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Hebert E, MacLeod J, Pozeg Z, McGrath B, Paddock V, Teskey R, Ferguson D, Archer B, Legare J, Leblanc H. TRENDS IN TRANSVALVULAR GRADIENTS OVER TIME IN PATIENTS RECEIVING TRANSCATHETER VALVES. Can J Cardiol 2021. [DOI: 10.1016/j.cjca.2021.07.204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Lees M, MacLeod J, Pozeg Z, McGrath B, Paddock V, Teskey R, Ferguson D, Archer B, Leblanc H, Legare J. IDENTIFYING PREDICTIVE RISK FACTORS FOR PACEMAKER NEED IN PATIENTS UNDERGOING TRANSCATHETER AORTIC VALVE REPLACEMENT. Can J Cardiol 2021. [DOI: 10.1016/j.cjca.2021.07.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Légaré JF, Hassan A, O'Brien A, Archer B, Ferguson D, Forgie R, Teskey R, McGrath B, Paddock V. Transfemoral Aortic Valve Replacement (TAVR): Is Incorporation of Interventional Radiologists into the Team Beneficial? Cardiovasc Intervent Radiol 2019; 42:1511-1512. [PMID: 31471719 DOI: 10.1007/s00270-019-02318-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 08/14/2019] [Accepted: 08/16/2019] [Indexed: 10/26/2022]
Affiliation(s)
- J F Légaré
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada. .,Cardiovascular Research New Brunswick, Saint John, NB, Canada. .,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada.
| | - A Hassan
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,Cardiovascular Research New Brunswick, Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
| | - A O'Brien
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
| | - B Archer
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
| | - D Ferguson
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
| | - R Forgie
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,Cardiovascular Research New Brunswick, Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
| | - R Teskey
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,Cardiovascular Research New Brunswick, Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
| | - B McGrath
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,Cardiovascular Research New Brunswick, Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
| | - V Paddock
- Dalhousie University Medicine (DMNB), Saint John, NB, Canada.,Cardiovascular Research New Brunswick, Saint John, NB, Canada.,The New Brunswick Heart Centre, 400 University Ave, Saint John, NB, E2L 4L2, Canada
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Legare J, Hassan A, Lutchmedial S, Yip A, MacLeod J, Leblanc H, Archer B, Ferguson D, Pelletier M, Forgie R, O'Brien A, Teskey R, Paddock V. HOW INTERVENTIONAL RADIOLOGY CAN ENHANCE THE PERFORMANCE OF A TAVI TEAM: NEW BRUNSWICK HEART CENTRE EXPERIENCE. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Melville S, Teskey R, Philip S, Simpson JA, Lutchmedial S, Brunt KR. A Comparison and Calibration of a Wrist-Worn Blood Pressure Monitor for Patient Management: Assessing the Reliability of Innovative Blood Pressure Devices. J Med Internet Res 2018; 20:e111. [PMID: 29695375 PMCID: PMC5943631 DOI: 10.2196/jmir.8009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 05/10/2017] [Revised: 11/10/2017] [Accepted: 11/16/2017] [Indexed: 01/09/2023] Open
Abstract
Background Clinical guidelines recommend monitoring of blood pressure at home using an automatic blood pressure device for the management of hypertension. Devices are not often calibrated against direct blood pressure measures, leaving health care providers and patients with less reliable information than is possible with current technology. Rigorous assessments of medical devices are necessary for establishing clinical utility. Objective The purpose of our study was 2-fold: (1) to assess the validity and perform iterative calibration of indirect blood pressure measurements by a noninvasive wrist cuff blood pressure device in direct comparison with simultaneously recorded peripheral and central intra-arterial blood pressure measurements and (2) to assess the validity of the measurements thereafter of the noninvasive wrist cuff blood pressure device in comparison with measurements by a noninvasive upper arm blood pressure device to the Canadian hypertension guidelines. Methods The cloud-based blood pressure algorithms for an oscillometric wrist cuff device were iteratively calibrated to direct pressure measures in 20 consented patient participants. We then assessed measurement validity of the device, using Bland-Altman analysis during routine cardiovascular catheterization. Results The precalibrated absolute mean difference between direct intra-arterial to wrist cuff pressure measurements were 10.8 (SD 9.7) for systolic and 16.1 (SD 6.3) for diastolic. The postcalibrated absolute mean difference was 7.2 (SD 5.1) for systolic and 4.3 (SD 3.3) for diastolic pressures. This is an improvement in accuracy of 33% systolic and 73% diastolic with a 48% reduction in the variability for both measures. Furthermore, the wrist cuff device demonstrated similar sensitivity in measuring high blood pressure compared with the direct intra-arterial method. The device, when calibrated to direct aortic pressures, demonstrated the potential to reduce a treatment gap in high blood pressure measurements. Conclusions The systolic pressure measurements of the wrist cuff have been iteratively calibrated using gold standard central (ascending aortic) pressure. This improves the accuracy of the indirect measures and potentially reduces the treatment gap. Devices that undergo auscultatory (indirect) calibration for licensing can be greatly improved by additional iterative calibration via intra-arterial (direct) measures of blood pressure. Further clinical trials with repeated use of the device over time are needed to assess the reliability of the device in accordance with current and evolving guidelines for informed decision making in the management of hypertension. Trial Registration ClinicalTrials.gov NCT03015363; https://clinicaltrials.gov/ct2/show/NCT03015363 (Archived by WebCite at http://www.webcitation.org/6xPZgseYS)
