Objective: Bronchopulmonary dysplasia (BPD) is a significant respiratory disorder in premature infants, and its prevalence remains high at 35% to 40% of very low gestational age (<28 weeks gestation). The aim of this study is to analyze the respiratory outcomes of BPD in neonatal intensive care unit as well as respiratory outcomes over a corrected age of 18 to 24 months using 3 different definitions of BPD (National Institutes of Health [NIH] 2001, National Institute of Child Health and Human Development [NICHD] 2018 and Jensen 2019). Methods: We conducted a study on infants under 32 weeks of gestation between 2012 and 2021 at Ajou university hospital. First, we compared the incidence of BPD, mortality, and length of hospital stays. To evaluate long-term respiratory outcomes, the number of re-admissions and prescriptions due to respiratory problems were analyzed. Results: NIH 2001 showed an incidence of 281 (40.0%), NICHD 2018 showed 139 (19.7%), and Jensen 2019 showed 137 (19.5%). In grade III of Jensen 2019, it demonstrated the highest severity with mortality rate of 29.4% and an average length of hospital stay of 42.5 weeks. Also, it was confirmed that the period of use of invasive ventilator was the longest at 87.8±60.3 days. In the analysis of readmission and prescription counts, grade III showed statistically significant higher occurrences in both NICHD 2018 and Jensen 2019 than NIH 2001. Conclusion The latest definitions of BPD have demonstrated to better represent both short-term and long-term respiratory severity in premature infants less than 32 weeks.

Objective: Bronchopulmonary dysplasia (BPD) is a significant respiratory disorder in premature infants, and its prevalence remains high at 35% to 40% of very low gestational age (<28 weeks gestation). The aim of this study is to analyze the respiratory outcomes of BPD in neonatal intensive care unit as well as respiratory outcomes over a corrected age of 18 to 24 months using 3 different definitions of BPD (National Institutes of Health [NIH] 2001, National Institute of Child Health and Human Development [NICHD] 2018 and Jensen 2019). Methods: We conducted a study on infants under 32 weeks of gestation between 2012 and 2021 at Ajou university hospital. First, we compared the incidence of BPD, mortality, and length of hospital stays. To evaluate long-term respiratory outcomes, the number of re-admissions and prescriptions due to respiratory problems were analyzed. Results: NIH 2001 showed an incidence of 281 (40.0%), NICHD 2018 showed 139 (19.7%), and Jensen 2019 showed 137 (19.5%). In grade III of Jensen 2019, it demonstrated the highest severity with mortality rate of 29.4% and an average length of hospital stay of 42.5 weeks. Also, it was confirmed that the period of use of invasive ventilator was the longest at 87.8±60.3 days. In the analysis of readmission and prescription counts, grade III showed statistically significant higher occurrences in both NICHD 2018 and Jensen 2019 than NIH 2001. Conclusion The latest definitions of BPD have demonstrated to better represent both short-term and long-term respiratory severity in premature infants less than 32 weeks.

Objective: Bronchopulmonary dysplasia (BPD) is a significant respiratory disorder in premature infants, and its prevalence remains high at 35% to 40% of very low gestational age (<28 weeks gestation). The aim of this study is to analyze the respiratory outcomes of BPD in neonatal intensive care unit as well as respiratory outcomes over a corrected age of 18 to 24 months using 3 different definitions of BPD (National Institutes of Health [NIH] 2001, National Institute of Child Health and Human Development [NICHD] 2018 and Jensen 2019). Methods: We conducted a study on infants under 32 weeks of gestation between 2012 and 2021 at Ajou university hospital. First, we compared the incidence of BPD, mortality, and length of hospital stays. To evaluate long-term respiratory outcomes, the number of re-admissions and prescriptions due to respiratory problems were analyzed. Results: NIH 2001 showed an incidence of 281 (40.0%), NICHD 2018 showed 139 (19.7%), and Jensen 2019 showed 137 (19.5%). In grade III of Jensen 2019, it demonstrated the highest severity with mortality rate of 29.4% and an average length of hospital stay of 42.5 weeks. Also, it was confirmed that the period of use of invasive ventilator was the longest at 87.8±60.3 days. In the analysis of readmission and prescription counts, grade III showed statistically significant higher occurrences in both NICHD 2018 and Jensen 2019 than NIH 2001. Conclusion The latest definitions of BPD have demonstrated to better represent both short-term and long-term respiratory severity in premature infants less than 32 weeks.

