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Christoffersen T, Riis T, Sonne DP, Klarskov N. Single-dose Tadalafil Reduces Opening Urethral Pressure: A Randomized, Double-blind, Placebo-controlled, Crossover Trial in Healthy Women. Int Urogynecol J 2024; 35:723-729. [PMID: 38456894 PMCID: PMC11024010 DOI: 10.1007/s00192-024-05757-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 02/02/2024] [Indexed: 03/09/2024]
Abstract
INTRODUCTION AND HYPOTHESIS Phosphodiesterase enzymes are widely distributed in female urogenital tissues. Yet, the understanding of their physiological roles and the impact of phosphodiesterase inhibitors on lower urinary tract symptoms in women remains limited. Current hypotheses are conflicting: one suggests that vasodilation might expand the periurethral vascular plexus, leading to increased urethral pressure, whereas the other proposes a relaxation of urethral musculature, resulting in decreased pressure. To further clarify this, we investigated the effect of tadalafil on the opening urethral pressure and voiding function in healthy women. METHODS We conducted a randomized, double-blind, placebo-controlled crossover trial involving 24 healthy women. Participants were randomly assigned to receive a single dose of tadalafil (40 mg) or placebo during their initial visit and then switched to the alternative treatment during their second visit. Opening urethral pressure was measured with urethral pressure reflectometry during both resting and squeezing conditions of the pelvic floor. Subsequently, voiding parameters were recorded. RESULTS Compared with placebo, a single dose of tadalafil significantly reduced opening urethral pressure during both resting (-6.8 cmH20; 95% confidence interval [CI], -11.8 to -1.9; p = 0.009) and squeezing conditions (-8.8 cmH20; 95% CI, -14.6 to -3.1; p = 0.005). Voiding parameters did not show significant differences (average flow rate: -0.8 ml/s [95% CI, -2.0 to 0.4; p = 0.2]; maximum flow rate: -1.7 ml/s [95% CI, -4.8 to 1.5; p = 0.3]). CONCLUSIONS A single dose of 40 mg tadalafil moderately reduced urethral pressure in healthy women, without affecting voiding parameters. The clinical implications of this are yet to be determined.
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Affiliation(s)
- Thea Christoffersen
- Department of Clinical Pharmacology, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Bispebjerg Bakke 23, 2400, Copenhagen, Denmark.
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
| | - Troels Riis
- Department of Clinical Pharmacology, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Bispebjerg Bakke 23, 2400, Copenhagen, Denmark
| | - David P Sonne
- Department of Clinical Pharmacology, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Bispebjerg Bakke 23, 2400, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Niels Klarskov
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
- Department of Gynecology and Obstetrics, Copenhagen University Hospital - Herlev and Gentofte, Herlev, Denmark
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Holm-Weber T, Skov F, Mohanakumar S, Thorup L, Riis T, Christensen MB, Sonne DP, Jensen PB, Bødtkjer DB, Hjortdal VE. Octreotide improves human lymphatic fluid transport a translational trial. Eur J Cardiothorac Surg 2024; 65:ezad380. [PMID: 37951584 PMCID: PMC10832356 DOI: 10.1093/ejcts/ezad380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 10/17/2023] [Accepted: 11/08/2023] [Indexed: 11/14/2023] Open
Abstract
OBJECTIVES Chylothorax is a complex condition and many different pharmacological agents have been tried as treatment. Octreotide is used off-label to treat chylothorax, but the efficacy of octreotide remains unclear. A decrease in lymph production is suggested as the mechanism. In this cross-over study, we explore the direct effect of octreotide on human lymphatic drainage. METHODS Pre-clinical: the effect of octreotide on force generation was assessed during acute and prolonged drug incubation on human lymphatic vessels mounted in a myograph. Clinical: in a double-blinded, randomized, cross-over trial including 16 healthy adults, we administered either octreotide or saline as an intravenous infusion for 2.5 h. Near-infrared fluorescence imaging was used to examine spontaneous lymphatic contractions and lymph pressure in peripheral lymphatic vessels and plethysmography was performed to assess the capillary filtration rate, capillary filtration coefficient and isovolumetric pressures of the lower leg. RESULTS Pre-clinical: human thoracic duct (n = 12) contraction rate was concentration-dependently stimulated by octreotide with a maximum effect at 10 and 100 nmol/l in the myograph chamber. Clinical: spontaneous lymphatic contractions and lymph pressure evaluated by near-infrared fluorescence did not differ between octreotide or placebo (P = 0.36). Plethysmography revealed similar capillary filtration coefficients (P = 0.057), but almost a doubling of the isovolumetric pressures (P = 0.005) during octreotide infusion. CONCLUSIONS Octreotide stimulated lymphatic contractility in the pre-clinical setup but did not affect the spontaneous lymphatic contractions or lymph pressure in healthy individuals. Plethysmography revealed a doubling in the isovolumetric pressure. These results suggest that octreotide increases lymphatic drainage capacity in situations with high lymphatic afterload.
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Affiliation(s)
| | - Frederik Skov
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | | | - Lene Thorup
- Department of Thoracic Surgery, Rigshospitalet, Copenhagen, Denmark
| | - Troels Riis
- Department of Clinical Pharmacology, Copenhagen University Hospital—Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - Mikkel Bring Christensen
- Department of Clinical Pharmacology, Copenhagen University Hospital—Bispebjerg and Frederiksberg, Copenhagen, Denmark
- Copenhagen Center for Translational Research, Copenhagen University Hospital—Bispebjerg and Frederiksberg, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - David Peick Sonne
- Department of Clinical Pharmacology, Copenhagen University Hospital—Bispebjerg and Frederiksberg, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Per Bo Jensen
- Department of Biochemistry, Bispebjerg Hospital, Copenhagen, Denmark
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Christoffersen T, Kornholt J, Riis T, Sonne J, Sonne DP, Klarskov N. Effect of single doses of citalopram and reboxetine on urethral pressure: A randomized, double-blind, placebo- and active-controlled three-period crossover study in healthy women. Neurourol Urodyn 2022; 41:1482-1488. [PMID: 35771361 PMCID: PMC9542537 DOI: 10.1002/nau.24985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 05/16/2022] [Accepted: 05/24/2022] [Indexed: 11/10/2022]
Abstract
AIMS Urethral closure function is essential for urinary continence in women and decreased urethral pressure is associated with stress urinary incontinence (SUI). For decades, the effects of serotonergic drugs on central neural control of urethral closure have been investigated and discussed. Epidemiological studies suggest that the use of selective serotonin reuptake inhibitors (SSRIs), such as citalopram, is associated with SUI. However, the literature findings are conflicting. This study aimed to evaluate citalopram's effect on opening urethral pressure (OUP) in healthy women. METHODS We conducted a randomized, double-blind, placebo- and active-controlled crossover study in 24 healthy women. On three study days, which were separated by 8 days of washout, the subjects received single doses of either 40 mg citalopram (and placeboreboxetine ), 8 mg reboxetine (and placebocitalopram ), or two placebos. Study drugs were administered at a 1-h interval due to a difference in estimated time to peak plasma concentration (tmax ). We measured OUP with urethral pressure reflectometry under both resting and squeezing conditions of the pelvic floor at estimated tmax for both study drugs (one timepoint). RESULTS Compared to placebo, citalopram increased OUP by 6.6 cmH2 0 (95% confidence interval [CI] 0.04-13.1, p = 0.048) in resting condition. In squeezing condition, OUP increased by 7.1 cmH2 0 (95% CI: 1.3-12.9, p = 0.01). Reboxetine increased OUP by 30.0 cmH2 0 in resting condition compared to placebo (95% CI: 23.5-36.5, p < 0.001), and 27.0 cmH2 0 (95% CI: 21.2-32.8, p < 0.001) in squeezing condition. CONCLUSION Citalopram increased OUP slightly compared to placebo suggesting that SSRI treatment does not induce or aggravate SUI.
