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Åneman, Oscar
Publications (5 of 5) Show all publications
Rejmstad, P., Åkesson, G., Åneman, O. & Wårdell, K. (2016). A laser Doppler system for monitoring of cerebral microcirculation: implementation and evaluation during neurosurgery. Medical and Biological Engineering and Computing, 54(1), 123-131
Open this publication in new window or tab >>A laser Doppler system for monitoring of cerebral microcirculation: implementation and evaluation during neurosurgery
2016 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, ISSN 0140-0118, Vol. 54, no 1, p. 123-131Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to adapt and evaluate laser Doppler perfusion monitoring (LDPM) together with custom designed brain probes and software for continuous recording of cerebral microcirculation in patients undergoing neurosurgery. The LDPM system was used to record perfusion and backscattered light (TLI). These parameters were displayed together with the extracted heart rate (HR), pulsatility index (PI) and signal trends from adjustable time intervals. Technical evaluation was done on skin during thermal provocation. Clinical measurements were performed on ten patients undergoing brain tumour surgery. Data from 76 tissue sites were captured with a length varying between 10 s to 15 min. Statistical comparisons were done using Mann-Whitney tests. Grey and tumour tissue could be separated from white matter using the TLI-signal (p < 0.05). The perfusion was significantly higher in grey and tumour tissue compared to white matter (p < 0.005). LDPM was successfully used as an intraoperative tool for monitoring local blood flow and additional parameters linked to cerebral microcirculation (perfusion, TLI, heart rate and PI) during tumour resection. The systems stability opens up for studies in the postoperative care of patients with e.g. traumatic brain injury or subarachnoid haemorrhage.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2016
Keywords
Microcirculation, Brain tumour Laser Doppler perfusion monitoring (LDPM), Pulsatility index (PI), Neurosurgery
National Category
Medical Laboratory and Measurements Technologies
Identifiers
urn:nbn:se:liu:diva-120632 (URN)10.1007/s11517-015-1332-5 (DOI)000371437900010 ()26105147 (PubMedID)
Funder
Swedish Research Council, 6212-010-4216
Available from: 2015-08-20 Created: 2015-08-20 Last updated: 2017-12-04Bibliographically approved
Wårdell, K., Zsigmond, P., Rejmstad, P., Åneman, O. & Hillman, J. (2013). Combined laser Doppler and reflectance spectroscopy measurements during brain surgery. In: : . Paper presented at Computer Assisted Radiology and Surgery Heidelberg (pp. 96-97).
Open this publication in new window or tab >>Combined laser Doppler and reflectance spectroscopy measurements during brain surgery
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2013 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Other Medical Engineering
Identifiers
urn:nbn:se:liu:diva-97363 (URN)
Conference
Computer Assisted Radiology and Surgery Heidelberg
Available from: 2013-09-10 Created: 2013-09-10 Last updated: 2017-02-03Bibliographically approved
Mellergård, P., Åneman, O., Sjögren, F., Säberg, C. & Hillman, J. (2011). Differences in Cerebral Extracellular Response of Interleukin-1 beta, Interleukin-6, and Interleukin-10 After Subarachnoid Hemorrhage or Severe Head Trauma in Humans. NEUROSURGERY, 68(1), 12-19
Open this publication in new window or tab >>Differences in Cerebral Extracellular Response of Interleukin-1 beta, Interleukin-6, and Interleukin-10 After Subarachnoid Hemorrhage or Severe Head Trauma in Humans
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2011 (English)In: NEUROSURGERY, ISSN 0148-396X, Vol. 68, no 1, p. 12-19Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Microdialysis has become a routine method for biochemical surveillance of patients in neurosurgical intensive care units. OBJECTIVE: To analyze the intracerebral extracellular levels of 3 interleukins (ILs) during the 7 days after major subarachnoid hemorrhage or traumatic brain injury). METHODS: Microdialysate from 145 severely injured neurosurgical intensive care unit patients (88 with subarachnoid hemorrhage, 57 with traumatic brain injury) was collected every 6 hours for 7 days. The concentrations of IL-1 beta and IL-6 were determined by fluorescence multiplex bead technology, and IL-10 was determined by enzyme-linked immunosorbent assay. RESULTS: Presented are the response patterns of 3 ILs during the first week after 2 different types of major brain injury. These patterns are different for each IL and also differ with respect to the kind of pathological impact. For both IL-1 beta and IL-6, the initial peaks (mean values for all patients at day 2 being 26.9 +/- 4.5 and 4399 +/- 848 pg/mL, respectively) were followed by a gradual decline, with IL-6 values remaining 100-fold higher compared with IL-1 beta. Female patients showed a stronger and more sustained response. The response of IL-10 was different, with mean values less than 23 pg/mL and with no significant variation between any of the postimpact days. For all 3 ILs, the responses were stronger in subarachnoid hemorrhage patients. The study also indicates that under normal conditions, IL-1 beta, IL-6, and IL-10 are present only at very low concentrations or not at all in the extracellular space of the human brain. CONCLUSION: This is the first report presenting in some detail the human cerebral response of IL-1 beta, IL-6, and IL-10 after subarachnoid hemorrhage and traumatic brain injury. The 3 ILs have different reaction patterns, with the response of IL-1 beta and IL-6 being related to the type of cerebral damage sustained, whereas the IL-10 response was less varied.

