|
1
|
Cox I, Xu ZY, Grzywacz R, Ong WJ, Rasco BC, Kitamura N, Hoskins D, Neupane S, Ruland TJ, Allmond JM, King TT, Lubna RS, Rykaczewski KP, Schatz H, Sherrill BM, Tarasov OB, Ayangeakaa AD, Berg HC, Bleuel DL, Cerizza G, Christie J, Chester A, Davis J, Dembski C, Doetsch AA, Duarte JG, Estrade A, Fijałkowska A, Gray TJ, Good EC, Haak K, Hanai S, Harke JT, Harris C, Hermansen K, Hoff DEM, Jain R, Karny M, Kolos K, Laminack A, Liddick SN, Longfellow B, Lyons S, Madurga M, Mogannam MJ, Nowicki A, Ogunbeku TH, Owens-Fryar G, Rajabali MM, Richard AL, Ronning EK, Rose GE, Siegl K, Singh M, Spyrou A, Sweet A, Tsantiri A, Walters WB, Yokoyama R. Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator. Phys Rev Lett 2024; 132:152503. [PMID: 38682970 DOI: 10.1103/physrevlett.132.152503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/12/2023] [Accepted: 03/08/2024] [Indexed: 05/01/2024]
Abstract
The first complete measurement of the β-decay strength distribution of _{17}^{45}Cl_{28} was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in _{18}^{45}Ar_{27}. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.
Collapse
Affiliation(s)
- I Cox
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Z Y Xu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W-J Ong
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B C Rasco
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Kitamura
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Hoskins
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - S Neupane
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T J Ruland
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T T King
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R S Lubna
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H Schatz
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - B M Sherrill
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - O B Tarasov
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - A D Ayangeakaa
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA
| | - H C Berg
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D L Bleuel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Cerizza
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Christie
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - A Chester
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Davis
- Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - C Dembski
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A A Doetsch
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J G Duarte
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Estrade
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - A Fijałkowska
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - T J Gray
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E C Good
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Haak
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Hanai
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
| | - J T Harke
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Harris
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Hermansen
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D E M Hoff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Jain
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Karny
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - K Kolos
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Laminack
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S N Liddick
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - B Longfellow
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Lyons
- Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M J Mogannam
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Nowicki
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - T H Ogunbeku
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Owens-Fryar
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M M Rajabali
- Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - A L Richard
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E K Ronning
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - G E Rose
- University of California, Berkeley, Berkeley, California 94704, USA
| | - K Siegl
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Singh
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A Spyrou
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Sweet
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Tsantiri
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - W B Walters
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - R Yokoyama
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
| |
Collapse
|
|
2
|
Gray TJ, Allmond JM, Xu Z, King TT, Lubna RS, Crawford HL, Tripathi V, Crider BP, Grzywacz R, Liddick SN, Macchiavelli AO, Miyagi T, Poves A, Andalib A, Argo E, Benetti C, Bhattacharya S, Campbell CM, Carpenter MP, Chan J, Chester A, Christie J, Clark BR, Cox I, Doetsch AA, Dopfer J, Duarte JG, Fallon P, Frotscher A, Gaballah T, Harke JT, Heideman J, Huegen H, Holt JD, Jain R, Kitamura N, Kolos K, Kondev FG, Laminack A, Longfellow B, Luitel S, Madurga M, Mahajan R, Mogannam MJ, Morse C, Neupane S, Nowicki A, Ogunbeku TH, Ong WJ, Porzio C, Prokop CJ, Rasco BC, Ronning EK, Rubino E, Ruland TJ, Rykaczewski KP, Schaedig L, Seweryniak D, Siegl K, Singh M, Stuchbery AE, Tabor SL, Tang TL, Wheeler T, Winger JA, Wood JL. Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB. Phys Rev Lett 2023; 130:242501. [PMID: 37390416 DOI: 10.1103/physrevlett.130.242501] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 04/26/2023] [Indexed: 07/02/2023]
Abstract
Excited-state spectroscopy from the first experiment at the Facility for Rare Isotope Beams (FRIB) is reported. A 24(2)-μs isomer was observed with the FRIB Decay Station initiator (FDSi) through a cascade of 224- and 401-keV γ rays in coincidence with ^{32}Na nuclei. This is the only known microsecond isomer (1 μs≤T_{1/2}<1 ms) in the region. This nucleus is at the heart of the N=20 island of shape inversion and is at the crossroads of the spherical shell-model, deformed shell-model, and ab initio theories. It can be represented as the coupling of a proton hole and neutron particle to ^{32}Mg, ^{32}Mg+π^{-1}+ν^{+1}. This odd-odd coupling and isomer formation provides a sensitive measure of the underlying shape degrees of freedom of ^{32}Mg, where the onset of spherical-to-deformed shape inversion begins with a low-lying deformed 2^{+} state at 885 keV and a low-lying shape-coexisting 0_{2}^{+} state at 1058 keV. We suggest two possible explanations for the 625-keV isomer in ^{32}Na: a 6^{-} spherical shape isomer that decays by E2 or a 0^{+} deformed spin isomer that decays by M2. The present results and calculations are most consistent with the latter, indicating that the low-lying states are dominated by deformation.
Collapse
Affiliation(s)
- T J Gray
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Z Xu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - T T King
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R S Lubna
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - H L Crawford
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - V Tripathi
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - B P Crider
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - R Grzywacz
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - S N Liddick
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A O Macchiavelli
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Miyagi
- Department of Physics, Technische Universität Darmstadt, Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - A Poves
- Departamento de Fìsica Teórica and IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - A Andalib
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Argo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Benetti
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - S Bhattacharya
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - C M Campbell
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M P Carpenter
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Chan
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A Chester
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Christie
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - B R Clark
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - I Cox
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A A Doetsch
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Dopfer
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J G Duarte
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Fallon
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - A Frotscher
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - T Gaballah
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - J T Harke
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Heideman
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - H Huegen
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - J D Holt
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, McGill University, Montréal, Quebec City H3A 2T8, Canada
| | - R Jain
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - N Kitamura
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - K Kolos
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F G Kondev
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A Laminack
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B Longfellow
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Luitel
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - R Mahajan
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - M J Mogannam
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Morse
- National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - S Neupane
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A Nowicki
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - T H Ogunbeku
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - W-J Ong
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Porzio
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - C J Prokop
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - B C Rasco
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E K Ronning
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Rubino
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - T J Ruland
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - L Schaedig
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Seweryniak
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K Siegl
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - M Singh
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A E Stuchbery
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - S L Tabor
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - T L Tang
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - T Wheeler
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J A Winger
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - J L Wood
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA
| |
Collapse
|
|
3
|
Crawford HL, Tripathi V, Allmond JM, Crider BP, Grzywacz R, Liddick SN, Andalib A, Argo E, Benetti C, Bhattacharya S, Campbell CM, Carpenter MP, Chan J, Chester A, Christie J, Clark BR, Cox I, Doetsch AA, Dopfer J, Duarte JG, Fallon P, Frotscher A, Gaballah T, Gray TJ, Harke JT, Heideman J, Heugen H, Jain R, King TT, Kitamura N, Kolos K, Kondev FG, Laminack A, Longfellow B, Lubna RS, Luitel S, Madurga M, Mahajan R, Mogannam MJ, Morse C, Neupane S, Nowicki A, Ogunbeku TH, Ong WJ, Porzio C, Prokop CJ, Rasco BC, Ronning EK, Rubino E, Ruland TJ, Rykaczewski KP, Schaedig L, Seweryniak D, Siegl K, Singh M, Tabor SL, Tang TL, Wheeler T, Winger JA, Xu Z. Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB. Phys Rev Lett 2022; 129:212501. [PMID: 36461950 DOI: 10.1103/physrevlett.129.212501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/14/2022] [Indexed: 06/17/2023]
Abstract
New half-lives for exotic isotopes approaching the neutron drip-line in the vicinity of N∼28 for Z=12-15 were measured at the Facility for Rare Isotope Beams (FRIB) with the FRIB decay station initiator. The first experimental results are compared to the latest quasiparticle random phase approximation and shell-model calculations. Overall, the measured half-lives are consistent with the available theoretical descriptions and suggest a well-developed region of deformation below ^{48}Ca in the N=28 isotones. The erosion of the Z=14 subshell closure in Si is experimentally confirmed at N=28, and a reduction in the ^{38}Mg half-life is observed as compared with its isotopic neighbors, which does not seem to be predicted well based on the decay energy and deformation trends. This highlights the need for both additional data in this very exotic region, and for more advanced theoretical efforts.
