The Experts below are selected from a list of 4773 Experts worldwide ranked by ideXlab platform
B Silke - One of the best experts on this subject based on the ideXlab platform.
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Sources of inaccuracy in the use of the Hawksley random-zero sphygmomanometer.
Journal of hypertension, 1997Co-Authors: C Mcgurk, A Nugent, D Mcauley, B SilkeAbstract:To identify possible causes of inaccuracy in the use of the Hawksley random-zero sphygmomanometer and methods that could reduce this. Four Hawksley random-zero sphygmomanometers were compared with a standard sphygmomanometer under static conditions. Two methods (standard and rapid) were used to release pressure from the inflated cuff with pressures recorded by independent blinded observers. The rate at which the Hand Valve released pressure was analysed. The effects of varying filling times and pressures on the size of the final zero correction were investigated. The Hawksley devices all under-recorded pressure compared with that measured by using a standard machine. A rapid means of pressure release approximately halved this error in each case. Pressure release through the Hand Valve was shown to have a characteristic and prolonged exponential decay. Using low filling times and pressures reduced the observed range of zeros seen, with the production of a correlation between the size of the zero and the inflation pressure used. These findings suggest that overestimation of the final zero correction is a common and major source of error in the use of the Hawksley sphygmomanometer. A simple change in the design of the final pressure release would improve the machine's reliability in clinical usage. The machine's zero mechanism is susceptible to unintentional misuse. Such misuse could occur when the machine is used in accordance with current sphygmomanometry guidelines.
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Sources of inaccuracy in the use of the Hawksley random-zero sphygmomanometer.
Journal of Hypertension, 1997Co-Authors: C Mcgurk, A. G. Nugent, Daniel F. Mcauley, B SilkeAbstract:Objective To identify possible causes of inaccuracy in the use of the Hawksley random-zero sphygmomanometer and methods that could reduce this. Methods Four Hawksley random-zero sphygmomanometers were compared with a standard sphygmomanometer under static conditions. Two methods (standard and rapid) were used to release pressure from the inflated cuff with pressures recorded by independent blinded observers. The rate at which the Hand Valve released pressure was analysed. The effects of varying filling times and pressures on the size of the final zero correction were investigated. Results The Hawksley devices all under-recorded pressure compared with that measured by using a standard machine. A rapid means of pressure release approximately halved this error in each case. Pressure release through the Hand Valve was shown to have a characteristic and prolonged exponential decay. Using low filling times and pressures reduced the observed range of zeros seen, with the production of a correlation between the size of the zero and the inflation pressure used. Conclusion These findings suggest that overestimation of the final zero correction is a common and major source of error in the use of the Hawksley sphygmomanometer. A simple change in the design of the final pressure release would improve the machine's reliability in clinical usage. The machine's zero mechanism is susceptible to unintentional misuse. Such misuse could occur when the machine is used in accordance with current sphygmomanometry guidelines.
Tadeusz Namiotko - One of the best experts on this subject based on the ideXlab platform.
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Dynamics of sexual and parthenogenetic populations of Eucypris virens (Crustacea: Ostracoda) in three temporary ponds
Hydrobiologia, 2009Co-Authors: Maria João Fernandes Martins, Jochen Vandekerkhove, Francesc Mezquita, Olivier Schmit, Juan Rueda, Giampaolo Rossetti, Tadeusz NamiotkoAbstract:Eucypris virens is a freshwater ostracod in which both sexual reproduction and parthenogenesis occur. Sympatric coexistence of both reproductive modes is known in zones of overlap. This renders the species a potentially valuable model organism to study the ‘queen of evolutionary problems’, i.e. why sex is so successful despite its costs (paradox of sex). In order to maximally exploit this potential, a broad knowledge of the species’ ecology is essential, including an understanding of its life history and population dynamics. Here, the phenology of the species was followed in three temporary ponds through monthly (Spain) or fortnightly (Poland) samplings, throughout an inundation period. This study confirms the wide ecological tolerances of E. virens . Although the species is generally assumed to be univoltine, two hatching periods were observed in the Spanish sites. Biotic interactions, especially predation, appear to be the important determinants of population dynamics in long-hydroperiod sites. Abiotic conditions may influence population dynamics through their impact on egg hatching. In the site with male presence, the initially female-biased sex ratio evolved towards a balanced sex ratio through the season. No consistent differences in limb morphology were observed between females originating from the three study sites. On the other Hand, Valve size of adult females varied among sites, possibly influenced by local environmental conditions (mainly salinity and pH) as well as the expected genetic diversity.
C Mcgurk - One of the best experts on this subject based on the ideXlab platform.
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Sources of inaccuracy in the use of the Hawksley random-zero sphygmomanometer.
