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Sruthi NU, Rao PS, Bennett SJ, Bhattarai RR. Formulation of a Synergistic Enzyme Cocktail for Controlled Degradation of Sorghum Grain Pericarp. Foods 2023; 12:foods12020306. [PMID: 36673398 PMCID: PMC9857962 DOI: 10.3390/foods12020306] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 01/05/2023] [Accepted: 01/05/2023] [Indexed: 01/11/2023] Open
Abstract
Sorghum is one of the major grains produced worldwide for food and fodder, owing to its nutritional profile advantages. However, the utilisation of whole grain sorghum as an ingredient in conventional food formulations is limited due to its poor digestibility, which requires the removal of the outer fibrous layers. Grain breakage and loss of essential nutrients also disadvantage traditional milling practices. Using carbohydrate degrading enzymes to hydrolyse the grain pericarp is a novel approach to biopolishing, where selective degradation of the pericarp layers occurs without adversely affecting the nutrient profile. A collective synergism of enzymes has been proven to cause effective hydrolysis compared to individual enzymes due to the complex presence of non-starch polysaccharides in the grain's outer layers, which comprise a variety of sugars that show specific degradation with respect to each enzyme. The present study aimed to formulate such an enzyme cocktail with xylanase, cellulase, and pectinase in different proportions for hydrolysing sorghum grain pericarp by determining the yield of specific sugars in the pericarp extract after a certain period of incubation. The results showed that the xylanase enzyme has a major effect on the grain bran composition compared to cellulase and pectinase; however, a synergistic mixture yielded more hydrolysed sugars and anti-nutrients in the extract compared to each of the enzymes individually. The results were confirmed by morphological and crystallinity studies of the soaked grain. Compared to conventional water-soaked samples, grains soaked in a cocktail with 66.7% xylanase, 16.7% cellulase, and 16.7% pectinase had visibly thinner and more degraded fibre layers.
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Affiliation(s)
- N. U. Sruthi
- School of Molecular and Life Sciences, Faculty of Science and Engineering, Curtin University, Bentley 6102, Australia
- Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Pavuluri Srinivasa Rao
- Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Sarita Jane Bennett
- School of Molecular and Life Sciences, Faculty of Science and Engineering, Curtin University, Bentley 6102, Australia
| | - Rewati Raman Bhattarai
- School of Molecular and Life Sciences, Faculty of Science and Engineering, Curtin University, Bentley 6102, Australia
- Correspondence:
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Chatur P, Johnson S, Coorey R, Bhattarai RR, Bennett SJ. The Effect of High Pressure Processing on Textural, Bioactive and Digestibility Properties of Cooked Kimberley Large Kabuli Chickpeas. Front Nutr 2022; 9:847877. [PMID: 35464029 PMCID: PMC9023011 DOI: 10.3389/fnut.2022.847877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
High pressure processing is a non-thermal method for preservation of various foods while retaining nutritional value and can be utilized for the development of ready-to-eat products. This original research investigated the effects of high pressure processing for development of a ready-to eat chickpea product using Australian kabuli chickpeas. Three pressure levels (200, 400, and 600 MPA) and two treatment times (1 and 5 min) were selected to provide six distinct samples. When compared to the conventionally cooked chickpeas, high pressure processed chickpeas had a more desirable texture due to decrease in firmness, chewiness, and gumminess. The general nutrient composition and individual mineral content were not affected by high pressure processing, however, a significant increase in the slowly digestible starch from 50.53 to 60.92 g/100 g starch and a concomitant decrease in rapidly digestible starch (11.10-8.73 g/100 g starch) as well as resistant starch (50.53-30.35 g/100 g starch) content was observed. Increased starch digestibility due to high pressure processing was recorded, whereas in vitro protein digestibility was unaffected. Significant effects of high pressure processing on the polyphenol content and antioxidant activities (DPPH, ABTS and ORAC) were observed, with the sample treated at the highest pressure for the longest duration (600 MPa, 5 min) showing the lowest values. These findings suggest that high pressure processing could be utilized to produce a functional, ready to eat kabuli chickpea product with increased levels of beneficial slowly digestible starch.
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Affiliation(s)
- Prakhar Chatur
- School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
| | - Stuart Johnson
- School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
- Ingredients by Design Pty Ltd., Perth, WA, Australia
| | - Ranil Coorey
- School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
| | | | - Sarita Jane Bennett
- School of Molecular and Life Sciences, Curtin University, Bentley, WA, Australia
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Oliveira KR, Souza Junior JP, Bennett SJ, Checchio MV, Alves RDC, Felisberto G, Prado RDM, Gratão PL. Exogenous silicon and salicylic acid applications improve tolerance to boron toxicity in field pea cultivars by intensifying antioxidant defence systems. Ecotoxicol Environ Saf 2020; 201:110778. [PMID: 32480161 DOI: 10.1016/j.ecoenv.2020.110778] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 05/12/2020] [Accepted: 05/17/2020] [Indexed: 06/11/2023]
Abstract
Field peas (Pisum sativum L.) are widely cultivated throughout the world as a cool season grain and forage crop. Boron (B) toxicity is caused by high B concentration in the soil or irrigation water, and is particularly problematic in medium or heavier textured soil types with moderate alkalinity and low annual rainfall. Previous studies have indicated that B-toxicity increases oxidative stress in plants, and B-tolerance has been considered an important target in field pea plant breeding programmes. Inducers of tolerance may be a promising alternative for plant breeding. Little research has been conducted on the combined use of silicon (Si) and salicylic acid (SA) to remediate B-toxicity in field peas. The present study revealed the physiological and biochemical plant responses of applying Si + SA under B-toxicity (15 mg B L-1) on two Brazilian field pea cultivars (Iapar 83 and BRS Forrageira). A semi-hydroponic experiment was conducted using a completely randomized factorial design (2 × 5): with two field pea cultivars and five treatments which were formed by individual and combined applications of Si and SA under B-toxicity plus a control (control, B, B + Si, B + SA, and B + Si + SA). Si (2 mmol L-1) was applied to plants in two forms (root and leaf), while for SA (36 μmol L-1) only foliar applications were applied. Our results demonstrated that the combined use of exogenous Si + SA in field peas increased tolerance to B-toxicity through an intensified antioxidant plant defence system, resulting in a better regulation of reactive oxygen species (ROS) production and degradation. It significantly increased total chlorophyll and carotenoids contents, the activities of major antioxidant enzymes, and reduced MDA and H2O2 contents, resulting in increased fresh shoot and total plant dry biomass. The application of Si + SA alleviated the inhibitory effects of boron toxicity in field peas, resulting in greater plant growth by preventing oxidative membrane damage through an increased tolerance to B-excess within the plant tissue. Therefore, the use of Si + SA is an important and sustainable strategy to alleviate B-toxicity in field pea cultivation.
