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1.
Int Urol Nephrol ; 54(4): 781-787, 2022 Apr.
Article in English | MEDLINE | ID: mdl-35129775

ABSTRACT

PURPOSE: With sensitivities over 95%, non-contrast computer tomography of kidney, ureter and bladder (CTKUB) is the investigation of choice in renal colic to diagnose or exclude ureteric calculi. CTKUB delivers an average effective radiation dose of 5.4 millisievert (mSv) and is used to follow-up calculi not visible on plain X-ray, whereas plain radiography has a radiation exposure of 0.7 mSv and is used to follow-up radio-opaque calculi. We assessed the effectiveness of using ultra-low-dose CTKUB (ULDCTKUB) for the follow-up of ureteric calculi not visible on plain radiograph of the kidneys, ureter and bladder (KUB), as an emerging option to reduce radiation exposure compared to standard dose CTKUB. METHODS: Between 2013 and 2016 we retrospectively analysed 86 patients who underwent ULDCTKUB for CTKUB-confirmed ureteric calculi that were not visible on plain radiography. Patients were identified from our Radiology Management System with additional information from electronic patient records. RESULTS: 98% of ULDCTKUBs were of diagnostic quality; two patients required further cross-sectional imaging. 67% of patients had passed their calculi after the initial diagnostic CTKUB. In the remaining 33% who had persistent calculi on ULDCTKUB, 20% required surgical intervention and 13% required no intervention. The mean ULDCTKUB effective radiation dose was six times lower than conventional CTKUB (0.8 vs 5.4 mSv). 67% of patients had a radiation dose equivalent to X-ray KUB (< 1 mSv). CONCLUSION: ULDCTKUB is a reliable and safe follow-up investigation of ureteric calculi and has absorbed radiation doses similar to plain radiography and lower than annual background radiation. We advocate ULDCTKUB as the primary imaging modality in the follow-up of ureteric calculi not visible on plain radiograph.


Subject(s)
Ureter , Ureteral Calculi , Computers , Follow-Up Studies , Humans , Radiography , Retrospective Studies , Tomography, X-Ray Computed/methods , Ureteral Calculi/diagnostic imaging , Urinary Bladder
2.
Channels (Austin) ; 15(1): 165-179, 2021 12.
Article in English | MEDLINE | ID: mdl-33423595

ABSTRACT

Nociceptor sensitization following nerve injury or inflammation leads to chronic pain. An increase in the nociceptor hyperpolarization-activated current, Ih, is observed in many models of pathological pain. Pharmacological blockade of Ih prevents the mechanical and thermal hypersensitivity that occurs during pathological pain. Alterations in the Hyperpolarization-activated Cyclic Nucleotide-gated ion channel 2 (HCN2) mediate Ih-dependent thermal and mechanical hyperalgesia. Limited knowledge exists regarding the nature of these changes during chronic inflammatory pain. Modifications in HCN2 expression and post-translational SUMOylation have been observed in the Complete Freund's Adjuvant (CFA) model of chronic inflammatory pain. Intra-plantar injection of CFA into the rat hindpaw induces unilateral hyperalgesia that is sustained for up to 14 days following injection. The hindpaw is innervated by primary afferents in lumbar DRG, L4-6. Adjustments in HCN2 expression and SUMOylation have been well-documented for L5 DRG during the first 7 days of CFA-induced inflammation. Here, we examine bilateral L4 and L6 DRG at day 1 and day 3 post-CFA. Using L4 and L6 DRG cryosections, HCN2 expression and SUMOylation were measured with immunohistochemistry and proximity ligation assays, respectively. Our findings indicate that intra-plantar injection of CFA elicited a bilateral increase in HCN2 expression in L4 and L6 DRG at day 1, but not day 3, and enhanced HCN2 SUMOylation in ipsilateral L6 DRG at day 1 and day 3. Changes in HCN2 expression and SUMOylation were transient over this time course. Our study suggests that HCN2 is regulated by multiple mechanisms during CFA-induced inflammation.


