Type I Interferon Orchestrates Demand-Adapted Monopoiesis during Influenza A Virus Infection via STAT1-Mediated Upregulation of Macrophage Colony-Stimulating Factor Receptor Expression.

Whether and how a local virus infection affects the hematopoietic system in the bone marrow is largely unknown, unlike with systemic infection. In this study, we showed that influenza A virus (IAV) infection leads to demand-adapted monopoiesis in the bone marrow. The beta interferon (IFN-ß) promoter stimulator 1 (IPS-1)-type I IFN-IFN-α receptor 1 (IFNAR1) axis-mediated signaling was found to induce the emergency expansion of the granulocyte-monocyte progenitor (GMP) population and upregulate the expression of the macrophage colony-stimulating factor receptor (M-CSFR) on bipotent GMPs and monocyte progenitors via the signal transducer and activator of transcription 1 (STAT1), leading to a scaled-back proportion of granulocyte progenitors. To further address the influence of demand-adapted monopoiesis on IAV-induced secondary bacterial infection, IAV-infected wild-type (WT) and Stat1-/- mice were challenged with Streptococcus pneumoniae. Compared with WT mice, Stat1-/- mice did not demonstrate demand-adapted monopoiesis, had more infiltrating granulocytes, and were able to effectively eliminate the bacterial infection. IMPORTANCE Our findings show that influenza A virus infection induces type I interferon (IFN)-mediated emergency hematopoiesis to expand the GMP population in the bone marrow. The type I IFN-STAT1 axis was identified as being involved in mediating the viral-infection-driven demand-adapted monopoiesis by upregulating M-CSFR expression in the GMP population. As secondary bacterial infections often manifest during a viral infection and can lead to severe or even fatal clinical complications, we further assessed the impact of the observed monopoiesis on bacterial clearance. Our results suggest that the resulting decrease in the proportion of granulocytes may play a role in diminishing the IAV-infected host's ability to effectively clear secondary bacterial infection. Our findings not only provide a more complete picture of the modulatory functions of type I IFN but also highlight the need for a more comprehensive understanding of potential changes in hematopoiesis during local infections to better inform clinical interventions.

Distinct subsets of synovial fibroblasts control cartilage destruction in joint diseases.

Inflammation-induced bone destruction is the main cause of progressive joint damage in rheumatoid arthritis (RA) and osteoarthritis (OA). In addition, depending on the tissue microenvironment stimulators, the synovium transforms into a hyperplastic invasive tissue. The synovium includes two specific subsets of fibroblasts surrounding the joints: lining and sublining synovial fibroblasts (SFs). These SFs grow and interact with immune cells invading the bone and cartilage; specifically, SFs, which are the major mesenchymal cells in the joints, develop an aggressive phenotype, thereby producing cytokines and proteases involved in arthritis pathogeneses. Transcriptomic differences in the heterogeneity of SFs reflect the joint-specific origins of the SFs interacting with immune cells. To understand the subsets of SFs that lead to joint damage in arthritis, clarifying the distinct phenotypes and properties of SFs and understanding how they influence bone cells, such as osteoclasts and chondrocytes, is crucial. This review provides an overview of the advancements in the understanding of SF subsets and features, which may aid in identifying newer therapeutic targets.

Efficacy and safety of remifentanil for endoscopic ultrasound-guided tissue acquisition: a single center retrospective study.

