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Journal of the American Heart... May 2024This study aims to investigate the temporal and spatial patterns of structural brain injury related to deep medullary veins (DMVs) damage.
BACKGROUND
This study aims to investigate the temporal and spatial patterns of structural brain injury related to deep medullary veins (DMVs) damage.
METHODS AND RESULTS
This is a longitudinal analysis of the population-based Shunyi cohort study. Baseline DMVs numbers were identified on susceptibility-weighted imaging. We assessed vertex-wise cortex maps and diffusion maps at both baseline and follow-up using FSL software and the longitudinal FreeSurfer analysis suite. We performed statistical analysis of global measurements and voxel/vertex-wise analysis to explore the relationship between DMVs number and brain structural measurements. A total of 977 participants were included in the baseline, of whom 544 completed the follow-up magnetic resonance imaging (age 54.97±7.83 years, 32% men, mean interval 5.56±0.47 years). A lower number of DMVs was associated with a faster disruption of white matter microstructural integrity, presented by increased mean diffusivity and radial diffusion (β=0.0001 and SE=0.0001 for both, =0.04 and 0.03, respectively), in extensive deep white matter (threshold-free cluster enhancement <0.05, adjusted for age and sex). Of particular interest, we found a bidirectional trend association between DMVs number and change in brain volumes. Specifically, participants with mild DMVs disruption showed greater cortical enlargement, whereas those with severe disruption exhibited more significant brain atrophy, primarily involving clusters in the frontal and parietal lobes (multiple comparison corrected <0.05, adjusted for age, sex, and total intracranial volume).
CONCLUSIONS
Our findings posed the dynamic pattern of brain parenchymal lesions related to DMVs injury, shedding light on the interactions and chronological roles of various pathological mechanisms.
Topics: Humans; Male; Female; Middle Aged; Cerebral Veins; Longitudinal Studies; China; White Matter; Adult; Aged
PubMed: 38761086
DOI: 10.1161/JAHA.123.034145 -
PloS One 2024Severe acute lung failure (ALF) often necessitates veno-venous extracorporeal membrane oxygenation (VV-ECMO), where identifying predictors of weaning success and...
Predictors associated with successful weaning of veno-venous extracorporeal membrane oxygenation and mortality in adult patients with severe acute lung failure: Protocol of a pooled data analysis of cohort studies.
BACKGROUND
Severe acute lung failure (ALF) often necessitates veno-venous extracorporeal membrane oxygenation (VV-ECMO), where identifying predictors of weaning success and mortality remains crucial yet challenging. The study aims to identify predictors of weaning success and mortality in adults undergoing VV-ECMO for severe ALF, a gap in current clinical knowledge.
METHODS AND ANALYSIS
PubMed, EMBASE, and the Cochrane Central Register of Controlled Trials will be searched for cohort studies examining the predictive factors of successful weaning and mortality in adult patients on VV-ECMO due to severe ALF. Risk of bias assessment will be conducted using the Newcastle-Ottawa scale for each included study. The primary outcomes will be successful weaning from VV-ECMO and all-cause mortality. Between-study heterogeneity will be evaluated using the I2 statistic. Sensitivity, subgroup, and meta-regression analyses will be performed to ascertain potential sources of heterogeneity and assess the robustness of our results. We will use the Grading of Recommendations, Assessment, Development, and Evaluations (GRADE) tool to recommend the level of evidence.
DISCUSSION
This study seeks to provide clinically significant insights into predictors for weaning and mortality during VV-ECMO treatment for ALF, aiming to support clinical decisions and potentially influence health policy, thereby improving patient outcomes.
ETHICS AND DISSEMINATION
Given the absence of direct engagement with human subjects or access to personal medical records, ethical approval for this study is deemed unnecessary. The study findings will be shared at a scientific conference either at the global or national level. Alternatively, the results will be presented for publication in a rigorously peer-reviewed journal regarding critical care medicine.