Subject(s)
Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels , Animals , Male , Rats
3.
Mult Scler J Exp Transl Clin ; 3(1): 2055217317700167, 2017.
Article in English | MEDLINE | ID: mdl-28607754

ABSTRACT

BACKGROUND: Autologous stem cell transplantation (ASCT) for progressive multiple sclerosis (MS) may reset the immune repertoire. OBJECTIVE: The objective of this paper is to analyse lymphocyte recovery in patients with progressive MS treated with ASCT. METHODS: Patients with progressive MS not responding to conventional treatment underwent ASCT following conditioning with high-dose cyclophosphamide and antithymocyte globulin. Lymphocyte subset analysis was performed before ASCT and for two years following ASCT. Neurological function was assessed by the EDSS before ASCT and for three years post-ASCT. RESULTS: CD4+ T-cells fell significantly post-transplant and did not return to baseline levels. Recent thymic emigrants and naïve T-cells fell sharply post-transplant but returned to baseline by nine months and twelve months, respectively. T-regulatory cells declined post-transplant and did not return to baseline levels. Th1 and Th2 cells did not change significantly while Th17 cells fell post-transplant but recovered to baseline by six months. Neurological function remained stable in the majority of patients. Progression-free survival was 69% at three years. CONCLUSION: This study demonstrates major changes in the composition of lymphocyte subsets following ASCT for progressive MS. In particular, ablation and subsequent recovery of thymic output is consistent with the concept that ASCT can reset the immune repertoire in MS patients.

4.
Vet Rec ; 167(19): 734-9, 2010 Nov 06.
Article in English | MEDLINE | ID: mdl-21257508

ABSTRACT

Questionnaires were distributed to owners of cats that had undergone limb amputation in the UK, through 1000 veterinary clinics or publications relating to companion cats, or online. Between July 2009 and February 2010, responses were received relating to 234 cats, and data for 204 of these were included in subsequent analyses. The responses received provided data on signalment, aetiology, quality of life, behavioural changes and pain observed in cats after partial or total amputation of a limb. Young male domestic shorthair cats were over-represented in the sample; the most common reason for amputation was a fractured bone, and the hindlimb was almost twice as likely to be amputated as the forelimb. Although 89 per cent of the cats received analgesics/anti-inflammatories after discharge, the owners of 35 per cent of the animals observed some signs of pain during recovery. Eighty-nine per cent of the cats were thought to have regained a 'normal' quality of life as defined by the owner and 94 per cent of the owners stated that they would agree with the decision to amputate the affected limb in a pet if faced with the same decision again.


Subject(s)
Amputation, Surgical/veterinary , Behavior, Animal/physiology , Cats/surgery , Pain/veterinary , Quality of Life , Age Factors , Amputation, Surgical/psychology , Animals , Female , Humans , Male , Pain/epidemiology , Retrospective Studies , Sex Factors , Surveys and Questionnaires
5.
Anaesthesia ; 65(2): 199-203, 2010 Feb.
Article in English | MEDLINE | ID: mdl-19995349

ABSTRACT

Goal-directed coagulation therapy is essential in the management of trauma patients with severe bleeding. Due to the complex nature of coagulation disorders in trauma, a quick and reliable diagnostic tool is essential. We report a severely injured multiple trauma patient who received haemostatic therapy with coagulation factor concentrates, guided by rotational thromboelastometry (ROTEM). Initial therapy consisted of fibrinogen concentrate (Haemocomplettan P), as maximum clot firmness in the ROTEM analyses was low, whereas clotting time was normal. Later on, prothrombin complex concentrate was given to optimise thrombin generation. This approach enabled extended emergency hemihepatectomy to be performed without using fresh frozen plasma. As the EXTEM maximum clot firmness showed good clot quality, no platelets were transfused despite low platelet counts. This case shows the potential success of treatment using both fibrinogen concentrate and prothrombin complex concentrate, not only in restoring haemostasis but also in minimising requirement for transfusion of allogeneic blood products.