BACKGROUND: Remifentanil is a rapid onset and rapid recovery opioid. The combination of remifentanil and propofol for deep sedation decreases the incidents of movement, cough, and hiccup. We evaluated the efficacy and safety of remifentanil during endoscopic ultrasound-guided tissue acquisition. METHODS: We retrospectively reviewed patients in whom endoscopic ultrasound-guided tissue acquisition was performed for solid mass lesions of the upper gastrointestinal tract and adjacent organs. All patients were premedicated with midazolam (2 mg), and target-controlled infusion of propofol, opioid, and Bispectral Index (BIS) monitoring were administered as necessary to maintain moderate-to-deep sedation. The opioids used were a bolus of alfentanil or remifentanil infusion. The discharge time, consumption of propofol and opioid, adverse events, diagnostic accuracy, and sensitivity and specificity for malignancy, were compared. RESULTS: Tissue acquisition was achieved in 123 patients (alfentanil group, n = 64; remifentanil group, n = 59). The discharge time of the remifentanil group (16.5 ± 3.2 min) was significantly shorter than that of the alfentanil group (19.0 ± 4.9 min, P = 0.001). The consumption of propofol, adverse events, diagnostic accuracy, sensitivity, and specificity for malignancy in the alfentanil group were not significantly different from those in the remifentanil group. CONCLUSIONS: Use of alfentanil or remifentanil for target-controlled infusion of propofol-BIS monitoring can provide good sedative and diagnostic quality for endoscopic ultrasound-guided tissue acquisition. However, remifentanil resulted in faster recovery than alfentanil.

Target-controlled propofol infusion with or without bispectral index monitoring of sedation during advanced gastrointestinal endoscopy.

BACKGROUND AND AIM: Target-controlled infusion (TCI) uses averaged pharmacokinetic datasets derived from population samples to automatically control the infusion rate. Bispectral index (BIS) technology non-invasively measures levels of consciousness during surgical procedures. We compared the efficacy and safety of propofol TCI with or without BIS monitoring for sedation during advanced gastrointestinal endoscopy. METHODS: This prospective study enrolled 200 patients who were premedicated with midazolam 2 mg and alfentanil 0.4 mg before undergoing advanced gastrointestinal endoscopy. The initial target blood concentration of propofol was set at 1.0 µg/mL, and adjustments of 0.2 µg/mL were made as necessary to maintain moderate-to-deep sedation. Patients were randomized to either the BIS-blind group and evaluated for depth of anesthesia by monitoring scores of 1-2 on the Modified Observer's Assessment of Alertness/Sedation scale (n = 100) or to the BIS-open group and monitored by BIS scores of 60-80 (n = 100). The primary outcome was the total amount of propofol required to maintain anesthesia. Secondary outcomes were sedation-induced adverse events, recovery, and quality of sedation (endoscopist and patient satisfaction). RESULTS: The mean propofol infusion rate was significantly higher in patients not monitored by BIS scores than in those who were (5.44 ± 2.12 vs 4.76 ± 1.84 mg/kg/h; P = 0.016). Levels of satisfaction were higher for endoscopists who used BIS monitoring than in those who did not. CONCLUSIONS: Mean infusion rates were higher in propofol TCI without BIS monitoring compared with propofol TCI with BIS during advanced gastrointestinal endoscopy. Endoscopists expressed satisfaction with BIS monitoring.

Perioperative gastroesophageal regurgitation in patients with elevated abdominal pressure with nasogastric tubes? A simulation model based on esophageal multichannel intraluminal impedance and pH monitoring.

Increased abdominal pressure is common in obese patients and predisposes them to gastroesophageal regurgitation (GER). To drain GER and prevent aspiration, nasogastric (NG) tubes are frequently inserted in obese patients undergoing general anesthesia. However, whether gastric drainage actually decreases the occurrence of GER remains to be elucidated. In this study, increased abdominal pressure was simulated with laparoscopic pneumoperitoneum and Trendelenburg (LPT) positioning, while the retained NG tube was replaced by a pre-inserted esophageal multichannel intraluminal and pH (MII-pH) monitoring. Fifteen patients undergoing elective gynecologic laparoscopy were enrolled in this study. Thirteen patients (86%) developed GER while in the LPT position. With the high occurrence of GER, pre-inserted NG tubes under general anesthesia are not likely to be protective in obese patients.

A survey of one-lung ventilation device in lung resection surgeries in Taiwan-A population-based nationwide cohort study.