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Affiliation(s)
- Kevein Ruas Oliveira
- São Paulo State University (UNESP). Faculty of Agrarian and Veterinary Sciences. Department of Biology Applied to Agriculture, CEP 14884-900, Jaboticabal, São Paulo, Brazil
| | - Jonas Pereira Souza Junior
- São Paulo State University (UNESP). Faculty of Agrarian and Veterinary Sciences. Department of Agricultural Production Sciences, CEP 14884-900, Jaboticabal, São Paulo, Brazil
| | - Sarita Jane Bennett
- Curtin University. School of Molecular and Life Sciences, GPO Box U1987, Perth, WA 6845, Australia
| | - Mirela Vantini Checchio
- São Paulo State University (UNESP). Faculty of Agrarian and Veterinary Sciences. Department of Biology Applied to Agriculture, CEP 14884-900, Jaboticabal, São Paulo, Brazil
| | - Rita de Cássia Alves
- Semi-Arid National Institute (INSA). Crop Production Center, CEP 58437-700, Campina Grande, Paraíba, Brazil
| | - Guilherme Felisberto
- São Paulo State University (UNESP). Faculty of Agrarian and Veterinary Sciences. Department of Agricultural Production Sciences, CEP 14884-900, Jaboticabal, São Paulo, Brazil
| | - Renato de Mello Prado
- São Paulo State University (UNESP). Faculty of Agrarian and Veterinary Sciences. Department of Agricultural Production Sciences, CEP 14884-900, Jaboticabal, São Paulo, Brazil
| | - Priscila Lupino Gratão
- São Paulo State University (UNESP). Faculty of Agrarian and Veterinary Sciences. Department of Biology Applied to Agriculture, CEP 14884-900, Jaboticabal, São Paulo, Brazil.
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Wadley AJ, Chen YW, Bennett SJ, Lip GYH, Turner JE, Fisher JP, Aldred S. Monitoring changes in thioredoxin and over-oxidised peroxiredoxin in response to exercise in humans. Free Radic Res 2015; 49:290-8. [PMID: 25547896 DOI: 10.3109/10715762.2014.1000890] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
INTRODUCTION Peroxiredoxin (PRDX) and thioredoxin (TRX) are antioxidant proteins that control cellular signalling and redox balance, although their response to exercise is unknown. This study aimed to assess key aspects of the PRDX-TRX redox cycle in response to three different modes of exercise. METHODS Healthy males (n = 10, mean ± SD: 22 ± 3 yrs) undertook three exercise trials on separate days: two steady-state cycling trials at moderate (60% [Formula: see text]O2MAX; 27 min, MOD) and high (80% [Formula: see text]O2MAX; 20 min, HIGH) intensities, and a low-volume high-intensity interval training trial (10 × 1 min 90% [Formula: see text]O2MAX, LV-HIIT). Peripheral blood mononuclear cells were assessed for TRX-1 and over-oxidised PRDX (isoforms I-IV) protein expression before, during, and 30 min following exercise (post + 30). The activities of TRX reductase (TRX-R) and the nuclear factor kappa B (NF-κB) p65 subunit were also assessed. RESULTS TRX-1 increased during exercise in all trials (MOD, + 84.5%; HIGH, + 64.1%; LV-HIIT, + 205.7%; p < 05), whereas over-oxidised PRDX increased during HIGH only (MOD, - 28.7%; HIGH, + 202.9%; LV-HIIT, - 22.7%; p < .05). TRX-R and NF-κB p65 activity increased during exercise in all trials, with the greatest response in TRX-R activity seen in HIGH (p < 0.05). DISCUSSION All trials stimulated a transient increase in TRX-1 protein expression during exercise. Only HIGH induced a transient over-oxidation of PRDX, alongside the greatest change in TRX-R activity. Future studies are needed to clarify the significance of heightened peroxide exposure during continuous high-intensity exercise and the mechanisms of PRDX-regulatory control.
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Affiliation(s)
- A J Wadley
- School of Sport, Exercise & Rehabilitation Sciences, University of Birmingham , Edgbaston, Birmingham , UK
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5
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Abstract
Multisensory perception and action in 3-ball cascade juggling was investigated in intermediate-skilled performers by manipulating vision (full or lower field restricted) or ball weight (equal or different). There were main effects for both independent variables but no interactions. Manipulation of ball weight had a more pervasive effect on performance outcome, as well as central tendency and dispersion of kinematic measures of the juggling action. A common finding to both manipulations was that balls were tossed to higher zeniths, thus increasing parabola height and flight time. For intermediate-skilled jugglers, proprioception-haptics available when the balls were in the hands and vision of the balls and hands around the moment of ball toss and catch both make a contribution to the juggling action.
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Affiliation(s)
- R Sánchez García
- Facultad de Ciencias de la Actividad Física y Deporte, Universidad Europea de Madrid, Spain
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6
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Ismail SIMF, Bennett SJ. Vaginal delivery after myomectomy: challenges and opportunities. Arch Gynecol Obstet 2009; 280:669-70. [PMID: 19224231 DOI: 10.1007/s00404-009-0980-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2008] [Accepted: 02/02/2009] [Indexed: 10/21/2022]
Affiliation(s)
- Sharif I M F Ismail
- Department of Obstetrics and Gynaecology, North Devon District Hospital, Devon, UK.
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Ismail SIMF, Bennett SJ. Pregnancy and mode of delivery in patients with familial polyposis. J OBSTET GYNAECOL 2007; 27:200-1. [PMID: 17454482 DOI: 10.1080/01443610601138018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- S I M F Ismail
- Department of Obstetrics and Gynaecology, North Devon District Hospital, Barnstaple, Devon, UK.
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Abstract
PURPOSE The purpose of the study was to examine the coordination of reaching and walking behaviour when children with Spastic Hemiparetic Cerebral Palsy (SHCP) intercept an approaching and hence externally-timed object. METHOD Using either the impaired or non-impaired arm, children intercepted a ball approaching from a fixed distance with one of three velocities. Each participant's initial starting position was scaled to their maximum walking velocity determined prior to testing; for the medium ball velocity, participants would arrive at the point of interception at the correct time if they walked with their maximum velocity. RESULTS Children with SHCP adapted their reaching and walking behaviour to the different ball approach velocities. These adaptations were exhibited when using the impaired and non-impaired arm, and resulted in similar outcome performance irrespective of which arm was used. Still, children with SHCP found it necessary to increase trunk movement to compensate for the decreased elbow excursion and a decreased peak velocity of the impaired arm. CONCLUSION Children with SHCP exhibited specific adaptations to their altered movement capabilities when performing a behaviourally-realistic task. The provision of an external timing constraint appeared to facilitate both reaching and walking movements and hence could represent a useful technique in rehabilitation.
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Affiliation(s)
- Annieck X C Ricken
- Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Free University of Amsterdam, The Netherlands.
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Ricken AXC, Savelsbergh GJP, Bennett SJ. External timing constraints facilitate performance of everyday interceptive actions in children with Spastic Hemiparetic Cerebral Palsy. Neurosci Lett 2006; 410:187-92. [PMID: 17101219 DOI: 10.1016/j.neulet.2006.08.088] [Citation(s) in RCA: 8] [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] [Subscribe] [Scholar Register] [Received: 01/20/2006] [Revised: 06/28/2006] [Accepted: 08/30/2006] [Indexed: 11/15/2022]
Abstract
We examined how children with Spastic Hemiparetic Cerebral Palsy (SHCP) perform interceptive actions they experience in daily life. Children were required to walk towards and intercept a stationary ball or a moving ball, with either their impaired or non-impaired arm. In the stationary ball condition the child was free to determine the speed of their response (internal timing), whereas in the moving ball condition there was a restricted time available (external timing). It was found that the reach movements of the non-impaired arm were different to the impaired arm, and were characterized by some of the typical movement limitations imposed by SHCP. However, there was no evidence of increased contribution from trunk motion or a lengthening of reach movement time or deceleration time. Instead, there was a coordinated change with the walking kinematics, whereby the children spent proportionately more time slowing down as they approached the point of interception when reaching with the impaired arm. There were also several differences in the response when intercepting a moving ball compared to a stationary ball. When the timing constraints were imposed externally (moving ball) rather than internally (stationary ball), children reached with a reduced movement time and deceleration time, and an increased peak wrist velocity and elbow excursion. These adaptations to behaviour were necessary to deal with the restricted time available to make the interception in the moving ball condition compared to when the ball was stationary, and reveal how children with SHCP coordinate walking and reaching when performing natural interceptive actions.
