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  1. Article: CSF spectrophotometry in the diagnosis of subarachnoid haemorrhage.

    Iversen, S A

    Journal of clinical pathology

    2001  Volume 55, Issue 8, Page(s) 640

    MeSH term(s) False Positive Reactions ; Humans ; Iodine ; Specimen Handling ; Spectrophotometry ; Spinal Puncture ; Subarachnoid Hemorrhage/cerebrospinal fluid ; Subarachnoid Hemorrhage/diagnosis
    Chemical Substances Iodine (9679TC07X4)
    Language English
    Publishing date 2001-02-06
    Publishing country England
    Document type Comment ; Letter
    ZDB-ID 80261-x
    ISSN 1472-4146 ; 0021-9746
    ISSN (online) 1472-4146
    ISSN 0021-9746
    DOI 10.1136/jcp.55.8.640
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  2. Article: Simultaneous quantitation of homocysteine, cysteine and methionine in plasma and urine by liquid chromatography-tandem mass spectrometry.

    Weaving, G / Rocks, B F / Iversen, S A / Titheradge, M A

    Annals of clinical biochemistry

    2006  Volume 43, Issue Pt 6, Page(s) 474–480

    Abstract: Background: A method utilizing liquid chromatography-electrospray tandem mass spectrometry (LC-MS/MS) has been developed and evaluated for the determination of total homocysteine, cysteine and methionine in plasma and urine. The simultaneous measurement ...

    Abstract Background: A method utilizing liquid chromatography-electrospray tandem mass spectrometry (LC-MS/MS) has been developed and evaluated for the determination of total homocysteine, cysteine and methionine in plasma and urine. The simultaneous measurement of homocysteine and methionine concentrations may help explain the underlying mechanism responsible for hyperhomo-cysteinaemia.
    Methods: Samples were prepared by simple protein precipitation after reduction of disulphides by dithiothreitol. Reduced analyte signal caused by ionization suppression effects, seen with plasma samples, was compensated for with matrix-matched standards, and the use of isotopically labelled internal standards. Recovery for each analyte was better than 94%.
    Results: Concentrations of plasma homocysteine determined by LC-MS/MS were compared with those obtained by two automated commercially available FDA-approved procedures: (i) high-performance liquid chromatography (HPLC) with pre-column derivatization and fluorescence detection and (ii) by fluorescence polarization immunoassay (FPIA). Agreement with the LC-MS/MS method is given by the Deming regression equations LC-MS/MS = 1.062 HPLC-0.01 and LC-MS/MS = 1.104 FPIA-0.43.
    Conclusion: Low reagent costs together with the relative simplicity of sample preparation make the LC-MS/MS method well suited, not only for research work but also in those laboratories with a tandem mass spectrometer, for the measurement of routine clinical samples.
    MeSH term(s) Chromatography, High Pressure Liquid/methods ; Cysteine/blood ; Cysteine/urine ; Cystine/blood ; Homocysteine/blood ; Homocysteine/urine ; Humans ; Methionine/blood ; Methionine/urine ; Reproducibility of Results ; Tandem Mass Spectrometry/methods
    Chemical Substances Homocysteine (0LVT1QZ0BA) ; Cystine (48TCX9A1VT) ; Methionine (AE28F7PNPL) ; Cysteine (K848JZ4886)
    Language English
    Publishing date 2006-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 390309-6
    ISSN 1758-1001 ; 0004-5632
    ISSN (online) 1758-1001
    ISSN 0004-5632
    DOI 10.1258/000456306778904605
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  3. Article: Behavioural and psychological symptoms of Alzheimer type dementia are not correlated with plasma homocysteine concentration.

    Tabet, N / Rafi, H / Weaving, G / Lyons, B / Iversen, S A

    Dementia and geriatric cognitive disorders

    2006  Volume 22, Issue 5-6, Page(s) 432–438

    Abstract: Background/aims: Vitamin B12 and folate deficiencies have been associated with cognitive impairment and various psychiatric symptoms but not specifically with behavioural and psychological symptoms of dementia (BPSD). A limitation of previous studies in ...