Collapse
Affiliation(s)
- H L Crawford
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - V Tripathi
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B P Crider
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - S N Liddick
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Andalib
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Argo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Benetti
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - S Bhattacharya
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - C M Campbell
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M P Carpenter
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Chan
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A Chester
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Christie
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - B R Clark
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - I Cox
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A A Doetsch
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Dopfer
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J G Duarte
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Fallon
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - A Frotscher
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - T Gaballah
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - T J Gray
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J T Harke
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Heideman
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - H Heugen
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - R Jain
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - T T King
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Kitamura
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - K Kolos
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F G Kondev
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A Laminack
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B Longfellow
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R S Lubna
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Luitel
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - R Mahajan
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - M J Mogannam
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Morse
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - S Neupane
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A Nowicki
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - T H Ogunbeku
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - W-J Ong
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Porzio
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - C J Prokop
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - B C Rasco
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E K Ronning
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Rubino
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - T J Ruland
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - L Schaedig
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Seweryniak
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K Siegl
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - M Singh
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - S L Tabor
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - T L Tang
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - T Wheeler
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J A Winger
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - Z Xu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| |
Collapse
|
|
4
|
Patterson T, Clayton T, Dodd M, Khawaja Z, Morice MC, Wilson K, Kim WK, Meneveau N, Hambrecht R, Byrne J, Carrié D, Fraser D, Roberts DH, Doshi SN, Zaman A, Banning AP, Eltchaninoff H, Le Breton H, Smith D, Cox I, Frank D, Gershlick A, de Belder M, Thomas M, Hildick-Smith D, Prendergast B, Redwood S. ACTIVATION (PercutAneous Coronary inTervention prIor to transcatheter aortic VAlve implantaTION): A Randomized Clinical Trial. JACC Cardiovasc Interv 2021; 14:1965-1974. [PMID: 34556269 DOI: 10.1016/j.jcin.2021.06.041] [Citation(s) in RCA: 86] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 06/22/2021] [Accepted: 06/29/2021] [Indexed: 11/17/2022]
Abstract
OBJECTIVES This study sought to determine if percutaneous coronary intervention (PCI) prior to transcatheter aortic valve replacement (TAVR) in patients with significant coronary artery disease would produce noninferior clinical results when compared with no PCI (control arm). BACKGROUND PCI in patients undergoing TAVR is not without risk, and there are no randomized data to inform clinical practice. METHODS Patients with severe symptomatic aortic stenosis and significant coronary artery disease with Canadian Cardiovascular Society class ≤2 angina were randomly assigned to receive PCI or no PCI prior to TAVR. The primary endpoint was a composite of all-cause death or rehospitalization at 1 year. Noninferiority testing (prespecified margin of 7.5%) was performed in the intention-to-treat population. RESULTS At 17 centers, 235 patients underwent randomization. At 1 year, the primary composite endpoint occurred in 48 (41.5%) of the PCI arm and 47 (44.0%) of the no-PCI arm. The requirement for noninferiority was not met (difference: -2.5%; 1-sided upper 95% confidence limit: 8.5%; 1-sided noninferiority test P = 0.067). On analysis of the as-treated population, the difference was -3.7% (1-sided upper 95% confidence limit: 7.5%; P = 0.050). Mortality was 16 (13.4%) in the PCI arm and 14 (12.1%) in the no-PCI arm. At 1 year, there was no evidence of a difference in the rates of stroke, myocardial infarction, or acute kidney injury, with higher rates of any bleed in the PCI arm (P = 0.021). CONCLUSIONS Observed rates of death and rehospitalization at 1 year were similar between PCI and no PCI prior to TAVR; however, the noninferiority margin was not met, and PCI resulted in a higher incidence of bleeding. (Assessing the Effects of Stenting in Significant Coronary Artery Disease Prior to Transcatheter Aortic Valve Implantation; ISRCTN75836930).
Collapse
Affiliation(s)
- Tiffany Patterson
- Cardiovascular Department, St Thomas' Hospital, Kings College London, London, United Kingdom
| | - Tim Clayton
- Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Matthew Dodd
- Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Zeeshan Khawaja
- Cardiology Department, Lewisham and Greenwich NHS Foundation Trust, United Kingdom
| | - Marie Claude Morice
- Institut Cardiovasculaire Paris Sud, Massy, France; Cardiovascular European Research Center, Massy, France
| | - Karen Wilson
- Cardiovascular Department, St Thomas' Hospital, Kings College London, London, United Kingdom
| | - Won-Keun Kim
- Cardiology Department, Kerckhoff-Klinik Bad Nauheim Abteilung Kardiologie, Bad Nauheim, Germany
| | - Nicolas Meneveau
- Department of Cardiology, University Hospital Jean Minjoz, Besançon, France; EA3920, University of Burgundy Franche-Comté, Besançon, France
| | - Rainer Hambrecht
- Cardiology Department, Klinikum Links der Weser GmbH, Bremen, Germany
| | - Jonathan Byrne
- Cardiothoracic Department, King's College Hospital, London, United Kingdom
| | - Didier Carrié
- Cardiology Department, Hôpital Rangueil, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Doug Fraser
- Cardiology Department, Manchester Royal Infirmary, Manchester, United Kingdom
| | - David H Roberts
- Lancashire Cardiac Centre, Blackpool Victoria Hospital NHS Trust, Blackpool, United Kingdom
| | - Sagar N Doshi
- Cardiology Department, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Azfar Zaman
- Cardiology Department, Newcastle upon Tyne Hospitals NHS Foundation Trust of the Freeman Hospital, Newcastle, United Kingdom
| | - Adrian P Banning
- Department of Cardiology, John Radcliffe Hospital, Oxford, United Kingdom
| | - Hélène Eltchaninoff
- Cardiology Department, Hôpital Charles-Nicolle, Centre Hospitalier Universitaire de Rouen, Rouen, France
| | - Hervé Le Breton
- Service de Cardiologie, Hôpital Pontchaillou, Centre Hospitalier Universitaire de Rennes, Rennes, France
| | - David Smith
- Cardiology Department, Morriston Hospital, Swansea, United Kingdom
| | - Ian Cox
- Cardiology Department, Derriford Hospital, Plymouth, United Kingdom
| | - Derk Frank
- Cardiology Department, Oberarzt Facharzt für Innere Medizin und Kardiologie, Kiel, Germany
| | - Anthony Gershlick
- Department of Cardiovascular Sciences, Glenfield Hospital, University of Leicester, Leicester, United Kingdom
| | - Mark de Belder
- Cardiology Department, Barts Heart Centre, London, United Kingdom
| | | | - David Hildick-Smith
- Sussex Cardiac Centre, Brighton and Sussex University Hospitals, Brighton, United Kingdom
| | - Bernard Prendergast
- Cardiovascular Department, St Thomas' Hospital, Kings College London, London, United Kingdom
| | - Simon Redwood
- Cardiovascular Department, St Thomas' Hospital, Kings College London, London, United Kingdom.