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Affiliation(s)
- Annieck X C Ricken
- Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Free University of Amsterdam, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands
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Court MLJ, Bennett SJ, Williams AM, Davids K. Effects of attentional strategies and anxiety constraints on perceptual-motor organisation of rhythmical arm movements. Neurosci Lett 2005; 384:17-22. [PMID: 15905030 DOI: 10.1016/j.neulet.2005.04.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2005] [Revised: 04/07/2005] [Accepted: 04/13/2005] [Indexed: 10/25/2022]
Abstract
Effects of anxiety on perceptual-motor organisation of rhythmical forearm movements were examined using an interrupted time series design with staggered baselines. Participants were exposed to repeated baseline sessions interrupted with two anxiety-inducing sessions. Results showed that under moderate levels of anxiety, determined from CSAI-2 and heart rate data, phase relations between oscillating forearms became more stable in in-phase (0 degrees ) and anti-phase (180 degrees ) modes, although these patterns were not maintained in baseline sessions following the anxiety manipulation. Data were consistent with participants employing a strategy of allocating greater attentional effort in stabilizing preferred co-ordination patterns under anxiety-inducing conditions. Results suggest that anxiety can temporarily act as a source of behavioural information, leading to the re-parameterisation of participants' intrinsic dynamics.
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Abstract
An experiment was conducted to examine the stability of the anti-phase and in-phase modes of coordination by means of both fluctuations and relaxation times. Participants (n=6) performed a rhythmic bimanual forearm coordination task that required them to oscillate their forearms in-phase and anti-phase while grasping two manipulanda at fixed frequencies ranging from 0.6 to 1.8 Hz. Relaxation times were measured as the time taken to return to a stable mode following the application of a transient mechanical torque. It was found that relaxation times were not different statistically across participants, frequencies, and coordinative modes. However, fluctuations, as indicated by the mean S.D. of relative phase across individual frequency plateaus, were significantly greater in the anti-phase than in the in-phase mode of coordination, p<0.05. Whilst providing new empirical support for the notion that relaxation times should be of the same order of magnitude at frequencies outside transition regions, the findings suggest that the level of stochastic noise in the anti-phase mode is greater than that of the in-phase mode. Implications are made for the future assessment of local pattern stability.
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Affiliation(s)
- M L J Court
- School of Human Sciences, Research Institute for Sport and Exercise Sciences, Henry Cotton Campus, Liverpool John Moores University, UK.
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Abstract
OBJECTIVES Objectives of this study were to: (1) describe perceived social support during a baseline hospitalization and 12 months later among heart failure patients; (2) examine differences in social support as a function of gender and age (less than 65 and 65 years or older); and (3) examine social support as a predictor of health-related quality of life. BACKGROUND Social support is a predictor of well-being and mortality, but little is known about support patterns among heart failure patients and how they influence quality of life. METHODS The sample included 227 hospitalized patients with heart failure who completed the Social Support Survey and the Chronic Heart Failure Questionnaire at baseline; 147 patients completed these questionnaires again 12 months after baseline. RESULTS Mean baseline and 12-month total support scores were 56 and 53, respectively, with a score of 76 indicating the most positive perceptions of support. The ANOVA indicated significant interactions of gender by age for total (F = 5.04; p = 0.03) and emotional/informational support (F = 4.87; p = 0.03) and for positive social interactions (F = 4.43; p = 0.04), with men under age 65 perceiving less support than men aged 65 and older and women in either age group. Baseline support did not predict 12-month health-related quality of life, but changes in social support significantly predicted changes in health-related quality of life (R2 = 0.14). CONCLUSIONS Overall, perceptions of support were moderate to high, but there was wide variation in perceptions over time. Men under age 65 reported less support than other groups of patients. Importantly, changes in social support were significant predictors of changes in health-related quality of life.
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Affiliation(s)
- S J Bennett
- Indiana University School of Nursing, Indianapolis 46202, USA.
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Murray MD, Deer MM, Ferguson JA, Dexter PR, Bennett SJ, Perkins SM, Smith FE, Lane KA, Adams LD, Tierney WM, Brater DC. Open-label randomized trial of torsemide compared with furosemide therapy for patients with heart failure. Am J Med 2001; 111:513-20. [PMID: 11705426 DOI: 10.1016/s0002-9343(01)00903-2] [Citation(s) in RCA: 187] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE Because the bioavailability of oral furosemide is erratic and often incomplete, we tested the hypothesis that patients with heart failure who were treated with torsemide, a predictably absorbed diuretic, would have more favorable clinical outcomes than would those treated with furosemide. PATIENTS AND METHODS We conducted an open-label trial of 234 patients with chronic heart failure (mean [+/- SD] age, 64 +/- 11 years) from an urban public health care system. Patients received oral torsemide (n = 113) or furosemide (n = 121) for 1 year. The primary endpoint was readmission to the hospital for heart failure. Secondary endpoints included readmission for all cardiovascular causes and for all causes, numbers of hospital days, and health-related quality of life. RESULTS Compared with furosemide-treated patients, torsemide-treated patients were less likely to need readmission for heart failure (39 [32%] vs. 19 [17%], P <0.01) or for all cardiovascular causes (71 [59%] vs. 50 [44%], P = 0.03). There was no difference in the rate of admissions for all causes (92 [76%] vs. 80 [71%], P = 0.36). Patients treated with torsemide had significantly fewer hospital days for heart failure (106 vs. 296 days, P = 0.02). Improvements in dyspnea and fatigue scores from baseline were greater among patients treated with torsemide, but the differences were statistically significant only for fatigue scores at months 2, 8, and 12. CONCLUSIONS Compared with furosemide-treated patients, torsemide-treated patients were less likely to be readmitted for heart failure and for all cardiovascular causes, and were less fatigued. If our results are confirmed by blinded trials, torsemide may be the preferred loop diuretic for patients with chronic heart failure.
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Affiliation(s)
- M D Murray
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Al-Abood SA, Davids KF, Bennett SJ. Specificity of task constraints and effects of visual demonstrations and verbal instructions in directing learners' search during skill acquisition. J Mot Behav 2001; 33:295-305. [PMID: 11495834 DOI: 10.1080/00222890109601915] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [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: 10/20/2022]
Abstract
In the present study, the efficacy of visual demonstrations and verbal instructions as instructional constraints on the acquisition of movement coordination was investigated. Fifteen participants performed an aiming task on 100 acquisition and 20 retention trials, under 1 of 3 conditions: a modeling group (MG), a verbally directed group (VDG), and a control group (CG). The MG observed a model intermittently throughout acquisition, whereas the VDG was verbally instructed to use the model's movement pattern. Participants in the CG received neither form of instruction. Kinematic analysis revealed that compared with verbal instructions or no instructions, visual demonstrations significantly improved participants' approximation of the model's coordination pattern. No differences were found in movement outcomes. Coordination data supported the visual perception perspective on observational learning, whereas outcome data suggested that the modeling effect is mainly a function of task constraints, that is, the novelty of a movement pattern.