Subject(s)
Blood Coagulation Factors/therapeutic use , Fibrinogen/therapeutic use , Hemorrhage/drug therapy , Multiple Trauma/complications , Thrombelastography/methods , Adolescent , Drug Monitoring/methods , Drug Therapy, Combination , Female , Hemorrhage/etiology , Hemostatic Techniques , Hemostatics/therapeutic use , Humans , Liver/injuries
6.
Phys Rev Lett ; 102(5): 053001, 2009 Feb 06.
Article in English | MEDLINE | ID: mdl-19257509

ABSTRACT

We overcome the diffraction limit in fluorescence imaging of neutral atoms in a sparsely filled one-dimensional optical lattice. At a periodicity of 433 nm, we reliably infer the separation of two atoms down to nearest neighbors. We observe light induced losses of atoms occupying the same lattice site, while for atoms in adjacent lattice sites, no losses due to light induced interactions occur. Our method points towards characterization of correlated quantum states in optical lattice systems with filling factors of up to one atom per lattice site.

7.
Phys Rev Lett ; 97(24): 243003, 2006 Dec 15.
Article in English | MEDLINE | ID: mdl-17280277

ABSTRACT

We recently demonstrated that strings of trapped atoms inside a standing wave optical dipole trap can be rearranged using optical tweezers [Y. Miroshnychenko, Nature 442, 151 (2006)]. This technique allows us to actively set the interatomic separations on the scale of the individual trapping potential wells. Here, we use such a distance-control operation to insert two atoms into the same potential well. The detected success rate of this manipulation is 16(-3)(+4)%, in agreement with the predictions of a theoretical model based on our experimental parameters.

8.
Postgrad Med J ; 81(957): 481-2, 2005 Jul.
Article in English | MEDLINE | ID: mdl-15998828

ABSTRACT

Handheld computers are now a common sight in medicine, but there are scarce data on who actually uses them and what functions are found to be most useful. This is the first study of handheld computer use in a British hospital, and shows that there is already considerable use and acceptance of the technology, with 22 of 55 (40%) physicians possessing and using such a device. Doctors in training grades are more likely to make use of medical software, particularly textbooks, calculators, and formularies. The main barriers to greater use of this technology were cost of software and poor applicability to UK practice.


Subject(s)
Attitude to Computers , Computers, Handheld/statistics & numerical data , Medical Staff, Hospital/psychology , Computers, Handheld/trends , England , Female , Hospitals, District , Hospitals, General , Humans , Male , Software , Surveys and Questionnaires
9.
Int J Legal Med ; 115(1): 29-39, 2001 Aug.
Article in English | MEDLINE | ID: mdl-11599766

ABSTRACT

We have compiled a database of mitochondrial DNA (mtDNA) control region, hypervariable regions 1 (HVR1) and 2 (HVR2) sequences of a total of 14,138 individuals compiled from 103 mtDNA publications before 1 January 2000, 13 data sets published in 2000 and 2001 and 2 unpublished data sets of Iraqi Kurds and Indians from Kerala. By contacting the authors and by other means, we have confirmed and corrected sequence errors, eliminated duplications and harmonised the sequence format. These changes affected all but 26 of the 116 publications. Furthermore, we have implemented a geographic information system ("mtradius") which searches for closest matches to a given mtDNA control region sequence and displays them on a geographic map. A potential application is to estimate a chance matching probability when a forensic stain and a suspect have an identical mtDNA sequence: we suggest that the geographic area with the highest frequency of closely related mtDNA sequence types may be used to define a reference population to give the suspect the maximum benefit of doubt in accordance with the ceiling principle.


Subject(s)
DNA Fingerprinting , DNA, Mitochondrial/genetics , Databases, Nucleic Acid , Forensic Medicine , Genetics, Population , Humans , India , Iraq
10.
Mol Membr Biol ; 18(1): 3-11, 2001.
Article in English | MEDLINE | ID: mdl-11396609

