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Retroperitoneal abscesses are relatively uncommon in infants and children. They carry a high rate of morbidity due to insidious onset and pose a diagnostic challenge. Here we report a case of spontaneous retroperitoneal methicillin-resistant Staphylococcus aureus (MRSA) infection in a two-year-old patient. The patient was successfully treated with antibiotics and surgical washout and drainage. A retroperitoneal abscess is usually found in patients with a history of osteomyelitis, seeding of post-traumatic pelvic hematomas, post radiation, or perforated hollow viscus including but not limited to: perforated appendicitis, bowel perforations due to foreign objects or malignancy, or perforated diverticulitis. Most of these conditions are usually found in the adult population. As per a recent literature search, there are no reported cases of a spontaneous retroperitoneal MRSA abscess in the pediatric population without risk factors.

Introduction In response to the opioid epidemic, we hypothesized that adequate pain control can be achieved with few, if any, opioid prescriptions at discharge following pediatric surgical procedures. Methods All records for patients 0–15 years old who underwent pediatric surgical operations from December 2017 through May 2018 were reviewed. Opioids prescriptions, emergency department (ED) visits, and hospital readmissions were recorded. Postoperative pain was assessed on a scale from 0 to 10 via phone call within three days of discharge. Results 352 patients underwent 394 surgical procedures. Three patients were prescribed opioids at discharge. There were no pain-related readmissions. One patient returned to the ED owing to pain. 116 unique pain scores were obtained from 114 patients: score 0 (n = 69, 59%), 1–3 (n = 31, 27%), 4–5 (n = 11, 9%), 6–8 (n = 5, 4%), and 9–10 (n = 0, 0%). There was a positive association between pain and increasing age (r = 0.26, p = 0.005). No patients who underwent hernia repair reported a pain score greater than 3. Conclusions Adequate pain control at discharge after pediatric general surgical procedures can be achieved for most children with scheduled nonopioid medications only. A limited supply of opioids for analgesia after discharge may benefit small subset of patients. This strategy would help reduce opioid prevalence in the community. Type of study Retrospective cohort study. Level of evidence Level III.

Esophageal atresia (EA) with or without tracheoesophageal fistula (TEF) are relatively common congenital anomalies. Additional variants of these anomalies have been reported, including EA-TEF associated with congenital esophageal stenosis (CES) and a few reports of EA-TEF associated with an esophageal web or membranous diaphragm. We report an extremely rare case of EA with distal TEF associated with both a CES and a separate esophageal web distal to the TEF. EA-TEF with an associated CES and/or mucosal web distal to the TEF presents both a diagnostic and management challenge, as the standard diagnostic/pre-operative work-up may not identify the distal areas of esophageal occlusion. Surgeons should be aware and should maintain a high index of suspicion for these anatomic variants as they can lead to operative complications. Use of a tube to confirm patency of the distal esophageal pouch as a standard technique during EA-TEF repair may help avoid the potential pitfalls associated with failure to recognize these conditions. Keywords: Congenital esophageal stenosis, Esophageal atresia, Esophageal web, Tracheoesophageal fistula

The purpose of this study was to determine the changes in endothelin (ET) receptor subtype expression and their functional significance after endotoxin pretreatment. Rats were pretreated with lipopolysaccharide (LPS) or sterile saline (control). After 24 h, liver samples were homogenized and competitive receptor binding assays were performed. There was no significant difference in ET receptor binding affinity between the control and LPS groups. However, the receptor subtype density showed a significant increase in ET B receptors in LPS-treated rats, whereas the amount of ET A receptors was almost identical between the two groups. In control, almost all ET receptors (95%) were displaced by using combined ET A antagonist (BQ-610) and ET B agonist (IRL-1620) as competitors, whereas only 80% (P < 0.05 versus control) was displaced in LPS group, raising the possibility of novel type of ET receptor expression. An infusion of ET B agonist (Sarafotoxin 6c, S6c) through portal vein in isolated perfused livers produced the same pressure response in both LPS and control groups; however, the portal pressure increase in response to the ET-1, which binds all ET receptors, was significantly potentiated in LPS-treated rats compared to controls. We conclude that altered regulation of ET receptors, in particular, the appearance of ET binding capacity that is not displaced by ET A or ET B competitors, may explain the hyper-response of the portal venous system to ET-1 during endotoxemia.

This study compares the effects of carbon dioxide pneumoperitoneum versus laparotomy on cellular-mediated immune response in a murine model.Sixty-eight female C3H/He mice were sensitized to keyhole limpet hemocyanin (KLH) and to a mouse mammary carcinoma cell line (MC2) before surgery. Animals were randomized into 4 groups: group I, anesthesia (control); group II, pneumoperitoneum with carbon dioxide; group III, extraperitoneal wound; group IV, laparotomy. All animals were challenged subsequently with KLH and MC2 tumor cells. Delayed-type hypersensitivity skin reaction (DTH) to KLH was measured on postoperative days (PODs) 1, 2, 4, and 5. Tumor growth was assessed weekly as an indicator of postoperative cellular immune response.Compared with preoperative values, postoperative DTH skin reactions were significantly less for all PODs in groups III and IV (P.05), on POD 1 and 4 in group II (P.05) and POD 4 for group I (P.05). Group IV showed significantly fewer DTH skin reactions for all PODs compared with groups I and II (P.05) and all PODs except on day 2 compared with group III (P.05). Tumor growth was significantly increased at postoperative week 2 (n = 3/17 mice) and 3 (n = 4/17 mice) in group IV, when compared with groups I and II (P.05).Cellular immunity is preserved after carbon dioxide pneumoperitoneum compared with extraperitoneal incisions and laparotomy as measured by DTH and the ability to reject an immunogenictumor.