Topics: Humans; Extracorporeal Membrane Oxygenation; Adult; Acute Lung Injury; Cohort Studies
PubMed: 38758742
DOI: 10.1371/journal.pone.0303282 -
Circulation. Arrhythmia and... May 2024Unlike conventional microsecond pulsed electrical fields that primarily target the cell membranes, nanosecond pulses are thought to primarily electroporate intracellular...
BACKGROUND
Unlike conventional microsecond pulsed electrical fields that primarily target the cell membranes, nanosecond pulses are thought to primarily electroporate intracellular organelles. We conducted a comprehensive preclinical assessment of catheter-based endocardial nanosecond pulsed field ablation in swine.
METHODS
A novel endocardial nanosecond pulsed field ablation system was evaluated in a total of 25 swine. Using either a low-dose (5-second duration) or high-dose (15-second duration) strategy, thoracic veins and discrete atrial and ventricular sites were ablated. Swine survived for <1 (n=1), ≈2 (n=7), ≈7 (n=6), 14 (n=2), or ≈28 (n=9) days, and venous isolation was assessed before euthanize. Safety assessments included evaluation of esophageal effects, phrenic nerve function, and changes in venous caliber. All tissues were subject to careful gross pathological and histopathologic examination.
RESULTS
All (100%) veins (13 low-dose, 34 high-dose) were acutely isolated, and all reassessed veins (6 low-dose, 15 high-dose) were durably isolated. All examined vein lesions (10 low-dose, 22 high-dose) were transmural. Vein diameters (n=15) were not significantly changed. Of the animals assessed for phrenic palsy (n=9), 3 (33%) demonstrated only transient palsy. There were no differences between dosing strategies. Thirteen mitral isthmus lesions were analyzed, and all 13 (100%) were transmural (depth, 6.4±0.4 mm). Ventricular lesions were 14.7±4.5 mm wide and 7.1±1.3 mm deep, with high-dose lesions deeper than low-dose (7.9±1.2 versus 6.2±0.8 mm; =0.007). The esophagus revealed nontransmural adventitial surface lesions in 5 of 5 (100%) animals euthanized early (2 days) post-ablation. In the 10 animals euthanized later (14-28 days), all animals demonstrated significant esophageal healing-8 with complete resolution, and 2 with only trace fibrosis.
CONCLUSIONS
A novel, endocardial nanosecond pulsed field ablation system provides acute and durable venous isolation and linear lesions. Transient phrenic injury and nontransmural esophageal lesions can occur with worst-case assessments suggesting limits to pulsed field ablation tissue selectivity and the need for dedicated assessments during clinical studies.
PubMed: 38758741
DOI: 10.1161/CIRCEP.124.012854 -
Zhong Nan Da Xue Xue Bao. Yi Xue Ban =... Feb 2024The mouse kidney transplantation model presents challenges in terms of surgical difficulty and low success rate, making it difficult to master. This study aims to...
OBJECTIVES
The mouse kidney transplantation model presents challenges in terms of surgical difficulty and low success rate, making it difficult to master. This study aims to provide a crucial model for transplantation immunology research by modifying and developing novel techniques for mouse kidney transplantation.
METHODS
A total of 57 pairs of mice were used to establish and compare the modified and innovative surgical techniques for mouse kidney transplantation. Three different surgical models were established, including the abdominal suture technique for orthotopic kidney transplantation, the abdominal cuff technique for orthotopic kidney transplantation, and the cervical cuff technique for ectopic kidney transplantation. BALB/c or C57BL/6 male mice, aged 8 to 12 weeks and weighed 20 to 25 g with specified pathogen free-grade were served as the donor mice or the recipient mice. The surgical technique characteristics, key surgical times, complications, and pathological examination in the early postoperative period were summarized and compared.