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Affiliation(s)
- Thea Christoffersen
- Department of Clinical Pharmacology, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jonatan Kornholt
- Department of Clinical Pharmacology, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Troels Riis
- Department of Clinical Pharmacology, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Jesper Sonne
- Department of Clinical Pharmacology, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - David P Sonne
- Department of Clinical Pharmacology, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Niels Klarskov
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Gynecology and Obstetrics, Herlev and Gentofte Hospital, University of Copenhagen, Herlev, Denmark
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4
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Manolaki P, Mouridsen MB, Nielsen E, Olesen A, Jensen SM, Lauridsen TL, Baattrup-Pedersen A, Sorrell BK, Riis T. A comparison of nutrient uptake efficiency and growth rate between different macrophyte growth forms. J Environ Manage 2020; 274:111181. [PMID: 32810679 DOI: 10.1016/j.jenvman.2020.111181] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 07/16/2020] [Accepted: 08/01/2020] [Indexed: 06/11/2023]
Abstract
Aquatic macrophytes grow abundantly in many lowland streams and play a key role in ecosystem functioning, such as nutrient retention. In this study, we performed a microcosm experiment to quantify and compare the contribution of two freshwater macrophyte growth forms to nutrient cycling. We measured and compared inorganic nitrogen (NH4-N and NO3-N) and phosphorus (PO4-P) uptake kinetic parameters (Vmax and Cmin) in 12 submerged and seven amphibious plant species. We tested whether relative growth rate (RGR) was related to high Vmax and low Cmin, and quantified changes in nutrient uptake kinetic in a subset of six out of 19 plants species during the growth season. Uptake rates of NH4-N were higher in submerged compared to amphibious plants, whereas uptake rates of NO3-N were significantly higher in amphibious species; PO4-P uptake kinetics were not significantly different between the two growth forms. There were also significant seasonal differences in Vmax NH4-N rate among both submerged and amphibious species and in Vmax NO3-N among amphibious species. Highest uptake rates were observed in summer for both submerged and amphibious species. Overall, we found that nutrient uptake kinetics differed between the two growth forms within and between seasons. Consequently, the presence of both growth forms should extend the period of nutrient uptake across the year and enhance nutrient uptake within seasons. We conclude that higher functional diversity enhances annual nutrient uptake in streams and that stream restoration efforts should consider increasing the niche space available for both submerged and amphibious species.
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Affiliation(s)
- P Manolaki
- Aarhus Institute of Advanced Studies, Aarhus University, Aarhus, Denmark; Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark.
| | - M B Mouridsen
- Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark
| | - E Nielsen
- Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark
| | - A Olesen
- Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark
| | - S M Jensen
- Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark
| | - T L Lauridsen
- Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark
| | - A Baattrup-Pedersen
- Department of Bioscience, Aarhus University, Vejlsøvej 25, P.O. Box 314, DK-8600, Silkeborg, Denmark
| | - B K Sorrell
- Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark
| | - T Riis
- Department of Biology, Aarhus University, Ole Worms Allé 1, Aarhus, Denmark
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5
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Petersen KM, Bøgevig S, Riis T, Andersson NW, Dalhoff KP, Holst JJ, Knop FK, Faber J, Petersen TS, Christensen MB. High-Dose Glucagon Has Hemodynamic Effects Regardless of Cardiac Beta-Adrenoceptor Blockade: A Randomized Clinical Trial. J Am Heart Assoc 2020; 9:e016828. [PMID: 33103603 PMCID: PMC7763418 DOI: 10.1161/jaha.120.016828] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Background Intravenous high-dose glucagon is a recommended antidote against beta-blocker poisonings, but clinical effects are unclear. We therefore investigated hemodynamic effects and safety of high-dose glucagon with and without concomitant beta-blockade. Methods and Results In a randomized crossover study, 10 healthy men received combinations of esmolol (1.25 mg/kg bolus+0.75 mg/kg/min infusion), glucagon (50 µg/kg), and identical volumes of saline placebo on 5 separate days in random order (saline+saline; esmolol+saline; esmolol+glucagon bolus; saline+glucagon infusion; saline+glucagon bolus). On individual days, esmolol/saline was infused from -15 to 30 minutes. Glucagon/saline was administered from 0 minutes as a 2-minute intravenous bolus or as a 30-minute infusion (same total glucagon dose). End points were hemodynamic and adverse effects of glucagon compared with saline. Compared with saline, glucagon bolus increased mean heart rate by 13.0 beats per minute (95% CI, 8.0-18.0; P<0.001), systolic blood pressure by 15.6 mm Hg (95% CI, 8.0-23.2; P=0.002), diastolic blood pressure by 9.4 mm Hg (95% CI, 6.3-12.6; P<0.001), and cardiac output by 18.0 % (95% CI, 9.7-26.9; P=0.003) at the 5-minute time point on days without beta-blockade. Similar effects of glucagon bolus occurred on days with beta-blockade and between 15 and 30 minutes during infusion. Hemodynamic effects of glucagon thus reflected pharmacologic glucagon plasma concentrations. Glucagon-induced nausea occurred in 80% of participants despite ondansetron pretreatment. Conclusions High-dose glucagon boluses had significant hemodynamic effects regardless of beta-blockade. A glucagon infusion had comparable and apparently longer-lasting effects compared with bolus, indicating that infusion may be preferable to bolus injections. Registration Information URL: https://www.clinicaltrials.gov; Unique identifier: NCT03533179.