The purpose of this study is to delineate the effect of different operative procedures on the cell-mediated immune response in a pediatric animal model using the delayed type hypersensitivity (DTH) skin test.Sprague Dawley rats (1 week old) were sensitized against keyhole limpet hemocyanin (KLH). Animals were challenged 2 weeks later by an intradermal injection of KLH (0.3 mg) in sterile saline. Rats with positive DTH skin reactions at 24 and 48 hours after challenge (baseline) were divided randomly into five groups (n = 10 each): group I, unmanipulated control; group II, anesthesia; group III, anesthesia and midline extraperitoneal incision; Group IV, anesthesia and laparoscopy (pneumoperitoneum with carbon dioxide); Group V, anesthesia and midline laparotomy. Before each procedure (day 0) and on postoperative days 3 and 6, animals were again challenged intradermally with KLH (0.3 mg). DTH skin reaction was evaluated 24 and 48 hours later.A statistically significant difference (P.05) in DTH skin reaction at 24 and 48 hours was observed between postoperative days 1 to 5 in the extraperitoneal and laparotomy groups with respect to baseline and the control group. Statistically significant differences were found in postoperative days 1, 4, and 5 between laparoscopy and laparotomy. The laparoscopy group showed a statistically significant decrease in DTH skin induration on postoperative day 2 when compared with the control group. At postoperative day 7 and 8 there was no statistical difference in DTH skin response comparing baseline values or between groups.These results suggest that in a pediatric animal model, abdominal surgical procedures accompanied by extensive tissue dissection produce a cellular immunosuppression, lasting up to 7 days, which is not observed in less invasive procedures. Observations concerning lesser immunosuppressive effects of laparoscopy when compared with laparotomy in adult models, as previously described by our laboratory, were also found in this pediatric model.

We designed a prospective controlled animal study to compare the stress response induced after laparoscopic and open cholecystectomy.Twelve female pigs (20-25 kg body weight) were anesthetized with ketamine, pentobarbital, and fentanyl. The animals were randomized into the following four groups: control (C), pneumoperitoneum with CO(2) at 14-15 mmHg (P), laparoscopic cholecystectomy (LC), and open cholecystectomy (OC). The average duration of the procedure in each group was 35 min.Central venous pressure, mean arterial pressure, pulmonary capillary wedge pressure, and cardiac output were monitored. Measurements were recorded when animals were anesthetized (baseline), immediately before and after surgery, and thereafter every 30 min for a maximum of 3 h. White blood cell count (WBC) was determined from blood samples taken before and after 3 h of surgery. Ultrasound-guided liver biopsies were done preoperatively and after 3 h of surgery. Total RNA was isolated from the liver biopsy specimens. Steady-state mRNA levels of beta-fibrinogen (beta-fib), alpha 1-chymotrypsin inhibitor (alpha1-CTI), metallothionein (MT), heat shock protein 70 (Hsp70), and polyubiquitin (Ub) were detected by Northern blot/hybridization. There were no statistical differences in the hemodynamic parameters among the groups. The number of circulating neutrophils and monocytes decreased only after LC. Expression of Hsp70 was not induced after any surgical procedure, and the mRNA levels of Ub did not change after surgery. The expression of alpha1-CTI and beta-fib (acute phase genes) were similarly increased after LC and OC. Steady-state mRNA levels of MT were slightly increased after P and LC but not after OC.These data indicate that there are no significant differences between LC and OC in terms of induction of the stress response.

Background. Laparoscopic Nissen fundoplication (LNF) is gaining popularity. Although the hemodynamic effects of the typical pneumoperitoneum have been studied, the additional consequences of the hiatal dissection necessary for LNF have not. Methods. Seven female pigs were anesthetized, intubated, and ventilated with a volume ventilator and hemodynamic and mechanical pressure monitoring devices were placed. Pressures were recorded every 15 minutes for 1 hour after each of four interventions: (1) anesthesia induction, (2) CO2 pneumoperitoneum (15 mm Hg), (3) LNF, and (4) release of pneumoperitoneum (and removal of ports). Results. Right atrial, inferior vena caval, mediastinal, pleural, airway, and pulmonary capillary wedge pressures all increased after pneumoperitoneum (p < 0.05). Only mediastinal pressure (8.6 vs 13.7 mm Hg, pneumoperitoneum vs LNF; p < 0.05) and pleural pressure (2.6 vs 3.5 mm Hg, pneumoperitoneum vs LNF; p < 0.05) showed a further significant increase after LNF. In addition, cardiac output fell significantly after LNF (5.9 vs. 4.6 L/min; p < 0.05). Mediastinal pressure and cardiac output remained significantly altered after the release of pneumoperitoneum. Conclusions. Surgical disruption of the esophageal hiatus during LNF causes both increased mediastinal and pleural pressure and a significant reduction in cardiac output. These findings uncover a previously unsuspected physiologic detriment that may occur during LNF.