BACKGROUND: Double-lumen endotracheal tubes and bronchial blockers are the two lung separation devices most commonly used for lung resection. The preference and outcomes of choosing different lung separation devices have not been discussed in the literature. METHODS: This study was conducted using the data of 2 million patients randomly chosen from the National Health Insurance Research Database between 2011 and 2016. We selected patients who underwent lung resection surgery and surveyed their demographic data and trends of double-lumen endotracheal tube and bronchial blocker use. To determine the influence of endotracheal tubes on clinical outcomes, we computed multiple linear regressions of the number of deaths within 30 days after surgery, intensive care unit stay, hospital stay, and medical cost. RESULTS: The use of bronchial blockers in Taiwan has steadily increased from 6.13% to 11.33% from 2011 to 2016. Anaesthesiologists working in regions with higher thoracic surgery volumes preferred bronchial blockers over double-lumen endotracheal tubes. Bronchial blockers were the preferred choice in women, elderly individuals, patients with more comorbidities, and those undergoing video-assisted thoracoscopic surgeries. After adjustment for sex, age, Charlson Comorbidity Index, and video-assisted thoracoscopic surgeries, we found that patients in whom bronchial blockers were applied had shorter hospital stays. CONCLUSION: The use of bronchial blockers is increasing as the experience of anaesthesiologists increases. Although double-lumen endotracheal tubes remain the principal choice for lung separation in Taiwan, clinical outcomes of the bronchial blocker group were not inferior to those of the double-lumen endotracheal tube group.

Time-Dependent Squamous Cell Carcinoma Antigen in Prediction of Relapse and Death of Patients With Cervical Cancer.

OBJECTIVE: The aim of the study was to develop a methodology to identify the best use of a longitudinally measured biomarker in relevance to prognosis. MATERIALS AND METHODS: Data of squamous cell carcinoma antigen (SCC-Ag) from 770 patients with cervical squamous cell carcinoma (SCC) were used. The pretreatment, nadir, and time-dependent SCC-Ag values were analyzed in relevance to disease relapse and death with univariate and multivariate analysis side by side with a variety of available clinicopathologic factors. The predictive power of the significant variates was evaluated by C-index with 5-fold cross validation. RESULTS: The pretreatment, nadir, and time-dependent SCC-Ag were all significant risk factors for both relapse and death in the univariate analysis (p < .05), and the time-dependent SCC-Ag had the highest C-index in both events. The nadir and time-dependent SCC-Ag were both independently significant in response to relapse with International Federation of Gynecology and Obstetrics (FIGO) stage as the covariate, and the latter had a higher C-index (0.745). Only the time-dependent SCC-Ag was independently significant together with FIGO stage in response to death with the C-index at 0.844. CONCLUSIONS: Increases in the serum level of SCC-Ag in cervical SCC patients suggest a higher risk of both relapse and death. The best use of serial SCC-Ag measurements is to include the time-dependent value in prognostic assessment with FIGO stage also accounted for. Cervical SCC patients should be followed up on their levels of SCC-Ag, and prognostic evaluation should be updated with recent measurements.

Detecting intraoperative gastric regurgitation by using preattached esophageal multichannel intraluminal impedance and pH monitoring on a solid-state manometry: a case series study.

Adequate barrier pressure (BrP), calculated by subtracting intragastric pressure (IGP) from lower esophageal sphincter pressure (LESP), is believed to prevent gastroesophageal regurgitation (GER). However, the occurrence of intraoperative GER, the height and acidity it reached, have rarely been demonstrated simultaneously along with BrP. In this study, we developed preattached multichannel intraluminal impedance monitoring combined with pH-metry (the gold standard for detecting both height and acidity) on a solid-state manometry to continuously detect intraoperative GER as well as BrP changes. We used this system to record LESP, IGP, and changes in impedance through multichannel sensors and pH in patients receiving elective gynecological laparoscopy with laparoscopic pneumoperitoneum and Trendelenburg (LPT) positioning. Changes in BrP were analyzed at three time points (T1: before LPT; T2: during LPT when LESP reached its peak; and T3: after the offset of LPT). Our results indicated that this preattached experimental setup is feasible for intraoperative applications. GER was not detected in our patients throughout LPT. The mean LESP at T2 (23.22 mmHg) was significantly higher than at T1 (13.23 mmHg), but comparable to that at T3 (18.91 mmHg). The mean IGP (3.24 mmHg) at T2 was significantly higher than at T1 and T3 (- 6.10 and - 2.25 mmHg, respectively). The mean BrP scores were comparable from T1 to T3 (T1: 19.34 mmHg; T2: 19.98 mmHg; T3: 21.16 mmHg). Based on our results, the proposed setup is helpful for intraoperative monitoring and management of patients at high risk of GER.