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Affiliation(s)
- S A Al-Abood
- Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager, Cheshire ST7 2HL, UK.
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Al-Abood SA, Davids K, Bennett SJ, Ashford D, Martinez Marin M. Effects of manipulating relative and absolute motion information during observational learning of an aiming task. J Sports Sci 2001; 19:507-20. [PMID: 11461054 DOI: 10.1080/026404101750238962] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [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: 10/16/2022]
Abstract
In the visual perception perspective of observational learning, the manipulation of relative and absolute motion information in visual demonstrations optimally directs learners' search towards appropriate task solutions. We assessed the effect of emphasizing transformational information and removal of structural information using point-light kinematic displays in approximating the model's relative motion patterns. Participants viewed computer-simulated point-light demonstrations or normal video demonstrations before and intermittently throughout 100 acquisition trials with knowledge of results on an underarm modified-dart aiming task. On the next day, all participants performed 20 retention trials without demonstrations. The kinematics of spatial and temporal coordination and control variables were examined relative to the model's action, as well as performance scores. The results indicated that approximation of the model's spatial and temporal coordination and control patterns was achieved after observation of either type of demonstrations. No differences were found in movement outcomes. In a second experiment, the effects of manipulating absolute motion information by slow-motion demonstrations were examined relative to real-time demonstrations. Real-time demonstrations led to a closer approximation to the model's spatial and temporal coordination patterns and better outcome scores, contradicting predictions that slow-motion displays convey intact relative motion information. We speculate that the effect of visual demonstration speed on action perception and reproduction is a function of task constraints--that is, novelty or familiarity of relative motion of demonstrated activities.
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Affiliation(s)
- S A Al-Abood
- Department of Exercise and Sport Science, The Manchester Metropolitan University, Alsager, UK.
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17
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Abstract
PURPOSE The aim of this study was to investigate the segmental coordination of vertical jumps under fatigue. METHODS Twelve subjects performed maximal countermovement jumps with and without fatigue, which was imposed by maximal continuous jumps in place until their maximal jump height corresponded to 70% of the nonfatigued condition. Video, ground reaction forces, and electromyographic signals were recorded to analyze the segmental coordination of countermovement jumps before (CMJ1) and after (CMJ2) fatigue. The magnitude of joint extension initiation, peak joint angular velocity, and peak net power around the ankle, knee, and hip joints and their respective times were determined. RESULTS CMJ2 was characterized by a longer contact time, which was accompanied with an earlier movement initiation and several differences (P < 0.05) in the variables used to describe coordination. When the movement duration was normalized with respect to the contact phase duration, the differences between CMJ1 and CMJ2 were not sustained. A consistent pattern was indicated, in which the segmental coordination did not differ between jump conditions. When the magnitude of the muscle activation was set aside, a remarkably consistent muscle activation time was noticed between conditions. CONCLUSIONS It was indicated that countermovement jumps were performed with a consistent well-timed motion of the segments. A "common drive," which acts without the knowledge of the muscle properties, was suggested as mediating and controlling the muscle activation timing between agonist-antagonist muscle pairs.
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Affiliation(s)
- A L Rodacki
- The Manchester Metropolitan University, Department of Exercise and Sport Sciences, Alsager, Staffordshire, United Kingdom.
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Bennett SJ, Perkins SM, Lane KA, Forthofer MA, Brater DC, Murray MD. Reliability and validity of the compliance belief scales among patients with heart failure. Heart Lung 2001; 30:177-85. [PMID: 11343003 DOI: 10.1067/mhl.2001.114193] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [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] [Indexed: 11/22/2022]
Abstract
BACKGROUND Lack of medication and dietary compliance leads to troublesome symptoms and hospitalization in patients with heart failure. Compliance behaviors are influenced by beliefs about the behavior. OBJECTIVE The purpose of this study was to evaluate the reliability and validity of the Beliefs about Medication Compliance Scale (BMCS) and the Beliefs about Dietary Compliance Scale (BDCS) among patients with heart failure. THEORETICAL FRAMEWORK This study's theoretical framework is the Health Belief Model. METHODS A convenience sample of 234 patients with heart failure completed the BMCS and the BDCS. Patients completed the scales at baseline by face-to-face interviews and at 8 and 52 weeks after baseline by telephone interview. RESULTS Construct validity of the scales was supported by confirmatory factor analysis. Both the BMCS and the BDCS had benefits and barriers scales with clear factor loadings. The internal consistency reliability estimates of the scales ranged from.63 to.88, with the BMCS having some estimates lower than.70. The test-retest reliability estimates ranged from.07 to.57. The intraclass correlation coefficient estimates were higher between the 8-week and 52-week scores for all scales. Possible reasons for the varying estimates are discussed. CONCLUSIONS The BMCS and the BDCS have documented reliability and validity. Future work should be directed at evaluating the responsiveness of the scales to changing patient conditions and testing interventions to improve medication and dietary compliance through changing beliefs.
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Affiliation(s)
- S J Bennett
- Indiana University School of Nursing, , Indianapolis, IN 46202, USA
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Bennett SJ, van der Kamp J, Savelsbergh GJ, Davids K. Discriminating the role of binocular information in the timing of a one-handed catch. The effects of telestereoscopic viewing and ball size. Exp Brain Res 2000; 135:341-7. [PMID: 11146812 DOI: 10.1007/s002210000520] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [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: 11/30/2022]
Abstract
Previous work using prediction-motion tasks has indicated that time-to-contact estimates are based exclusively on binocular information when the approaching object is small. The aim of this study was to examine the influence of object size on the use of binocular information sources in specifying time-to-contact in one-handed catching. Subjects (n = 10) were required to time their grasp to catch different-sized balls (60, 80, and 100 mm in diameter) approaching with a constant spatial trajectory and constant velocity of 2.0 m/s. Binocular information was manipulated with a telestereoscope that increased the individuals' effective interocular separation. Subjects performed six trials with each of the different-sized balls in normal and telestereoscopic viewing conditions. It was found that subjects closed the hand earlier when catching the small and medium balls under telestereoscopic viewing compared with normal viewing; furthermore, that subjects closed their hand earlier for the small and medium balls compared with the large ball under telestereoscopic viewing. With regard to hand aperture, there was an effect of ball size, with the hand being opened to a wider aperture for each increase in ball size. Subjects also opened the hand to a wider aperture when catching the small and medium balls under telestereoscopic viewing. These findings are consistent with the notion of an increased reliance on the use of binocular information when the approaching object is small. Furthermore, they indicate that binocular and monocular sources of information are not used in isolation, but rather in combination to support the timing of one-handed catching.
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Affiliation(s)
- S J Bennett
- Psychology Research Group, Department of Exercise and Sport Sciences, Manchester Metropolitan University, Alsager ST7 2HL, UK.
