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Negative Pressure Ventilation Ex-Situ Lung Perfusion Preserves Porcine and Human Lungs for 36-Hours.
Clin Transplant
January 2025
Division of Cardiac Surgery, Department of Surgery, Faculty of Medicine, University of Alberta, Edmonton, Canada.
Introduction: Preclinically, 24-hour continuous Ex-Situ Lung Perfusion (ESLP) is the longest duration achieved in large animal models and rejected human lungs. Here, we present our 36-hour Negative Pressure Ventilation (NPV)-ESLP protocol applied to porcine and rejected human lungs.
Methods: Five sets of donor domestic pig lungs (45-55 kg) underwent 36-hour NPV-ESLP.
Successful Ex Situ Reduction During Hypothermic Oxygenated Machine Perfusion in a Severely Steatotic Graft From a Donor After Brain Death: An Anecdote?
Exp Clin Transplant
December 2024
>From the Department of Hepatobiliary and Pancreatic Surgery and Liver Transplantation, Vall d'Hebron Hospital, Barcelona, Spain.
Marginal liver grafts, such as those from cardiac death donors and donors with steatotic organs, are highly vulnerable to ischemia-reperfusion injury. In addition, ex situ graft alteration, either by reduction or splitting, will prolong the static cold storage time and amplify the ischemia-reperfusion injury. Hypothermic oxygenated machine perfusion has the potential to end the oxygen deprivation during preservation and accordingly improve outcomes in some marginal grafts that have been traditionally discarded.
View Article and Find Full Text PDFFactors Associated With Prolonged Venous Transit in Large Vessel Occlusion Acute Ischemic Strokes.
J Neuroimaging
January 2025
Department of Radiology, Division of Neuroradiology, Johns Hopkins Medical Center, Baltimore, Maryland, USA.
Background And Purpose: Prolonged venous transit (PVT), derived from computed tomography perfusion (CTP) time-to-maximum (T) maps, reflects compromised venous outflow (VO) in acute ischemic stroke due to large vessel occlusion (AIS-LVO). Poor VO is associated with worse clinical outcomes, but pre-treatment markers predictive of PVT are not well described.
Methods: We conducted a retrospective analysis of 189 patients with anterior circulation AIS-LVO who underwent baseline CT evaluation, including non-contrast CT, CT angiography, and CTP.
Neutrophil adhesion to vessel walls impairs pulmonary circulation in COVID-19 pathology.
Nat Commun
January 2025
Division of Virology, Institute of Medical Science, University of Tokyo, Tokyo, Japan.
Microthrombus formation is associated with COVID-19 severity; however, the detailed mechanism remains unclear. In this study, we investigated mouse models with severe pneumonia caused by SARS-CoV-2 infection by using our in vivo two-photon imaging system. In the lungs of SARS-CoV-2-infected mice, increased expression of adhesion molecules in intravascular neutrophils prolonged adhesion time to the vessel wall, resulting in platelet aggregation and impaired lung perfusion.
View Article and Find Full Text PDFArterial Input Function Dispersal on Acute Brain CT Perfusion Scan in Patients With Acute Stroke and an Intracardiac Thrombus.
Neurology
February 2025
Department of Neurology, John Hunter Hospital, Newcastle, Australia.
Article Synopsis
- Hyperacute cardiac CT is more effective than transthoracic echocardiography in detecting intracardiac thrombus, but its routine use is limited due to costs and risks.
- A study of 1,136 ischemic stroke or TIA patients found that longer arterial input function (AIF) dispersal times correlate with the presence of thrombus and worse outcomes, with a specific cutoff of 33 seconds indicating higher risk.
- The findings support using AIF dispersal measurements to help identify patients who may benefit from cardiac imaging, potentially optimizing resource use in stroke management.
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