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Affiliation(s)
- Kasper M Petersen
- Department of Clinical Pharmacology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark
| | - Søren Bøgevig
- Department of Clinical Pharmacology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark
| | - Troels Riis
- Department of Clinical Pharmacology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark
| | - Niklas W Andersson
- Department of Clinical Pharmacology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark
| | - Kim P Dalhoff
- Department of Clinical Pharmacology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark.,Department of Clinical Medicine Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
| | - Jens J Holst
- Novo Nordisk Foundation Center for Basic Metabolic Research Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark.,Department of Biomedical Sciences Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
| | - Filip K Knop
- Novo Nordisk Foundation Center for Basic Metabolic Research Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark.,Department of Clinical Medicine Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark.,Center for Clinical Metabolic Research Gentofte HospitalUniversity of Copenhagen Hellerup Denmark.,Steno Diabetes Center Copenhagen Gentofte Denmark
| | - Jens Faber
- Department of Medicine Herlev HospitalUniversity of Copenhagen Copenhagen Denmark
| | - Tonny S Petersen
- Department of Clinical Pharmacology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark.,Department of Clinical Medicine Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
| | - Mikkel B Christensen
- Department of Clinical Pharmacology Bispebjerg Hospital University of Copenhagen Copenhagen Denmark.,Department of Clinical Medicine Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark.,Center for Clinical Metabolic Research Gentofte HospitalUniversity of Copenhagen Hellerup Denmark
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6
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Keller PS, Catalán N, von Schiller D, Grossart HP, Koschorreck M, Obrador B, Frassl MA, Karakaya N, Barros N, Howitt JA, Mendoza-Lera C, Pastor A, Flaim G, Aben R, Riis T, Arce MI, Onandia G, Paranaíba JR, Linkhorst A, Del Campo R, Amado AM, Cauvy-Fraunié S, Brothers S, Condon J, Mendonça RF, Reverey F, Rõõm EI, Datry T, Roland F, Laas A, Obertegger U, Park JH, Wang H, Kosten S, Gómez R, Feijoó C, Elosegi A, Sánchez-Montoya MM, Finlayson CM, Melita M, Oliveira Junior ES, Muniz CC, Gómez-Gener L, Leigh C, Zhang Q, Marcé R. Global CO 2 emissions from dry inland waters share common drivers across ecosystems. Nat Commun 2020; 11:2126. [PMID: 32358532 PMCID: PMC7195363 DOI: 10.1038/s41467-020-15929-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 04/03/2020] [Indexed: 12/01/2022] Open
Abstract
Many inland waters exhibit complete or partial desiccation, or have vanished due to global change, exposing sediments to the atmosphere. Yet, data on carbon dioxide (CO2) emissions from these sediments are too scarce to upscale emissions for global estimates or to understand their fundamental drivers. Here, we present the results of a global survey covering 196 dry inland waters across diverse ecosystem types and climate zones. We show that their CO2 emissions share fundamental drivers and constitute a substantial fraction of the carbon cycled by inland waters. CO2 emissions were consistent across ecosystem types and climate zones, with local characteristics explaining much of the variability. Accounting for such emissions increases global estimates of carbon emissions from inland waters by 6% (~0.12 Pg C y-1). Our results indicate that emissions from dry inland waters represent a significant and likely increasing component of the inland waters carbon cycle.
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Affiliation(s)
- P S Keller
- Department of Lake Research, Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany.
| | - N Catalán
- Catalan Institute for Water Research (ICRA), Girona, Spain
- Universitat de Girona, Girona, Spain
| | - D von Schiller
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
| | - H-P Grossart
- Department Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Neuglobsow, Germany
- Institute of Biology and Biochemistry, Potsdam University, Potsdam, Germany
| | - M Koschorreck
- Department of Lake Research, Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany
| | - B Obrador
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
| | - M A Frassl
- Department of Lake Research, Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany
- Australian Rivers Institute, Griffith University, Nathan, QLD, Australia
| | - N Karakaya
- Department of Environmental Engineering, Bolu Abant Izzet Baysal University, Bolu, Turkey
| | - N Barros
- Biology Department, Federal University of Juiz de Fora, Minas Gerais, Brazil
| | - J A Howitt
- School of Agricultural and Wine Sciences, Institute for Land, Water and Society, Charles Sturt University, Wagga Wagga, NSW, Australia
| | - C Mendoza-Lera
- INRAE, UR RiverLy, Centre de Lyon-Villeurbanne, Villeurbanne, France
| | - A Pastor
- Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - G Flaim
- Department of Sustainable Agro-ecosystems and Bioresources, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - R Aben
- Department of Aquatic Ecology and Environmental Biology, Institute for Water and Wetland Research, Radboud University, Nijmegen, the Netherlands
| | - T Riis
- Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - M I Arce
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
| | - G Onandia
- Leibniz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany
| | - J R Paranaíba
- Biology Department, Federal University of Juiz de Fora, Minas Gerais, Brazil
| | - A Linkhorst
- Department of Ecology and Genetics, Limnology, Uppsala University, Uppsala, Sweden
| | - R Del Campo
- Department of Ecology, University of Innsbruck, Innsbruck, Austria
- Department of Ecology and Hydrology, University of Murcia, Murcia, Spain
| | - A M Amado
- Biology Department, Federal University of Juiz de Fora, Minas Gerais, Brazil
- Departamento de Oceanografia e Limnologia, Universidade Federal do Rio Grande do Norte, Natal, Brazil
| | - S Cauvy-Fraunié
- INRAE, UR RiverLy, Centre de Lyon-Villeurbanne, Villeurbanne, France
| | - S Brothers
- Department of Watershed Sciences and Ecology Center, Utah State University, Logan, UT, USA
| | - J Condon
- Graham Centre for Agricultural Innovation, Charles Sturt University and New South Wales Department of Primary Industries, Wagga Wagga, NSW, Australia
| | - R F Mendonça
- Biology Department, Federal University of Juiz de Fora, Minas Gerais, Brazil
| | - F Reverey
- Leibniz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany
| | - E-I Rõõm
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, Estonia
| | - T Datry
- INRAE, UR RiverLy, Centre de Lyon-Villeurbanne, Villeurbanne, France