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Armstrong TA, Barish KN, Batsouli S, Bennett SJ, Bertaina M, Chikanian A, Coe SD, Cormier TM, Davies R, Dover CB, Fachini P, Fadem B, Finch LE, George NK, Greene SV, Haridas P, Hill JC, Hirsch AS, Hoversten R, Huang HZ, Jaradat H, Kumar BS, Lainis T, Lajoie JG, Li Q, Libby B. Antideuteron yield at the AGS and coalescence implications. Phys Rev Lett 2000; 85:2685-2688. [PMID: 10991208 DOI: 10.1103/physrevlett.85.2685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2000] [Indexed: 05/23/2023]
Abstract
We present Experiment 864's measurement of invariant antideuteron yields in 11.5A GeV/c Au+Pt collisions. The analysis includes 250x10(6) triggers representing 14x10(9) 10% central interactions sampled for events with high mass candidates. We find (1/2pip(t))d(2)N/dydp(t) = 3.5+/-1.5(stat)+0.9-0.5(syst)x10(-8) GeV-2 c(2) for 1.8<y<2.2, < p(t)> = 0.35 GeV/c ( y(c.m.) = 1.6) and 3.7+/-2.7(stat)+1.4-1.5(syst)x10(-8) GeV-2 c(2) for 1.4<y<1.8, < p(t)> = 0.26 GeV/c, and a coalescence parameter B2; of 4.1+/-2. 9(stat)+2.3-2.4(syst)x10(-3) GeV2 c(-3). Implications for coalescence and antimatter annihilation are discussed.
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Affiliation(s)
- TA Armstrong
- Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Abstract
In the present study, the co-ordination of grasp and transport components of one-handed catching was examined following mechanical perturbations applied to the wrist. Six skilled catchers (mean age = 27.5 years) performed 64 trials in which tennis balls were projected at approximately 8 ms-1. The trial blocks consisted of 10 non-perturbed trials (NPTs) (baseline), and a block of 54 trials of which 20 trials were perturbed. The perturbation was in the form of a resistive force (12 N) applied via a piece of cord attached to a mechanical brake. In baseline trials participants reached maximal wrist velocity closer to the time of hand-ball contact (237 ms +/- 68) than in the perturbed (309 ms +/- 61) condition. Furthermore the wrist velocity profile of five out of six participants exhibited a double peak immediately after a perturbation. However, aperture variables such as the relative moment of final hand closure (approximately 70% of overall movement time) were not typically affected. The stability of grasp and transport coupling for one-handed catching was shown to vary from trial to trial. Skilled performers exploited redundant degrees of freedom in the motor system when faced with a sudden, unexpected change in task constraints.
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Affiliation(s)
- C Button
- Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager, Stoke-on-Trent, Cheshire, UK.
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Abstract
Heart failure is a major health problem in the United States leading to high rates of mortality and morbidity and impaired quality of life. Assisting patients to improve compliance with their self-care regimen, including medications, dietary sodium restrictions, and self-monitoring (daily weights, edema assessment), may improve these poor outcomes. This article describes the development and initial evaluation of Heart Messages, a theory-based, tailored message intervention to improve compliance with the self-care regimen recommended for patients with heart failure. The project involved four phases, each of which is described in this article. The Heart Messages tailored message intervention program is available in both printed and Web-based formats. In a pilot study and clinical evaluation project, the program was found to be useful for patient education and feasible for implementation. Larger randomized trials are now warranted to evaluate the effectiveness of the intervention in improving compliance with the self-care regimen and thereby improving outcomes among patients with heart failure.
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Affiliation(s)
- S J Bennett
- School of Nursing, Indiana University, Indianapolis, USA
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Abstract
BACKGROUND The troublesome symptoms experienced by patients with chronic heart failure are associated with diminished quality of life, frequent hospitalizations, and mortality. OBJECTIVES To describe the symptoms experienced by patients with heart failure, to detail the self-care strategies used by these patients in managing their symptoms, and to categorize the self-care strategies. METHODS Six focus groups were used with 23 patients who had heart failure, along with six focus groups with 18 family members of the patients. Data analysis was performed by transcription of audiotape recordings of the group sessions and review of field notes. RESULTS The patients reported a large number of troublesome symptoms, many consistent with past empirical findings, but some not reported in previous studies. Self-care strategies to manage the symptoms clustered into 11 categories. CONCLUSIONS Results from this study provided direction for future studies to (a) identify the prevalence, severity, and etiologies of the commonly reported symptoms, particularly cognitive impairment, loss of balance, and depression; (b) evaluate the emotions reported by women with heart failure; and (c) test the strategies as part of an intervention program to improve symptom management in patients with heart failure.
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Affiliation(s)
- S J Bennett
- Adult Health Department, Indiana University School of Nursing, Indianapolis 46202, USA
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Abstract
Urethral diverticula are a common cause of chronic genitourinary symptoms in women. They occur in three percent of women overall with higher frequencies in selected populations of symptomatic women. The peak incidence is between the ages of 25-45 but they affect all ages. The classical presentation is with recurrent urinary tract infections and post micturition dribbling but almost any urinary symptom may be a presenting feature. Reported cure rates following surgery approach 70% for recurrent urinary tract infection and almost 100% for local symptoms such as dyspareunia. However, despite this and the availability of effective diagnostic techniques diagnosis is often delayed. This is partly due to a lack of awareness among clinicians and partly because the condition overlaps the traditional territories of gynaecologists and urologists.
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Affiliation(s)
- S J Bennett
- Senior Registrar, Dept. Obstetrics and Gynaecology, Leicester Royal Infirmary, Leicester, UK
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Abstract
A pre-exposure, exposure, post-exposure design was used to assess the adaptation of the timing of a one-handed catch during telestereoscopic viewing. More specifically, it was examined whether the adaptation involved: (1) ignoring binocular sources of information and selecting other information, or (2) a recalibration of the coupling between the effected binocular information and the catching movement, and (3), if it is recalibration, whether it is restricted to the manipulated binocular information. To test these hypotheses, subjects (n=16) were assigned to one of two groups, each group performing three blocks of 15 trials in the dark with only the ball visible. In the exposure condition, both groups were required to catch balls under binocular telestereoscopic viewing. In the pre-exposure and post-exposure conditions, subjects performed under binocular and monocular viewing, respectively. Kinematics of the grasping movement were recorded. It was predicted that, in the case of a selection process, no after effects would occur in the post-exposure condition, whereas, in the case of recalibration, aftereffects would occur. Moreover, if the recalibration is restricted to the manipulated information, only the group that was provided with binocular vision during the pre- exposure and post-exposure conditions would show aftereffects. Significant condition (pre-exposure, exposure, post-exposure) by block (first three trials, last three trials) effects were found for the moments of grasp onset, peak opening velocity and hand closure, indicating that the hand was opened and closed earlier in the first three trials of telestereoscopic viewing. This coincided with an increase in catching failures. In addition, for the moments of hand closure and peak closing velocity, negative aftereffects were found in the post-exposure condition. The hand was closed later in the first three trials after removal of telestereoscope. With respect to the presence of the aftereffects, no differences were found between the groups. It was concluded that adaptation to telestereoscopic viewing in the timing of a one-handed catch is due to the recalibration of the coupling between information and movement, rather than a selection of another source of information. Moreover, it is likely that the recalibration was not restricted to the single, manipulated information. Rather, the recalibration involves multiple binocular and monocular optical and oculomotor sources of information.