ABSTRACT

Renal and small intestinal (re-)absorption contribute to overall phosphate(Pi)-homeostasis. In both epithelia, apical sodium (Na+)/Pi-cotransport across the luminal (brush border) membrane is rate limiting and the target for physiological/pathophysiological alterations. Three different Na/Pi-cotransporters have been identified: (i) type I cotransporter(s)--present in the proximal tubule--also show anion channel function and may play a role in secretion of organic anions; in the brain, it may serve vesicular glutamate uptake functions; (ii) type II cotransporter(s) seem to serve rather specific epithelial functions; in the renal proximal tubule (type Ila) and in the small intestine (type IIb), isoform determines Na+-dependent transcellular Pi-movements; (iii) type III cotransporters are expressed in many different cells/tissues where they could serve housekeeping functions. In the small intestine, alterations in Pi-absorption and, thus, apical expression of IIb protein are mostly in response to longer term (days) situations (altered Pi-intake, levels of 1.25 (OH2) vitamin D3, growth, etc), whereas in renal proximal tubule, in addition, hormonal effects (e.g. Parathyroid Hormone, PTH) acutely control (minutes/hours) the expression of the IIa cotransporter. The type II Na/Pi-cotransporters operate (as functional monomers) in a 3 Na+:1 Pi stoichiometry, including transfer of negatively charged (-1) empty carriers and electroneutral transfers of partially loaded carriers (1 Na+, slippage) and of the fully loaded carriers (3 Na+, 1 Pi). By a chimera (IIa/IIb) approach, and by site-directed mutagenesis (including cysteine-scanning), specific sequences have been identified contributing to either apical expression, PTH-induced membrane retrieval, Na+-interaction or specific pH-dependence of the IIa and IIIb cotransporters. For the COOH-terminal tail of the IIa Na/Pi-cotransporter, several interacting PDZ-domain proteins have been identified which may contribute to either its apical expression (NaPi-Cap1) or to its subapical/lysosomal traffic (NaPi-Cap2).


Subject(s)
Intestine, Small/metabolism , Kidney Tubules/metabolism , Phosphates/metabolism , Absorption , Amino Acid Sequence , Animals , Biological Transport , Cell Line , Endocytosis , Humans , Kinetics , Models, Biological , Molecular Sequence Data , Protein Isoforms , Protein Structure, Tertiary , Transfection , Two-Hybrid System Techniques
11.
J Clin Pathol ; 53(10): 791-3, 2000 Oct.
Article in English | MEDLINE | ID: mdl-11064676

ABSTRACT

AIMS: To explore the role of the Peutz-Jeghers gene (LKB1) in sporadic breast and colon cancers. METHODS: Thirty consecutive sporadic carcinomas of the breast and 23 of the colon were selected. DNA was extracted from paraffin wax embedded tissue and analysed for loss of heterozygosity (LOH) at microsatellite markers D19S886 and D19S565 close to the LKB1 gene. Tumours showing LOH were screened for LKB1 mutations by single strand conformational polymorphism (SSCP). RESULTS: Five breast carcinomas showed LOH (21% and 7% of those informative for D19S886 and D19S565, respectively). Five of the colorectal carcinomas showed LOH (15% and 36% of those informative for D19S886 and D19S565, respectively), with one sample showing allele loss with both markers. Screening of these 10 carcinomas by SSCP identified one migrational shift but sequencing revealed an intronic polymorphism only. Therefore, no coding mutations were found in these carcinomas. CONCLUSIONS: These findings suggest that although allele loss at the LKB1 locus occurs relatively frequently in sporadic breast and colon cancers, mutations do not seem to be a feature.


Subject(s)
Breast Neoplasms/genetics , Colonic Neoplasms/genetics , Neoplasm Proteins/genetics , Peutz-Jeghers Syndrome/genetics , Protein Serine-Threonine Kinases/genetics , AMP-Activated Protein Kinase Kinases , Female , Genetic Markers , Humans , Loss of Heterozygosity , Mutation
12.
Ann Clin Biochem ; 37 ( Pt 5): 649-54, 2000 Sep.
Article in English | MEDLINE | ID: mdl-11026517