| | | |
Collapse
|
|
5
|
Richdale K, Cox I, Kollbaum P, Bullimore MA, Bakaraju RC, Gifford P, Plainis S, McKenney C, Newman S, Tomiyama ES, Morgan PB. CLEAR – Contact lens optics. Cont Lens Anterior Eye 2021; 44:220-239. [DOI: 10.1016/j.clae.2021.02.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 02/01/2021] [Indexed: 12/27/2022]
|
|
6
|
Myat A, Mouy F, Buckner L, Cockburn J, Baumbach A, MacCarthy P, Banning AP, Curzen N, Hilling-Smith R, Blackman DJ, Mullen M, de Belder M, Cox I, Kovac J, Manoharan G, Zaman A, Muir D, Smith D, Brecker S, Turner M, Khogali S, Malik IS, Alsanjari O, D'Auria F, Redwood S, Prendergast B, Trivedi U, Robinson D, Ludman P, de Belder A, Hildick-Smith D. Survival relative to pacemaker status after transcatheter aortic valve implantation. Catheter Cardiovasc Interv 2021; 98:E444-E452. [PMID: 33502784 DOI: 10.1002/ccd.29498] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 01/08/2021] [Indexed: 11/08/2022]
Abstract
OBJECTIVES To determine whether a permanent pacemaker (PPM) in situ can enhance survival after transcatheter aortic valve implantation (TAVI), in a predominantly inoperable or high risk cohort. BACKGROUND New conduction disturbances are the most frequent complication of TAVI, often necessitating PPM implantation before hospital discharge. METHODS We performed an observational cohort analysis of the UK TAVI registry (2007-2015). Primary and secondary endpoints were 30-day post-discharge all-cause mortality and long-term survival, respectively. RESULTS Of 8,651 procedures, 6,815 complete datasets were analyzed. A PPM at hospital discharge, irrespective of when implantation occurred (PPM 1.68% [22/1309] vs. no PPM 1.47% [81/5506], odds ratio [OR] 1.14, 95% confidence interval [CI] 0.71-1.84; p = .58), or a PPM implanted peri- or post-TAVI only (PPM 1.44% [11/763] vs. no PPM 1.47% [81/5506], OR 0.98 [0.51-1.85]; p = .95) did not significantly reduce the primary endpoint. Patients with a PPM at discharge were older, male, had right bundle branch block at baseline, were more likely to have received a first-generation self-expandable prosthesis and had experienced more peri- and post-procedural complications including bailout valve-in-valve rescue, bleeding and acute kidney injury. A Cox proportional hazards model demonstrated significantly reduced long-term survival in all those with a PPM, irrespective of implantation timing (hazard ratio [HR] 1.14 [1.02-1.26]; p = .019) and those receiving a PPM only at the time of TAVI (HR 1.15 [1.02-1.31]; p = .032). The reasons underlying this observation warrant further investigation. CONCLUSIONS A PPM did not confer a survival advantage in the first 30 days after hospital discharge following TAVI.
Collapse
Affiliation(s)
- Aung Myat
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK.,Division of Clinical and Experimental Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - Florence Mouy
- Division of Clinical and Experimental Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - Luke Buckner
- Division of Clinical and Experimental Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - James Cockburn
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Andreas Baumbach
- William Harvey Research Institute, Queen Mary University of London, London, UK.,Barts Heart Center, Barts Health NHS Trust, London, UK.,Section of Cardiology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Philip MacCarthy
- Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Adrian P Banning
- Oxford Heart Center, Oxford University Hospitals NHS Trust, Oxford, UK
| | - Nick Curzen
- Department of Cardiology, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Roland Hilling-Smith
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Daniel J Blackman
- Yorkshire Heart Centre, The Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | | | - Mark de Belder
- Barts Heart Center, Barts Health NHS Trust, London, UK.,Department of Cardiology, The James Cook University Hospital, Middlesbrough, UK
| | - Ian Cox
- Department of Cardiology, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - Jan Kovac
- Glenfield Hospital, University of Leicester, Leicester, UK
| | - Ganesh Manoharan
- Royal Victoria Hospital, Belfast Health and Social Care Trust, Belfast, UK
| | - Azfar Zaman
- Institute of Cellular Medicine, Newcastle University, Newcastle, UK
| | - Douglas Muir
- Department of Cardiology, The James Cook University Hospital, Middlesbrough, UK
| | - David Smith
- Department of Cardiology, Morriston Hospital, Swansea, UK
| | - Stephen Brecker
- Cardiology Clinical Academic Group, St. George's University of London, London, UK
| | | | - Saib Khogali
- Heart and Lung Center, New Cross Hospital, Wolverhampton, UK
| | - Iqbal S Malik
- Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Osama Alsanjari
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Francesca D'Auria
- Azienda Ospedaliera Universitaria Maggiore della Carita, Novara, Italy
| | - Simon Redwood
- Cardiothoracic Directorate, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Bernard Prendergast
- Cardiothoracic Directorate, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Uday Trivedi
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Derek Robinson
- Department of Mathematics, University of Sussex, Brighton, UK
| | - Peter Ludman
- Cardiology Department, Queen Elizabeth Hospital, Birmingham, UK
| | - Adam de Belder
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - David Hildick-Smith
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| |
Collapse
|
|
7
|
Myat A, Buckner L, Mouy F, Cockburn J, Baumbach A, Banning AP, Blackman DJ, Curzen N, MacCarthy P, Mullen M, de Belder M, Cox I, Kovac J, Brecker S, Turner M, Khogali S, Malik IS, Alsanjari O, Redwood S, Prendergast B, Trivedi U, Robinson D, Ludman P, de Belder A, Hildick-Smith D. In-hospital stroke after transcatheter aortic valve implantation: A UK observational cohort analysis. Catheter Cardiovasc Interv 2020; 97:E552-E559. [PMID: 32779877 DOI: 10.1002/ccd.29157] [Citation(s) in RCA: 3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 06/27/2020] [Accepted: 07/09/2020] [Indexed: 11/06/2022]
Abstract
OBJECTIVES We sought to identify baseline demographics and procedural factors that might independently predict in-hospital stroke following transcatheter aortic valve implantation (TAVI). BACKGROUND Stroke is a recognized, albeit infrequent, complication of TAVI. Established predictors of procedure-related in-hospital stroke; however, remain poorly defined. METHODS We conducted an observational cohort analysis of the multicenter UK TAVI registry. The primary outcome measure was the incidence of in-hospital stroke. RESULTS A total of 8,652 TAVI procedures were performed from 2007 to 2015. There were 205 in-hospital strokes reported by participating centers equivalent to an overall stroke incidence of 2.4%. Univariate analysis showed that the implantation of balloon-expandable valves caused significantly fewer strokes (balloon-expandable 96/4,613 [2.08%] vs. self-expandable 95/3,272 [2.90%]; p = .020). After multivariable analysis, prior cerebrovascular disease (CVD) (odds ratio [OR] 1.51, 95% confidence interval [CI 1.05-2.17]; p = .03), advanced age at time of operation (OR 1.02 [0.10-1.04]; p = .05), bailout coronary stenting (OR 5.94 [2.03-17.39]; p = .008), and earlier year of procedure (OR 0.93 [0.87-1.00]; p = .04) were associated with an increased in-hospital stroke risk. There was a reduced stroke risk in those who had prior cardiac surgery (OR 0.62 [0.41-0.93]; p = .01) and a first-generation balloon-expandable valve implanted (OR 0.72 [0.53-0.97]; p = .03). In-hospital stroke significantly increased 30-day (OR 5.22 [3.49-7.81]; p < .001) and 1-year mortality (OR 3.21 [2.15-4.78]; p < .001). CONCLUSIONS In-hospital stroke after TAVI is associated with substantially increased early and late mortality. Factors independently associated with in-hospital stroke were previous CVD, advanced age, no prior cardiac surgery, and deployment of a predominantly first-generation self-expandable transcatheter heart valve.
