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Henry A, Whitehead S, Mehra P. Decreasing Opioid Usage during Hospitalization in Patients Undergoing Orthognathic Surgery. J Oral Maxillofac Surg 2020. [DOI: 10.1016/j.joms.2020.07.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chadwick K, Whitehead S, Ford C, Gama R. Verification of the BioPorto and Abbott NGAL assays on the Abbott Architect. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Whitehead S, Singham B, Jayaraman R, Ford C, Gama R. Failure to thrive with severe hyponatraemia and hyperkalaemia: The role of clinical validation in reaching a diagnosis. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Whitehead S, Ford C, Gama R. Reliable detection of kEDTA sample contamination requires a routine EDTA assay. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.1522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Whitehead S, Chadwick K, Ford C, Gama R. kEDTA sample contamination: A reappraisal. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.1551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Karimi S, Karimi S, Kaiser R, Cobbs E, Lepcha N, Whitehead S. Teaming up to Reduce Catheter-Associated Urinary Tract Infections. J Am Med Dir Assoc 2019. [DOI: 10.1016/j.jamda.2019.01.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Whitehead S, Cambridge ML, Renton M. A functional-structural model of ephemeral seagrass growth influenced by environment. ANNALS OF BOTANY 2018; 121:897-908. [PMID: 29370337 PMCID: PMC5906912 DOI: 10.1093/aob/mcx156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 10/23/2017] [Indexed: 05/12/2023]
Abstract
Background and Aims Ephemeral seagrasses that respond rapidly to environmental changes are important marine habitats. However, they are under threat due to human activity and are logistically difficult and expensive to study. This study aimed to develop a new functional-structural environmentally dependent model of ephemeral seagrass, able to integrate our understanding of ephemeral seagrass growth dynamics and assess options for potential management interventions, such as seagrass transplantation. Methods A functional-structural plant model was developed in which growth and senescence rates are mechanistically linked to environmental variables. The model was parameterized and validated for a population of Halophila stipulacea in the Persian Gulf. Key Results There was a good match between empirical and simulated results for the number of apices, net rhizome length or net number of internodes using a 330 d simulation. Simulated data were more variable than empirical data. Simulated structural patterns of seagrass rhizome growth qualitatively matched empirical observations. Conclusions This new model successfully simulates the environmentally dependent growth and senescence rates of our case-study ephemeral seagrass species. It produces numerical and visual outputs that help synthesize our understanding of how the influence of environmental variables on plant functional processes affects overall growth patterns. The model can also be used to assess the potential outcomes of management interventions like seagrass transplantation, thus providing a useful management tool. It is freely available and easily adapted for new species and locations, although validation with more species and environments is required.
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Mackay W, Whitehead S, Purdue N, Smith M, Redhead N, Williams C, Wilson S. Infection control implications of the laundering of ambulance staff uniforms and reusable mops. J Hosp Infect 2017; 96:59-62. [DOI: 10.1016/j.jhin.2017.02.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 02/17/2017] [Indexed: 11/26/2022]
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Pearce A, Batrum M, Lynam A, Whitehead S, Anderson R. 204 To eat or not to eat – a partnership approach to working with eating disorders within cystic fibrosis. J Cyst Fibros 2016. [DOI: 10.1016/s1569-1993(16)30443-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ong LP, Tristan Z, Muse H, Wallace K, Whitehead S, Parry G, Clark S. 248 * BLOOD TRANSFUSION AFTER LUNG TRANSPLANTATION: IMPACT ON EARLY FUNCTION AND SURVIVAL. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.248] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Zatta AJ, McQuilten ZK, Mitra B, Roxby DJ, Sinha R, Whitehead S, Dunkley S, Kelleher S, Hurn C, Cameron PA, Isbister JP, Wood EM, Phillips LE. Elucidating the clinical characteristics of patients captured using different definitions of massive transfusion. Vox Sang 2014; 107:60-70. [PMID: 24697251 DOI: 10.1111/vox.12121] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 11/05/2013] [Accepted: 11/06/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND AND OBJECTIVES The type and clinical characteristics of patients identified with commonly used definitions of massive transfusion (MT) are largely unknown. The objective of this study was to define the clinical characteristics of patients meeting different definitions of MT for the purpose of patient recruitment in observational studies. MATERIALS AND METHODS Data were extracted on all patients who received red blood cell (RBC) transfusions in 2010 at three tertiary Australian hospitals. MT patients were identified according to three definitions: ≥10 units RBC in 24 h (10/24 h), ≥6 units RBC in 6 h (6/6 h) and ≥5 units RBC in 4 h (5/4 h). Clinical coding data were used to assign bleeding context. Data on in-hospital mortality were also extracted. RESULTS Five hundred and forty-two patients met at least one MT definition, with 236 (44%) included by all definitions. The most inclusive definition was 5/4 h (508 patients, 94%) followed by 6/6 h (455 patients, 84%) and 10/24 h (251 patients, 46%). Importantly, 40-55% of most types of critical bleeding events and 82% of all obstetric haemorrhage cases were excluded by the 10/24 h definition. Patients who met both the 5/4 h and 10/24 h definitions were transfused more RBCs (19 vs. 8 median total RBC units; P < 0·001), had longer ventilation time (120 vs. 55 h; P < 0·001), median ICU (149 vs. 99 h; P < 0·001) and hospital length of stay (23 vs. 18 h; P = 0·006) and had a higher in-hospital mortality rate (23·3% vs. 16·4%; P = 0·050). CONCLUSION The 5/4 h MT definition was the most inclusive, but combination with the 10/24 h definition appeared to identify a clinically important patient cohort.