| | - F Roland
- Biology Department, Federal University of Juiz de Fora, Minas Gerais, Brazil
| | - A Laas
- Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, Estonia
| | - U Obertegger
- Department of Sustainable Agro-ecosystems and Bioresources, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - J-H Park
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul, Republic of Korea
| | - H Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - S Kosten
- Department of Aquatic Ecology and Environmental Biology, Institute for Water and Wetland Research, Radboud University, Nijmegen, the Netherlands
| | - R Gómez
- Department of Ecology and Hydrology, University of Murcia, Murcia, Spain
| | - C Feijoó
- Programa Biogeoquímica de Ecosistemas Dulceacuícolas (BED), Instituto de Ecología y Desarrollo Sustentable (INEDES, CONICET-UNLu), Luján, Argentina
| | - A Elosegi
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | | | - C M Finlayson
- Institute for Land, Water and Society, Charles Sturt University, Albury, Australia
- IHE Delft, Institite for Water Education, Delft, the Netherlands
| | - M Melita
- Water Research Institute-National Research Council (IRSA-CNR), Montelibretti (Rome), Italy
| | - E S Oliveira Junior
- Department of Aquatic Ecology and Environmental Biology, Institute for Water and Wetland Research, Radboud University, Nijmegen, the Netherlands
- Center of Etnoecology, Limnology and Biodiversity, Laboratory of Ichthyology of the Pantanal North, University of the State of Mato Grosso, Cáceres, Brazil
| | - C C Muniz
- Center of Etnoecology, Limnology and Biodiversity, Laboratory of Ichthyology of the Pantanal North, University of the State of Mato Grosso, Cáceres, Brazil
| | - L Gómez-Gener
- Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden
| | - C Leigh
- Australian Rivers Institute, Griffith University, Nathan, QLD, Australia
- Institute for Future Environments and School of Mathematical Sciences, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- ARC Centre of Excellence for Mathematical & Statistical Frontiers (ACEMS), Brisbane, QLD, Australia
- Biosciences and Food Technology Discipline, School of Science, RMIT University, Bundoora, VIC, Australia
| | - Q Zhang
- Nanjing Institute of Geography & Limnology (NIGLAS), Chinese Academy of Sciences, Nanjing, China
| | - R Marcé
- Catalan Institute for Water Research (ICRA), Girona, Spain
- Universitat de Girona, Girona, Spain
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7
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Iversen LL, Winkel A, Baastrup-Spohr L, Hinke AB, Alahuhta J, Baattrup-Pedersen A, Birk S, Brodersen P, Chambers PA, Ecke F, Feldmann T, Gebler D, Heino J, Jespersen TS, Moe SJ, Riis T, Sass L, Vestergaard O, Maberly SC, Sand-Jensen K, Pedersen O. Catchment properties and the photosynthetic trait composition of freshwater plant communities. Science 2019; 366:878-881. [DOI: 10.1126/science.aay5945] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 10/15/2019] [Indexed: 01/31/2023]
Abstract
Unlike in land plants, photosynthesis in many aquatic plants relies on bicarbonate in addition to carbon dioxide (CO2) to compensate for the low diffusivity and potential depletion of CO2 in water. Concentrations of bicarbonate and CO2 vary greatly with catchment geology. In this study, we investigate whether there is a link between these concentrations and the frequency of freshwater plants possessing the bicarbonate use trait. We show, globally, that the frequency of plant species with this trait increases with bicarbonate concentration. Regionally, however, the frequency of bicarbonate use is reduced at sites where the CO2 concentration is substantially above the air equilibrium, consistent with this trait being an adaptation to carbon limitation. Future anthropogenic changes of bicarbonate and CO2 concentrations may alter the species compositions of freshwater plant communities.
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Affiliation(s)
- L. L. Iversen
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - A. Winkel
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - L. Baastrup-Spohr
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - A. B. Hinke
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - J. Alahuhta
- Geography Research Unit, University of Oulu, Oulu, Finland
- Finnish Environment Institute, Helsinki, Finland
| | | | - S. Birk
- Aquatic Ecology, Universität Duisburg-Essen, Duisburg, Germany
| | - P. Brodersen
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - P. A. Chambers
- Environment and Climate Change Canada, Ottawa, ON, Canada
| | - F. Ecke
- Department of Wildlife, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - T. Feldmann
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, Estonia
| | - D. Gebler
- Department of Ecology and Environment, Poznán University of Life Sciences, Poznan, Poland
| | - J. Heino
- Finnish Environment Institute, Helsinki, Finland
| | - T. S. Jespersen
- Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
| | - S. J. Moe
- Norwegian Institute for Water Research, Oslo, Norway
| | - T. Riis
- Department of Bioscience, Aarhus University, Aarhus, Denmark
| | - L. Sass
- Prairie Research Institute, University of Illinois, Champaign, IL, USA
| | | | - S. C. Maberly
- Centre for Ecology & Hydrology, Bailrigg, Lancaster, UK
| | - K. Sand-Jensen
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - O. Pedersen
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
- School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia
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8
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Riis T, Olesen A, Jensen SM, Alnoee AB, Baattrup-Pedersen A, Lauridsen TL, Sorrell BK. Submerged freshwater plant communities do not show species complementarity effect in wetland mesocosms. Biol Lett 2019; 14:20180635. [PMID: 30958246 DOI: 10.1098/rsbl.2018.0635] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
It is a generally accepted theory that ecological functions are enhanced with increased diversity in plant communities due to species complementarity effects. We tested this theory in a mesocosm study using freshwater submerged plant beds to determine if increasing species number caused overyielding and species complementarity. We applied a maximum of four species in the plant beds corresponding to the typical species number in natural freshwater plant beds. We found no clear effects of species number (1-4) on biomass production and thus no conclusive overyielding and complementarity effect. This may be explained by low species differentiation among the four species in plant traits relevant for resource acquisition in freshwater, or that other species interactions, e.g. allelopathy, were inhibiting overyielding. The existing knowledge on species complementarity in aquatic plant communities is sparse and inconclusive and calls for more research.