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Affiliation(s)
- J van der Kamp
- Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9, 1081 BT Amsterdam, Amsterdam, The Netherlands,
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Abstract
BACKGROUND: Dyspnea, or difficult breathing, is common in patients receiving mechanical ventilation; however, dyspnea is not routinely or systematically measured. OBJECTIVE: The primary purpose of this methodological study was to evaluate the test-retest reliability of 5 dyspnea rating scales and the criterion validity of 4 dyspnea rating scales in patients receiving mechanical ventilation. The secondary purpose was to examine the correlations between each of these 5 rating scales and physiological measures of respiratory function. METHODS: The convenience sample consisted of 28 patients on mechanical ventilation during their hospitalization in the intensive care units of a large, inner-city hospital. Patients rated their dyspnea twice at 30-minute intervals on the visual analogue scale, the vertical analogue dyspnea scale, the modified Borg scale, the numerical scale, and the faces scale. Test-retest reliability was computed by using the intraclass correlation coefficient. Criterion validity was evaluated by using the Spearman rank-order correlation coefficient. RESULTS: The 5 rating scales had acceptable test-retest reliabilities, with intraclass correlation coefficients ranging from 0.81 to 0.97. Criterion validity of the 4 scales also was acceptable, with Spearman rank-order correlation coefficients from 0.76 to 0.96. The rating scales were not correlated with most of the physiological variables. At least half of the patients reported moderate to severe dyspnea. CONCLUSION: The scales showed acceptable reliability and validity, and they will be useful in quantifying dyspnea experienced by patients receiving mechanical ventilation. Further work is needed to evaluate the extent and the severity of dyspnea in such patients in order to evaluate the effectiveness of interventions.
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Powers J, Bennett SJ. Measurement of dyspnea in patients treated with mechanical ventilation. Am J Crit Care 1999; 8:254-61. [PMID: 10392226] [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: 02/13/2023]
Abstract
BACKGROUND Dyspnea, or difficult breathing, is common in patients receiving mechanical ventilation; however, dyspnea is not routinely or systematically measured. OBJECTIVE The primary purpose of this methodological study was to evaluate the test-retest reliability of 5 dyspnea rating scales and the criterion validity of 4 dyspnea rating scales in patients receiving mechanical ventilation. The secondary purpose was to examine the correlations between each of these 5 rating scales and physiological measures of respiratory function. METHODS The convenience sample consisted of 28 patients on mechanical ventilation during their hospitalization in the intensive care units of a large, inner-city hospital. Patients rated their dyspnea twice at 30-minute intervals on the visual analogue scale, the vertical analogue dyspnea scale, the modified Borg scale, the numerical scale, and the faces scale. Test-retest reliability was computed by using the intraclass correlation coefficient. Criterion validity was evaluated by using the Spearman rank-order correlation coefficient. RESULTS The 5 rating scales had acceptable test-retest reliabilities, with intraclass correlation coefficients ranging from 0.81 to 0.97. Criterion validity of the 4 scales also was acceptable, with Spearman rank-order correlation coefficients from 0.76 to 0.96. The rating scales were not correlated with most of the physiological variables. At least half of the patients reported moderate to severe dyspnea. CONCLUSION The scales showed acceptable reliability and validity, and they will be useful in quantifying dyspnea experienced by patients receiving mechanical ventilation. Further work is needed to evaluate the extent and the severity of dyspnea in such patients in order to evaluate the effectiveness of interventions.
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Affiliation(s)
- J Powers
- Clarian Health Partners, Methodist Hospital, Indianapolis, Ind., USA
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Bennett SJ, Saywell RM, Zollinger TW, Huster GA, Ford CE, Pressler ML. Cost of hospitalizations for heart failure: sodium retention versus other decompensating factors. Heart Lung 1999; 28:102-9. [PMID: 10076109 DOI: 10.1053/hl.1999.v28.a96420] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [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: 11/11/2022]
Abstract
OBJECTIVE To determine the cost of heart failure-related hospital admissions and to compare the cost of admissions for sodium retention with the cost of admissions for other decompensating factors. DESIGN Retrospective, non-experimental, cost analysis. SETTING Midwestern university-affiliated, tertiary care, medical center. SAMPLE Two hundred seven heart failure-related admissions, 117 (57%) of which were for sodium retention leading to volume overload. OUTCOME MEASURES Cost of hospitalization. PROCEDURE Data obtained from the patient and financial records of patients hospitalized for heart failure in 1992 were analyzed using the ratio of cost-to-charge accounting procedure. RESULTS The total cost was $2,442,720 for the 207 heart failure-related admissions; the average cost was $12,400 per admission. Approximately half of the cost of the hospitalizations was expended in the 4 cost centers comprising routine and critical care services, which incorporate room charges and nursing care. Another one third of the cost was for supplies, medications, and laboratory tests. Admissions as a result of sodium retention had lower costs than admissions as a result of other factors. CONCLUSION The cost of hospitalization for heart failure is high. Routine services, supplies, medications, and laboratory tests used by these patients contribute to the high cost of care. Improved outpatient management strategies are necessary to reduce hospital admissions as a result of sodium retention.
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Calman KC, Temple JG, Naysmith R, Cairncross RG, Bennett SJ. Reforming higher specialist training in the United Kingdom--a step along the continuum of medical education. Med Educ 1999; 33:28-33. [PMID: 10211274 DOI: 10.1046/j.1365-2923.1999.00356.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
OBJECTIVES The requirement to align the arrangements for postgraduate training in the United Kingdom with those elsewhere in the European Community provided the opportunity to review and reform our arrangements for higher specialist training. This paper describes the case for change--the strengths and deficiencies of the traditional pattern of postgraduate medical training, demographic influences in the medical workforce and the need for a more structural or planned approach to training. CONCLUSIONS Over the past 5 years substantial progress has been made: the introduction of new regulatory arrangements and a new higher specialist training grade; the development of a managed and flexible system for delivering training to standards set by the Royal Colleges and which can accommodate the needs of those pursuing academic and research medicine; and the opportunity for trainees' progress to be measured against published curricula. The significant programme of change has been underpinned by careful workforce planning and the publication of comprehensive guidance. Significant reform of higher specialist training has been achieved. This paper also makes the case for a more strategic approach to planning and developing medical education across the continuum, from entry to medical school until retirement, which can guide medical education and improve patient care into the next millennium.
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Bennett SJ. Ecotypic variation between and within two populations of Trifolium tomentosum (woolly clover) from Syria and Western Australia: its success as a colonising species. ACTA ACUST UNITED AC 1999. [DOI: 10.1071/ar99024] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Ecotypic variation was studied between and within populations of
Trifolium tomentosum (woolly clover) using seed that was
collected from 2 semi-arid environments: Tel Hadya, Syria, and Pingrup,
Western Australia. The seed was collected from 64 subplots within a
40-m2 grid at each site and the material was grown at
the University of Western Australia Field Station at Shenton Park, Perth.
Fifteen morphological characters were scored and were analysed using analysis
of variance, principal components analysis, and discriminant function
analysis. Material from the 2 sites was separated using multivariate analysis,
with the seed from Tel Hadya containing more within-site variation. It is
suggested that the lack of within-site variation observed at Pingrup is the
result of a number of factors: a limited amount of genetic diversity being
present in the original introduced material, a preference of
T. tomentosum for alkaline soils rather than the acid
soils predominantly occurring in Western Australia, the harsh selection
pressures present in a semi-arid environment, and a limited time for genotypes
to adapt to specific micro-niches within each environment. The results are
used to contribute to our understanding of the success of colonising species
in semi-arid environments.
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Abstract
Persons with heart failure (HF) experience impaired quality of life (QOL). However, the majority of research conducted on QOL in persons with HF has been with men. The purpose of this descriptive pilot study was to describe the impact of symptoms of HF and examine the relationships among symptom impact, perceived health status, perceived social support, and overall QOL in 30 women who had recently been hospitalized for HF. The women reported high physical symptom impact, poor perceived physical health status, and impaired QOL. Physical symptom impact, perceived physical health status, and QOL were moderately to highly correlated with one another. Perceived social support was significantly, though not strongly, correlated with physical symptom impact. Emotional symptom impact and mental health status were significantly and negatively correlated with each other but were not significantly correlated with QOL. In this group of 30 chronically ill women, QOL was lower in those women who reported greater physical symptom impact and poorer perceptions of their physical health status.