    Abstract Background/aims: Vitamin B12 and folate deficiencies have been associated with cognitive impairment and various psychiatric symptoms but not specifically with behavioural and psychological symptoms of dementia (BPSD). A limitation of previous studies in dementia was lack of concurrent homocysteine measurement especially as it may provide a better indicator of tissue activities of these vitamins. This study was designed to clarify whether a relationship exists between plasma homocysteine concentration and BPSD.
    Methods: Plasma homocysteine, serum vitamin B12 and folate were measured in 23 Alzheimer's disease (AD) patients with BPSD and 27 AD patients without BPSD as determined through the use of the Neuropsychiatric Inventory (NPI). Blood levels of measured substances were also correlated with individual NPI scores and with cumulative NPI scores for different cluster of symptoms.
    Results: There was no significant difference (p = 0.956) in the mean plasma homocysteine levels between AD patients with BPSD (17.48 micromol/l) and AD patients without BPSD (17.34 micromol/l). Similarly, there was no significant difference between the two groups in the mean serum B12 (382.61 and 391.60 pg/ml, respectively) and folate (7.95 and 10.02 ng/ml, respectively). Mean levels for both vitamins were well within the laboratory reference range. Neither individual nor cluster NPI scores correlated significantly with plasma homocysteine.
    Conclusion: This study shows for the first time that BPSD are not associated with hyperhomocysteinaemia in Alzheimer dementia. Although previous studies have identified homocysteine as an independent risk factor in AD, the results reported here do not lend weight to an aetiological role for homocysteine specifically in BPSD.
    MeSH term(s) Aged ; Aged, 80 and over ; Alzheimer Disease/blood ; Alzheimer Disease/diagnosis ; Alzheimer Disease/psychology ; Female ; Folic Acid/blood ; Homocysteine/blood ; Humans ; Male ; Mental Disorders/diagnosis ; Mental Disorders/etiology ; Mental Disorders/psychology ; Neuropsychological Tests ; Psychological Tests ; Severity of Illness Index ; Vitamin B 12/blood
    Chemical Substances Homocysteine (0LVT1QZ0BA) ; Folic Acid (935E97BOY8) ; Vitamin B 12 (P6YC3EG204)
    Language English
    Publishing date 2006
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1026007-9
    ISSN 1420-8008 ; 1013-7424
    ISSN 1420-8008 ; 1013-7424
    DOI 10.1159/000095802
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  4. Article: Limitation of the Vitros dry-slide technique in measuring high concentrations of salicylate in plasma.

    Iversen, S A / Walker, A / Avades, T Y / Wilson, J F

    Annals of clinical biochemistry

    2001  Volume 38, Issue Pt 6, Page(s) 711–713

    Abstract: The linearity of the Vitros dry-slide method for plasma salicylate was assessed in two ways: serial concentrations of sodium salicylate were added to fresh lithium heparin plasma, and the salicylate was determined both neat and in dilution. Vitros ... ...

    Abstract The linearity of the Vitros dry-slide method for plasma salicylate was assessed in two ways: serial concentrations of sodium salicylate were added to fresh lithium heparin plasma, and the salicylate was determined both neat and in dilution. Vitros salicylate results submitted to the Heathcontrol External Quality Assessment Scheme were compared to the spike value. Similar loss of linearity was observed in both cases. Serious salicylate overdosage requiring specific clinical treatment may have been underestimated.
    MeSH term(s) Blood Chemical Analysis/instrumentation ; Blood Chemical Analysis/methods ; Blood Chemical Analysis/standards ; Blood Chemical Analysis/statistics & numerical data ; Drug Overdose/blood ; Drug Overdose/diagnosis ; False Negative Reactions ; Humans ; Quality Control ; Reference Standards ; Salicylic Acid/blood ; Salicylic Acid/poisoning ; Salicylic Acid/standards
    Chemical Substances Salicylic Acid (O414PZ4LPZ)
    Language English
    Publishing date 2001-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 390309-6
    ISSN 1758-1001 ; 0004-5632
    ISSN (online) 1758-1001
    ISSN 0004-5632
    DOI 10.1258/0004563011900948
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  5. Article: Does routine blood bone biochemistry predict vitamin D insufficiency in elderly patients with low-velocity fractures?