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Affiliation(s)
- T Riis
- 1 Department of Bioscience, Aarhus Universitet , Ole Worms Alle 1, Aarhus 8000 , Denmark
| | - A Olesen
- 1 Department of Bioscience, Aarhus Universitet , Ole Worms Alle 1, Aarhus 8000 , Denmark
| | - S M Jensen
- 1 Department of Bioscience, Aarhus Universitet , Ole Worms Alle 1, Aarhus 8000 , Denmark
| | - A B Alnoee
- 1 Department of Bioscience, Aarhus Universitet , Ole Worms Alle 1, Aarhus 8000 , Denmark
| | - A Baattrup-Pedersen
- 2 Department of Bioscience, Aarhus University , Vejlsoevej 25, 8600 Silkeborg , Denmark
| | - T L Lauridsen
- 2 Department of Bioscience, Aarhus University , Vejlsoevej 25, 8600 Silkeborg , Denmark
| | - B K Sorrell
- 1 Department of Bioscience, Aarhus Universitet , Ole Worms Alle 1, Aarhus 8000 , Denmark
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Kornholt J, Sonne DP, Riis T, Sonne J, Klarskov N. Effect of imipramine on urethral opening pressure: A randomized, double‐blind, placebo‐controlled crossover study in healthy women. Neurourol Urodyn 2019; 38:1076-1080. [DOI: 10.1002/nau.23955] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 02/15/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Jonatan Kornholt
- Department of Clinical PharmacologyUniversity Hospital Bispebjerg and FrederiksbergCopenhagen Denmark
| | - David Peick Sonne
- Department of Clinical PharmacologyUniversity Hospital Bispebjerg and FrederiksbergCopenhagen Denmark
| | - Troels Riis
- Department of Clinical PharmacologyUniversity Hospital Bispebjerg and FrederiksbergCopenhagen Denmark
| | - Jesper Sonne
- Department of Clinical PharmacologyUniversity Hospital Bispebjerg and FrederiksbergCopenhagen Denmark
| | - Niels Klarskov
- Department of Gynecology and ObstetricsHerlev and Gentofte HospitalHerlev Denmark
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10
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Gade C, Dalhoff K, Petersen T, Riis T, Schmeltz C, Chabanova E, Christensen HR, Mikus G, Burhenne J, Holm JC, Holst H. Obesity-induced CYP2E1 activity in children. Br J Clin Pharmacol 2018; 85:458-459. [PMID: 30537026 DOI: 10.1111/bcp.13813] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 11/01/2018] [Accepted: 11/03/2018] [Indexed: 11/27/2022] Open
Affiliation(s)
- Christina Gade
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - Kim Dalhoff
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - Tonny Petersen
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - Troels Riis
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - Camilla Schmeltz
- The Children's Obesity Clinic, Department of Paediatrics, Copenhagen University Hospital Holbaek, Denmark
| | - Elizaveta Chabanova
- Department of Radiology, Copenhagen University Hospital, Herlev and Gentofte, Denmark
| | - Hanne Rolighed Christensen
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - Gerd Mikus
- Department of Clinical Pharmacology and Pharmacoepidemiology, University of Heidelberg, Germany
| | - Juergen Burhenne
- Department of Clinical Pharmacology and Pharmacoepidemiology, University of Heidelberg, Germany
| | - Jens Christian Holm
- The Children's Obesity Clinic, Department of Paediatrics, Copenhagen University Hospital Holbaek, Denmark.,Novo Nordisk Foundation Centre for Basic Metabolic Research, Denmark
| | - Helle Holst
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
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Schmiegelow MT, Sode N, Riis T, Lauritzen JB, Duus BR, Lindberg-Larsen M. Re-amputations and mortality after below-knee, through-knee and above-knee amputations. Dan Med J 2018; 65:A5520. [PMID: 30511636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
INTRODUCTION From January 2013, we changed the surgical strategy in our department and ceased to perform the through-knee amputation (TKA). The primary aim of this study was to investigate re-amputation rates ≤ 90 days after non-traumatic major lower-extremity amputations performed before and after this change of practice. Furthermore, we reported mortality before and after the change of practice. METHODS All non-traumatic major lower-extremity amputations performed in a single centre in two study periods (before and after the change of practice); 2009-2012 (cohort A) and 2014-2015 (cohort B) were included. Re-amputations and all-cause mortality ≤ 90 days after the index amputations were analysed. RESULTS Cohort A: Included 180 amputations with 27 below-knee amputations (BKA), 68 TKAs and 85 above-knee amputations (AKA). 86.7% of patients were American Society of Anesthesiologists (ASA) score 3-5. The re-amputation rate ≤ 90 days was 29.6% (95% confidence interval (CI): 12.7-47.3%) after BKA, 33.8% (95% CI: 22.7-45.3%) after TKA, 9.4% (95% CI: 2.9-15.1%) after AKA and 21.6% (95% CI: 15.6-27.6%) overall. The overall mortality ≤ 90 days was 35.2% (95% CI: 26.2-44.2%). Cohort B: Included 116 amputations with 21 BKA and 95 AKA. 92.7% of patients were ASA score 3-5. The re-amputation rate ≤ 90 days was 19.1% (95% CI: 7.7-40.0%) after BKA, 2.1% (95% CI: 0.6-7.4%) after AKA and 5.2% (95% CI: 2.4-10.8%) overall. The overall mortality ≤ 90 days was 32.8% (95% CI: 26.2-44.2%). CONCLUSIONS The overall re-amputation rate ≤ 90 days following major lower-extremity amputation decreased significantly from 22% to 5% after cessation of the TKA procedures, but mortality remained unchanged. FUNDING none. TRIAL REGISTRATION not relevant.
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Gade C, Dalhoff K, Petersen TS, Riis T, Schmeltz C, Chabanova E, Christensen HR, Mikus G, Burhenne J, Holm JC, Holst H. Higher chlorzoxazone clearance in obese children compared with nonobese peers. Br J Clin Pharmacol 2018; 84:1738-1747. [PMID: 29618168 DOI: 10.1111/bcp.13602] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 03/20/2018] [Accepted: 03/26/2018] [Indexed: 12/21/2022] Open
Abstract
AIMS To test the in vivo activity of Cytochrome P450 (CYP) 2E1 in obese children vs. nonobese children, aged 11-18 years. Secondly, whether the activity of CYP2E1 in these patients is associated with NALFD, diabetes or hyperlipidaemia. METHODS Seventy children were divided into groups by body mass index (BMI) standard deviation score (SDS). All children received 250 mg oral chlorzoxazone (CLZ) as probe for CYP2E1 activity. Thirteen blood samples and 20-h urine samples were collected per participant. RESULTS Obese children had an increased oral clearance and distribution of CLZ, indicating increased CYP2E1 activity, similar to obese adults. The mean AUC0-∞ value of CLZ was decreased by 46% in obese children compared to nonobese children. The F was was increased twofold in obese children compared to nonobese children, P < 0.0001. Diabetic biomarkers were significantly increased in obese children, while fasting blood glucose and Hba1c levels were nonsignificant between groups. Liver fat content was not associated with CLZ Cl. CONCLUSION Oral clearance of CLZ was increased two-fold in obese children vs. nonobese children aged 11-18 years. This indicates an increased CYP2E1 activity of clinical importance, and dose adjustment should be considered for CLZ.