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Affiliation(s)
- S J Bennett
- Indiana University School of Nursing, Indianapolis 46202, USA.
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Bennett SJ, Huster GA, Baker SL, Milgrom LB, Kirchgassner A, Birt J, Pressler ML. Characterization of the precipitants of hospitalization for heart failure decompensation. Am J Crit Care 1998; 7:168-74. [PMID: 9579241] [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: 02/07/2023]
Abstract
BACKGROUND The model for management of patients with heart failure may be a key determinant of morbidity and quality of life. Development of a better management strategy for these patients requires determination of the reasons for decompensation that leads to hospitalization. OBJECTIVES To ascertain and rank the principal reasons for hospitalization of patients who have heart failure. METHODS Retrospective audit of all 1992 admissions (N = 1031; 691 patients) coded for heart failure at a Veterans Affairs medical center and a tertiary care university medical center. RESULTS The diagnosis of heart failure was verified by preset criteria in 72% of the patients. Of the 496 patients with documented heart failure, worsening heart failure was a main reason for admission in 390 (79%). Despite different socioeconomic backgrounds, excessive sodium retention was the leading factor (55%) associated with decompensation in patients at both institutions. Other factors precipitated admission much less often. CONCLUSIONS Many hospitalizations for heart failure might be avoided by case management directed at lessening sodium overload. Increased use of medications known to be effective in persons with heart failure (angiotensin-converting enzyme inhibitors, digoxin, and adequate diuretic therapy) might reduce the likelihood of decompensation. Implementation of behavioral interventions to assist patients with self-monitoring signs of sodium retention and to improve compliance with medications and dietary sodium restrictions are strategies for further reducing the risk of decompensation.
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Affiliation(s)
- S J Bennett
- Indiana University School of Nursing, Indianapolis, USA
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Bennett SJ, Huster GA, Baker SL, Milgrom LB, Kirchgassner A, Birt J, Pressler ML. Characterization of the precipitants of hospitalization for heart failure decompensation. Am J Crit Care 1998. [DOI: 10.4037/ajcc1998.7.3.168] [Citation(s) in RCA: 166] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
BACKGROUND: The model for management of patients with heart failure may be a key determinant of morbidity and quality of life. Development of a better management strategy for these patients requires determination of the reasons for decompensation that leads to hospitalization. OBJECTIVES: To ascertain and rank the principal reasons for hospitalization of patients who have heart failure. METHODS: Retrospective audit of all 1992 admissions (N = 1031; 691 patients) coded for heart failure at a Veterans Affairs medical center and a tertiary care university medical center. RESULTS: The diagnosis of heart failure was verified by preset criteria in 72% of the patients. Of the 496 patients with documented heart failure, worsening heart failure was a main reason for admission in 390 (79%). Despite different socioeconomic backgrounds, excessive sodium retention was the leading factor (55%) associated with decompensation in patients at both institutions. Other factors precipitated admission much less often. CONCLUSIONS: Many hospitalizations for heart failure might be avoided by case management directed at lessening sodium overload. Increased use of medications known to be effective in persons with heart failure (angiotensin-converting enzyme inhibitors, digoxin, and adequate diuretic therapy) might reduce the likelihood of decompensation. Implementation of behavioral interventions to assist patients with self-monitoring signs of sodium retention and to improve compliance with medications and dietary sodium restrictions are strategies for further reducing the risk of decompensation.
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Bennett SJ, Pressler ML, Hays L, Firestine LA, Huster GA. Psychosocial variables and hospitalization in persons with chronic heart failure. Prog Cardiovasc Nurs 1998; 12:4-11. [PMID: 9433728] [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: 02/05/2023]
Abstract
Persons with chronic heart failure (HF) must cope not only with the physical impairment of their disease but with the associated emotional distress. The primary purpose of this prospective study was to examine whether the psychosocial variables of symptom impact measured at baseline--health perception, social support and coping--differed between a group of adults with chronic HF who were hospitalized and a group who were not hospitalized during the following six months of the study. A secondary purpose was to examine indices of left ventricular dysfunction that might influence hospitalization. Within the six-month period following baseline data collection, 23 of 62 (37%) patients who completed the study were hospitalized at least once for problems pertaining to HF. Patients in the hospitalized group reported significantly more baseline symptom impact, particularly in the areas of emotional symptoms and deficits of attention and memory. Social support and coping did not differ significantly between hospitalized and nonhospitalized patients. Extent of myocardial dysfunction, age and demographic variables were not significantly different between the two groups. Heart failure decompensation requiring inpatient management was presaged by increased anxiety and disorders of mentation, suggesting that health care providers need to be sensitive to these reported symptoms and their impact, because they might be clues to impending hospitalization.
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Affiliation(s)
- S J Bennett
- Indiana University School of Nursing, Indianapolis 46202, USA
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Bennett SJ, Milgrom LB, Champion V, Huster GA. Beliefs about medication and dietary compliance in people with heart failure: an instrument development study. Heart Lung 1997; 26:273-9. [PMID: 9257137 DOI: 10.1016/s0147-9563(97)90084-4] [Citation(s) in RCA: 54] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Sodium retention is often a precursor to hospitalization in people with heart failure (HF). Lack of compliance with medications and with dietary sodium restrictions affects sodium retention. OBJECTIVES The purpose of this study was to evaluate the reliability and validity of the Beliefs about Medication Compliance Scale and the Beliefs about Dietary Compliance Scale. METHODS The Beliefs about Medication Compliance Scale and the Beliefs about Dietary Compliance Scale are instruments we developed specifically to measure beliefs about compliance with behaviors that affect sodium retention in persons with HF. The scales, based on the Health Belief Model, were designed from a review of literature and from self-reports of people with HF. A convenience sample of 101 people with HF completed the scales. RESULTS Internal consistency reliability was satisfactory. Factor analysis provided initial support for construct validity of the scales. CONCLUSIONS Future testing of the scales is needed in more diverse populations. The scales can then be used to test interventions tailored to individual subjects' beliefs about compliance.
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Affiliation(s)
- S J Bennett
- Indiana University, School of Nursing, Indianapolis 46202, USA
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Bennett SJ. Genetic variation between and within two populations of Trifolium glomeratum (cluster clover) in Western Australia. ACTA ACUST UNITED AC 1997. [DOI: 10.1071/a96158] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Genetic variation between and within populations of
Trifolium glomeratum (cluster clover) was studied using
seed collected from 2 sites in Western Australia: Mount Barker in the south
and Kwelkan in the wheatbelt. Seed was collected at 64 subplots within each
site and the material was grown at the University Field Station at Shenton
Park, Perth. Seventeen morphological characters were scored and the results
were analysed using analysis of variance, principal components analysis, and
cluster analysis. Within-site variation was much greater than had previously
been shown, and a considerable amount of between-site variation was present.
It is suggested that within-site variation is due to a small amount of
heterozygosity, as a result of limited outbreeding, being present in each
population. The 2 populations are shown to be distinct from each other, with
the population from Mount Barker containing more within-site variation. It is
suggested that this is a result of climatic stress influencing and reducing
the amount of variation being maintained in the Kwelkan population.