    Singh, S K / Manjure, S / Stott, P / Shetty, A / Iversen, S A / Williams, C R

    Journal of orthopaedic surgery (Hong Kong)

    2004  Volume 12, Issue 1, Page(s) 31–34

    Abstract: Purpose: Vitamin D deficiency impairs bone mineralisation and can predispose individuals to fractures. This study aimed at testing whether measurement of plasma calcium, alkaline phosphatase, and phosphate levels could detect vitamin D insufficiency.: ...

    Abstract Purpose: Vitamin D deficiency impairs bone mineralisation and can predispose individuals to fractures. This study aimed at testing whether measurement of plasma calcium, alkaline phosphatase, and phosphate levels could detect vitamin D insufficiency.
    Methods: During a 10-week winter period from December 2000 to February 2001, all elderly patients presenting to a general hospital in Brighton--British seaside town--with a fracture of the proximal femur and without known bone mineralisation problems were invited to participate in the study.
    Results: 23 (63.9%) of the 36 eligible patients had insufficient levels of vitamin D, with a plasma concentration of less than 30 nmol/L. The mean parathyroid hormone level was 56 pg/mL (range, 12-193 pg/mL). 11 of the 36 patients had an elevated level of parathyroid hormone were insufficient in vitamin D. The mean plasma concentration of calcium was 2.30 mmol/L (range, 2.05-2.98 mmol/L). The mean phosphate level was 0.98 mmol/L (range, 0.40-1.79 mmol/L), and the mean alkaline phosphatase level was 91 IU/L (range, 46-127 IU/L). There was poor correlation between vitamin D insufficiency and plasma calcium, alkaline phosphatase, or phosphate levels.
    Conclusion: Plasma calcium, alkaline phosphatase, and phosphate testing cannot detect vitamin D insufficiency. We recommend that vitamin D and calcium supplementation be considered for patients with low-energy hip fractures.
    MeSH term(s) Accidental Falls ; Age Factors ; Aged ; Aged, 80 and over ; Blood Chemical Analysis ; Bone Density/physiology ; Cohort Studies ; Diagnostic Tests, Routine ; Female ; Geriatric Assessment ; Hip Fractures/blood ; Hip Fractures/epidemiology ; Hip Fractures/therapy ; Humans ; Incidence ; Injury Severity Score ; Male ; Osteoporosis/complications ; Osteoporosis/diagnosis ; Predictive Value of Tests ; Primary Prevention/methods ; Risk Assessment ; Sex Factors ; United Kingdom/epidemiology ; Vitamin D Deficiency/complications ; Vitamin D Deficiency/diagnosis
    Language English
    Publishing date 2004-06
    Publishing country England
    Document type Comparative Study ; Journal Article
    ZDB-ID 1493368-8
    ISSN 1022-5536
    ISSN 1022-5536
    DOI 10.1177/230949900401200107
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  6. Article: The acceptability of resin therapy to patients attending a hospital lipid clinic.

    Iversen, S A / Davidson, D / Davidson, C

    British journal of clinical pharmacology

    1995  Volume 40, Issue 1, Page(s) 92–94

    Abstract: Low dose cholestyramine ('Questran A') and colestipol ('Colestid Orange') were compared in a blinded two period crossover study of 55 patients attending a hospital lipid clinic. Colestipol was rated higher on a combined acceptability/palatability score. ... ...