ABSTRACT

The soluble adhesion molecules P-selectin (sP-selectin) and intercellular adhesion molecule-1 (sICAM-1) are derived from platelets and endothelial cells. Circulating concentrations of these soluble adhesion molecules are raised in patients with atherosclerosis and following percutaneous transluminal coronary angioplasty (PTCA). We have investigated the effects of vitamin E supplements (800 IU/day) on circulating plasma ICAM-1 and P-selectin levels pre- and post-PTCA. Patients, randomized to group, were pre-treated with vitamin E or placebo (soybean oil) for 1 month before routine PTCA. Plasma sICAM-1 and sP-selectin were measured by enzyme-linked immunosorbent assay on blood taken immediately pre- and post-PTCA. Total protein and alpha-tocopherol were measured on the same samples. Plasma alpha-tocopherol concentrations increased in patients receiving vitamin E: 19.1 (1.5) [mean (standard error of the mean, SEM)] mg/mL post-PTCA versus 13.9 (0.6) mg/mL pre-PTCA (n=23; P<0.01). Plasma sP-selectin and sICAM-1 levels were not significantly increased following PTCA in the vitamin E group. Pre-angioplasty mean (SEM) plasma sP-selectin concentration in the vitamin E group was 8.83 (0.97) ng/mg protein; the corresponding mean post-angioplasty value was 9.34 (0.89) ng/mg protein (P=0.85). The mean (SEM) pre-angioplasty sICAM-1 concentration in this group was 2.18 (0.24) ng/mg protein, and was 2.20 (0.23) ng/mg protein following angioplasty (P = 0.84). In the placebo group (n = 24) there was a significant increase in mean (SEM) sP-selectin concentration following angioplasty, from 7.48 (0.73) to 9.70 (0.78) ng/mg protein (P<0.05). The change (mean, SEM) in plasma sP-selectin concentration following angioplasty was significantly greater for the placebo group [2.22 (0.50) ng/mg protein] than for the group receiving vitamin E [0.50 (0.50) ng/mg protein] (P<0.02). This difference remained significant (P<0.05) even after adjustment for pre-angioplasty P-selectin concentrations. Mean (SEM) plasma sICAM-1 concentrations remained unchanged following angioplasty [pre-angioplasty: 2.16 (0.20) ng/mg protein; post-angioplasty: 1.97 (0.13) ng/mg protein]. Vitamin E may therefore limit platelet or endothelial activation during PTCA.


Subject(s)
Angioplasty, Balloon, Coronary , Intercellular Adhesion Molecule-1/blood , P-Selectin/blood , Platelet Activation/drug effects , Vitamin E/administration & dosage , Adult , Aged , Aged, 80 and over , Coronary Disease/therapy , Dietary Supplements , Endothelium, Vascular/cytology , Endothelium, Vascular/drug effects , Enzyme-Linked Immunosorbent Assay , Female , Humans , Male , Middle Aged , Vitamin E/blood , Vitamin E/pharmacology
13.
Atherosclerosis ; 151(2): 463-9, 2000 Aug.
Article in English | MEDLINE | ID: mdl-10924723

ABSTRACT

Mononuclear cells and platelets are intimately involved in the pathogenesis and complications of cardiovascular disease. Platelet activation has been reported in hypertension, though the activation-state of monocytes has received less attention. In this study the adhesiveness of monocytes and platelets was assessed and any relationship between the adhesive properties of these cellular elements and plasma levels of soluble adhesion molecules and blood pressure parameters determined. Fifty six elderly volunteers, of whom 32 were classified hypertensive (daytime SBP > or = 135 mmHg), underwent 24 h blood pressure monitoring, assessment of monocyte and platelet adhesion and measurement of the plasma soluble adhesion molecules ICAM-1, L-selectin, E-selectin and vWF. In the elderly hypertensive subjects, monocyte adhesion to collagen coated (P < 0.05) and tissue culture plastic microwells (P < 0.05) was significantly elevated and circulating levels of soluble ICAM-1 (P < 0.01) and soluble E-selectin (P < 0.05) were significantly raised compared to their normotensive counterparts. A significant correlation was found to exist between monocyte adhesion to collagen and daytime pulse pressure (r = 0.39, P < 0.01) and also between plasma levels of soluble E-selectin and clinic DBP (r = 0.40, P < 0.001). The increased monocyte adhesion witnessed in hypertensive subjects and with increasing pulse pressure may contribute to the increased risk of cardiovascular disease in hypertension. Whether this increased adhesiveness is a property of the monocytes. or reflects endothelial cell activation, remains to be determined.