Investigation of microcirculation in patients with venoarterial extracorporeal membrane oxygenation life support.

BACKGROUND: Microcirculatory dysfunction develops in both septic and cardiogenic shock patients, and it is associated with poor prognosis in patients with septic shock. Information on the association between microcirculatory dysfunction and prognosis in cardiogenic shock patients with venoarterial extracorporeal membrane oxygenation (VA-ECMO) support is limited. METHODS: Sublingual microcirculation images were recorded using an incident dark-field video microscope at the following time points: within 12 h (T1), 24 h (T2), 48 h (T3), 72 h (T4), and 96 h (T5) after VA-ECMO placement. If a patient could be weaned off VA-ECMO, sublingual microcirculation images were recorded before and after VA-ECMO removal. Microcirculatory parameters were compared between 28-day nonsurvivors and survivors with VA-ECMO support. In addition, the microcirculation and clinical parameters were assessed as prognostic tests of 28-day mortality, and patients were divided into three subgroups according to microcirculation parameters for survival analysis. RESULTS: Forty-eight patients were enrolled in this study. At T1, the observed heart rate, mean arterial pressure, inotropic score and lactate level of 28-day nonsurvivors and survivors did not differ significantly, but the perfused small vessel density (PSVD) and proportion of perfused vessels (PPV) were lower in the 28-day nonsurvivors than in the survivors. The PSVD and PPV were slightly superior to lactate levels in predicting 28-day mortality (area under curve of 0.68, 0.70, and 0.62, respectively). The subgroup with the lowest PSVD (< 15 mm/mm2) and PPV (< 64%) values exhibited less favorable survival compared with the other two subgroups. CONCLUSIONS: Early microcirculatory parameters could be used to predict the survival of cardiogenic shock patients with VA-ECMO support. TRIAL REGISTRATION: ClinicalTrials.gov, NCT02393274 . Registered on 19 March 2015.

Decreased Parasympathetic Activity of Heart Rate Variability During Anticipation of Night Duty in Anesthesiology Residents.

BACKGROUND: In residency programs, it is well known that autonomic regulation is influenced by night duty due to workload stress and sleep deprivation. A less investigated question is the impact on the autonomic nervous system of residents before or when anticipating a night duty shift. In this study, heart rate variability (HRV) was evaluated as a measure of autonomic nervous system regulation. METHODS: Eight residents in the Department of Anesthesiology were recruited, and 5 minutes of electrocardiography were recorded under 3 different conditions: (1) the morning of a regular work day (baseline); (2) the morning before a night duty shift (anticipating the night duty); and (3) the morning after a night duty shift. HRV parameters in the time and frequency domains were calculated. Repeated measures analysis of variance was performed to compare the HRV parameters among the 3 conditions. RESULTS: There was a significant decrease of parasympathetic-related HRV measurements (high-frequency power and root mean square of the standard deviation of R-R intervals) in the morning before night duty compared with the regular work day. The mean difference of high-frequency power between the 2 groups was 80.2 ms (95% confidence interval, 14.5-146) and that of root mean square of the standard deviation of R-R intervals was 26 milliseconds (95% confidence interval, 7.2-44.8), with P = .016 and .007, respectively. These results suggest that the decrease of parasympathetic activity is associated with stress related to the condition of anticipating the night duty work. On the other hand, the HRV parameters in the morning after duty were not different from the regular workday. CONCLUSIONS: The stress of anticipating the night duty work may affect regulation of the autonomic nervous system, mainly manifested as a decrease in parasympathetic activity. The effect of this change on the health of medical personnel deserves our concern.