    Abstract Low dose cholestyramine ('Questran A') and colestipol ('Colestid Orange') were compared in a blinded two period crossover study of 55 patients attending a hospital lipid clinic. Colestipol was rated higher on a combined acceptability/palatability score. Both treatments reduced low density lipoprotein (LDL) cholesterol to a similar extent.
    MeSH term(s) Adolescent ; Adult ; Aged ; Anion Exchange Resins/therapeutic use ; Anticholesteremic Agents/therapeutic use ; Cholesterol, LDL/blood ; Cholestyramine Resin/therapeutic use ; Colestipol/therapeutic use ; Cross-Over Studies ; Female ; Humans ; Hypercholesterolemia/blood ; Hypercholesterolemia/drug therapy ; Hypolipidemic Agents/therapeutic use ; Inpatients ; Male ; Middle Aged ; Surveys and Questionnaires
    Chemical Substances Anion Exchange Resins ; Anticholesteremic Agents ; Cholesterol, LDL ; Hypolipidemic Agents ; Cholestyramine Resin (11041-12-6) ; Colestipol (K50N755924)
    Language English
    Publishing date 1995-07
    Publishing country England
    Document type Clinical Trial ; Journal Article ; Randomized Controlled Trial ; Research Support, Non-U.S. Gov't
    ZDB-ID 188974-6
    ISSN 1365-2125 ; 0306-5251 ; 0264-3774
    ISSN (online) 1365-2125
    ISSN 0306-5251 ; 0264-3774
    DOI 10.1111/j.1365-2125.1995.tb04542.x
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  7. Article ; Online: Intensive care doctors' preferences for arterial oxygen tension levels in mechanically ventilated patients.

    Schjørring, O L / Toft-Petersen, A P / Kusk, K H / Mouncey, P / Sørensen, E E / Berezowicz, P / Bestle, M H / Bülow, H-H / Bundgaard, H / Christensen, S / Iversen, S A / Kirkeby-Garstad, I / Krarup, K B / Kruse, M / Laake, J H / Liboriussen, L / Laebel, R L / Okkonen, M / Poulsen, L M /
    Russell, L / Sjövall, F / Sunde, K / Søreide, E / Waldau, T / Walli, A R / Perner, A / Wetterslev, J / Rasmussen, B S

    Acta anaesthesiologica Scandinavica

    2018  Volume 62, Issue 10, Page(s) 1443–1451

    Abstract: Background: Oxygen is liberally administered in intensive care units (ICUs). Nevertheless, ICU doctors' preferences for supplementing oxygen are inadequately described. The aim was to identify ICU doctors' preferences for arterial oxygenation levels in ... ...

    Abstract Background: Oxygen is liberally administered in intensive care units (ICUs). Nevertheless, ICU doctors' preferences for supplementing oxygen are inadequately described. The aim was to identify ICU doctors' preferences for arterial oxygenation levels in mechanically ventilated adult ICU patients.
    Methods: In April to August 2016, an online multiple-choice 17-part-questionnaire was distributed to 1080 ICU doctors in seven Northern European countries. Repeated reminder e-mails were sent. The study ended in October 2016.
    Results: The response rate was 63%. When evaluating oxygenation 52% of respondents rated arterial oxygen tension (PaO
    Conclusion: Intensive care unit doctors preferred PaO
    MeSH term(s) Humans ; Intensive Care Units ; Oxygen/blood ; Oxygen/toxicity ; Physicians ; Pulmonary Disease, Chronic Obstructive/metabolism ; Respiration, Artificial ; Respiratory Distress Syndrome, Adult/metabolism
    Chemical Substances Oxygen (S88TT14065)
    Language English
    Publishing date 2018-06-21
    Publishing country England
    Document type Journal Article ; Multicenter Study ; Research Support, Non-U.S. Gov't
    ZDB-ID 80002-8
    ISSN 1399-6576 ; 0001-5172
    ISSN (online) 1399-6576
    ISSN 0001-5172
    DOI 10.1111/aas.13171
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  8. Article: Direct measurement of low density lipoprotein in whole blood by silver-enhanced gold-labelled immunoassay.

    Patel, N / Rocks, B F / Iversen, S A

    Annals of clinical biochemistry

    1992  Volume 29 Pt 3, Page(s) 283–286

    Abstract: A competitive silver-enhanced gold-labelled immunoassay has been developed for the direct measurement of low density lipoprotein (LDL) in whole blood. Immobilized LDL and sample LDL compete for added antibody. Quantitation of the bound antibody/antigen ... ...

