| 1. |
|
|
| 2. |
- Christensson, E., et al.
(författare)
-
Hypoxic ventilatory response after rocuronium-induced partial neuromuscular blockade in men with obstructive sleep apnoea
- 2020
-
Ingår i: Anaesthesia. - : Blackwell Publishing. - 0003-2409 .- 1365-2044. ; 75:3, s. 338-347
-
Tidskriftsartikel (refereegranskat)abstract
- Obstructive sleep apnoea and residual neuromuscular blockade are, independently, known to be risk factors for respiratory complications after major surgery. Residual effects of neuromuscular blocking agents are known to reduce the hypoxic ventilatory response in healthy volunteers. Patients with obstructive sleep apnoea have impaired control of breathing, but it is not known to what extent neuromuscular blocking agents interfere with the regulation of breathing in such patients. In a physiological study in 10 unsedated men with untreated obstructive sleep apnoea, we wished to examine if partial neuromuscular blockade had an effect on hypoxic ventilatory response (isocapnic hypoxia to oxygen saturation of 80%) and hypercapnic ventilatory response (normoxic inspired carbon dioxide 5%). The hypoxic ventilatory response was reduced by 32% (p = 0.016) during residual neuromuscular block (rocuronium to train-of-four ratio 0.7), but the hypercapnic ventilatory response was unaffected. We conclude that neuromuscular blockade specifically depresses peripheral chemosensitivity, and not respiratory muscle function since the hypercapnic ventilatory response was unaffected.
|
|
| 3. |
- Forsberg, A., et al.
(författare)
-
The Immune Response of the Human Brain to Abdominal Surgery
- 2017
-
Ingår i: Annals of Neurology. - : Wiley. - 0364-5134 .- 1531-8249. ; 81:4, s. 572-582
-
Tidskriftsartikel (refereegranskat)abstract
- Objective: Surgery launches a systemic inflammatory reaction that reaches the brain and associates with immune activation and cognitive decline. Although preclinical studies have in part described this systemic-to-brain signaling pathway, we lack information on how these changes appear in humans. This study examines the short-and long-term impact of abdominal surgery on the human brain immune system by positron emission tomography (PET) in relation to blood immune reactivity, plasma inflammatory biomarkers, and cognitive function. Methods: Eight males undergoing prostatectomy under general anesthesia were included. Prior to surgery (baseline), at postoperative days 3 to 4, and after 3 months, patients were examined using [C-11]PBR28 brain PET imaging to assess brain immune cell activation. Concurrently, systemic inflammatory biomarkers, ex vivo blood tests on immunoreactivity to lipopolysaccharide (LPS) stimulation, and cognitive function were assessed. Results: Patients showed a global downregulation of gray matter [C-11]PBR28 binding of 26 +/- 26% (mean +/- standard deviation) at 3 to 4 days postoperatively compared to baseline (p=0.023), recovering or even increasing after 3 months. LPS-induced release of the proinflammatory marker tumor necrosis factor-a in blood displayed a reduction (41 +/- 39%) on the 3rd to 4th postoperative day, corresponding to changes in [C-11]PBR28 distribution volume. Change in Stroop Color-Word Test performance between postoperative days 3 to 4 and 3 months correlated to change in [C-11]PBR28 binding (p=0.027). Interpretation: This study translates preclinical data on changes in the brain immune system after surgery to humans, and suggests an interplay between the human brain and the inflammatory response of the peripheral innate immune system. These findings may be related to postsurgical impairments of cognitive function.
|
|
| 4. |
- Christensson, A, et al.
(författare)
-
Serum prostate specific antigen complexed to alpha 1-antichymotrypsin as an indicator of prostate cancer
- 1993
-
Ingår i: Journal of Urology. - 1527-3792. ; 150:1, s. 100-105
-
Tidskriftsartikel (refereegranskat)abstract
- Prostate specific antigen (PSA) in serum has recently been shown to occur in complex with alpha 1-antichymotrypsin and as an approximately 30 kDa. noncomplexed molecular form. We characterized PSA by 3 different assays in samples from 144 patients with benign prostatic hyperplasia (BPH) and 121 with carcinoma of the prostate. One of these noncompetitive assays measured total PSA by detecting PSA complexed to serine proteinase inhibitors and the noncomplexed molecular form, a second measured only PSA in complex with alpha 1-antichymotrypsin, whereas a third detected the noncomplexed form. PSA in complex with alpha 1-antichymotrypsin was the predominant form in all patient sera. Noncomplexed PSA constituted a minor fraction that was significantly smaller in patients with untreated prostate cancer than in those with BPH (p < 0.0001). The proportion of noncomplexed PSA does not correlate to the serum concentration of PSA or that of alpha 1-antichymotrypsin. In men with a serum PSA concentration of less than 10 micrograms./l. the combination of assays measuring total PSA immunoreactivity, the noncomplexed molecular form and PSA in complex with alpha 1-antichymotrypsin may facilitate discrimination between prostate cancer and BPH.