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McNally DS, Whitehead S. A computational simulation study of the influence of helmet wearing on head injury risk in adult cyclists. ACCIDENT; ANALYSIS AND PREVENTION 2013; 60:15-23. [PMID: 24005027 DOI: 10.1016/j.aap.2013.07.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 02/18/2013] [Accepted: 07/10/2013] [Indexed: 06/02/2023]
Abstract
Evidence for the effectiveness of cycle helmets has relied either on simplified experiments or complex statistical analysis of patient cohorts or populations. This study directly assesses the effectiveness of cycle helmets over a range of accident scenarios, from basic loss of control to vehicle impact, using computational modelling. Simulations were performed using dynamics modelling software (MADYMO) and models of a 50% Hybrid III dummy, a hybrid cross bicycle and a car. Loss of control was simulated by a sudden turn of the handlebars and striking a curb, side and rear-on impacts by a car were also simulated. Simulations were run over a representative range of cycle speeds (2.0-14.0 m s(-1)) and vehicle speeds (4.5-17.9 m s(-1)). Bicycle helmets were found to be effective in reducing the severity of head injuries sustained in common accidents. They reduced the risk of an AIS>3 injury, in cases with head impacts, by an average of 40%. In accidents that would cause up to moderate (AIS=2) injuries to a non-helmeted rider, helmets eliminated the risk of injury. Helmets were also found to be effective in preventing fatal head injuries in some instances. The effectiveness of helmets was demonstrated over the entire range of cycle speeds studied, up to and including 14 m s(-1). There was no evidence that helmet wearing increased the risk of neck injury, indeed helmets were found to be protective of neck injuries in many cases. Similarly, helmets were found to offer an increase in protection even when an increase in cycle speed due to risk compensation was taken into consideration.
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Miller K, Akers C, Magrin G, Whitehead S, Davis AK. Piloting the use of 2D barcode and patient safety-software in an Australian tertiary hospital setting. Vox Sang 2013; 105:159-66. [PMID: 23600799 DOI: 10.1111/vox.12034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2012] [Revised: 02/16/2013] [Accepted: 02/19/2013] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Errors in administration of blood products can lead to poor patient outcomes including fatal ABO incompatible transfusions. This pilot study sought to establish whether the use of two-dimensional (2D) barcode technology combined with patient identification software designed to assist in blood administration improves the bedside administration of transfusions in an Australian tertiary hospital. STUDY DESIGN AND METHODS The study was conducted in a Haematology/Oncology Day Clinic of a major metropolitan hospital, to evaluate the use of 2D barcode technology and patient safety-software and hand-held PDAs to assist nursing staff in patient identification and blood administration. Comparative audits were conducted before and after the technology's implementation. RESULTS The preimplementation transfusion practice audits demonstrated a poor understanding of the blood checking process, with focus on the product rather than patient identification. Following the implementation of 2D barcode technology and patient safety-software, there was significant improvement in administration practice. Positive, verbal patient identification improved from 57% (51/90) to 94% (75/80). Similarly, the cross-referencing of the patient's identification with the patient's wristband improved from 36% (32/90) to 94% (75/80), and the cross-referencing of patient ID on the compatibility tag to wristbands improved from 48% (43/90) to 99% (79/80). Importantly, the 2D barcode technology and patient safety-software saw 100% (80/80) of checks being conducted at the patient bedside, compared with 76% (68/90) in the preimplementation audits. CONCLUSION This pilot study demonstrates that 2D barcode technology and patient safety-software significantly improves the bedside check of patient and blood product identification in an Australian setting.