Subject(s)
Aging/physiology , Blood Pressure/physiology , Collagen/physiology , Monocytes/physiology , Pulse , Aged , Cell Adhesion/physiology , Cell Adhesion Molecules/blood , Diastole , Female , Humans , Hypertension/physiopathology , Male , Platelet Adhesiveness/physiology , Solubility
14.
J Psychopharmacol ; 14(2): 157-63, 2000 Jun.
Article in English | MEDLINE | ID: mdl-10890310

ABSTRACT

Acute tryptophan depletion (ATD) studies have been used to assess the role of the serotonergic system in various aspects of human behaviour. Changes in mood have already been described in selected groups of individuals submitted to ATD. The present study was a randomized, double-blind, cross-over trial designed to evaluate the effects of ATD on mood, memory, attention and induced anxiety in normal male volunteers. Twelve healthy male volunteers were submitted to two separate sessions of ATD, 1 week apart. Drinks containing either a balanced mixture of amino acids (B) or a similar mixture devoid of tryptophan (T-) were administered in each session. Mood was assessed using self-rating scales. Attention and memory were assessed using a battery of psychological tests. Anxiety induction was carried out using a simulation of public speaking. Blood levels of tryptophan were assessed before and after the B and T- drinks. Results showed that ATD markedly decreased plasma tryptophan (p < 0.0001). Mood ratings, memory and attention were not changed by the T- drink. There was no difference among the anxiety levels measured under T- or B mixtures. These data supports the notion that ATD does not change mood and cognitive function in healthy subjects.


Subject(s)
Behavior/physiology , Tryptophan/physiology , Adult , Affect/drug effects , Anxiety/psychology , Attention/drug effects , Cross-Over Studies , Diet , Double-Blind Method , Emotions/drug effects , Humans , Male , Memory/drug effects , Psychiatric Status Rating Scales , Tryptophan/blood
15.
Biochem Biophys Res Commun ; 273(2): 505-8, 2000 Jul 05.
Article in English | MEDLINE | ID: mdl-10873635

ABSTRACT

Estrogen sulfatase and sulfotransferase (EST) activities are present in breast cancer tissues but there are no reports on EST in cancerous bone cells. We incubated [(3)H]estradiol-17beta with cells from a canine osteosarcoma D17 line for periods up to 24 h. Radioactive steroids were recovered from the media and separated into unconjugated and conjugated fractions using Sep-Pak C18 cartridges. The conjugate fraction was solvolyzed and the resulting free steroids were obtained from a second C18 cartridge. Little metabolism was apparent in 4 h of incubation, but by 24 h as much as one half of the radioactivity was seen in the conjugate fraction. Most of the conjugates were recovered as sulfates in all three experiments. HPLC profiles showed a limited metabolism of estradiol to other compounds except for estrone, which was clearly present in both free and sulfate fractions. These results suggest that EST may have a role in the local metabolism of estrogens in bone.


Subject(s)
Bone Neoplasms/enzymology , Osteosarcoma/enzymology , Sulfotransferases/metabolism , Animals , Bone and Bones/metabolism , Breast Neoplasms/enzymology , Chromatography, High Pressure Liquid , Dogs , Estradiol/metabolism , Female , Humans , Sulfatases/metabolism , Tumor Cells, Cultured
16.
J Hypertens ; 18(4): 411-5, 2000 Apr.
Article in English | MEDLINE | ID: mdl-10779091

ABSTRACT

OBJECTIVES: To determine the effect of oral vitamin C supplements on ambulatory blood pressure and plasma lipids. DESIGN: A 6-month double-blind randomized placebo-controlled cross-over study with a 1 -week washout between cross-over periods. METHODS: Vitamin C 500 mg daily or matching placebo was given to 40 men and women aged between 60 and 80 years for 3 months each in a cross-over fashion. Clinic and 24-h ambulatory blood pressure, plasma ascorbate and lipids were measured at baseline and at the end of each cross-over phase. RESULTS: Clinic blood pressure did not change between placebo and vitamin C phases. Daytime ambulatory blood pressure showed a small but significant fall in systolic blood pressure (2.0 +/- 5.2 mmHg; 95% confidence interval 0-3.9 mmHg) but not in diastolic blood pressure. Regression analysis showed that with increasing baseline daytime blood pressure the fall in blood pressure with vitamin C supplementation increased. Regression analysis of the change in high-density lipoprotein (HDL) cholesterol showed a significant effect of sex on the change in HDL cholesterol. In women, but not men, HDL cholesterol increased significantly by 0.08 +/- 0.11 mmol/l, P=0.007. There was no change in low-density lipoprotein cholesterol between treatment periods. CONCLUSION: In older adults high intakes of ascorbic acid have modest effects on lowering high systolic blood pressure, which could contribute to the reported association between higher vitamin C intake and lower risk of cardiovascular disease and stroke.