Objective: Bronchopulmonary dysplasia (BPD) is a significant respiratory disorder in premature infants, and its prevalence remains high at 35% to 40% of very low gestational age (<28 weeks gestation). The aim of this study is to analyze the respiratory outcomes of BPD in neonatal intensive care unit as well as respiratory outcomes over a corrected age of 18 to 24 months using 3 different definitions of BPD (National Institutes of Health [NIH] 2001, National Institute of Child Health and Human Development [NICHD] 2018 and Jensen 2019). Methods: We conducted a study on infants under 32 weeks of gestation between 2012 and 2021 at Ajou university hospital. First, we compared the incidence of BPD, mortality, and length of hospital stays. To evaluate long-term respiratory outcomes, the number of re-admissions and prescriptions due to respiratory problems were analyzed. Results: NIH 2001 showed an incidence of 281 (40.0%), NICHD 2018 showed 139 (19.7%), and Jensen 2019 showed 137 (19.5%). In grade III of Jensen 2019, it demonstrated the highest severity with mortality rate of 29.4% and an average length of hospital stay of 42.5 weeks. Also, it was confirmed that the period of use of invasive ventilator was the longest at 87.8±60.3 days. In the analysis of readmission and prescription counts, grade III showed statistically significant higher occurrences in both NICHD 2018 and Jensen 2019 than NIH 2001. Conclusion The latest definitions of BPD have demonstrated to better represent both short-term and long-term respiratory severity in premature infants less than 32 weeks.

Objective: Bronchopulmonary dysplasia (BPD) is a significant respiratory disorder in premature infants, and its prevalence remains high at 35% to 40% of very low gestational age (<28 weeks gestation). The aim of this study is to analyze the respiratory outcomes of BPD in neonatal intensive care unit as well as respiratory outcomes over a corrected age of 18 to 24 months using 3 different definitions of BPD (National Institutes of Health [NIH] 2001, National Institute of Child Health and Human Development [NICHD] 2018 and Jensen 2019). Methods: We conducted a study on infants under 32 weeks of gestation between 2012 and 2021 at Ajou university hospital. First, we compared the incidence of BPD, mortality, and length of hospital stays. To evaluate long-term respiratory outcomes, the number of re-admissions and prescriptions due to respiratory problems were analyzed. Results: NIH 2001 showed an incidence of 281 (40.0%), NICHD 2018 showed 139 (19.7%), and Jensen 2019 showed 137 (19.5%). In grade III of Jensen 2019, it demonstrated the highest severity with mortality rate of 29.4% and an average length of hospital stay of 42.5 weeks. Also, it was confirmed that the period of use of invasive ventilator was the longest at 87.8±60.3 days. In the analysis of readmission and prescription counts, grade III showed statistically significant higher occurrences in both NICHD 2018 and Jensen 2019 than NIH 2001. Conclusion The latest definitions of BPD have demonstrated to better represent both short-term and long-term respiratory severity in premature infants less than 32 weeks.

The introduction of endoscopic spine surgery has led to a paradigm shift in the treatment of spinal disorders. In particular, biportal endoscopic surgery has gained traction for its wider visual field and improved the maneuverability of instruments, familiar anatomy, and costeffectiveness. In this study, we describe our en bloc removal of the ligamentum flavum using a “butterfly” technique. This approach had several advantages: (1) The flavum serves as a protective barrier for the dura during drilling. (2) There is less epidural bleeding, which provides (3) better visualization. (4) In an inadvertent durotomy, this usually occurs later in the procedure, which is more manageable than the early stages of decompression. Biportal decompression for spinal stenosis can be performed using an en bloc ligamentum flavum removal technique that is safe, reproducible, and efficient. A systematic approach will help early adopters overcome the steep learning curve.