Collapse
Affiliation(s)
- Aung Myat
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK.,Division of Clinical and Experimental Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - Luke Buckner
- Division of Clinical and Experimental Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - Florence Mouy
- Division of Clinical and Experimental Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - James Cockburn
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Andreas Baumbach
- William Harvey Research Institute, Queen Mary University of London, London, UK.,Barts Heart Center, Barts Health NHS Trust, London, UK.,Cardiovascular Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Adrian P Banning
- Oxford Heart Center, Oxford University Hospitals NHS Trust, Oxford, UK
| | - Daniel J Blackman
- Yorkshire Heart Center, The Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Nick Curzen
- Department of Cardiology, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Philip MacCarthy
- Faculty of Life Sciences and Medicine, King's College London and King's College Hospital NHS Foundation Trust, London, UK
| | | | - Mark de Belder
- Barts Heart Center, Barts Health NHS Trust, London, UK.,Cardiology Department, The James Cook University Hospital, Middlesbrough, UK
| | - Ian Cox
- Department of Cardiology, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - Jan Kovac
- Glenfield Hospital, University of Leicester, Leicester, UK
| | - Stephen Brecker
- Cardiology Clinical Academic Group, St. George's University of London and St. George's University Hospitals NHS Foundation Trust, London, UK
| | - Mark Turner
- Bristol Heart Institute, University Hospital Bristol NHS Foundation Trust, Bristol, UK
| | - Saib Khogali
- Heart and Lung Center, New Cross Hospital, Wolverhampton, UK
| | - Iqbal S Malik
- Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Osama Alsanjari
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Simon Redwood
- Cardiothoracic Directorate, Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - Bernard Prendergast
- Cardiothoracic Directorate, Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - Uday Trivedi
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Derek Robinson
- Department of Mathematics, University of Sussex, Brighton, UK
| | - Peter Ludman
- Cardiology Department, Queen Elizabeth Hospital, Birmingham, UK
| | - Adam de Belder
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - David Hildick-Smith
- Sussex Cardiac Center, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| |
Collapse
|
|
8
|
Myat A, Papachristofi O, Trivedi U, Bapat V, Young C, de Belder A, Cockburn J, Baumbach A, Banning AP, Blackman DJ, MacCarthy P, Mullen M, Muir DF, Nolan J, Zaman A, de Belder M, Cox I, Kovac J, Brecker S, Turner M, Khogali S, Malik I, Redwood S, Prendergast B, Ludman P, Sharples L, Hildick-Smith D. Transcatheter aortic valve implantation via surgical subclavian versus direct aortic access: A United Kingdom analysis. Int J Cardiol 2020; 308:67-72. [PMID: 32247575 DOI: 10.1016/j.ijcard.2020.03.059] [Citation(s) in RCA: 3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 02/06/2020] [Accepted: 03/20/2020] [Indexed: 11/27/2022]
Abstract
BACKGROUND Surgical subclavian (SC) and direct aortic (DA) access are established alternatives to the default transfemoral route for transcatheter aortic valve implantation (TAVI). We sought to find differences in survival and procedure-related outcomes after SC- versus DA-TAVI. METHODS We performed an observational cohort analysis of cases prospectively uploaded to the UK TAVI registry. To ensure the most contemporaneous comparison, the analysis focused on SC and DA procedures performed from 2013 to 2015. RESULTS Between January 2013 and July 2015, 82 (37%) SC and 142 (63%) DA cases were performed that had validated 1-year life status. Multivariable regression analysis showed procedure duration was longer for SC cases (SC 193.5 ± 65.8 vs. DA 138.4 ± 57.7 min; p < .01) but length of hospital stay was shorter (SC 8.6 ± 9.5 vs. DA 11.9 ± 10.8 days; p = .03). Acute kidney injury was observed less frequently after SC cases (odds ratio [OR] 0.35, 95% confidence interval [CI 0.12-0.96]; p = .042) but vascular access site-related complications were more common (OR 9.75 [3.07-30.93]; p < .01). Procedure-related bleeding (OR 0.54 [0.24-1.25]; p = .15) and in-hospital stroke rate (SC 3.7% vs. DA 2.1%; p = .67) were similar. There were no significant differences in in-hospital (SC 2.4% vs. DA 4.9%; p = .49), 30-day (SC 2.4% vs. DA 4.2%; p = .71) or 1-year (SC 14.5% vs. DA 21.9%; p = .344) mortality. CONCLUSIONS Surgical subclavian and direct aortic approaches can offer favourable outcomes in appropriate patients. Neither access modality conferred a survival advantage but there were significant differences in procedural metrics that might influence which approach is selected.
Collapse
Affiliation(s)
- Aung Myat
- Sussex Cardiac Centre, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK; Division of Clinical and Experimental Medicine, Brighton and Sussex Medical School, Brighton, UK
| | - Olympia Papachristofi
- London School of Hygiene and Tropical Medicine, London, UK; Novartis Pharma AG, Basel, Switzerland
| | - Uday Trivedi
- Sussex Cardiac Centre, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Vinayak Bapat
- New York-Presbyterian Columbia University Medical Centre, New York, USA; Cardiothoracic Centre, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Christopher Young
- Cardiothoracic Centre, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Adam de Belder
- Sussex Cardiac Centre, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - James Cockburn
- Sussex Cardiac Centre, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - Andreas Baumbach
- Queen Mary University of London, London, UK; Barts Heart Centre, Barts Health NHS Trust, London, UK
| | - Adrian P Banning
- Oxford Heart Centre, Oxford University Hospitals NHS Trust, Oxford, UK
| | - Daniel J Blackman
- Yorkshire Heart Centre, The Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Philip MacCarthy
- King's College London and King's College Hospital NHS Foundation Trust, London, UK
| | | | - Douglas F Muir
- Department of Cardiology, The James Cook University Hospital, Middlesbrough, UK
| | - James Nolan
- Royal Stoke University Hospital, University Hospitals of North Midlands, Stoke, UK
| | - Azfar Zaman
- Freeman Hospital and Institute of Cellular Medicine, Newcastle University, Newcastle, UK
| | - Mark de Belder
- Barts Heart Centre, Barts Health NHS Trust, London, UK; Department of Cardiology, The James Cook University Hospital, Middlesbrough, UK
| | - Ian Cox
- Department of Cardiology, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - Jan Kovac
- Biomedical Research Unit, University of Leicester, Leicester, UK
| | - Stephen Brecker
- Cardiology Clinical Academic Group, St. George's University of London, London, UK
| | - Mark Turner
- Department of Cardiology, Bristol Heart Institute, Bristol, UK
| | - Saib Khogali
- Heart and Lung Centre, New Cross Hospital, Wolverhampton, UK
| | - Iqbal Malik
- Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Simon Redwood
- Cardiothoracic Centre, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Bernard Prendergast
- Cardiothoracic Centre, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Peter Ludman
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - Linda Sharples
- London School of Hygiene and Tropical Medicine, London, UK
| | - David Hildick-Smith
- Sussex Cardiac Centre, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK.
| |
Collapse
|
|
9
|
Whyler NC, Teng JC, Brewster DJ, Chin R, Cox I, Druce J, Prince HM, Sheffield DA, Teh E, Sarode V. Diagnosis of West Nile virus encephalitis in a returned traveller. Med J Aust 2019; 211:501-502.e1. [PMID: 31736076 DOI: 10.5694/mja2.50416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Naomi Ca Whyler
- Cabrini Malvern, Melbourne, VIC.,Alfred Health, Melbourne, VIC
| | | | - David J Brewster
- Cabrini Malvern, Melbourne, VIC.,Cabrini Clinical School, Monash University, Melbourne, VIC
| | - Ruth Chin
- Cabrini Malvern, Melbourne, VIC.,Royal Melbourne Hospital, Melbourne, VIC
| | - Ian Cox
- Cabrini Malvern, Melbourne, VIC
| | - Julian Druce
- Victorian Infectious Diseases Reference Laboratory, Melbourne, VIC
| | - Henry M Prince
- Cabrini Malvern, Melbourne, VIC.,Peter MacCallum Centre, Melbourne, VIC
| | | | - Eugene Teh
- Cabrini Malvern, Melbourne, VIC.,Eastern Health, Melbourne, VIC
| | - Vineet Sarode
- Cabrini Malvern, Melbourne, VIC.,Cabrini Clinical School, Monash University, Melbourne, VIC
| |
Collapse
|
|
10
|
Sangaraju S, Cox I, Dalrymple-Hay M, Lloyd C, Suresh V, Riches T, Melhuish S, Asopa S, Newcombe S, Deutsch C, Bramlage P. Effect of procedural refinement of transfemoral transcatheter aortic valve implantation on outcomes and costs: a single-centre retrospective study. Open Heart 2019; 6:e001064. [PMID: 31673385 PMCID: PMC6802979 DOI: 10.1136/openhrt-2019-001064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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] [Received: 04/04/2019] [Revised: 07/16/2019] [Accepted: 09/12/2019] [Indexed: 11/28/2022] Open
Abstract
Objectives To determine the effect of introducing several procedural refinements of transfemoral transcatheter aortic valve implantation (TAVI) on clinical outcomes and costs. Design Retrospective analysis comparing two consecutive 1-year periods, before and after the introduction of procedural refinements. Setting Tertiary hospital aortic valve programme. Participants Consecutive patients undergoing transfemoral TAVI treated between April 2014 and August 2015 using the initial setup (n=70; control group) or between September 2015 and August 2016 after the introduction of procedural refinements (n=89). Interventions Introduction of conscious sedation, percutaneous access and closure, omission of transoesophageal echocardiography during the procedure, and an early discharge procedure. Outcome measures Procedural characteristics, complications and outcomes; length of stay in intensive care unit (ICU) and hospital; hospital-related direct costs associated with TAVI. Results There were no statistically significant differences in the incidence of complications or mortality between the two groups. The mean length of stay in the ICU was significantly shorter in the procedural-refinement group compared with the control group (5.1 vs 57.2 hours, p<0.001), as was the mean length of hospital stay (4.7 vs 6.6 days, p<0.001). The total cost per TAVI procedure was significantly lower, by £3580, in the procedural-refinement group (p<0.001). This was largely driven by lower ICU costs. Conclusions Among patients undergoing transfemoral TAVI, procedural refinement facilitated a shorter stay in ICU and earlier discharge from hospital and was cost saving compared with the previous setup.