Subject(s)
Aging/physiology , Ascorbic Acid/pharmacology , Blood Pressure/drug effects , Lipids/blood , Aged , Aged, 80 and over , Aging/blood , Ascorbic Acid/blood , Blood Pressure Monitoring, Ambulatory , Cross-Over Studies , Dose-Response Relationship, Drug , Double-Blind Method , Female , Humans , Hypertension/physiopathology , Male , Reference Values , Systole
17.
Int J Exp Pathol ; 81(1): 57-62, 2000 Feb.
Article in English | MEDLINE | ID: mdl-10718865

ABSTRACT

Vitamin E, the major lipid soluble plasma antioxidant, has been reported to be reduced in patients with coronary atherosclerosis. We have measured the levels of plasma alpha-tocopherol (the predominant form of plasma vitamin E) in 128 patients with different reported degrees of angina. Patients with mild to moderate angina (grades I or II (CSS score)) (n = 64), and patients with severe angina (grades III and IV) (n = 64) were recruited from Cardiology Clinics in the U. K. Healthy controls (n = 33) and patients with hyperlipidaemia (n = 28) were also recruited. The groups of patients with angina did not differ significantly for mean age (58 +/- 1.0 years vs. 59 +/- 1.0 years, respectively); sex distribution (the M:F ratio was 48 : 16 and 46 : 18 for the respective groups); or prevalence of smoking (12% vs. 9%), or hypertension (19% vs. 33%). Total cholesterol levels were higher in the group with severe angina (5.9 +/- 0.16 mmol/l vs. 5.3 +/- 0.13 mmol/l P < 0.05). Absolute levels of plasma vitamin E were not significantly different between the angina subgroups (12.9 +/- 0.40 mg/l for the mild-moderate angina group vs. 12.5 +/- 0.51 mg/l for the severely affected group), but were positively correlated with plasma cholesterol concentrations in each case (P < 0.001). The ratio between plasma vitamin E: total cholesterol was significantly lower in the patients with severe angina (mean 2.20 +/- 0.09 mg/mmol) vs. a mean value of 2.46 +/- 0. 08 mg/m mol in the mildly affected group (P < 0.05). The plasma vitamin E: total cholesterol ratio in patients with severe angina was also significantly lower (P < 0.05) compared to either healthy controls with comparable total cholesterol levels (n = 33), or hypercholesterolaemic subjects (n = 28) without symptomatic coronary disease (mean ratios were 2.69 +/- 0.40 mg/mmol and 2.74 +/- 0.68 mg/mmol, respectively). Vitamin E has previously been demonstrated to protect endothelial function in the presence of hypercholesterolaemia, possibly by preserving nitric oxide bio-activity. It also inhibits LDL oxidation. Hence, a high plasma vitamin E: total cholesterol ratio may be associated with an amelioration of angina.


Subject(s)
Angina Pectoris/blood , Vitamin E/blood , Adult , Aged , Case-Control Studies , Cholesterol/blood , Female , Humans , Hyperlipidemias/blood , Male , Middle Aged , Severity of Illness Index
18.
Int J Exp Pathol ; 80(4): 227-34, 1999 Aug.
Article in English | MEDLINE | ID: mdl-10583632

ABSTRACT

Recent epidemiological studies have provided evidence supporting the potential benefits of antioxidants in coronary prevention. We have investigated the effects of vitamin E on platelets, monocytes and endothelial cells in vitro. Pre-incubation of platelets with vitamin E inhibited subsequent thrombin- (P < 0.05, n = 5), collagen- (P < 0. 0001, n = 5) and ADP-(P < 0.05, n = 4) induced platelet aggregation measured using a microtitre plate method, or conventional aggregometry. The adhesion of thrombin-activated platelets to collagen was also inhibited by vitamin E (P < 0.05, n = 8), but not by vitamin C (P > 0.05, n = 8); nor was the adhesion of unstimulated platelets significantly affected (P > 0.05, n = 8). Pre-incubation of monocytes with vitamin E inhibited their subsequent adhesion to plastic (P < 0.05, n = 9), and was also associated with an 18% reduction in adhesion to EA.hy 926 endothelial cells (n = 8), although this failed to reach statistical significance. Pre-incubation of the endothelial cells with vitamin E also significantly reduced subsequent mononuclear cell adhesion by 56% (P < 0.05, n = 3).