Effects of Positive Airway Pressure and Mechanical Ventilation of the Lungs During Cardiopulmonary Bypass on Pulmonary Adverse Events After Cardiac Surgery: A Systematic Review and Meta-Analysis.

OBJECTIVE: To investigate whether different ventilation strategies during cardiopulmonary bypass (CPB) can improve outcomes in adult cardiac surgery patients. DESIGN: Systematic review of randomized controlled trials with meta-analyses. SETTING: Clinical trials for human studies up to July 2016 were obtained from electronic databases (Medline, Embase, PubMed, and the Cochrane Central Register of Controlled Trials) and reference lists of relevant randomized trials and review articles. PARTICIPANTS: Adult patients undergoing cardiac surgery. INTERVENTIONS: Patients who underwent cardiac surgery with CPB and ventilation or continuous positive airway pressure (CPAP). MEASUREMENTS AND MAIN RESULTS: Fifteen randomized controlled trials with 748 patients were analyzed. In cardiac surgery, CPAP use during CPB was associated with an improved alveolar-arterial oxygen gradient difference compared with no CPAP (weighted mean difference [WMD] = 4.11 kPa; 95% confidence interval [CI] = 0.85-7.37; I2 = 28.8%). Ventilation during CPB did not improve the postoperative hypoxemia score (WMD = 30.94; 95% CI = -20.76 to 82.63; I2 = 61%) or diffusion capacity compared with the apnea group (WMD = 2.59 kPa; 95% CI = -2.49 to 7.67; I2 = 81.3%). Neither CPAP nor ventilation during CPB was associated with a shorter mechanical ventilation time or hospital stay. CONCLUSIONS: CPAP during CPB improved the alveolar-arterial oxygen gradient difference compared with apnea, but ventilation during CPB did not. Neither CPAP nor ventilation during CPB demonstrated evidence of improving clinical outcomes in low- or intermediate-risk patients for elective cardiac surgery. The findings are inconclusive because of heterogeneity and small sample sizes.

A Study of Diagnostic Accuracy Using a Chemical Sensor Array and a Machine Learning Technique to Detect Lung Cancer.

Lung cancer is the leading cause of cancer death around the world, and lung cancer screening remains challenging. This study aimed to develop a breath test for the detection of lung cancer using a chemical sensor array and a machine learning technique. We conducted a prospective study to enroll lung cancer cases and non-tumour controls between 2016 and 2018 and analysed alveolar air samples using carbon nanotube sensor arrays. A total of 117 cases and 199 controls were enrolled in the study of which 72 subjects were excluded due to having cancer at another site, benign lung tumours, metastatic lung cancer, carcinoma in situ, minimally invasive adenocarcinoma, received chemotherapy or other diseases. Subjects enrolled in 2016 and 2017 were used for the model derivation and internal validation. The model was externally validated in subjects recruited in 2018. The diagnostic accuracy was assessed using the pathological reports as the reference standard. In the external validation, the areas under the receiver operating characteristic curve (AUCs) were 0.91 (95% CI = 0.79⁻1.00) by linear discriminant analysis and 0.90 (95% CI = 0.80⁻0.99) by the supportive vector machine technique. The combination of the sensor array technique and machine learning can detect lung cancer with high accuracy.

Effects of Polymyxin B Hemoperfusion on Mortality in Patients With Severe Sepsis and Septic Shock: A Systemic Review, Meta-Analysis Update, and Disease Severity Subgroup Meta-Analysis.