|
|
| 5. |
- Christensson, Bengt, et al.
(författare)
-
Friction and Damage Accumulation, Formation, Morphology and Transport of Dust from Fibre Handling
- 1993
-
Ingår i: Developments in the Science and Technology of Composite Materials. ; , s. 89-94
-
Konferensbidrag (refereegranskat)abstract
- The mechanical stress build up in fibre handling, the dynamical frictional phenomena between fibres and curves surfaces and formation of dust have been studied. Typical are stick slip behaviour and threshold stress levels for formation of dust. The emissions of dust can be limited by electrostatic charging. The measured coefficients of friction of the fibres depend on the mechanical properties, micro structure, morphology and sizing of the fibres, the friction materials, the deformation rates and applied loads.
|
|
| 6. |
|
|
| 7. |
- Naver, Lars, et al.
(författare)
-
Broad spectrum of time of detection, primary symptoms and disease progression in infants with HIV-1 infection
- 2001
-
Ingår i: European Journal of Clinical Microbiology and Infectious Diseases. - : Springer Science and Business Media LLC. - 0934-9723 .- 1435-4373. ; 20:3, s. 159-166
-
Tidskriftsartikel (refereegranskat)abstract
- The relationship between time of HIV-1 detection, appearance of symptoms and disease progression was studied in all 24 HIV-1-infected infants from a cohort of 117 children who were born to HIV-1-infected mothers and monitored from birth. HIV isolation from plasma and mononuclear cells, HIV-1 DNA PCR (polymerase chain reaction) and, retrospectively, a quantitative assay for HIV-1 RNA were used for virus detection. Two infants possibly exhibited a symptomatic primary HIV infection. More children with than without symptoms during the first year of life progressed to immunological class 3 (P=0.013) and to AIDS or death (P=0.003) during follow-up. HIV-1 was detected within 4 days of age in 4 of 16 infants: 3 of them became symptomatic within 1 year, as did 6 of the remaining 12 infants (not statistically significant). All four infants in whom virus was detected within 4 days of age progressed to severe immunosuppression, compared to 6 of 14 in whom the virus detection test was initially negative prior to the first positive result (n.s.). Two children with previous repeatedly negative HIV detection tests were diagnosed with HIV-1 infection at 8 and 9 months, respectively. Repeated blood sampling is needed for the diagnosis of HIV-1 infection in perinatally exposed infants, and virus detection tests for exclusion of HIV-1 infection must be used with caution.
|
|
| 8. |
- Christensson, A, et al.
(författare)
-
The significance of serpins in the regulation of proteases in the male genital tract
- 1997
-
Ingår i: Advances in Experimental Medicine and Biology. - Boston, MA : Springer US. - 0065-2598. ; 425, s. 76-163
-
Forskningsöversikt (refereegranskat)abstract
- The male genital tract is rich in proteases, delivered by the male accessory sex glands, that are delicately balanced in their action by serpins, non-serpin class protease inhibitors and other regulatory mechanisms. Still, the biological function of the serpins and their target enzymes in the male genital tract and possible involvement in the regulation of normal reproductive function mainly remains to be elucidated. However, it is important with careful control of the catalytic activity of serine proteases, in particular in the different extracellular compartments, where they may produce significant potential hazards for biological structures. Immunochemical measurements of the serine protease prostate-specific antigen (PSA) in serum have gained widespread use in the monitoring and detection of prostate cancer. Moreover, the rapidly growing body of data on the disease-related variations in the proportion of different forms of PSA in serum which relate to the covalent complex formation between the serpin α1-antichymotrypsin and PSA has significantly improved the diagnostic specificity in blood testing for early detection of prostate cancer.
|
|
| 9. |
|
|
| 10. |
|
|