Collapse
Affiliation(s)
| | - Ian Cox
- Cardiology, University Hospitals Plymouth NHS, Plymouth, Devon, UK
| | | | - Clinton Lloyd
- Cardiology, University Hospitals Plymouth NHS, Plymouth, Devon, UK
| | | | - Tania Riches
- Cardiology, University Hospitals Plymouth NHS, Plymouth, Devon, UK
| | | | - Sanjay Asopa
- Cardiology, University Hospitals Plymouth NHS, Plymouth, Devon, UK
| | | | - Cornelia Deutsch
- Institute for Pharmacology and Preventive Medicine, Cloppenburg, Germany
| | - Peter Bramlage
- Institute for Pharmacology and Preventive Medicine, Cloppenburg, Germany
| |
Collapse
|
|
11
|
Rogers LJ, Cox I, Dalrymple-Hay M, Lloyd C. Transapical valve-in-ring mitral valve implantation through the anterior mitral valve leaflet. Eur J Cardiothorac Surg 2018; 54:1140-1141. [PMID: 29868864 DOI: 10.1093/ejcts/ezy212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 03/08/2018] [Accepted: 05/04/2018] [Indexed: 11/14/2022] Open
Abstract
Transcatheter mitral valve implantation is a relatively novel intervention that replaces the mitral valve of individuals deemed too high-risk or unsuitable for surgery. It is associated with a number of specific risks, including left ventricular outflow tract obstruction. In this report, we present the case of a 75-year-old man who was unable to undergo redo surgical repair and had a number of risk factors for left ventricular outflow tract obstruction. To minimize this risk, we deployed transcatheter mitral valve implantation within the anterior mitral valve leaflet resulting in mild mitral valve regurgitation postoperatively and no left ventricular outflow tract obstruction. Long-term durability of this approach is yet to be determined, but we believe that this intervention adds to the armamentarium of the heart team.
Collapse
Affiliation(s)
- Luke J Rogers
- Department of Cardiac Surgery, Plymouth Hospitals NHS Trust, Plymouth, UK
| | - Ian Cox
- Department of Cardiology, Plymouth Hospitals NHS Trust, Plymouth, UK
| | | | - Clinton Lloyd
- Department of Cardiac Surgery, Plymouth Hospitals NHS Trust, Plymouth, UK
| |
Collapse
|
|
12
|
Rogers L, Villaquiran J, Cox I, Dalrymple-Hay M, Lloyd C. Transapical valve-in-ring mitral valve implantation through the anterior mitral valve leaflet. Multimed Man Cardiothorac Surg 2018; 2018. [PMID: 30192453 DOI: 10.1510/mmcts.2018.031] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Transcatheter mitral valve implantation (TMVI) is a relatively novel intervention used to replace the mitral valve of individuals deemed too high risk or unsuitable for surgery. It is associated with a number of specific risks, including left ventricular outflow tract obstruction (LVOTO). In this video tutorial we present the case of a 75-year-old man who was unable to undergo redo surgical repair and had a number of risk factors for LVOTO. To minimize these risks, we deployed the TMVI within the anterior mitral valve leaflet. The postoperative result was mild mitral valve regurgitation and no LVOTO. The long-term outcome of this approach is yet to be determined but we believe this technique offers a novel method to manage a select group of patients suffering with mitral valve disease and at risk of LVOTO.
Collapse
Affiliation(s)
- Luke Rogers
- University Hospitals Plymouth NHS Trust, Department of Cardiothoracic Surgery, Derriford Hospital, Plymouth, United Kingdom
| | | | - Ian Cox
- Department of Cardiology, Plymouth Hospitals NHS Trust
| | | | - Clinton Lloyd
- Department of Cardiac Surgery, Plymouth Hospitals NHS Trust
| |
Collapse
|
|
13
|
Wiesenborn DS, Schneider A, Victoria B, Spinel L, Martyniak K, Cox I, Masternak MM. The effect of calorie restriction on adiponectin and mir-146 in skeletal muscle and adipose tissue of Ames dwarf mice. Exp Gerontol 2017. [DOI: 10.1016/j.exger.2017.02.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
|
14
|
|
|
15
|
Karnowski K, Grulkowski I, Mohan N, Cox I, Wojtkowski M. Quantitative optical inspection of contact lenses immersed in wet cell using swept source OCT. Opt Lett 2014; 39:4727-4730. [PMID: 25121859 DOI: 10.1364/ol.39.004727] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We demonstrate swept source optical coherence tomography (OCT) imaging of contact lenses (CLs) in a wet cell and comprehensive quantitative characterization of CLs from volumetric OCT datasets. The approach is based on a technique developed for lens autopositioning and autoleveling enabled by lateral capillary interactions between the wet cell wall and the lens floating on the liquid surface. The demonstrated OCT imaging has enhanced contrast due to the application of a scattering medium and it improves visualization of both CL interfaces and edges. We also present precise and accurate three-dimensional metrology of soft and rigid CLs based on the OCT data. The accuracy and precision of the extracted lens parameters are compared with the manufacturer's specifications. The presented methodology facilitates industrial inspection methods of the CLs.
Collapse
|
|
16
|
Peterson M, Cox I, Eckstein M. The use of the eyes for human face recognition explained through information distribution analysis. J Vis 2010. [DOI: 10.1167/8.6.894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
|
17
|
Ang RET, Chan WK, Wee TL, Lee HM, Bunnapradist P, Cox I. Efficacy of an aspheric treatment algorithm in decreasing induced spherical aberration after laser in situ keratomileusis. J Cataract Refract Surg 2009; 35:1348-57. [PMID: 19631119 DOI: 10.1016/j.jcrs.2009.03.039] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2008] [Revised: 02/13/2009] [Accepted: 03/12/2009] [Indexed: 10/20/2022]
Abstract
PURPOSE To determine the effectiveness of an aspheric laser in situ keratomileusis (LASIK) algorithm for myopia with and without astigmatism in minimizing postoperative induction of spherical aberration. SETTING Four sites in Asia. METHODS Patients with -1.00 to -10.00 diopters (D) of spherical myopia with -4.00 D or less of astigmatism were recruited. Patients randomly had bilateral Zyoptix aspheric algorithm (aspheric group) or bilateral conventional Zyoptix Tissue Saving algorithm (control group). A Technolas 217z100 excimer system was used for LASIK ablation. Visual effectiveness, safety, higher-order aberrations, and corneal asphericity (Q value) were evaluated postoperatively. RESULTS The aspheric group comprised 86 eyes and the control group, 84 eyes. At 3 months, the high-contrast uncorrected distance visual acuity was 20/20 or better in 78% of eyes in the aspheric group and 83% of eyes in the control group. The control treatment induced 0.22 microm of spherical aberration, which was significantly higher than the 0.04 microm induced with the aspheric treatment (6.0 mm pupil) (P<.0001). The aspheric treatment induced significantly less vertical coma and trefoil (P = .02). Eyes in the aspheric group had significantly lower Q values (P<.0001). There was no statistically significant difference in the manifest refraction spherical equivalent between the 2 groups (P >.05). Although high- and low-contrast corrected distance visual acuity (CDVA) was similar between the groups, the aspheric group gained more lines of low-contrast CDVA. CONCLUSION The aspheric algorithm was more effective than the conventional algorithm in reducing induced spherical aberration and maintaining corneal asphericity after myopic LASIK.
Collapse
|
|
18
|
Vedamurthy I, Harrison WW, Liu Y, Cox I, Schor CM. The influence of first near-spectacle reading correction on accommodation and its interaction with convergence. Invest Ophthalmol Vis Sci 2009; 50:4215-22. [PMID: 19264892 DOI: 10.1167/iovs.08-3021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE Accommodation and convergence can adapt to blur and disparity stimuli and to age-related changes in accommodative amplitude. Does this ability decline with age? The authors investigated short-term adaptation to first near-spectacle reading correction on the accommodative-stimulus response (ASR) function, accommodative amplitude (AA), AC/A, and CA/C ratios in a pre-presbyopic and an incipient presbyopic population and determined whether changes in these functions recovered after discontinuation of the use of near spectacles. METHODS Thirty subjects with normal vision participated; their ages ranged from 21 to 30 years (n = 15) and 38 to 44 years (n = 15). Oculomotor functions were measured before and after single-vision reading spectacles were worn for near tasks over a 2-month period and then 2 months after the use of near spectacles was discontinued. RESULTS The slope of the ASR function and the AC/A and CA/C ratios did not change significantly after near spectacles were worn. There was a hyperopic shift of the ASR function that significantly reduced the near point of accommodation (NPA) and lowered the far-point refraction. These changes were age invariant and did not recover after 2 months of discontinuation of near spectacle wear. CONCLUSIONS These results imply that the NPA may be enhanced normally by tonic bias of accommodation that elevates the entire ASR function and produces myopic refraction bias. When this bias relaxes after reading spectacles are worn, there is a hyperopic shift of the refractive state and a reduction of the NPA, specified from optical infinity.