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Affiliation(s)
- C Gade
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - K Dalhoff
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - T S Petersen
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - T Riis
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - C Schmeltz
- Children's Obesity Clinic, European Center of Management (EASO). Department of Pediatrics, Zealand University Hospital, Holbaek, Denmark
| | - E Chabanova
- Faculty of Health and Medical Sciences, Copenhagen University, Department of Radiology, Herlev and Gentofte Hospital, Denmark
| | - H R Christensen
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | - G Mikus
- Department of Clinical Pharmacology and Pharmacoepidemiology, University of Heidelberg, Germany
| | - J Burhenne
- Department of Clinical Pharmacology and Pharmacoepidemiology, University of Heidelberg, Germany
| | - J C Holm
- The Children's Obesity Clinic, Department of Paediatrics, Copenhagen University Hospital Holbaek, Denmark.,Novo Nordisk Foundation Centre for Basic Metabolic Research, Denmark.,Department of Clinical Medicine, University of Copenhagen, Denmark
| | - H Holst
- Department of Clinical Pharmacology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
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13
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Tank JL, Martí E, Riis T, Schiller D, Reisinger AJ, Dodds WK, Whiles MR, Ashkenas LR, Bowden WB, Collins SM, Crenshaw CL, Crowl TA, Griffiths NA, Grimm NB, Hamilton SK, Johnson SL, McDowell WH, Norman BM, Rosi EJ, Simon KS, Thomas SA, Webster JR. Partitioning assimilatory nitrogen uptake in streams: an analysis of stable isotope tracer additions across continents. ECOL MONOGR 2017. [DOI: 10.1002/ecm.1280] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- J. L. Tank
- Department of Biological Sciences University of Notre Dame Notre Dame Indiana 46656 USA
| | - E. Martí
- Integrative Freshwater Ecology Group Centre d'Estudis Avançats de Blanes (CEAB‐CSIC) 17300 Blanes Catalonia Spain
| | - T. Riis
- Department of Bioscience Aarhus University Ole Worms Alle 1 8000 Aarhus C Denmark
| | - D. Schiller
- Faculty of Science and Technology University of the Basque Country 48080 Bilbao Spain
| | - A. J. Reisinger
- Cary Institute of Ecosystem Studies Millbrook New York 12545 USA
| | - W. K. Dodds
- Division of Biology Kansas State University 106 Ackert Hall Manhattan Kansas 66506 USA
| | - M. R. Whiles
- Department of Zoology and Center for Ecology Southern Illinois University Carbondale Illinois 62901 USA
| | - L. R. Ashkenas
- Department of Fisheries & Wildlife Oregon State University Corvallis Oregon 97331 USA
| | - W. B. Bowden
- Rubenstein School of Environment and Natural Resources University of Vermont 303D Aiken Center Burlington Vermont 05405 USA
| | - S. M. Collins
- Center for Limnology University of Wisconsin Madison Wisconsin 53706 USA
| | - C. L. Crenshaw
- Department of Biology University of New Mexico Albuquerque New Mexico 87131 USA
| | - T. A. Crowl
- Department of Biology Southeast Environmental Research Center Florida International University Miami Florida 33199 USA
| | - N. A. Griffiths
- Climate Change Science Institute and Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA
| | - N. B. Grimm
- School of Life Sciences Arizona State University Tempe Arizona 85287 USA
| | - S. K. Hamilton
- W. K. Kellogg Biological Station Michigan State University Hickory Corners Michigan 49060 USA
| | - S. L. Johnson
- Pacific Northwest Research Station USDA Forest Service 3200 SW Jefferson Way Corvallis Oregon 97331 USA
| | - W. H. McDowell
- Natural Resources and the Environment University of New Hampshire Durham New Hampshire 03824 USA
| | - B. M. Norman
- Department of Microbiology and Molecular Genetics Michigan State University East Lansing Michigan 48824 USA
| | - E. J. Rosi
- Cary Institute of Ecosystem Studies Millbrook New York 12545 USA
| | - K. S. Simon
- School of Environment University of Auckland P.O. Box 92019 Auckland 1142 New Zealand
| | - S. A. Thomas
- School of Natural Resources University of Nebraska 403 Hardin Hall Lincoln Nebraska 68583 USA
| | - J. R. Webster
- Department of Biological Sciences Virginia Tech 1405 Perry Street Blacksburg Virginia 24601 USA
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14
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Norring-Agerskov D, Madsen CM, Abrahamsen B, Riis T, Pedersen OB, Jørgensen NR, Bathum L, Lauritzen JB, Jørgensen HL. Hyperkalemia is Associated with Increased 30-Day Mortality in Hip Fracture Patients. Calcif Tissue Int 2017; 101:9-16. [PMID: 28213863 DOI: 10.1007/s00223-017-0252-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 02/02/2017] [Indexed: 10/20/2022]
Abstract
Abnormal plasma concentrations of potassium in the form of hyper- and hypokalemia are frequent among hospitalized patients and have been linked to poor outcomes. In this study, we examined the prevalence of hypo- and hyperkalemia in patients admitted with a fractured hip as well as the association with 30-day mortality in these patients. A total of 7293 hip fracture patients (aged 60 years or above) with admission plasma potassium measurements were included. Data on comorbidity, medication, and death was retrieved from national registries. The association between plasma potassium and mortality was examined using Cox proportional hazards models adjusted for age, sex, and comorbidities. The prevalence of hypo- and hyperkalemia on admission was 19.8% and 6.6%, respectively. The 30-day mortality rates were increased for patients with hyperkalemia (21.0%, p < 0.0001) compared to normokalemic patients (9.5%), whereas hypokalemia was not significantly associated with mortality. After adjustment for age, sex, and individual comorbidities, hyperkalemia was still associated with increased risk of death 30 days after admission (HR = 1.93 [1.55-2.40], p < 0.0001). After the same adjustments, hypokalemia remained non-associated with increased risk of 30-day mortality (HR = 1.06 [0.87-1.29], p = 0.6). Hyperkalemia, but not hypokalemia, at admission is associated with increased 30-day mortality after a hip fracture.
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Affiliation(s)
- Debbie Norring-Agerskov
- Department of Clinical Biochemistry, Hvidovre Hospital, University of Copenhagen, Kettegård Alle 30, 2650, Hvidovre, Denmark.