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Abstract
The purpose of this study was to evaluate the reliability and validity of the Cardiac Event Threat Questionnaire (CTQ). The CTQ is a 31-item instrument specific for cardiac events that was developed from a literature review and self-reports of persons who had experienced a recent cardiac event. A convenience sample (N = 270) of persons hospitalized for angina, myocardial infarction, or cardiac surgery completed the CTQ. Satisfactory internal consistency and test-retest reliabilities were found. Results of confirmatory factor analysis and correlation with the Profile of Mood States provide initial support for construct validity of the CTQ.
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Affiliation(s)
- S J Bennett
- Department of Nursing of Adults, Indiana University School of Nursing, Indianapolis, USA
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Murphy AS, Bennett SJ, Clarke NM, Curtis N, Freer M, Fulton BR, Hall SJ, Leddy MJ, Murgatroyd JT, Pople JS, Tungate G, Ward RP, Rae WD, Simmons PM, Catford WN, Gyapong GJ, Singer SM, Chappell SP, Fox SP, Jones CD, Lee P, Watson DL. Search for 16O+16O+16O structure in 48Cr. Phys Rev C Nucl Phys 1996; 53:1963-1966. [PMID: 9971155 DOI: 10.1103/physrevc.53.1963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Tiede MA, Kemper KW, Fletcher NR, Robson D, Caussyn DD, Bennett SJ, Brown JD, Catford WN, Jones CD, Watson DL, Rae WD. Measurement of low-lying states in 9B. Phys Rev C Nucl Phys 1995; 52:1315-1325. [PMID: 9970636 DOI: 10.1103/physrevc.52.1315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Jarvis NS, Watson DL, Gyapong GJ, Jones CD, Bennett SJ, Freer M, Fulton BR, Karban O, Murgatroyd JT, Tungate G, Rae WD, Smith AE. Breakup studies with 23Na. Phys Rev C Nucl Phys 1995; 51:2606-2610. [PMID: 9970344 DOI: 10.1103/physrevc.51.2606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Murgatroyd JT, Bennett SJ, Fulton BR, Pople JS, Jarvis NS, Watson DL, Rae WD, Chan Y, DiGregorio D, Scarpaci J, Stokstad RG. Evidence for 16O+12C cluster structure in 28Si. Phys Rev C Nucl Phys 1995; 51:2230-2232. [PMID: 9970295 DOI: 10.1103/physrevc.51.2230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bennett SJ, Pressler ML. Reconciling quality of life and beneficence in nursing practice: chronic dobutamine infusion in endstage heart failure--a case study. Heart Lung 1995; 24:163-5. [PMID: 7759276 DOI: 10.1016/s0147-9563(05)80011-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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)
- S J Bennett
- Indiana University School of Nursing, Krannert Institute of Cardiology, Indianapolis, USA
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Abstract
Selected theoretical relationships from Lazarus' (1966) model of stress were tested in a convenience sample of 81 postmyocardial infarction clients. Two hypothesized causal models were analyzed. Results from regression analyses indicated 63% of the variance in coping effectiveness was explained by marital status, length of time since hospitalization, perceived availability of social support, uncertainty, degree of threat, coping strategies, and emotions. A revised model that fit the data was proposed. Findings indicated that emotions were an outcome of threat, not coping; threat did not directly affect coping strategies; and coping strategies did not directly influence coping effectiveness.
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Affiliation(s)
- S J Bennett
- School of Nursing, Indiana University, Indianapolis
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Bennett SJ, Waterstone JJ, Cheng WC, Parsons J. Complications of transvaginal ultrasound-directed follicle aspiration: a review of 2670 consecutive procedures. J Assist Reprod Genet 1993; 10:72-7. [PMID: 8499683 DOI: 10.1007/bf01204444] [Citation(s) in RCA: 153] [Impact Index Per Article: 4.9] [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: 01/31/2023] Open
Abstract
PURPOSE Complications following transvaginal ultrasound-directed follicle aspiration are rare, making it difficult to assess their true incidence. During a 4-year prospective study the complications arising from a series of 2670 consecutive procedures were monitored. RESULTS Vaginal hemorrhage occurred in 229 (8.6%) of the cases, with a significant loss (> 100 ml) in 22 (0.8%). Postoperative pelvic infection occurred in 18 (0.6%) of the cases. Hemorrhage from the ovary with hemoperitoneum formation was seen on two occasions and necessitated emergency laparotomy in one instance. A single case of pelvic haematoma formation from a punctured iliac vessel was also recorded; this settled without intervention. Of the 18 cases with infection, 9 were severe with pelvic abscess formation; microbiological examination of the pus from these cases suggests that the most common route of infection in such cases is probably by direct inoculation of vaginal organisms into the peritoneal cavity by the collecting needle. CONCLUSION The low incidence of pelvic infection questions the value of using prophylactic antibiotics. No increased risk of infection was demonstrated in cases with preexisting peritoneal damage.
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Affiliation(s)
- S J Bennett
- Assisted Conception Unit, King's College Hospital, London, UK
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Abstract
Osteoporosis is a serious health hazard mainly affecting postmenopausal and elderly women. Osteoporotic fractures are one of the leading causes of morbidity and death in the elderly population. Prevention of further loss of bone mass in postmenopausal women can be achieved if women take estrogen replacement therapy, consume adequate levels of calcium, exercise regularly, and practice healthy lifestyle behaviors. Elderly women need to follow the same strategies as postmenopausal women with more emphasis on prevention of falls.
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Bennett SJ. Perceived threats of individuals recovering from myocardial infarction. Heart Lung 1992; 21:322-6. [PMID: 1629000] [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: 12/28/2022]
Abstract
Lazarus' phenomenological theory of stress and coping provided the basis for this descriptive study of perceived threats after myocardial infarction (MI). Sixty-four post-MI subjects enrolled in phase II cardiac rehabilitation programs identified threats they had experienced in the past month. Perceived threats were defined as situations that were difficult or troubling to the individual and were described by respondents in narrative form. Degree of threat was then measured by one item on which subjects indicated the degree of concern the threatening event had caused them. Responses to the one item were analyzed and categorized into the following five areas: physical problems; medical therapy/self-care; work/physical activity; interpersonal/family; and financial. The results provide an overview of the multiple concerns individuals deal with after a major life-threatening cardiac event.
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Affiliation(s)
- S J Bennett
- Indiana University Medical Center, School of Nursing, Indianapolis 46202
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Abstract
OBJECTIVE The purpose of this study was to assess the motility of human sperm incubated with various concentrations of lignocaine. METHODS Eleven semen samples with a sperm density greater than or equal to 20 x 10(6) ml and progressive motility greater than or equal to 40% were prepared using a swim-up technique. Aliquots from each sample were incubated for 4 hr under capacitating conditions with lignocaine concentrations of 100, 10, 1, and 0.1 microgram/ml and without additional lignocaine as a control. Digital computerized motion analysis was performed on all samples at 1, 2, and 4 hr after the addition of lignocaine. RESULTS After 2 hr of incubation a significant (P less than 0.05) increase in the percentage of sperm with a curvilinear velocity greater than 100 microns/sec was observed in those samples incubated with 100 micrograms/ml lignocaine. This stimulatory effect was no longer apparent after a further 2 hr of incubation. No other significant changes were identified in any of the motility parameters examined. CONCLUSIONS No adverse effects on human sperm motility were identified during incubation with low concentrations of lignocaine. A transient stimulatory effect was observed at a lignocaine concentration of 100 micrograms/ml.
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Affiliation(s)
- S J Bennett
- Assisted Conception Unit, King's College Hospital, London, UK
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