The cerebral pH of four normal human subjects has been measured using continuous inhalation of 11CO2 and positron emission tomography (PET). 11CO2 was administered to each subject at a constant rate for 15 min, during which time serial arterial plasma 11C levels were determined and serial 11C cerebral uptake PET scans were performed at a fixed axial tomographic level. 11C uptake kinetics were analysed using a three-compartment model. Rate constants have been estimated for the free exchange of 11CO2 between plasma and cerebral compartments for each subject, and their cerebral pH calculated. Whole brain pH values ranged from 6.96 to 7.05, and no significant pH difference between regions containing predominantly grey or white matter was noted. Best fits to 11C uptake data were achieved by effectively neglecting the metabolic fixation of 11C by cerebral tissue. The purpose of this study was to test the feasibility of pH measurement using the 11CO2 continuous inhalation technique. It is concluded from the results and the error analysis that continuous 11CO2 inhalation combined with PET is potentially a simple and useful method for determining regional cerebral pH.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1038/jcbfm.1984.65 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Prolactin-induced sensitization of trigeminal nociceptors promotes migraine co-morbidity in endometriosis.
Cephalalgia
January 2025
Department of Pharmacology, University of Arizona College of Medicine, Tucson, AZ, USA.
Background: Women with endometriosis are more likely to have migraine. The mechanisms underlying this co-morbidity are unknown. Prolactin, a neurohormone secreted and released into circulation from the anterior pituitary, can sensitize sensory neurons from female, but not male, rodents, monkeys and human donors.
View Article and Find Full Text PDFEarly coagulation changes as predictors of adverse outcomes in patients with severe burn and inhalation injuries.
Burns
January 2025
Department of Critical Care Medicine, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, 200120, China. Electronic address:
Background: Disorders of the coagulation pathway are triggered in patients with severe burn and inhalation injuries in the early stages. There are multiple early coagulation indices identified to correlate with adverse outcomes.
Method: A retrospective analysis of patients with severe burn and inhalation injuries from 12 centers in mainland China was performed to identify early changed coagulation indices with predictive value associated with four major 28-day adverse outcomes (death, anticoagulation, mechanical ventilation, continuous renal replacement therapy) by logistic regression.
In vitro activity of omadacycline against geographically diverse rapidly growing nontuberculous mycobacteria (NTM) clinical isolates.
Diagn Microbiol Infect Dis
December 2024
Department of Medical Microbiology, Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, The Netherlands.
Nontuberculous mycobacteria (NTM) are emerging opportunistic pathogens with limited treatment options due to resistance to multiple antibiotic classes. This study aimed to evaluate the in vitro activity of omadacycline and comparator antibiotics against rapidly growing mycobacteria (RGM) clinical isolates. Minimum inhibitory concentration (MIC) evaluation of RGM clinical isolates was performed by two independent laboratories (EU and Japan).
View Article and Find Full Text PDFA novel cytoprotective organ perfusion platform for reconstructing homeostasis of DCD liver while alleviating IRI injury.
Bioeng Transl Med
January 2025
Research Institute of Transplant Medicine, Tianjin First Central Hospital, School of Medicine, Nankai University Tianjin China.
Pump is a vital component for expelling the perfusate in small animal isolated organ normothermic machine perfusion (NMP) systems whose flexible structure and rhythmic contraction play a crucial role in maintaining perfusion system homeostasis. However, the continuous extrusion forming with the rigid stationary shaft of the peristaltic pumps can damage cells, leading to metabolic disorders and eventual dysfunction of transplanted organs. Here, we developed a novel biomimetic blood-gas system (BBGs) for preventing cell damage.
View Article and Find Full Text PDFEngineering nanoliposomal tiotropium bromide embedded in a lactose-arginine carrier forming Trojan-particle dry powders for efficient pulmonary drug delivery: A combined approach of in vitro-3D printing and in silico-CFD modeling.
Int J Pharm
January 2025
School of Mechanical and Mechatronic Engineering, University of Technology Sydney (UTS), 15 Broadway, Ultimo, New South Wales 2007, Australia. Electronic address:
Nanocarrier-based dry powders for lung disease treatment are crucial, with in vitro and in silico research being pivotal to their success. This study introduces a method for creating Tiotropium-bromide liposomal inhalation dry powder, termed "Trojan-particles," utilizing thin-film hydration and spray-drying with lactose-arginine carriers. Encapsulating tiotropium-bromide in nanoliposomes enhances lung treatment via liposomes' unique features.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!