and mesh inguinodynia. MATERIAL AND METHODS: Twenty-four rabbits underwent bilateral inguinal dissection and synthetic polypropylene mesh laid on one side. Bilateral inguinal dissection was performed again after 3 months, and samples of nerve tissue were taken from both sides for histological examination. RESULTS: Light microscopic examination of the sections of control group peripheral nerves were in normal appearance, but the nerve fascicles in experimental group operated with mesh showed axonal dilation and mild-to-severe loss of myelinated axons. Examination of semi-thin and ultra-thin sections in control group peripheral nerve fascicles showed normal morphology. Ultrastructural nerve morphology in experimental group operated with mesh exhibited endoneurinal edema with thickening of both endoneurium and perineurium, causing separation of nerve fibers. Myelin sheaths of fibers showed an ondulation toward the axoplasm and the endoneurium. Separation of myelin layers from each other as a prominent feature of myelin degeneration in nerve fibers was also observed. Axoplasms exhibited edema and crystallization. CONCLUSIONS: The light microscopic and ultrastructural changes seen in peripheral nerves in experimental group operated with mesh suggested that mechanical compression of peripheral nerves is associated with myelin degeneration, endoneurinal and perineurial edema, fibrosis, axonal loss, and edema that may cause peripheral neuropathy. Chronic groin pain after hernia repair can be possibly caused by the entrapment of peripheral nerves in the scar tissue formed by the mesh.