RESULTS
Three different surgical models of mouse kidney transplantation were successfully established. The comparison of warm ischemic time for the 3 groups of mice showed no statistical significance (=0.510 4). The abdominal suture group had the shortest total operation time of the donor compared with the abdominal cuff group and the cervical cuff group [(18.3±3.6) min vs (26.2±4.7) min and (22.8±2.5) min; both <0.000 1]. There was a significant difference in cold ischemia time among the 3 groups (all <0.000 1), with (60.8±4.1) min in the cervical cuff group, (43.3±5.0) min in the abdominal suture group, and (88.8±6.7) min in the abdominal cuff group. Due to different anastomosis methods, the cervical cuff group had the shortest time [(17.6±2.7) min], whereas the abdominal cuff group had the longest time [(38.8±5.4) min]. The total operation time for the recipients showed significant differences (<0.000 1), with the abdominal suture group having the shortest time [(44.0±6.9) min], followed by the cervical cuff group [(64.1±5.2) min], and the abdominal cuff group [(80.0±6.0) min] being the longest. In the 32 mice of the abdominal suture group, there were 6 with intraoperative bleeding, including 1 arterial intimal injury bleeding and 5 with bleeding after vessel opening. Six mice had ureteral complications, including ureteral bladder anastomotic stenosis, necrosis, and renal pelvis dilation. Two mice had postoperative abdominal infections. In the abdominal cuff group, there was no intraoperative bleeding, but 6 mice showed mild arterial stenosis and 5 showed venous stenosis, 4 arterial injury, 4 arterial thrombosis, and 2 ureteral complications. No postoperative infections occurred in the mice. In the cervical cuff group, no intraoperative bleeding, arterial intimal injury, arterial/venous stenosis, or thrombosis were found in 13 mice. Five mice had ureteral complications, including ureteral necrosis and infection, which were the main complications in the cervical cuff group. The renal function in mice of the 3 groups remained stable 7 days after surgery. Hematoxylin and eosin staining and periodic acid-Schiff staining showed no significant differences in terms of acute rejection among the 3 surgical methods (all >0.05).
CONCLUSIONS
All 3 surgical methods are able to successfully establish mouse kidney transplantation models, with no significant differences observed in the short-term graft survival and acute rejection. The modified abdominal suture technique and abdominal cuff technique have their respective advantages in research applications. The novel cervical cuff technique for ectopic kidney transplantation model is relatively simple to be prepared and causes less trauma to the mice, providing more options for studies involving xenotransplantation, secondary transplantation, and local lymphatic drainage. However, the difficulty in harvesting the donor kidney and the high incidence of ureteral infections need further validation in long-term survival. This study holds important reference value for choosing the type of mouse kidney transplantation model for different research needs.
Topics: Animals; Mice; Kidney Transplantation; Male; Mice, Inbred C57BL; Mice, Inbred BALB C; Models, Animal
PubMed: 38755718
DOI: 10.11817/j.issn.1672-7347.2024.230599 -
The Journal of International Medical... May 2024Traumatic splenic rupture is rare in pregnant women; and multiple venous thromboses of the portal vein system, inferior vena cava and ovarian vein after caesarean...
Traumatic splenic rupture is rare in pregnant women; and multiple venous thromboses of the portal vein system, inferior vena cava and ovarian vein after caesarean section and splenectomy for splenic rupture has not been previously reported. This case report describes a case of multiple venous thromboses after caesarean section and splenectomy for traumatic splenic rupture in late pregnancy. A 34-year-old G3P1 female presented with abdominal trauma at 33 weeks of gestation. After diagnosis of splenic rupture, she underwent an emergency caesarean section and splenectomy. Multiple venous thromboses developed during the recovery period. The patient eventually recovered after anticoagulation therapy with low-molecular-weight heparin and warfarin. These findings suggest that in patients that have had a caesarean section and a splenectomy, which together might further increase the risk of venous thrombosis, any abdominal pain should be thoroughly investigated and thrombosis should be ruled out, including the possibility of multiple venous thromboses. Anticoagulant therapy could be extended after the surgery.