    Abstract A competitive silver-enhanced gold-labelled immunoassay has been developed for the direct measurement of low density lipoprotein (LDL) in whole blood. Immobilized LDL and sample LDL compete for added antibody. Quantitation of the bound antibody/antigen complex is achieved by the addition of gold-labelled anti-immunoglobulin G followed by enhancement of absorbance by addition of silver ions. Whole-blood samples from fasting patients were assayed directly for LDL by the procedure and the corresponding plasma samples were assayed for total cholesterol, high density lipoprotein and triglycerides followed by the indirect calculation of LDL cholesterol. The correlation between the two methods was good (r = 0.82) and the SEGLISA exhibited good precision.
    MeSH term(s) Cardiovascular Diseases/blood ; Gold ; Humans ; Immunoassay/methods ; Lipoproteins, LDL/blood ; Silver/pharmacology
    Chemical Substances Lipoproteins, LDL ; Silver (3M4G523W1G) ; Gold (7440-57-5)
    Language English
    Publishing date 1992-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 390309-6
    ISSN 1758-1001 ; 0004-5632
    ISSN (online) 1758-1001
    ISSN 0004-5632
    DOI 10.1177/000456329202900305
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  9. Article: Direct measurement of low density lipoprotein in whole blood.

    Patel, N / Rocks, B F / Iversen, S A

    Clinical biochemistry

    1992  Volume 25, Issue 5, Page(s) 401–403

    MeSH term(s) Humans ; Immunoassay/methods ; Lipoproteins, LDL/blood
    Chemical Substances Lipoproteins, LDL
    Language English
    Publishing date 1992-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 390372-2
    ISSN 0009-9120
    ISSN 0009-9120
    DOI 10.1016/0009-9120(92)80025-c
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  10. Article: Phylogeography and population history of Atlantic mackerel (Scomber scombrus L.): a genealogical approach reveals genetic structuring among the eastern Atlantic stocks.

    Nesbø, C L / Rueness, E K / Iversen, S A / Skagen, D W / Jakobsen, K S

    Proceedings. Biological sciences

    2000  Volume 267, Issue 1440, Page(s) 281–292

    Abstract: Despite the resolving power of DNA markers, pelagic and migratory marine fish species generally show very little geographical population structuring. In mackerel (Scomber scombrus L.) population differentiation has been detected only at a transatlantic ... ...

    Abstract Despite the resolving power of DNA markers, pelagic and migratory marine fish species generally show very little geographical population structuring. In mackerel (Scomber scombrus L.) population differentiation has been detected only at a transatlantic scale. By applying two regions in mitochondrial DNA (mtDNA) (D-loop and cytochrome b (cytb)) in combination with genealogical and frequency-based statistical approaches, our data suggest population differentiation among eastern Atlantic spawning stocks. In contrast, and indicative of homing behaviour, no genetic structuring was observed among shoals of individuals outside the spawning season. Among spawning stocks, mtDNA D-loop sequences detected differentiation within the eastern Atlantic, while the cytb gene detected transatlantic differentiation. The impact of recurrent events (e.g. gene flow restricted by isolation by distance) and historic events (e.g. population range expansions) among spawning stocks was investigated applying a nested cladistic analysis of geographical distribution of cytb haplotype lineages. In the eastern Atlantic, historical population range expansion, presumably in connection with recolonization of northern areas after the last glaciation, is suggested to be the main factor determining mtDNA lineage distribution. This was supported by estimates of mtDNA nucleotide diversity, where the highest diversity was observed for the stock spawning in the Bay of Biscay, for which the size estimate is only 15% of the largest stock (Celtic Sea). In addition to revealing population differentiation, our data demonstrate the importance of sampling strategy and the power of applying statistical methods addressing both ongoing and historical population processes.
    MeSH term(s) Animals ; Atlantic Ocean ; Cytochrome b Group/genetics ; DNA, Mitochondrial/genetics ; Genetic Variation ; Haplotypes ; Perciformes/classification ; Perciformes/genetics ; Perciformes/physiology ; Phylogeny ; Sequence Analysis, DNA
    Chemical Substances Cytochrome b Group ; DNA, Mitochondrial
    Language English
    Publishing date 2000-02-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209242-6
    ISSN 1471-2954 ; 0962-8452 ; 0080-4649 ; 0950-1193
    ISSN (online) 1471-2954
    ISSN 0962-8452 ; 0080-4649 ; 0950-1193
    DOI 10.1098/rspb.2000.0998
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