Collapse
Affiliation(s)
- Indu Vedamurthy
- School of Optometry, University of California at Berkeley, Berkeley, California 94720, USA
| | | | | | | | | |
Collapse
|
|
19
|
Affiliation(s)
- Jianhua Wang
- From the Bascom Palmer Eye Institute, University of Miami, Miami, Florida; the2Department of Ophthalmology, University of Rochester, Rochester, New York; and
| | - Ian Cox
- Bausch & Lomb, Rochester, New York
| | | |
Collapse
|
|
20
|
Cox I, Beggs S. Paediatric analgesia. Aust Prescr 2008. [DOI: 10.18773/austprescr.2008.080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
|
|
21
|
Manghat N, Van Lingen R, Hewson P, Syed F, Kakani N, Cox I, Roobottom C, Morgan-Hughes G. Usefulness of 64-detector row computed tomography for evaluation of intracoronary stents in symptomatic patients with suspected in-stent restenosis. Am J Cardiol 2008; 101:1567-73. [PMID: 18489934 DOI: 10.1016/j.amjcard.2008.01.042] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2007] [Revised: 01/25/2008] [Accepted: 01/25/2008] [Indexed: 11/16/2022]
Abstract
To determine whether 64-slice multidetector computed tomographic coronary angiography (MDCTA) can accurately assess the coronary artery lumen in symptomatic patients with previous coronary artery stents and potential in-stent restenosis (ISR). The primary aim was to determine the accuracy of binary ISR exclusion using MDCTA compared with invasive catheter angiography (ICA). Secondary aims were comparisons of stent dimensions measured using MDCTA and variables that affect accuracy. Forty patients with previous stent placement underwent both ICA and 64-slice MDCTA after elective presentation with chest pain, and ICA quantitative coronary angiographic data were used as the reference standard. Thirty-six men and 4 women (age 64 +/- 10 years; range 44 to 83) with 103 stents (2.8 +/- 1.6 stents/patient) were comparatively evaluated (stent exclusion rate 9.6%). There were 45 bare-metal and 58 drug-eluting stents (20 +/- 18 months after implantation) with an average diameter of 3.23 +/- 0.7 mm. Overall accuracy for the detection of significant ISR showed sensitivity, specificity, and positive and negative predictive values of 85%, 86%, 61%, and 96% for proximal stents > or =3 mm, which improved to 100%, 94%, 81%, and 100%; if the visible luminal diameter on MDCTA was <1.5 mm, accuracy decreased to 40%, 84%, 29%, and 90%, respectively. In conclusion, 64-slice MDCTA assessment of symptomatic patients with suspected clinically significant ISR is a realistic alternative to ICA if reference stent diameter is > or =2.5 mm and visible lumen cross-sectional diameter is > or =1.5 mm, for which a negative MDCTA result virtually excludes the presence of significant ISR.
Collapse
Affiliation(s)
- Nathan Manghat
- Department of Clinical Radiology, Derriford Hospital, Plymouth, Devon, United Kingdom
| | | | | | | | | | | | | | | |
Collapse
|
|
22
|
Nagy LJ, MacRae S, Yoon G, Wyble M, Wang J, Cox I, Huxlin KR. Photorefractive keratectomy in the cat eye: biological and optical outcomes. J Cataract Refract Surg 2007; 33:1051-64. [PMID: 17531702 PMCID: PMC1993426 DOI: 10.1016/j.jcrs.2007.02.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2006] [Accepted: 02/12/2007] [Indexed: 10/23/2022]
Abstract
PURPOSE To quantify optical and biomechanical properties of the feline cornea before and after photorefractive keratectomy (PRK) and assess the relative contribution of different biological factors to refractive outcome. SETTING Department of Ophthalmology, University of Rochester, Rochester, New York, USA. METHODS Adult cats had 6.0 diopter (D) myopic or 4.0 D hyperopic PRK over 6.0 or 8.0 mm optical zones (OZ). Preoperative and postoperative wavefront aberrations were measured, as were intraocular pressure (IOP), corneal hysteresis, the corneal resistance factor, axial length, corneal thickness, and radii of curvature. Finally, postmortem immunohistochemistry for vimentin and alpha-smooth muscle actin was performed. RESULTS Photorefractive keratectomy changed ocular defocus, increased higher-order aberrations, and induced myofibroblast differentiation in cats. However, the intended defocus corrections were only achieved with 8.0 mm OZs. Long-term flattening of the epithelial and stromal surfaces was noted after myopic, but not after hyperopic, PRK. The IOP was unaltered by PRK; however, corneal hysteresis and the corneal resistance factor decreased. Over the ensuing 6 months, ocular aberrations and the IOP remained stable, while central corneal thickness, corneal hysteresis, and the corneal resistance factor increased toward normal levels. CONCLUSIONS Cat corneas exhibited optical, histological, and biomechanical reactions to PRK that resembled those previously described in humans, especially when the OZ size was normalized to the total corneal area. However, cats exhibited significant stromal regeneration, causing a return to preoperative corneal thickness, corneal hysteresis and the corneal resistance factor without significant regression of optical changes induced by the surgery. Thus, the principal effects of laser refractive surgery on ocular wavefront aberrations can be achieved despite clear interspecies differences in corneal biology.
Collapse
Affiliation(s)
- Lana J Nagy
- Department of Ophthalmology, University of Rochester, 601 Elmwood Avenue, Rochester, NY 14642, USA
| | | | | | | | | | | | | |
Collapse
|
|
23
|
Affiliation(s)
- C Hui
- Southern Health, Clayton Road, Clayton, Victoria, Australia
| | | |
Collapse
|
|
24
|
Abstract
PURPOSE To objectively quantify corneal light backscatter after LASIK using optical coherence tomography (OCT). METHODS Twenty-eight eyes of 14 patients (mean age: 39.9 +/- 8.6 years) underwent LASIK surgery. Corneal images were taken with a custom built anterior segment OCT at 1310 nm before and 1 day, 1 week, and 1 month after surgery. Backscattered light from the epithelium and 10 equally divided corneal stromal layers of the central cornea were analyzed using custom software. Light scattering of the interface area (defined as seven image pixels [46.2 microm] in depth centered by the peak corresponding to the interface between the corneal flap and bed) was also calculated and compared to the light backscatter at an equivalent depth of the respective preoperative cornea. RESULTS There were significant differences of light backscatter in different layers (analysis of variance [ANOVA]: F(10, 130) = 44.89, P = .0001), but no significant differences between right and left eyes preoperatively (ANOVA: F(10, 130) = 1.16, P = .32). After surgery, there were significant differences in light backscatter profiles of the central cornea (repeated measures ANOVA: F(30, 810) = 7.70, P = .0001) with significant increases at approximately 140 to 190 microm in depth from the corneal front surface at 1 day (post hoc test: P = .004) and 1 week (post hoc test: P = .001) postoperatively, compared to the baseline. One month after surgery, light backscatter increased significantly in the epithelium (post hoc test: P = .0001) and decreased significantly (post hoc test: P = .0001) at approximately 100 to 140 microm in depth. Light backscatter results of these interface areas (repeated measures ANOVA: F(3, 81) = 21.29, P = .0001) showed significant increases at 1 day and 1 week postoperatively (post hoc tests: P = .0001) compared to baseline results and 1-month postoperative results. CONCLUSIONS Objective and quantitative analysis of corneal light backscatter from OCT demonstrated increasing comeal light scattering at the interface and subsequent recovery.
