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The cerebral A(1) adenosine receptor (A(1)AR) has recently become accessible for in vivo imaging using the selective A(1)AR ligand [(18)F]CPFPX and PET. For broad application in neurosciences, imaging at distribution equilibrium is advantageous to quantify stimulus-dependent changes in receptor availability and to avoid arterial blood sampling. Here we propose a bolus/infusion (B/I) protocol to assess the total distribution volume (DV(t)) of [(18)F]CPFPX under equilibrium conditions. Employing a bolus-to-infusion ratio of 0.8 h, (near) equilibrium conditions were attained within 60 min. The regional DV(t)' given by arterial and venous equilibrium analyses agreed well with conventional two-tissue compartment model analyses (r(2) > 0.94 and r(2) > 0.84, respectively) and Logan's graphical analyses (r(2) = 1.0 and r(2) > 0.93, respectively) (n = 4 healthy volunteers). The mean regional DV(t)' values of these equilibrium analyses and of venous equilibrium analyses in additional seven volunteers demonstrated excellent agreement with the results of earlier bolus studies (r(2) > 0.98). Error simulations show that minor deviations from true equilibrium are associated with negligible to small DV(t) errors. In conclusion, [(18)F]CPFPX shows suitable characteristics for A(1)AR quantification by B/I PET scanning. Carefully standardized venous equilibrium analyses may substitute arterial analyses and thus considerably enhance applicability of A(1)AR PET in clinical routine.
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http://dx.doi.org/10.1016/j.neuroimage.2004.10.029 | DOI Listing |
Chaos
December 2024
The Medical Big Data Research Center and The School of Mathematics, Northwest University, Xi'an 710127, China.
Glutamate (Glu) is a crucial excitatory neurotransmitter in the central nervous system that transmits brain information by activating excitatory receptors on neuronal membranes. Physiological studies have demonstrated that abnormal Glu metabolism in astrocytes is closely related to the pathogenesis of epilepsy. The astrocyte metabolism processes mainly involve the Glu uptake through astrocyte EAAT2, the Glu-glutamine (Gln) conversion, and the Glu release.
View Article and Find Full Text PDFAnn Med
December 2025
Intensive Care Unit, State Institute for Infectious Diseases São Sebastião, Rio de Janeiro, Rio de Janeiro, Brazil.
Background/objectives: Pregnant and postpartum women have a higher risk for developing severe Covid-19 and other clinical and obstetric complications. This study aims to evaluate the frequency of metabolic acidosis with elevated anion gap and describe a case series of euglycemic ketoacidosis (EKA) in pregnant and postpartum women with severe confirmed or suspected Covid-19.
Materials And Methods: Observational retrospective study carried in a reference intensive care unit from May 2020 to June 2022.
Zhonghua Yu Fang Yi Xue Za Zhi
December 2024
Shenzhen Key Laboratory of Medical Laboratory and Molecular Diagnosis,Shenzhen518035,China Department of Laboratory Medicine, The Second People's Hospital of Shenzhen,Shenzhen518035,China.
To analyze the correlation of exon rs1126671 and exon rs971074 polymorphisms with risky drinking behaviors and alcoholic liver disease. The patients with alcoholic liver disease diagnosed in the Gastroenterology Department of the People's Hospital of Hechi from November 2021 to June 2022, including 52 cases of alcoholic liver disease with positive risky drinking behaviors, 103 cases of non-alcoholic liver disease with positive risky drinking behaviors of the same gender and age, and 105 healthy subjects with no risky drinking behaviors as control groups were retrospectively analyzed. The serum total protein and albumin are detected by immunoturbidimetry and globulin is calculated by the difference method; the serum total bilirubin and direct bilirubin are detected by the nitrite oxidation method and indirect bilirubin is calculated by the difference method; alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase and γ-glutamyl transferase are detected by the substrate method.
View Article and Find Full Text PDFBMC Cardiovasc Disord
December 2024
School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Background: Heart failure (HF) is among the cardiovascular diseases with high morbidity and mortality worldwide. Due to the high burden of HF, finding easy-to-use prognostic factors has become important. Studies have investigated the correlation between anion gap (AG) and the HF prognosis.
View Article and Find Full Text PDFBMC Cardiovasc Disord
December 2024
Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, 288 Tianwen Avenue, Chongqing, 401336, China.
Background: The associations between the albumin-corrected anion gap (ACAG) and all-cause mortality in patients with congestive heart failure in the intensive care unit remain uncertain. This study aimed to investigate this unknown.
Methods: The MIMIC-IV (version 3.
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