Background: Remimazolam is a novel benzodiazepine with fast onset and short half-life. We compared the effects of remimazolam and propofol on recovery profiles for general anesthesia in patients undergoing laparoscopic cholecystectomy. Methods: We randomly assigned 108 patients to either a remimazolam (n=54) or propofol (n=54) group. Remimazolam and propofol were used for induction and maintanance of anesthesia. Following anesthesia, we recorded the time until an Aldrete score of 9 was achieved as the primary surrogate marker of complete recovery. The time to reach a Modified Observer’s Assessment of Alertness/Sedation (MOAA/S) score of 2 and the time from the end of anesthesia to eye opening time, recovery time of orientation, time to spontaneous breathing, extubation time, and the time required for analgesics were measured. Heart rate, blood pressure, and bispectral index were assessed before, during, and after pneumoperitoneum. Results: We included 101 patients in the analysis. In the remimazolam group, it took longer to reach an Aldrete score of 9 after the drug infusion ended (P = 0.031). There was no difference in the time to reach MOAA/S 2 between the two groups. The time to eye opening, recovery time of orientation, and time required for analgesics were longer and heart rate was higher in the remimazolam group. Neither blood pressure, nor extubation time differed between groups. Conclusions Remimazolam and propofol provided safe induction and maintenance of anesthesia in patients undergoing laparoscopic cholecystectomy. The recovery time from anesthesia was longer than that with propofol. Fewer hemodynamic changes were observed with remimazolam, but further studies are needed.

Microvilli are outer membrane organelles that contain cross-linked filamentous actin.Unlike well-characterized epithelial microvilli, T-cell microvilli are dynamic similar to those of filopodia, which grow and shrink intermittently via the alternate actin-assembly and -disassembly. T-cell microvilli are specialized for sensing Ags on the surface of Ag-presenting cells (APCs). Thus, these finger-shaped microprotrusions contain many signaling-related proteins and can serve as a signaling platforms that induce intracellular signals. However, they are not limited to sensing external information but can provide sites for parts of the cell-body to tear away from the cell. Cells are known to produce many types of extracellular vesicles (EVs), such as exosomes, microvesicles, and membrane particles. T cells also produce EVs, but little is known about under what conditions T cells generate EVs and which types of EVs are released. We discovered that T cells produce few exosomes but release large amounsts of microvilli-derived particles during physical interaction with APCs. Although much is unanswered as to why T cells use the same organelles to sense Ags or to produce EVs, these events can significantly affect T cell fate, including clonal expansion and death. Since TCRs are localized at microvilli tips, this membrane event also raises a new question regarding long-standing paradigm in T cell biology; i.e., surface TCR downmodulation following T cell activation. Since T-cell microvilli particles carry T-cell message to their cognate partner, these particles are termed T-cell immunological synaptosomes (TISs). We discuss the potential physiological role of TISs and their application to immunotherapies.

Periventricular nodular heterotopia (PNH) is a neuronal migration disorder that occurs during early brain development. Patients with PNH may be asymptomatic and have normal intelligence; however, PNH is also known to cause various symptoms such as seizures, dyslexia, and cardiovascular anomalies. PNH is not commonly diagnosed during early infancy because of the lack of clinical manifestations during this period. We present the case of a female infant diagnosed with PNH based on brain magnetic resonance imaging, who had symptomatic patent ductus arteriosus that had to be ligated surgically and had prolonged feeding cyanosis with frequent apneic spells.

Background: Only a few studies have evaluated the differences between varying concentrations of a fixed dose of local anesthetics. This study was conducted to compare the effects of two different concentrations of a fixed dose of ropivacaine used in ultrasound-guided interscalene brachial plexus block. Methods: This prospective, randomized, double-blind study included 62 patients who underwent arthroscopic surgery under general anesthesia. The patients were randomly assigned to receive ultrasound-guided interscalene block with 75 mg of ropivacaine at one of two concentrations: 0.75% (10 ml; group C) or 0.375% (20 ml; group V). Time to onset of sensory blockade, degree of blockade, pulmonary function changes, analgesic duration of the interscalene block, postoperative opioid requirement within 24 h, postoperative pain scores, satisfaction, and incidence of complications were recorded. Results: Although the time to onset of sensory blockade was shorter for group C (P = 0.015), successful blockade was achieved at 30 min after the interscalene block in both groups. The analgesic duration of the interscalene block was not significantly different between the groups. The amount of opioid used within 24 h after surgery was significantly reduced for group V compared with group C (P = 0.016). The rest of the parameters did not show any significant differences between the two groups. Conclusion Compared with 10 ml of 0.75% ropivacaine, interscalene block with 20 ml of 0.375% ropivacaine could be effective for the reduction of postoperative opioid requirement within 24 h after surgery despite it might not prolong the analgesic duration.