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Taube MA, Freeman S, Lloyd S, Glynn F, Whitehead S, Wadeson A, Ramsden R, Rutherford S, King A. Growth Characteristics of Recurrent or Residual Sporadic Vestibular Schwannomas. Skull Base Surg 2012. [DOI: 10.1055/s-0032-1314150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Powell K, Han D, Hung N, Vu T, Sy D, Trinh T, Le T, Do K, Oeltmann J, Whitehead S. Prevalence and risk factors for tuberculosis infection among personnel in two hospitals in Viet Nam. Int J Tuberc Lung Dis 2011; 15:1643-9. [DOI: 10.5588/ijtld.11.0207] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Tran H, Collecutt M, Whitehead S, Salem HH. Prothrombin complex concentrates used alone in urgent reversal of warfarin anticoagulation. Intern Med J 2011; 41:337-43. [DOI: 10.1111/j.1445-5994.2010.02237.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Todd C, Yardley L, Ben-Shlomo Y, Whitehead S, Kirby S, Gilbert R. Are falls related to socio-demographic variables: a systematic review. Inj Prev 2010. [DOI: 10.1136/ip.2010.029215.623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Whitehead S. LXXXII.Dipoles in relation to the anomalous properties of dielectrics. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/14786443008565061] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Banks AN, Sanderson WG, Hughes B, Cranswick PA, Smith LE, Whitehead S, Musgrove AJ, Haycock B, Fairney NP. The Sea Empress oil spill (Wales, UK): effects on Common Scoter Melanitta nigra in Carmarthen Bay and status ten years later. MARINE POLLUTION BULLETIN 2008; 56:895-902. [PMID: 18331745 DOI: 10.1016/j.marpolbul.2008.01.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2007] [Revised: 01/21/2008] [Accepted: 01/22/2008] [Indexed: 05/26/2023]
Abstract
Carmarthen Bay, UK, regularly supports internationally important numbers (>16,000) of non-breeding Common Scoters Melanitta nigra. The spill of 72,000 tonnes of crude oil from the Sea Empress in 1996 affected birds both through direct mortality and likely pollution of key food resources. Numbers were greatly reduced following the spill, whilst changes in the distribution of birds within Carmarthen Bay suggested that potentially sub-optimal foraging zones were used. However, ten years after the incident, numbers of Common Scoter were no different to those recorded immediately before the spill. Compared to some other spills, rapid revival is evident. Numbers increased to pre-spill levels within three winters and distributional changes suggested a concurrent return to previously contaminated feeding areas, implying that the ecosystem had regenerated sufficiently to support its top predator. The importance of prolonged, standardised monitoring of bird numbers and distribution as indicators of ecological recovery from environmental damage is emphasised.
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Whitfield DP, Fielding AH, Whitehead S. Long-term increase in the fecundity of hen harriers in Wales is explained by reduced human interference and warmer weather. Anim Conserv 2008. [DOI: 10.1111/j.1469-1795.2008.00164.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sime D, Robertson P, Whitehead S, Inkster T. WITHDRAWN: Rapid culture of brucella melitensis from blood cultures. J Infect 2006. [DOI: 10.1016/j.jinf.2005.11.088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Jenkins V, Shilling V, Deutsch G, Bloomfield D, Morris R, Allan S, Bishop H, Hodson N, Mitra S, Sadler G, Shah E, Stein R, Whitehead S, Winstanley J. A 3-year prospective study of the effects of adjuvant treatments on cognition in women with early stage breast cancer. Br J Cancer 2006; 94:828-34. [PMID: 16523200 PMCID: PMC3216421 DOI: 10.1038/sj.bjc.6603029] [Citation(s) in RCA: 284] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The neuropsychological performance of 85 women with early stage breast cancer scheduled for chemotherapy, 43 women scheduled for endocrine therapy and/or radiotherapy and 49 healthy control subjects was assessed at baseline (T1), postchemotherapy (or 6 months) (T2) and at 18 months (T3). Repeated measures analysis found no significant interactions or main effect of group after controlling for age and intelligence. Using a calculation to examine performance at an individual level, reliable decline on multiple tasks was seen in 20% of chemotherapy patients, 26% of nonchemotherapy patients and 18% of controls at T2 (18%, 14 and 11%, respectively, at T3). Patients who had experienced a treatment-induced menopause were more likely to show reliable decline on multiple measures at T2 (OR=2.6, 95% confidence interval (CI) 0.823–8.266 P=0.086). Psychological distress, quality of life measures and self-reported cognitive failures did not impact on objective tests of cognitive function, but were significantly associated with each other. The results show that a few women experienced objective measurable change in their concentration and memory following standard adjuvant therapy, but the majority were either unaffected or even improve over time.
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Abstract
Acceptance of lower transfusion thresholds and shorter post-operative stays results in patients leaving hospital after surgery with lower haemoglobin (Hb) than previously. We undertook a prospective observational study to assess the haematological response to post-operative anaemia and to determine the utility of quality of life (QoL) measures in assessing the impact of anaemia on such patients. Thirty patients undergoing unilateral hip arthroplasty had blood samples taken and QoL questionnaires administered pre-operatively and at 7, 28 and 56 days post-operatively. Increased erythropoiesis was evident at day 7 post-operatively. Approximately two-thirds of the post-operative Hb deficit was corrected by day 28. There was evidence of functional iron deficiency in more than one-quarter of patients at day 56. QoL scores used did not show any relationship with Hb in the post-operative period. Red cell 2,3-diphosphoglycerate (2,3DPG) levels increased in proportion to the degree of post-operative anaemia. We concluded that substantial recovery of Hb occurs between day 7 and day 28 post-operatively. Complete recovery of Hb may be delayed beyond day 56 due to development of iron deficiency. Patients are at significant risk of developing post-operative iron deficiency depending on operative blood loss and pre-operative iron stores. Increased red cell 2,3DPG may offset the effect of anaemia on oxygen delivery. We found no evidence that anaemia produces a measurable effect on chosen QoL scores in the post-operative period.
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