Collapse
Affiliation(s)
- Jianhua Wang
- Dept of Ophthalmology, Box 314, University of Rochester Medical Center, Rochester, NY 14642, USA.
| | | | | |
Collapse
|
|
25
|
Wang J, Thomas J, Cox I, Rollins A. Noncontact measurements of central corneal epithelial and flap thickness after laser in situ keratomileusis. Invest Ophthalmol Vis Sci 2004; 45:1812-6. [PMID: 15161844 DOI: 10.1167/iovs.03-1088] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To investigate the changes in the epithelium and flap after laser in situ keratomileusis (LASIK), when measured with optical coherence tomography (OCT). METHODS Twenty-eight eyes of 14 patients (age: 39.9 +/- 8.6 years) underwent LASIK. The central thickness of corneal epithelium and flap were measured with a real-time 1310 nm OCT 1 day, 1 week, and 1 month after surgery. A custom software program was used to process multiple images of each eye on each visit. RESULTS After surgery, the corneal epithelium changed significantly (ANOVA: F((3, 81)) = 12.3, P = 0.000) with not statistically significant thinning at one day (mean +/- SD: 57.8 +/- 5.9 micro m, P = 0.26, compared with baseline: 59.9 +/- 5.9 micro m) and statistically significant thickening at 1 week (60.8 +/- 5.8 micro m, P = 0.04, compared with 1 day) and 1 month (64.6 +/- 6.1 micro m, P = 0.008 compared with all others). There were statistically significant changes in the corneal flap thickness (ANOVA: F((2, 54)) = 4.59, P = 0.01) with thickening in the intervals between 1 day (143.3 +/- 20.6 micro m) and 1 week (149.7 +/- 24.6 micro m, P = 0.12), and between 1 week and 1 month (152.7 +/- 19.3 micro m, P = 0.01). There was a strong correlation (r = 0.898) between the difference of corneal thickness before and after surgery and predicted laser ablation depth. CONCLUSIONS OCT is a useful noncontact tool for thickness measurements of the epithelium, flap, and total cornea. After LASIK, the epithelium and flap showed thickening during the study period.
Collapse
Affiliation(s)
- Jianhua Wang
- School of Optometry, University of Waterloo, Waterloo, Ontario, Canada.
| | | | | | | |
Collapse
|
|
26
|
Abstract
The Bausch & Lomb Zyoptix system provides a customized approach to corneal sculpting resulting in improvements in best-corrected visual acuity and contrast sensitivity over that achieved in conventional laser in situ keratomileusis surgery.
Collapse
Affiliation(s)
- Arun C Gulani
- Gulani Vision Institute, Jacksonville, FL 32209, USA.
| | | | | | | |
Collapse
|
|
27
|
Abstract
OBJECTIVE Although amygdala abnormalities are sometimes suspected in "imaging-negative" patients with video EEG confirmed unilateral focal epilepsy suggestive of temporal lobe epilepsy (TLE), amygdala asymmetry is difficult to assess visually. This study examined a group of "imaging-negative" TLE patients, estimating amygdala volumes, to determine whether cryptic amygdala lesions might be detected. METHODS Review of video EEG monitoring data yielded 11 patients with EEG lateralised TLE and normal structural imaging. Amygdala volumes were estimated in this group, in 77 patients with pathologically verified hippocampal sclerosis (HS), and in 77 controls. RESULTS Seven of 11 "imaging-negative" cases had both significant amygdala asymmetry and amygdala enlargement, concordant with seizure lateralisation. Although significant amygdala asymmetry occurred in 35 of 77 HS patients, it was never attributable to an abnormally large ipsilateral amygdala. Compared with patients with HS, patients with amygdala enlargement were less likely to have suffered secondarily generalised seizures (p<0.05), and had an older age of seizure onset (p<0.01). CONCLUSION Abnormal amygdala enlargement is reported in seven cases of "imaging-negative" TLE. Such abnormalities are not observed in patients with HS. It is postulated that amygdala enlargement may be attributable to a developmental abnormality or low grade tumour. It is suggested that amygdala volumetry is indicated in the investigation and diagnosis of "imaging-negative" TLE.
Collapse
Affiliation(s)
- S P C Bower
- Department of Clinical Neurosciences, St Vincent's Hospital, Melbourne, Australia.
| | | | | | | | | | | | | |
Collapse
|
|
28
|
Affiliation(s)
- L Pickering
- Department of Oncology, St. George's Hospital Medical School, London, UK
| | | | | |
Collapse
|
|
29
|
Shipman C, Pearce A, Addington-Hall J, Cox I, Richards S. Cancer services. Left to chance. Health Serv J 2001; 111:24-5. [PMID: 11432360] [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: 02/20/2023]
Abstract
Most primary care groups/trusts have cancer lead posts and have some involvement in planning and commissioning cancer services. Cancer is not a high priority in comparison to other national service frameworks and the transition to PCT status. PCG/Ts want help and information about developing cancer services but not all want this now. Most PCG/Ts have some involvement in cancer networks but information needs exist about their role and potential.
Collapse
Affiliation(s)
- C Shipman
- Department of Palliative Care and Policy, King's College London
| | | | | | | | | |
Collapse
|
|
30
|
Abstract
It is important to support general practitioners (GPs) in maintaining and developing their palliative care skills as most of the final year of a patient's life is spent at home under the care of the primary health care team. The training needs and uptake of GPs have been explored, but little is known about how GP educational preferences vary. The aim of this study was to explore the current educational preferences of GPs in different geographical locations as part of an evaluation of an educational intervention. The methods used included postal questionnaires sent to 1061 GPs. Results from 640 (60%) of GPs revealed that half (51%) wanted education in symptom control for non-cancer patients. More inner-city GPs wanted education in opiate prescribing (43%), controlling nausea and vomiting (45%), and using a syringe driver (38%) than their urban and rural colleagues (26%, 29% and 21%, respectively). Increased educational preference and increased difficulty in accessing information was associated with reduced confidence in symptom control. To maximize educational uptake it will be important for educational strategies to be developed and targeted according to variations in demand, and in particular to respond to the need for palliative care education in symptom control for patients suffering from advanced non-malignant disease.
Collapse
Affiliation(s)
- C Shipman
- Department of Palliative Care and Policy, Guy's, King's & St. Thomas' School of Medicine, Bessemer Road, London SE5 9PJ, UK.
| | | | | | | | | | | | | |
Collapse
|
|
31
|
Abstract
There is currently considerable debate concerning the visual impact of correcting the higher order aberrations of the eye. We describe new measurements of a large population of human eyes and compute the visual benefit of correcting higher order aberrations. We also describe the increase in contrast sensitivity when higher order aberrations are corrected with an adaptive optics system. All these results suggest that many, though not all, observers with normal vision would receive worthwhile improvements in spatial vision from customized vision correction, at least over a range of viewing distances and particularly when the pupils are large. Keratoconic patients or patients suffering from spherical aberration as a result of laser refractive surgery as it is presently performed would especially benefit. These results encourage the development of methods to correct higher order aberrations.
Collapse
Affiliation(s)
- D Williams
- Center for Visual Science, University of Rochester, NY 14627, USA.
| | | | | | | | | | | |
Collapse
|
|
32
|
Cox I. Insurance medicine. J R Coll Physicians Lond 2000; 34:394-6. [PMID: 11005081 PMCID: PMC9665491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
|
|
33
|
Shipman C, Addington-Hall J, Barclay S, Briggs J, Cox I, Daniels L, Millar D. Providing palliative care in primary care: how satisfied are GPs and district nurses with current out-of-hours arrangements? Br J Gen Pract 2000; 50:477-8. [PMID: 10962787 PMCID: PMC1313727] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
The complex needs of palliative care patients require an informed, expert, and swift response from out-of-hours general medical services, particularly if hospital admission is to be avoided. Few general practitioners (GPs) reported routinely handing over information on their palliative care patients, particularly to GP co-operatives. District nurses and inner-city GPs were least satisfied with aspects of out-of-hours care. Most responders wanted 24-hour availability of specialist palliative care. This indicates a need to develop and evaluate out-of-hours palliative care procedures and protocols, particularly for GP co-operatives, and to improve inter-agency collaboration.