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Affiliation(s)
- Sarah Melville
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada.,Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada
| | - Robert Teskey
- Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada.,Department of Cardiology, Saint John Regional Hospital, Horizon Health Network, Saint John, NB, Canada
| | - Shona Philip
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada.,Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada
| | - Jeremy A Simpson
- Department of Human Health Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Sohrab Lutchmedial
- Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada.,Department of Cardiology, Saint John Regional Hospital, Horizon Health Network, Saint John, NB, Canada
| | - Keith R Brunt
- Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, NB, Canada.,Cardiovascular Research New Brunswick, New Brunswick Heart Centre, Saint John, NB, Canada.,Department of Cardiology, Saint John Regional Hospital, Horizon Health Network, Saint John, NB, Canada
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Salomón R, Valbuena-Carabaña M, Teskey R, McGuire MA, Aubrey D, González-Doncel I, Gil L, Rodríguez-Calcerrada J. Seasonal and diel variation in xylem CO2 concentration and sap pH in sub-Mediterranean oak stems. J Exp Bot 2016; 67:2817-2827. [PMID: 27012285 DOI: 10.1093/jxb/erw121] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Since a substantial portion of respired CO2 remains within the stem, diel and seasonal trends in stem CO2 concentration ([CO2]) are of major interest in plant respiration and carbon budget research. However, continuous long-term stem [CO2] studies are scarce, and generally absent in Mediterranean climates. In this study, stem [CO2] was monitored every 15min together with stem and air temperature, sap flow, and soil water storage during a growing season in 16 stems of Quercus pyrenaica to elucidate the main drivers of stem [CO2] at different temporal scales. Fluctuations in sap pH were also assessed during two growing seasons to evaluate potential errors in estimates of the concentration of CO2 dissolved in xylem sap ([CO2*]) calculated using Henry's law. Stem temperature was the best predictor of stem [CO2] and explained more than 90% and 50% of the variability in stem [CO2] at diel and seasonal scales, respectively. Under dry conditions, soil water storage was the main driver of stem [CO2]. Likewise, the first rains after summer drought caused intense stem [CO2] pulses, suggesting enhanced stem and root respiration and increased resistance to radial CO2 diffusion. Sap flow played a secondary role in controlling stem [CO2] variations. We observed night-time sap pH acidification and progressive seasonal alkalinization. Thus, if the annual mean value of sap pH (measured at midday) was assumed to be constant, night-time sap [CO2*] was substantially overestimated (40%), and spring and autumn sap [CO2*] were misestimated by 25%. This work highlights that diel and seasonal variations in temperature, tree water availability, and sap pH substantially affect xylem [CO2] and sap [CO2*].
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Affiliation(s)
- Roberto Salomón
- Forest Genetics and Ecophysiology Research Group, E.T.S. Forestry Engineering, Technical University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - María Valbuena-Carabaña
- Forest Genetics and Ecophysiology Research Group, E.T.S. Forestry Engineering, Technical University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Robert Teskey
- Warnell School of Forestry and Natural Resources, University of Georgia, 180 East Green St, Athens, GA 30602-2152, USA
| | - Mary Anne McGuire
- Warnell School of Forestry and Natural Resources, University of Georgia, 180 East Green St, Athens, GA 30602-2152, USA
| | - Doug Aubrey
- Warnell School of Forestry and Natural Resources, University of Georgia, 180 East Green St, Athens, GA 30602-2152, USA Savannah River Ecology Lab, University of Georgia, Drawer E, Aiken, SC 29802, USA
| | - Inés González-Doncel
- Forest Genetics and Ecophysiology Research Group, E.T.S. Forestry Engineering, Technical University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Luis Gil
- Forest Genetics and Ecophysiology Research Group, E.T.S. Forestry Engineering, Technical University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
| | - Jesús Rodríguez-Calcerrada
- Forest Genetics and Ecophysiology Research Group, E.T.S. Forestry Engineering, Technical University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
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White A, Hassan A, Yip A, Teskey R, Paddock V, Lutchmedial S. HOW DO DOOR TO EKG (D2EKG) AND DOOR TO NEEDLE (D2N) TIMES FOR NEW BRUNSWICK STEMI PATIENTS COMPARE TO CURRENT GUIDELINES? Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Teskey R, Wertin T, Bauweraerts I, Ameye M, McGuire MA, Steppe K. Responses of tree species to heat waves and extreme heat events. Plant Cell Environ 2015; 38:1699-712. [PMID: 25065257 DOI: 10.1111/pce.12417] [Citation(s) in RCA: 196] [Impact Index Per Article: 21.8] [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: 04/19/2014] [Revised: 07/08/2014] [Accepted: 07/10/2014] [Indexed: 05/05/2023]