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Bispebjerg Bakke 23, 2400, Copenhagen NV, Denmark.
| | - Christian Medom Madsen
- Department of Clinical Biochemistry, Herlev Hospital, University of Copenhagen, Herlev Ringvej 75, 2730, Herlev, Denmark
| | - Bo Abrahamsen
- Department of Medicine, Holbæk Sygehus, Smedelundsgade 60, 4300, Holbæk, Denmark
- Odense Patient Data Explorative Network, University of Southern Denmark, J.B. Winsløws Vej 9A, 5000, Odense, Denmark
| | - Troels Riis
- DanTrials ApS, Bispebjerg Hospital, University of Copenhagen, Bispebjerg Bakke 23, 2400, Kbh NV, Denmark
| | - Ole B Pedersen
- Department of Clinical Immunology, Næstved Sygehus, Ringstedgade 61, 4700, Næstved, Denmark
| | - Niklas Rye Jørgensen
- Odense Patient Data Explorative Network, University of Southern Denmark, J.B. Winsløws Vej 9A, 5000, Odense, Denmark
- Department of Clinical Biochemistry, Rigshospitalet Glostrup, University of Copenhagen, Nordre Ringvej 57, 2600, Glostrup, Denmark
| | - Lise Bathum
- Department of Clinical Biochemistry, Hvidovre Hospital, University of Copenhagen, Kettegård Alle 30, 2650, Hvidovre, Denmark
| | - Jes Bruun Lauritzen
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Bispebjerg Bakke 23, 2400, Copenhagen NV, Denmark
| | - Henrik L Jørgensen
- Department of Clinical Biochemistry, Bispebjerg Hospital, University of Copenhagen, Bispebjerg Bakke 23, 2400, Copenhagen NV, Denmark
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Abstract
Introduction: Orthogeriatric service has been shown to improve outcomes in patients with hip fracture. The purpose of this study is to evaluate the effect of orthogeriatrics at Bispebjerg University Hospital, Denmark. The primary outcome is mortality inhospital and after 1, 3, and 12 months for patients with hip fracture. The secondary outcome is mortality for home dwellers and nursing home inhabitants. Materials and Methods: This is a retrospective clinical cohort study with an historic control group including all patients with hip fracture admitted from 2007 to 2011. Patients with hip fracture are registered in a local database, and data are retrieved retrospectively using the Danish Civil Registration Number. Results: We included 993 patients in the intervention group and 989 patients in the control group. A univariate analysis showed only significantly decreased mortality inhospital 6.3% vs 3.1% (P = .009) after orthogeriatrics. However, when adjusting for age, gender, and American Society of Anaesthesiologists (ASA) score in a multivariate analysis, including all patients with hip fracture, we find significantly reduced mortality inhospital (odds ratio [OR] 0.35), after 30 [OR 0.66] and 90 days [OR 0.72] and 1 year [OR 0.79]). When using a univariate analysis for home-dwelling patients, we found significantly reduced mortality inhospital (8.3-2.0%, P < .0001), after 30 days (12.2-6.8%, P = .004) and 90 days (20.5-13.0%, P = .002). One-year mortality was not significant. Patients from nursing homes had no significant decreasing mortality at any point of time in the univariate analysis. Conclusion: We have shown significant decreases for inhospital, 30 day, 90 day, and 1-year mortality after implementation of orthogeriatric service at Bispebjerg Hospital when adjusting for age, gender, and ASA score. Future trials should include frail patients with other fracture types who can benefit from orthogeriatrics.
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Affiliation(s)
- Charlotte Stenqvist
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Christian Medom Madsen
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Troels Riis
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | | | - Benn Rønnow Duus
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Jes Bruun Lauritzen
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Susanne van der Mark
- Department of Orthopedic Surgery, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
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Cavalli G, Baattrup-Pedersen A, Riis T. Nutrient availability and nutrient use efficiency in plants growing in the transition zone between land and water. Plant Biol (Stuttg) 2016; 18:301-306. [PMID: 26414531 DOI: 10.1111/plb.12397] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 09/18/2015] [Indexed: 06/05/2023]
Abstract
The transition zone between terrestrial and freshwater habitats is highly dynamic, with large variability in environmental characteristics. Here, we investigate how these characteristics influence the nutritional status and performance of plant life forms inhabiting this zone. Specifically, we hypothesised that: (i) tissue nutrient content differs among submerged, amphibious and terrestrial species, with higher content in submerged species; and (ii) PNUE gradually increases from submerged over amphibious to terrestrial species, reflecting differences in the availability of N and P relative to inorganic C across the land-water ecotone. We found that tissue nutrient content was generally higher in submerged species and C:N and C:P ratios indicated that content was limiting for growth for ca. 20% of plant individuals, particularly those belonging to amphibious and terrestrial species groups. As predicted, the PNUE increased from submerged over amphibious to terrestrial species. We suggest that this pattern reflects that amphibious and terrestrial species allocate proportionally more nutrients into processes of importance for photosynthesis at saturating CO2 availability, i.e. enzymes involved in substrate regeneration, compared to submerged species that are acclimated to lower availability of CO2 in the aquatic environment. Our results indicate that enhanced nutrient loading may affect relative abundance of the three species groups in the land-water ecotone of stream ecosystems. Thus, species of amphibious and terrestrial species groups are likely to benefit more from enhanced nutrient availability in terms of faster growth compared to aquatic species, and that this can be detrimental to aquatic species growing in the land-water ecotone, e.g. Ranunculus and Callitriche.
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Affiliation(s)
- G Cavalli
- Department of Bioscience, Aarhus University, Aarhus, Denmark
| | | | - T Riis
- Department of Bioscience, Aarhus University, Aarhus, Denmark
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17
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Dodds WK, Collins SM, Hamilton SK, Tank JL, Johnson S, Webster JR, Simon KS, Whiles MR, Rantala HM, McDowell WH, Peterson SD, Riis T, Crenshaw CL, Thomas SA, Kristensen PB, Cheever BM, Flecker AS, Griffiths NA, Crowl T, Rosi-Marshall EJ, El-Sabaawi R, Martí E. You are not always what we think you eat: selective assimilation across multiple whole-stream isotopic tracer studies. Ecology 2014. [DOI: 10.1890/13-2276.1] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Jantzen C, Jørgensen HL, Thomsen MT, Riis T, Sommer B, Duus BR, Lauritzen JB. Daily number of fractures is associated with road temperature in an urban area. Dan Med J 2014; 61:A4794. [PMID: 24814914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
INTRODUCTION Different factors related to winter are known to influence the fracture incidence, but little is known about the effect of road surface temperature. This study examines the association between road surface temperature and the daily number of fractures in an urban area during two winters. MATERIAL AND METHODS Retrospective data collection was conducted on all patients treated at Bispebjerg Hospital, Denmark, for a humeral, ankle, distal radius or hip fracture during the periods October to April 2009/2010 and 2010/2011. Patients were grouped according to age into the following categories: < 15, 15-30, 30-45, 45-60 and > 60 years. Data on road surface temperature (Tp.) were obtained from The Danish Road Directorate and grouped into the following categories: Days with Tp. > 0 °C, Tp. < 0 °C, Tp. > -5 °C, Tp. < -5 °C and ice alert (IA). RESULTS A total of 4,892 patients (4,938 fractures) were treated during the study periods. The daily number of distal radius, humeral and ankle fractures increased significantly with decreasing road surface temperature and the presence of IA. For hip fractures no significant association was found. Decreasing temperature was associated with a significant decrease in the daily number of fractures for patients < 15 years, whereas patients > 30 years experienced a significant increase. CONCLUSION Decreasing road temperature results in increased numbers of all fractures except hip fractures. Low temperatures is a risk factor for patients > 30 years and a protective factor for patients < 15 years. FUNDING not relevant. TRIAL REGISTRATION not relevant.