OBJECTIVE: Several studies have reported a survival benefit for polymyxin B hemoperfusion treatment in patients with severe sepsis and septic shock. However, recently, a propensity-matched analysis and a randomized controlled trial reported no survival benefit for polymyxin B hemoperfusion treatment. We performed an up-to-date meta-analysis to determine the effect of polymyxin B hemoperfusion treatment on mortality in patients with severe sepsis and septic shock. DATA SOURCES: PubMed, Embase, and Cochrane Library were searched from inception to May 2016. STUDY SELECTION: Studies investigating the effect of polymyxin B hemoperfusion on mortality were considered eligible. We searched for terms related to severe sepsis and septic shock and terms related to polymyxin B hemoperfusion. DATA EXTRACTION: The following data were extracted from the original articles: the name of the first author and publication year, subjects and setting, inclusion and exclusion criteria, mean age and size of the study population, male percentage, mortality, blood pressure, Sequential Organ Failure Assessment score, pulmonary oxygenation, and levels of endotoxin and humoral cytokines. DATA SYNTHESIS: A total of 17 trials were included. The pooled risk ratio for overall mortality was 0.81 (95% CI, 0.70-0.95), favoring polymyxin B hemoperfusion (p = 0.007). Disease severity subgroup meta-analysis revealed a significant reduction of mortality in the intermediate- and high-risk groups (risk ratio, 0.84; 95% CI, 0.77-0.92 and risk ratio, 0.64; 95% CI, 0.52-0.78, respectively), but not in the low-risk group (risk ratio, 1.278; 95% CI, 0.888-1.839). The nonlinear meta-regression with restricted cubic spline showed an almost linear inverse association between the baseline mortality rate and reduction in the risk of mortality. CONCLUSION: The present study demonstrated that polymyxin B hemoperfusion treatment may reduce mortality in patients with severe sepsis and septic shock in specific disease severity subgroups.

Long-term outcomes of totally implantable venous access devices.

PURPOSE: Identifying risk factors for premature totally implantable venous access device (TIVAD) catheter removal is crucial; however, because of the diversity of study methodologies, there is no consensus on such factors. The objective of the present study was to identify such risk factors by applying a cohort design study with a long-term follow-up period. METHODS: For this cohort study, we selected cancer patients who had newly implanted TIVADs between July 2008 and December 2008. The follow-up period lasted until September 2012. Univariate analysis was performed for age, gender, cancer type, TIVAD brand, puncture site, sidedness of puncture, and catheter tip position. The hazard ratio (HR) of potential risk factors was calculated using the Cox proportional hazards regression model, and Kaplan-Meier curves were applied for catheter survival analysis. RESULTS: Our study consisted of 240 people, with 5 people lost to follow-up. The cumulative premature catheter removal rate of all TIVADs was 9.8%, with the most common reason for premature removal being port-associated blood stream infection (PABSI), which proved to be highest in patients with hematology cancer (27.8%) and upper gastrointestinal cancer (19.4%). Suboptimal tip position (HR 5.13, 95% confidence interval 1.73-15.21) was also a risk factor for premature removal, and it was correlated with symptomatic TIVAD occlusion (p = 0.0004). CONCLUSIONS: PABSI was the most common reason for premature catheter removal, with a varied incidence rate between different cancer types. Suboptimal tip position was also a risk factor. Confirming the final tip position after implantation is crucial. Infection control is important for TIVAD care, especially in high-risk cancer patients.

Patients receiving comprehensive periodontal treatment have better clinical outcomes than patients receiving conventional periodontal treatment.