Topics: Humans; Female; Splenectomy; Venous Thrombosis; Adult; Splenic Rupture; Pregnancy; Cesarean Section; Postpartum Period; Anticoagulants; Heparin, Low-Molecular-Weight; Warfarin
PubMed: 38749907
DOI: 10.1177/03000605241255507 -
International Heart Journal May 2024Cardiopulmonary resuscitation (CPR) is essential for the survival of cardiac arrest patients, but it can cause severe traumatic complications. In the catheterization...
Cardiopulmonary resuscitation (CPR) is essential for the survival of cardiac arrest patients, but it can cause severe traumatic complications. In the catheterization laboratory, various physical constraints complicate the appropriate performance of CPR. However, we are not aware of reports of CPR complications in this setting. Here, we report a case of coronary artery perforation (CAP) caused by manual CPR in the catheterization laboratory. The patient, a 68-year-old woman, initially underwent successful percutaneous coronary intervention (PCI) for unstable angina. Back in the ward, the patient experienced acute stent thrombosis, which resulted in cardiac arrest, and another PCI was performed under ongoing manual CPR. Although revascularization was successful, sudden CAP occurred, leading to cardiac tamponade. Despite extensive treatment efforts, the patient died 18 hours later.Initially, the compression site of CPR was on the midline of the sternum; however, the compression site shifted to the left, to just above the left anterior descending artery, by the time that CAP was detected via angiography. This corresponded to the area where rib fractures were observed upon computed tomography, suggesting the possibility of traumatic CAP due to manual CPR. The physical constraints in the catheterization laboratory can lead to an inappropriate CPR technique and severe traumatic complications.
Topics: Humans; Aged; Female; Cardiopulmonary Resuscitation; Coronary Vessels; Percutaneous Coronary Intervention; Fatal Outcome; Heart Arrest; Coronary Angiography; Cardiac Catheterization; Angina, Unstable; Cardiac Tamponade
PubMed: 38749750
DOI: 10.1536/ihj.23-549 -
BMC Gastroenterology May 2024Portal vein thrombosis (PVT) is a common complication of liver cirrhosis that can aggravate portal hypertension. However, there are features of both PVT and cirrhosis...
BACKGROUND AND AIMS
Portal vein thrombosis (PVT) is a common complication of liver cirrhosis that can aggravate portal hypertension. However, there are features of both PVT and cirrhosis that are not recapitulated in most current animal models. In this study, we aimed to establish a stable animal model of PVT and cirrhosis, intervene with anticoagulant, and explore the related mechanism.
METHODS
First, 49 male SD rats received partial portal vein ligation (PPVL), and 44 survival rats were divided into 6 groups: PPVL control group; 4-week, 6 -week, 8-week, and 10-week model group; and the rivaroxaban (RIVA)-treated group. The rats were intoxicated with or without carbon tetrachloride (CCl) for 4-10 weeks. Seven normal rats were used as the normal controls. Serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels and parameters for blood coagulation were all assayed with kits. Liver inflammation, collagen deposition and hydroxyproline (Hyp) levels were also measured. The extrahepatic macro-PVT was observed via portal vein HE staining, etc. The intrahepatic microthrombi was stained via fibrin immunohistochemistry. The portal blood flow velocity (PBFV) and diameter were detected via color Doppler ultrasound. Vascular endothelial injury was evaluated by von Willebrand Factor (vWF) immunofluorescence. Fibrinolytic activity was estimated by western blot analysis of fibrin and plasminogen activator inhibitor-1 (PAI-1).