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Affiliation(s)
- Christopher Jantzen
- Ortopædkirurgisk Afdeling, Bispebjerg Hospital, Bispebjerg Bakke 23, 2400 Copenhagen NV, Denmark.
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Daugaard CL, Jørgensen HL, Riis T, Lauritzen JB, Duus BR, van Mark S. Is mortality after hip fracture associated with surgical delay or admission during weekends and public holidays? A retrospective study of 38,020 patients. Acta Orthop 2012; 83:609-13. [PMID: 23140106 PMCID: PMC3555458 DOI: 10.3109/17453674.2012.747926] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND AND PURPOSE Hip fractures are associated with high mortality, but the cause of this is still not entirely clear. We investigated the effect of surgical delay, weekends, holidays, and time of day admission on mortality in hip fracture patients. PATIENTS AND METHODS Using data from the Danish National Indicator Project, we identified 38,020 patients admitted from 2003 to 2010. Logistic regression analysis was used to study the association between sex, age, weekend or holiday admission, night-time admission, time to surgery, and ASA score on the one hand and mortality on the other. RESULTS The risk of death in hospital increased with surgical delay (odds ratio (OR) = 1.3 per 24 h of delay), ASA score (OR (per point added) = 2.3), sex (OR for men 2.2), and age (OR (per 5 years) = 1.4). The mortality rate for patients admitted during weekends or public holidays, or at night, was similar to that found for those admitted during working days. INTERPRETATION Minimizing surgical delay is the most important factor in reducing mortality in hip fracture patients.
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Affiliation(s)
| | - Henrik L Jørgensen
- Department of Clinical Biochemistry, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
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20
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Madsen CM, Jørgensen HL, Lind B, Ogarrio HW, Riis T, Schwarz P, Duus BR, Lauritzen JB. Secondary hyperparathyroidism and mortality in hip fracture patients compared to a control group from general practice. Injury 2012; 43:1052-7. [PMID: 22261083 DOI: 10.1016/j.injury.2011.12.025] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2011] [Revised: 12/23/2011] [Accepted: 12/23/2011] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Previously, little attention has been paid as to how disturbances in the parathyroid hormone (PTH)-calcium-vitamin D-axis, such as secondary hyperparathyroidism (SHPT), relate to mortality amongst hip fracture patients. This study aimed to (1) determine if SHPT is associated with mortality in this group of patients, (2) investigate the association between serum (s-) PTH, s-total calcium, s-25-hydroxyvitamin D (s-25(OH)D) and mortality and (3) determine the prevalence of SHPT amongst hip fracture patients and a control group. METHOD The study included 562 hip fracture patients (HF) (age ≥ 70 years) admitted to a Danish university hospital. The hip fracture patients were prospectively enrolled in a dedicated hip fracture database. Each hip fracture patient was exactly matched according to age and sex with two controls randomly chosen from a control population of 21,778 subjects who had s-PTH, s-total calcium and s-25(OH)D measured at the Copenhagen General Practitioners Laboratory after referral from their general practitioner. The control group (Con) thus consisted of 1124 subjects. RESULTS General 1-year mortality: Con-female 8.4%, Con-male 15.3%, HF-female 24.6%, HF-male 33.3%, p<0.0001 (log rank). SHPT AND RELATED 1-YEAR MORTALITY: Con-no SHPT 8.9%, Con-SHPT 16.8%, HF-no SHPT 22.7%, HF-SHPT 34.9%, p<0.0001 (log rank). The mortality rates were higher for controls with SHPT (OR 2.06, 95% CI: 1.32-3.23), hip fracture patients without SHPT (OR 3.00, 95% CI: 2.14-4.20) and hip fracture patients with SHPT (OR 5.46, 95% CI: 3.32-8.97) compared to the controls without SHPT. PREVALENCE OF SHPT: Con 16%, HF 20%, p=0.09 (Chi-square). CONCLUSIONS Our study clearly shows that SHPT is significantly associated with mortality in both hip fracture patients and the control group. In the multivariate Cox regression analysis, s-PTH and s-total calcium were both significantly associated with mortality, whereas s-25(OH)D was not associated with mortality in this analysis. Our study furthermore indicates that SHPT is almost equally prevalent amongst the hip fracture patients and the control group.
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Mosfeldt M, Pedersen OB, Riis T, Worm HO, van Mark S, Jørgensen HL, Duus BR, Lauritzen JB. Value of routine blood tests for prediction of mortality risk in hip fracture patients. Acta Orthop 2012; 83:31-5. [PMID: 22248167 PMCID: PMC3278654 DOI: 10.3109/17453674.2011.652883] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND There is a 5- to 8-fold increased risk of mortality during the first 3 months after a hip fracture. Several risk factors are known. We studied the predictive value (for mortality) of routine blood tests taken on admission. METHODS 792 hip fracture patients were included prospectively; blood tests were taken on admission. Follow-up data on mortality were obtained from the civil registration system. Patients were divided into 2 groups based on whether they had survived at least 90 days after the hip fracture. To estimate which laboratory tests could be used to predict outcome, we used receiver operation characteristic (ROC) curves. RESULTS 3-month mortality could be predicted with 69% accuracy from the level of plasma creatinine in standard admission blood tests. The mortality in patients with elevated levels of creatinine was almost 3-fold that of the patients with normal creatinine. Mortality was also associated with age, low blood hemoglobin, high plasma potassium, and low plasma albumin levels. INTERPRETATION Our findings could be of use in identifying patients who might benefit from increased attention perioperatively.
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Affiliation(s)
| | - Ole B Pedersen
- Tissue Typing Laboratory, Department of Clinical Immunology, Copenhagen University Hospital, Copenhagen, Denmark
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Affiliation(s)
- A. M. Suren
- National Institute of Water and Atmospheric Research Ltd, P.O. Box 8602, Riccarton, New Zealand
| | - T. Riis
- Department of Biological Sciences, Aarhus University, Ole Worms Allé, Building 1135, 8000 Århus C, Denmark
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Riis T. [Prescription errors]. Ugeskr Laeger 1975; 137:583-4. [PMID: 1135963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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