BACKGROUND/PURPOSE: In Taiwan, more than 90% of people aged 35-44 years have periodontal disease. To reduce periodontal disease in Taiwanese people, the National Health Insurance (NHI) system included the comprehensive periodontal treatment project (CPTP) in 2010. The CPTP mainly emphasizes oral hygiene instruction, plaque control, and check-up compliance, with the goal of providing complete, continual, and high-quality periodontal care to patients. The purpose of this study was to assess whether the patients receiving comprehensive periodontal treatment had better clinical outcomes than those receiving conventional periodontal treatment. METHODS: Secondary data exploration was conducted in this study. Based on NHI data, patients who had participated in the CPTP and completed the three-stage periodontal treatments between 2011 and 2012 were recruited in the experimental group (65,342 patients). The patients who had not participated in the CPTP but had received conventional periodontal treatment during the same period were selected in the control group (106,740 patients). Using the four parameters (re-treatment, endodontic therapy, surgical restoration, and tooth extraction) as prognostic indicators, we performed logistic regression analyses to evaluate whether patients in the experimental group had better clinical outcomes than those in the control group. RESULTS: We found that patients participating in the CPTP for 545 days had substantially lower rates of re-treatment, endodontic therapy, surgical restoration, and tooth extraction than those in the control group (p < 0.001). CONCLUSION: We conclude that the patients receiving comprehensive periodontal treatment have better clinical outcomes than the patients receiving conventional periodontal treatment.

Injury Location and Mechanism for Complex Regional Pain Syndrome: A Nationwide Population-Based Case-Control Study in Taiwan.

BACKGROUND: Few studies have investigated the relationship between injury location, mechanism and their association with complex regional pain syndrome (CRPS). We conducted a nationwide database survey to explore this issue. METHODS: This was a population-based case-control study. Five hundred and eighty-nine patients with at least one ambulatory visit or admission with a principal diagnosis of CRPS from 2004 to 2009 were selected. For each CRPS patient, ten age- and sex-matched non-CRPS subjects were randomly selected. The odds ratios (PLoS One. 2013;8:e57205) and 95% confidence intervals (95% CIs) of risk factors for CRPS were derived from multivariate logistic regression models. RESULTS: Injury was a risk factor for CRPS (OR, 2.96; 95% CI, 2.18 to 4.02) independent of age and sex. In adjusted models, open wound on the upper limbs (OR 1.25, 95% CI 1.02 to 1.54) conferred higher CRPS risk. Injury mechanisms including nerve and spinal cord injury (OR 2.42, 95% CI 1.44 to 4.08), muscle and joint sprain and strain (OR 1.69, 95% CI 1.40 to 2.03), superficial injury (OR 1.23, 95% CI 1.00 to 1.51), and contusion (OR 1.44, 95% CI 1.20 to 1.74), but not fracture, increased the risk of CRPS. CONCLUSION: Injury in the extremities rather than the trunk is an important risk factor for CRPS. Certain injury mechanisms confer higher risk of CRPS. This nationwide study demonstrated that injury increased CRPS nearly threefold. Open wound, sprain and strain, superficial injury, contusion, and nerve and spinal cord injury are main injury mechanisms. Injury in the extremities confers a higher risk of CRPS.

Risk stratification and outcome of cardiac surgery for patients with body weight <2 ,500g in an Asian center.

BACKGROUND: Cardiac surgery performed in patients with low body weight is a challenge for surgeons. Currently, such outcomes are mainly reported from European or North American centers. In this study, we review our cardiac surgery experience with neonates and infants weighing <2,500g. METHODS AND RESULTS: We included patients with a body weight <2,500g who received cardiac surgery between January 2008 and December 2012. The survival outcome was compared to that of patients with large body weight, and then the Risk Adjusted Classification for Congenital Heart Surgery (RACHS-1) categorization was used for operative risk stratification. In the 1,245 index operations, 53 patients (4.3%) were <2,500g. The mean body weight was 2,232g (range 1,320-2,500g). The hospital mortality rate was 20.7% (11/53). Most (85%) of the procedures were in RACHS-1 category ≥3. The risk ratio was significantly higher in RACHS-1 category 3 (relative risk [RR]:6.2; 95% confidence interval [CI]:1.6-23.9) and 4 (RR:4.6; 95% CI:1.4-15.0), respectively, while it was not significantly different in category 2 (RR:1.02; 95% CI:1.01-1.02) and category 6 (RR:2.9; 95% CI:0.36-13.3). CONCLUSIONS: Cardiac surgery performed on infants with low body weight is generally a complex procedure, but the results are acceptable. The risk was higher than that for patients with higher body weight in RACHS-1 category 3 and 4. Further investigation to improve the outcome of this high-risk group is needed.