Abstract
The number and intensity of heat waves has increased, and this trend is likely to continue throughout the 21st century. Often, heat waves are accompanied by drought conditions. It is projected that the global land area experiencing heat waves will double by 2020, and quadruple by 2040. Extreme heat events can impact a wide variety of tree functions. At the leaf level, photosynthesis is reduced, photooxidative stress increases, leaves abscise and the growth rate of remaining leaves decreases. In some species, stomatal conductance increases at high temperatures, which may be a mechanism for leaf cooling. At the whole plant level, heat stress can decrease growth and shift biomass allocation. When drought stress accompanies heat waves, the negative effects of heat stress are exacerbated and can lead to tree mortality. However, some species exhibit remarkable tolerance to thermal stress. Responses include changes that minimize stress on photosynthesis and reductions in dark respiration. Although there have been few studies to date, there is evidence of within-species genetic variation in thermal tolerance, which could be important to exploit in production forestry systems. Understanding the mechanisms of differing tree responses to extreme temperature events may be critically important for understanding how tree species will be affected by climate change.
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Affiliation(s)
- Robert Teskey
- Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, 30602, USA
| | - Timothy Wertin
- Institute for Genomic Biology, University of Illinois, Urbana, IL, 61801, USA
| | - Ingvar Bauweraerts
- Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, B-9000, Belgium
| | - Maarten Ameye
- Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, B-9000, Belgium
| | - Mary Anne McGuire
- Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, 30602, USA
| | - Kathy Steppe
- Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, B-9000, Belgium
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Pate GE, Lee M, Humphries K, Cohen E, Lowe R, Fox RS, Teskey R, Buller CE. Characterizing the spectrum of in-stent restenosis: implications for contemporary treatment. Can J Cardiol 2007; 22:1223-9. [PMID: 17151772 PMCID: PMC2569078 DOI: 10.1016/s0828-282x(06)70963-1] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
BACKGROUND Reports addressing treatment of in-stent restenosis (ISR) are principally derived from clinical trials. OBJECTIVES To characterize the spectrum of ISR in an unselected population, and to explore clinical and angiographic factors determining management. METHODS During a prespecified six-month period before the introduction of drug-eluting stents, consecutive cases of ISR that were identified during clinically driven cardiac catheterization at five hospitals offering all approved treatment modalities for ISR were prospectively registered. RESULTS ISR was identified in 363 patients; 301 (84%) had one ISR lesion and 62 (16%) had multiple lesions. Unstable clinical presentations accounted for 51%, including 15% with ST-elevation myocardial infarction. The median interval (25th, 75th percentiles) from stent insertion to angiographic diagnosis of ISR was eight months (Q1,Q3: 4,15), with a median stented length of 18 mm (Q1,Q3: 15,28). The majority of lesions (60%) displayed a diffuse ISR pattern (Mehran types 2 and 3). ISR type was independent of time to re-presentation, diabetes, arterial territory and total stent length. Treatment included percutaneous coronary intervention (PCI) alone (n=139 [38%]), PCI with brachytherapy (n=105 [29%]), medical therapy (n=60 [17%]) and coronary artery bypass graft surgery (n=59 [16%]). Medical therapy was associated with small vessel size and recurrent ISR, and coronary artery bypass graft surgery was associated with multiple lesions, as well as diffuse, occlusive and recurrent ISR. For patients treated percutaneously, PCI treatment alone was more common for focal restenosis and after ST-elevation myocardial infarction, and brachytherapy was the more common treatment for diffuse and recurrent ISR, and stable angina. CONCLUSIONS These data provide a benchmark description of the spectrum of ISR with which the impact of drug-eluting stents may be compared and better understood.
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Affiliation(s)
- Gordon E Pate
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia
| | - May Lee
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia
| | - Karin Humphries
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia
| | - Eric Cohen
- Schulich Heart Program, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario
| | - Robert Lowe
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia
| | - Rebecca S Fox
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia
| | - Robert Teskey
- Dalhousie University, Queen Elizabeth II Health Sciences Centre, Halifax, Nova Scotia
| | - Christopher E Buller
- Division of Cardiology, University of British Columbia, Vancouver, British Columbia
- Correspondence: Dr Christopher E Buller, Vancouver General Hospital, Diamond Health Care Centre, Level 9 Cardiology, 2775 Laurel Street, Vancouver, British Columbia V5Z 1M9. Telephone 604-806-8359, fax 604-806-8389, e-mail
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