Collapse
Affiliation(s)
- C Shipman
- Department of Palliative Care and Policy, Guy's, King's and St Thomas' School of Medicine, London.
| | | | | | | | | | | | | |
Collapse
|
|
34
|
Cox I, Haworth P. Cardiac disease in guinea pigs. Vet Rec 2000; 146:620. [PMID: 10870771] [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: 02/16/2023]
|
|
35
|
Cox I, Stevens S. Care of ophthalmic surgical instruments. Community Eye Health 2000; 13:40-1. [PMID: 17491960 PMCID: PMC1705974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Affiliation(s)
- I Cox
- Sister-in-Charge, Kikuyu Eye Unit, P O Box 1021, Kikuyu, Kenya
| | | |
Collapse
|
|
36
|
Atherton DJ, Cox I, Hann I. Intravenous iron (III) hydroxide-sucrose complex for anaemia in epidermolysis bullosa. Br J Dermatol 1999; 140:773. [PMID: 10233353] [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: 02/12/2023]
|
|
37
|
Abstract
OBJECTIVES The aim of the study was investigate the prevalence of abnormal values of cardiac troponin T (cTnT) and cardiac troponin I (cTnI) in patients with chronic renal failure (CRF) and their clinical significance. DESIGN AND METHODS We investigated the concentrations of cTnT and cTnI in 49 CRF patients without heart disease or diabetes. Cardiac TnT values were measured with a second generation immunoassay and cTnI with two immunoassays with different analytical sensitivity. All CRF patients underwent regular clinical follow-up over a 18-month period. RESULTS No patients with CRF had elevated values of cTnI when measured with one assay and only 2 patients displayed minimally elevated values with the second assay. In contrast, 23 CRF patients (47%) displayed cTnT concentrations elevated above the upper reference limit. The elevated cTnT values observed were below the values detected in acute myocardial infarction and were not associated with adverse cardiac events during follow-up. CONCLUSIONS Mildly elevated cTnT concentrations are common in patients with CRF and do not appear to be associated with adverse coronary events.
Collapse
Affiliation(s)
- P Musso
- Department of Cardiology, Ospedale Civile, Ivrea, Italy.
| | | | | | | | | |
Collapse
|
|
38
|
|
|
39
|
Abstract
The relationship was examined between the self-reported cooperativeness of Australian secondary-school students and their involvement in peer abuse at school, both as bullies and as victims. An 18-item Likert-type measure, the Cooperativeness Scale, was developed, and its reliability and concurrent validity were supported by the results of its application to two samples of Australian students (N = 176 and N = 763, respectively) attending different coeducational secondary schools, the first in a predominantly middle-class area and the second in a lower class socioeconomic area. At both schools, girls scored higher in cooperativeness than boys. Students at the second school also anonymously completed multiple measures of the extent of their involvement during the current year in bullying, victimization, or both. As predicted, correlations and multiple regression analyses supported the hypothesis that relatively low levels of cooperativeness were characteristic, not only of both boys and girls who engaged in bullying, but also, to a lesser extent, of those who were frequently victimized by their peers at school.
Collapse
Affiliation(s)
- K Rigby
- Faculty of Humanities and Social Science, University of South Australia, Underdale, Australia
| | | | | |
Collapse
|
|
40
|
Rigby K, Cox I. The contribution of bullying at school and low self-esteem to acts of delinquency among Australian teenagers. Personality and Individual Differences 1996. [DOI: 10.1016/0191-8869(96)00105-5] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
|
41
|
Kaski JC, Chen L, Crook R, Cox I, Tousoulis D, Chester MR. Coronary stenosis progression differs in patients with stable angina pectoris with and without a previous history of unstable angina. Eur Heart J 1996; 17:1488-94. [PMID: 8909904 DOI: 10.1093/oxfordjournals.eurheartj.a014711] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
OBJECTIVES To compare the evolution of stenoses responsible for acute coronary events with those not associated with acute coronary syndromes. METHODS AND RESULTS We prospectively studied angiographic stenosis progression in 190 stable angina patients, with single vessel disease, who were awaiting non-urgent coronary angioplasty. Sixty four patients had a previous history of unstable angina (Group 1) and 126 patients had no history of unstable angina (Group 2). Culprit stenoses were classified as "complex' or "smooth'. At restudy, 8 +/- 4 months after the first angiogram, 12 of 63 culprit stenoses in Group 1 had progressed and seven of 125 in Group 2 (19% vs 6%, P = 0.0044). Thirteen of 68 complex culprit stenoses had progressed, compared with only 6 of 120 smooth culprit stenoses (19% vs 5%, P = 0.003). Coronary events occurred in 12 Group 1 patients and nine Group 2 patients (P = 0.02). CONCLUSIONS In patients with stable angina, stenoses associated with previous episodes of unstable angina are more likely to progress than stenoses not associated with previous unstable angina. Unstable coronary atherosclerotic plaques, even those that have been clinically stable for more than 3 months, may retain the potential for rapid progression to total occlusion.
Collapse
Affiliation(s)
- J C Kaski
- Department of Cardiological Sciences, St. George's Hospital Medical School, London, U.K
| | | | | | | | | | | |
Collapse
|
|
42
|
Affiliation(s)
- S Heenan
- Department of Diagnostic Radiology, St George's Hospital, London, UK
| | | | | | | | | |
Collapse
|
|
43
|
Tirman PF, Feller JF, Palmer WE, Carroll KW, Steinbach LS, Cox I. The Buford complex--a variation of normal shoulder anatomy: MR arthrographic imaging features. AJR Am J Roentgenol 1996; 166:869-73. [PMID: 8610565 DOI: 10.2214/ajr.166.4.8610565] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
OBJECTIVE The purpose of this study was to show the MR arthrographic imaging features of a normal anatomic variation of the shoulder: the absence of the anterior superior labrum and the presence of a "cordlike" middle glenohumeral ligament,which together are known as the Buford complex. MATERIALS AND METHODS We retrospectively analyzed the MR arthrographic examinations of 10 patients with arthroscopically proven Buford complexes. RESULTS MR arthrographic examinations showed an absent anterior superior labrum and an associated cordlike middle glenohumeral ligament in all patients. No contiguous tear of the superior labrum or anterior inferior labrum was evident. Originally, this variation was mistakenly diagnosed as a labral avulsion in two of the 10 patients. Also, a differential diagnosis of a superior labral tear was mistakenly offered for four patients. CONCLUSION An absent anterior superior labrum and an associated cordlike middle glenohumeral ligament represent the normal variation that is known as the Buford complex rather than an avulsed labrum. This normal variation may be mistaken for a detached labrum.
Collapse
Affiliation(s)
- P F Tirman
- San Francisco Magnetic Resonance Center, CA, USA
| | | | | | | | | | | |
Collapse
|
|
44
|
|
|
45
|
Roberts TP, Kucharczyk J, Cox I, Moseley ME, Prayer L, Dillon W, Bleyl K, Harnish P. Sprodiamide-injection-enhanced magnetic resonance imaging of cerebral perfusion. Phase I clinical trial results. Invest Radiol 1994; 29 Suppl 2:S24-6. [PMID: 7928245 DOI: 10.1097/00004424-199406001-00009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- T P Roberts
- Neuroradiology Section, University of California, San Francisco
| | | | | | | | | | | | | | | |
Collapse
|
|
46
|
Cox I, Apollonio A, Erickson P. The effect of add power on simultaneous vision, monocentric, bifocal, soft lens visual performance. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0892-8967(93)90050-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
|
47
|
|
|
48
|
Abstract
Some investigators have suggested that the poor quality of vision which some spherical, single vision, soft lens-wearing patients report may be a result of spherical aberration induced in the ocular system when a soft lens is placed on the eye. In this study, the longitudinal spherical aberration of spherical soft lenses, both on and off the eye, was calculated using an aspheric corneal model and two-dimensional ray tracing program. Specifically designed front-surface aspheric, soft lenses were produced which demonstrated levels of in-air power variation similar to that calculated for similar-parameter spherically surface lenses. The effect of these lenses on the visual performance of nine subjects was assessed by measuring changes in contrast sensitivity and high contrast visual acuity through 3- and 6-mm artificial pupils. Significant losses of contrast sensitivity were recorded for the spherically aberrated lenses with the 6-mm pupil but not with the 3-mm pupil. High contrast acuity was not affected by any of the aberrated lenses with either the 3- or 6-mm pupils. Theoretical calculations and the contrast sensitivity results indicate that negatively powered lenses produce significantly less spherical aberration in situ than positively powered lenses. Because the majority of the prepresbyopic soft lens-wearing population have low to moderate amounts of myopia, it would appear that soft lens-induced spherical aberration is unlikely to be responsible for the reduction in visual performance which some patients report when corrected with single vision soft lenses.
Collapse
Affiliation(s)
- I Cox
- Cornea & Contact Lens Research Unit, School of Optometry, University of New South Wales, Sydney, Australia
| | | |
Collapse
|
|
49
|
|
|
50
|
Cox I, Zantos SG, Orsborn GN. The overnight corneal swelling response of non-wear, daily wear, and extended wear soft lens patients. ACTA ACUST UNITED AC 1990. [DOI: 10.1016/0892-8967(90)90031-a] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|