Journal of hypertension, 1997Co-Authors: C Mcgurk, A Nugent, D Mcauley, B SilkeAbstract:To identify possible causes of inaccuracy in the use of the Hawksley random-zero sphygmomanometer and methods that could reduce this. Four Hawksley random-zero sphygmomanometers were compared with a standard sphygmomanometer under static conditions. Two methods (standard and rapid) were used to release pressure from the inflated cuff with pressures recorded by independent blinded observers. The rate at which the Hand Valve released pressure was analysed. The effects of varying filling times and pressures on the size of the final zero correction were investigated. The Hawksley devices all under-recorded pressure compared with that measured by using a standard machine. A rapid means of pressure release approximately halved this error in each case. Pressure release through the Hand Valve was shown to have a characteristic and prolonged exponential decay. Using low filling times and pressures reduced the observed range of zeros seen, with the production of a correlation between the size of the zero and the inflation pressure used. These findings suggest that overestimation of the final zero correction is a common and major source of error in the use of the Hawksley sphygmomanometer. A simple change in the design of the final pressure release would improve the machine's reliability in clinical usage. The machine's zero mechanism is susceptible to unintentional misuse. Such misuse could occur when the machine is used in accordance with current sphygmomanometry guidelines.
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Sources of inaccuracy in the use of the Hawksley random-zero sphygmomanometer.
Journal of Hypertension, 1997Co-Authors: C Mcgurk, A. G. Nugent, Daniel F. Mcauley, B SilkeAbstract:Objective To identify possible causes of inaccuracy in the use of the Hawksley random-zero sphygmomanometer and methods that could reduce this. Methods Four Hawksley random-zero sphygmomanometers were compared with a standard sphygmomanometer under static conditions. Two methods (standard and rapid) were used to release pressure from the inflated cuff with pressures recorded by independent blinded observers. The rate at which the Hand Valve released pressure was analysed. The effects of varying filling times and pressures on the size of the final zero correction were investigated. Results The Hawksley devices all under-recorded pressure compared with that measured by using a standard machine. A rapid means of pressure release approximately halved this error in each case. Pressure release through the Hand Valve was shown to have a characteristic and prolonged exponential decay. Using low filling times and pressures reduced the observed range of zeros seen, with the production of a correlation between the size of the zero and the inflation pressure used. Conclusion These findings suggest that overestimation of the final zero correction is a common and major source of error in the use of the Hawksley sphygmomanometer. A simple change in the design of the final pressure release would improve the machine's reliability in clinical usage. The machine's zero mechanism is susceptible to unintentional misuse. Such misuse could occur when the machine is used in accordance with current sphygmomanometry guidelines.
Maria João Fernandes Martins - One of the best experts on this subject based on the ideXlab platform.
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Dynamics of sexual and parthenogenetic populations of Eucypris virens (Crustacea: Ostracoda) in three temporary ponds
Hydrobiologia, 2009Co-Authors: Maria João Fernandes Martins, Jochen Vandekerkhove, Francesc Mezquita, Olivier Schmit, Juan Rueda, Giampaolo Rossetti, Tadeusz NamiotkoAbstract:Eucypris virens is a freshwater ostracod in which both sexual reproduction and parthenogenesis occur. Sympatric coexistence of both reproductive modes is known in zones of overlap. This renders the species a potentially valuable model organism to study the ‘queen of evolutionary problems’, i.e. why sex is so successful despite its costs (paradox of sex). In order to maximally exploit this potential, a broad knowledge of the species’ ecology is essential, including an understanding of its life history and population dynamics. Here, the phenology of the species was followed in three temporary ponds through monthly (Spain) or fortnightly (Poland) samplings, throughout an inundation period. This study confirms the wide ecological tolerances of E. virens . Although the species is generally assumed to be univoltine, two hatching periods were observed in the Spanish sites. Biotic interactions, especially predation, appear to be the important determinants of population dynamics in long-hydroperiod sites. Abiotic conditions may influence population dynamics through their impact on egg hatching. In the site with male presence, the initially female-biased sex ratio evolved towards a balanced sex ratio through the season. No consistent differences in limb morphology were observed between females originating from the three study sites. On the other Hand, Valve size of adult females varied among sites, possibly influenced by local environmental conditions (mainly salinity and pH) as well as the expected genetic diversity.
Francesc Mezquita - One of the best experts on this subject based on the ideXlab platform.
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Dynamics of sexual and parthenogenetic populations of Eucypris virens (Crustacea: Ostracoda) in three temporary ponds
Hydrobiologia, 2009Co-Authors: Maria João Fernandes Martins, Jochen Vandekerkhove, Francesc Mezquita, Olivier Schmit, Juan Rueda, Giampaolo Rossetti, Tadeusz NamiotkoAbstract:Eucypris virens is a freshwater ostracod in which both sexual reproduction and parthenogenesis occur. Sympatric coexistence of both reproductive modes is known in zones of overlap. This renders the species a potentially valuable model organism to study the ‘queen of evolutionary problems’, i.e. why sex is so successful despite its costs (paradox of sex). In order to maximally exploit this potential, a broad knowledge of the species’ ecology is essential, including an understanding of its life history and population dynamics. Here, the phenology of the species was followed in three temporary ponds through monthly (Spain) or fortnightly (Poland) samplings, throughout an inundation period. This study confirms the wide ecological tolerances of E. virens . Although the species is generally assumed to be univoltine, two hatching periods were observed in the Spanish sites. Biotic interactions, especially predation, appear to be the important determinants of population dynamics in long-hydroperiod sites. Abiotic conditions may influence population dynamics through their impact on egg hatching. In the site with male presence, the initially female-biased sex ratio evolved towards a balanced sex ratio through the season. No consistent differences in limb morphology were observed between females originating from the three study sites. On the other Hand, Valve size of adult females varied among sites, possibly influenced by local environmental conditions (mainly salinity and pH) as well as the expected genetic diversity.