RESULTS
After PPVL surgery and 10 weeks of CCl intoxication, a rat model that exhibited characteristics of both cirrhosis and extra and intrahepatic thrombi was established. In cirrhotic rats with PVT, the PBFV decreased, both factors of pro- and anti-coagulation decreased, but with relative hypercoagulable state, vascular endothelial injured, and fibrinolytic activity decreased. RIVA-treated rats had improved coagulation function, increased PBFV and attenuated thrombi. This effect was related to the improvements in endothelial injury and fibrinolytic activity.
CONCLUSIONS
A new rat model of PVT with cirrhosis was established through partial portal vein ligation plus CCl intoxication, with the characteristics of macrothrombi at portal veins and microthrombi in hepatic sinusoids, as well as liver cirrhosis. Rivaroxaban could attenuate PVT in cirrhosis in the model rats. The underlying mechanisms of PVT formation in the rat model and pharmacological action of rivaroxaban are related to the regulation of portal blood flow, coagulant factors, and vascular endothelial cell function.
Topics: Animals; Portal Vein; Rivaroxaban; Male; Ligation; Venous Thrombosis; Carbon Tetrachloride; Rats, Sprague-Dawley; Disease Models, Animal; Rats; Factor Xa Inhibitors; Liver Cirrhosis; Liver Cirrhosis, Experimental; Liver; Alanine Transaminase; Aspartate Aminotransferases
PubMed: 38741060
DOI: 10.1186/s12876-024-03253-4 -
PloS One 2024When clinicians need to administer a vasopressor infusion, they are faced with the choice of administration via either peripheral intravenous catheter (PIVC) or central... (Comparative Study)
Comparative Study
Randomised, controlled, feasibility trial comparing vasopressor infusion administered via peripheral cannula versus central venous catheter for critically ill adults: A study protocol.
BACKGROUND
When clinicians need to administer a vasopressor infusion, they are faced with the choice of administration via either peripheral intravenous catheter (PIVC) or central venous catheter (CVC). Vasopressor infusions have traditionally been administered via central venous catheters (CVC) rather than Peripheral Intra Venous Catheters (PIVC), primarily due to concerns of extravasation and resultant tissue injury. This practice is not guided by contemporary randomised controlled trial (RCT) evidence. Observational data suggests safety of vasopressor infusion via PIVC. To address this evidence gap, we have designed the "Vasopressors Infused via Peripheral or Central Access" (VIPCA) RCT.
METHODS
The VIPCA trial is a single-centre, feasibility, parallel-group RCT. Eligible critically ill patients requiring a vasopressor infusion will be identified by emergency department (ED) or intensive care unit (ICU) staff and randomised to receive vasopressor infusion via either PIVC or CVC. Primary outcome is feasibility, a composite of recruitment rate, proportion of eligible patients randomised, protocol fidelity, retention and missing data. Primary clinical outcome is days alive and out of hospital up to day-30. Secondary outcomes will include safety and other clinical outcomes, and process and cost measures. Specific aspects of safety related to vasopressor infusions such as extravasation, leakage, device failure, tissue injury and infection will be assessed.
DISCUSSION
VIPCA is a feasibility RCT whose outcomes will inform the feasibility and design of a multicentre Phase-3 trial comparing routes of vasopressor delivery. The exploratory economic analysis will provide input data for the full health economic analysis which will accompany any future Phase-3 RCT.
Topics: Adult; Female; Humans; Male; Catheterization, Central Venous; Catheterization, Peripheral; Central Venous Catheters; Critical Illness; Feasibility Studies; Infusions, Intravenous; Intensive Care Units; Randomized Controlled Trials as Topic; Vasoconstrictor Agents
PubMed: 38739611
DOI: 10.1371/journal.pone.0295347 -
Indian Journal of Critical Care... May 2024Kumar V. VeXUS: Do Not Drown in the ExCESS. Indian J Crit Care Med 2024;28(5):419-421.
Kumar V. VeXUS: Do Not Drown in the ExCESS. Indian J Crit Care Med 2024;28(5):419-421.
PubMed: 38738201
DOI: 10.5005/jp-journals-10071-24711