Relationship of abdominal circumference and trunk length with spinal anesthesia level in the term parturient.

BACKGROUND: We hypothesized that body shape metrics influence the anatomy of spinal canal and intraabdominal pressure in three dimensions. We explored the effects of abdominal circumference, trunk length, and their combination on the level of spinal anesthesia in the term parturient in this study. METHODS: Thirty term parturients, ASA class I-II, from 20 to 41 years of age, scheduled for cesarean section were enrolled in this observational study. Abdominal circumference (AC) and trunk length (TL) were recorded preoperatively. Spinal anesthesia was performed with 10 mg 0.5% hyperbaric bupivacaine at the L4-L5 intervertebral space in all parturients. Correlation between maximal sensory spinal anesthesia level and physical parameters was analyzed with Spearman rank correlation coefficients. The calculated r value was compared with r = 0 with p < 0.05 as the significant level. The prediction power of these physical parameters for spinal level was evaluated by prediction probability. RESULTS: The parameter TL/AC2 was statistically correlated with maximal sensory level (Spearman correlation coefficient, -0.45 with p < 0.02). The prediction probability of TL/AC2 for the dermatomal level was P K = 0.685. If the dermatomal levels were lumped as higher (above T2) and lower (below T3) levels, the prediction probability of TL/AC2 was as high as P K = 0.856. CONCLUSIONS: TL/AC2, which simulated the ratio of the long axis and transection area of the abdomen, was correlated with maximal spinal level, and parturients with low TL/AC2 values tended to have higher dermatomal levels during spinal anesthesia.

Surgery for fibrosing mediastinitis with severe pulmonary hypertension due to pulmonary venous stenosis.

A 21-year-old woman with severe pulmonary hypertension and circulatory collapse was referred to our hospital for possible lung transplantation with extracorporeal membrane oxygenation support. Computed tomography revealed severe stenosis of all 4 pulmonary veins, and fibrosing mediastinitis was suspected. Surgical reconstruction of the pulmonary veins was performed, and extracorporeal membrane oxygenation support was weaned off. After surgery, pulmonary vascular resistance normalized. This successful case demonstrates that surgical pulmonary venous reconstruction is an important treatment for fibrosing mediastinitis induced by pulmonary venous stenosis and pulmonary hypertension.

Hypothermia is an independent risk factor for prolonged ICU stay in coronary artery bypass surgery: an observational study.

Maintenance of normothermia is a critical perioperative issue. The warming process after hypothermia tends to increase oxygen demand, which may lead to myocardial ischemia. This study explored whether hypothermia was an independent risk factor for increased morbidity and mortality in patients receiving CABG. We conducted a retrospective observational study of CABG surgeries performed from January 2018 to June 2019. The outcomes of interest were mortality, surgical site infection rate, ventilator dependent time, intensive care unit (ICU) stay, and hospitalization duration. Data from 206 patients were analysed. Hypothermic patients were taller (p = 0.012), had lower left ventricular ejection fraction (p = 0.016), and had off-pump CABG more frequently (p = 0.04). Our analysis noted no incidence of mortality within 30 days. Hypothermia was not associated with higher surgical site infection rate or longer intubation time. After adjusting for sex, age, cardiopulmonary bypass duration, left ventricular ejection fraction, and EuroSCORE II, higher EuroSCORE II (p < 0.001; odds ratio 1.2) and hypothermia upon ICU admission (p = 0.04; odds ratio 3.8) were independent risk factors for prolonged ICU stay. In addition to EuroSCORE II, hypothermia upon ICU admission was an independent risk factor for prolonged ICU stay in patients receiving elective CABG.