Place, publisher, year, edition, pages
Williams and Wilkins, 2011
Keywords
Interleukins, Interleukin-1, Interleukin-6, Interleukin-10, Microdialysis, Subarachnoid hemorrhage, Traumatic brain injury
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-64237 (URN)10.1227/NEU.0b013e3181ef2a40 (DOI)000285288200018 ()
Available from: 2011-01-17 Created: 2011-01-17 Last updated: 2012-04-02
Mellergård, P., Åneman, O., Sjögren, F., Pettersson, P. & Hillman, J. (2008). Changes in Extracellular Concentrations of Some Cytokines, Chemokines, and Neurotrophic Factors After Insertion of Intracerebral Microdialysis Catheters in Neurosurgical Patients. Neurosurgery, 62(1), 151-157
Open this publication in new window or tab >>Changes in Extracellular Concentrations of Some Cytokines, Chemokines, and Neurotrophic Factors After Insertion of Intracerebral Microdialysis Catheters in Neurosurgical Patients
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2008 (English)In: Neurosurgery, ISSN 0148-396X, E-ISSN 1524-4040, Vol. 62, no 1, p. 151-157Article in journal (Refereed) Published
Abstract [en]

OBJECTIVE: The extracellular levels of eight different inflammatory agents were analyzed during the initial 36 hours after insertion of microdialysis catheters in patients. METHODS: Cerebral extracellular fluid from 38 patients who were treated in a neurosurgical intensive care unit for severe brain injury was collected every 6 hours for 36 hours. The concentration of interleukin (IL)-1ß, IL-6, IL-8, macrophage inflammatory protein-1ß, regulated on activation, normal T-cell expressed and secreted (RANTES), fibroblast growth factor-2, and vascular endothelial growth factor was determined by a multiplex assay, and IL-10 was determined by enzyme-linked immunosorbent assay. RESULTS: This is the first report regarding the presence of IL-10, IL-8, macrophage inflammatory protein-1ß, regulated on activation, T-cell expressed and secreted, vascular endothelial growth factor, and fibroblast growth factor-2 in the tissue level proper of the living human brain. The study also provides new information regarding the response of IL-1ß and IL-6 after insertion of a microdialysis catheter. The study confirms that the intriguing patterns of interplay between different components of the inflammatory response studied in laboratory settings are present in the human brain. This was most clearly observed in the variations in response between the three different chemokines investigated, as well as in the rapid and transient response of fibroblast growth factor-2. CONCLUSION: The data presented illustrate the opportunity to monitor biochemical events of possible importance in the human brain and indicate the potential of such monitoring in neurosurgical intensive care. The study also underlines that any analysis of events in the brain involving mechanical invasiveness needs to take into account biochemical changes that are directly related to the manipulation of brain tissue.

Keywords
Chemokine, Cytokine, Head trauma, Intensive care, Microdialysis, Monitoring, Neurotrophic factor, Subarachnoidal hemorrhage
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-47988 (URN)10.1227/01.NEU.0000311072.33615.3A (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Hillman, J., Åneman, O., Persson, M., Anderson, C., Dabrosin, C. & Mellergård, P. (2007). Variations in the response of interleukins in neurosurgical intensive care patients monitored using intracerebral microdialysis. Journal of Neurosurgery, 106(5), 820-825
Open this publication in new window or tab >>Variations in the response of interleukins in neurosurgical intensive care patients monitored using intracerebral microdialysis
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2007 (English)In: Journal of Neurosurgery, ISSN 0022-3085, E-ISSN 1933-0693, Vol. 106, no 5, p. 820-825Article in journal (Refereed) Published
Abstract [en]

Object. The aim of this study was to make a preliminary evaluation of whether microdialysis monitoring of cytokines and other proteins in severely diseased neurosurgical patients has the potential of adding significant information to optimize care, thus broadening the understanding of the function of these molecules in brain injury. Methods. Paired intracerebral microdialysis catheters with high-cutoff membranes were inserted in 14 comatose patients who had been treated in a neurosurgical intensive care unit following subarachnoidal hemorrhage or traumatic brain injury. Samples were collected every 6 hours (for up to 7 days) and were analyzed at bedside for routine metabolites and later in the laboratory for interleukin (IL)-1 and IL-6, in two patients, vascular endothelial growth factor and cathepsin-D were also checked. Aggregated microprobe data gave rough estimations of profound focal cytokine responses related to morphological tissue injury and to anaerobic metabolism that were not evident from the concomitantly collected cerebrospinal fluid data. Data regarding tissue with no macroscopic evidence of injury demonstrated that IL release not only is elicited in severely compromised tissue but also may be a general phenomenon in brains subjected to stress. Macroscopic tissue injury was strongly linked to IL-6 but not IL-1b activation. Furthermore, IL release seems to be stimulated by local ischemia. The basal tissue concentration level of IL-1b was estimated in the range of 10 to 150 pg/ml, for IL-6, the corresponding figure was 1000 to 20,000 pg/ml. Conclusions. Data in the present study indicate that catheters with high-cutoff membranes have the potential of expanding microdialysis to the study of protein chemistry as a routine bedside method in neurointensive care.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-41714 (URN)10.3171/jns.2007.106.5.820 (DOI)58821 (Local ID)58821 (Archive number)58821 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13
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