Subject(s)
Blood Platelets/drug effects , Monocytes/drug effects , Vitamin E/pharmacology , Adult , Ascorbic Acid/pharmacology , Cell Adhesion/drug effects , Cell Culture Techniques , Humans , Middle Aged , Monocytes/physiology , Platelet Adhesiveness/drug effects , Platelet Aggregation/drug effects
19.
Rev Saude Publica ; 32(3): 273-80, 1998 Jun.
Article in English | MEDLINE | ID: mdl-9778863

ABSTRACT

OBJECTIVE: This is a study to evaluate friendships in latency street boys of Porto Alegre, RGS, Brazil. METHODS: A sample of 30 latency street boys was compared with a sample of 51 latency boys living with their low income families, using the Cornell Interview of Peers and Friends (CIPF). RESULTS: The two groups had a significantly different CIPF global scores, and the boys of the street group had the highest mean score. Also, boys of the street had significantly lower developmental appropriateness, self-esteem and social skills scores than boys living with a family. CONCLUSIONS: The urgent need for intervention street children, especially on boys of the street, is emphasized.


Subject(s)
Homeless Youth/psychology , Interpersonal Relations , Brazil , Child , Child Development , Family , Humans , Interviews as Topic , Male , Social Class , Spatial Behavior , Surveys and Questionnaires
20.
Int J Obes Relat Metab Disord ; 22(5): 432-9, 1998 May.
Article in English | MEDLINE | ID: mdl-9622340

ABSTRACT

OBJECTIVE: To investigate the associations of indices of adiposity with cardiovascular risk factors. SUBJECTS: 93 men and 98 women aged 18-69 y. OUTCOME MEASURES: Body mass index (BMI), waist to hip ratio (WHR), waist circumference, waist to height ratio, blood pressure, fasting concentrations of blood glucose, insulin, plasma lipids and lipoprotein subfractions, apoproteins, lipoprotein(a) and post-heparin lipases. RESULTS: BMI and waist showed similar associations (P < 0.01) with a cluster of major cardiovascular risk factors including total cholesterol, low density lipoprotein-cholesterol and very low density lipoprotein-cholesterol in men, and ratio of low density lipoprotein-/high density lipoprotein-cholesterol for both genders. Large waist circumference was significantly (P < 0.01) associated (controlled for age and smoking) with features of the metabolic syndrome, including raised insulin concentration (men: r=0.37, women: r=0.49), reduced high density lipoprotein2 (men: r=-0.30, women: r=-0.34), increased very low density lipoprotein1 mass (men: r=0.31, women: r=0.42), raised small, dense low density lipoprotein (men: r=0.30, women: r=0.31), elevated blood pressure (men: r=0.27, women: r=0.28), increased triglyceride (men: r=0.43, women: r=0.48) and apolipoprotein-B (men: r=0.32, women: r=0.35). Waist circumference also correlated with hepatic lipase/lipoprotein lipase ratio in women (r=0.52). Height adjustment did not substantially change relationships between waist circumference and risk factors. WHR correlated with fewer risk factors. CONCLUSION: For the purpose of health promotion to prevent cardiovascular disease associated with overweight and intra-abdominal fat accumulation, the general public should be advised to be aware of the risk associated with large waist circumference.


Subject(s)
Adipose Tissue , Arteriosclerosis/blood , Body Composition , Lipoproteins/blood , Adolescent , Adult , Aged , Blood Glucose/metabolism , Blood Pressure , Body Constitution , Body Mass Index , Female , Humans , Insulin/blood , Lipase/blood , Lipids/blood , Male , Middle Aged , Risk Factors
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