1
|
Fahmi A, Garon M, Ribon-Demars A, Dubois L, Caouette M, Lamontagne MÈ, Beaulieu-Bonneau S. Learning to drive with neurological conditions: profile of users of an adapted driver training program and cognitive factors associated with success. Disabil Rehabil 2023:1-9. [PMID: 37728095 DOI: 10.1080/09638288.2023.2258332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 09/07/2023] [Indexed: 09/21/2023]
Abstract
PURPOSE To describe the sociodemographic and cognitive profile of participants enrolled in an adapted driving program for individuals with neurological conditions, to explore the association between cognitive functioning and driving program outcome, and to describe driving habits after program completion. METHODS This study combined retrospective chart review and cross-sectional data collection. RESULTS The sample included 71 participants with neurological disorders (aged 15-56 years, M = 22.2 ± 8.6; 39% women). Driving program was either successful (47%), failed (7%), discontinued (34%), or ongoing (13%). Among 35 participants with complete neuropsychological and driving program outcome data, those who successfully completed the program showed better attention functioning, and better performance relative to global functioning for attention, executive functions, and working memory, compared to those who discontinued/failed the program. Among 21 participants who completed a telephone questionnaire on average 3.7 years after program enrollment, 67% obtained their driver's license and drove regularly. Participants reported high levels of satisfaction with the program. CONCLUSION These results suggest that approximately half of the persons enrolled in a driver training program designed for learners with neurological conditions, obtain a driver's license; and that attention, and to a lesser extent executive functioning and working memory, are related to driving program success.IMPLICATIONS FOR REHABILITATIONIn individual with neurological conditions, learning how to drive can be challenging.An adapted driver training program, involving collaboration between driving instructors and healthcare professionals, simplification of theoretical learning, and increasing driving practice opportunities, can be effective, both in terms of licensing success and client satisfaction.Conducting a pre-driving program neuropsychological assessment, with identification of cognitive strengths and weaknesses, can provide valuable information for clinicians and driving instructors for optimizing training and predicting outcome.Better performance in attention, and better relative to global cognitive functioning in attention, executive functions, and working memory, are related to higher success rate of an adapted driving program.
Collapse
Affiliation(s)
- Adam Fahmi
- École de psychologie, Faculté des sciences sociales, Université Laval, Québec, QC, Canada
- Centre interdisciplinaire de recherche en réadaptation et intégration sociale (Cirris), Centre intégré universitaire de santé et de services sociaux de la Capitale-Nationale (CIUSSS-CN), Québec, QC, Canada
| | - Mathieu Garon
- Centre intégré universitaire de santé et de services sociaux de l'Estrie, Centre hospitalier universitaire de Sherbrooke; Sherbrooke, QC, Canada
| | - Alexandra Ribon-Demars
- Centre interdisciplinaire de recherche en réadaptation et intégration sociale (Cirris), Centre intégré universitaire de santé et de services sociaux de la Capitale-Nationale (CIUSSS-CN), Québec, QC, Canada
| | - Laurie Dubois
- École de psychologie, Faculté des sciences sociales, Université Laval, Québec, QC, Canada
- Centre interdisciplinaire de recherche en réadaptation et intégration sociale (Cirris), Centre intégré universitaire de santé et de services sociaux de la Capitale-Nationale (CIUSSS-CN), Québec, QC, Canada
| | - Martin Caouette
- Centre interdisciplinaire de recherche en réadaptation et intégration sociale (Cirris), Centre intégré universitaire de santé et de services sociaux de la Capitale-Nationale (CIUSSS-CN), Québec, QC, Canada
- Département de psychoéducation, Université du Québec à Trois-Rivières; Trois-Rivières, QC, Canada
| | - Marie-Ève Lamontagne
- Centre interdisciplinaire de recherche en réadaptation et intégration sociale (Cirris), Centre intégré universitaire de santé et de services sociaux de la Capitale-Nationale (CIUSSS-CN), Québec, QC, Canada
- École des sciences de la réadaptation, Faculté de médecine, Université Laval, Québec, QC, Canada
| | - Simon Beaulieu-Bonneau
- École de psychologie, Faculté des sciences sociales, Université Laval, Québec, QC, Canada
- Centre interdisciplinaire de recherche en réadaptation et intégration sociale (Cirris), Centre intégré universitaire de santé et de services sociaux de la Capitale-Nationale (CIUSSS-CN), Québec, QC, Canada
| |
Collapse
|
2
|
Fahmi A, Caouette M, Garon M, Ribon-Demars A, Pellerin S, Dubois L, Lamontagne MÈ, Beaulieu-Bonneau S. Learning to Drive With Neurological Conditions: A Mixed-Methods Study On Cognitive Factors and Self-Determination. Arch Phys Med Rehabil 2022. [DOI: 10.1016/j.apmr.2022.08.589] [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: 12/05/2022]
|
3
|
Kauppinen S, Karhula SS, Thevenot J, Ylitalo T, Rieppo L, Kestilä I, Haapea M, Hadjab I, Finnilä MA, Quenneville E, Garon M, Gahunia HK, Pritzker KPH, Buschmann MD, Saarakkala S, Nieminen HJ. 3D morphometric analysis of calcified cartilage properties using micro-computed tomography. Osteoarthritis Cartilage 2019; 27:172-180. [PMID: 30287395 DOI: 10.1016/j.joca.2018.09.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 09/13/2018] [Accepted: 09/18/2018] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Our aim is to establish methods for quantifying morphometric properties of calcified cartilage (CC) from micro-computed tomography (μCT). Furthermore, we evaluated the feasibility of these methods in investigating relationships between osteoarthritis (OA), tidemark surface morphology and open subchondral channels (OSCCs). METHOD Samples (n = 15) used in this study were harvested from human lateral tibial plateau (n = 8). Conventional roughness and parameters assessing local 3-dimensional (3D) surface variations were used to quantify the surface morphology of the CC. Subchondral channel properties (percentage, density, size) were also calculated. As a reference, histological sections were evaluated using Histopathological osteoarthritis grading (OARSI) and thickness of CC and subchondral bone (SCB) was quantified. RESULTS OARSI grade correlated with a decrease in local 3D variations of the tidemark surface (amount of different surface patterns (rs = -0.600, P = 0.018), entropy of patterns (EP) (rs = -0.648, P = 0.018), homogeneity index (HI) (rs = 0.555, P = 0.032)) and tidemark roughness (TMR) (rs = -0.579, P = 0.024). Amount of different patterns (ADP) and EP associated with channel area fraction (CAF) (rp = 0.876, P < 0.0001; rp = 0.665, P = 0.007, respectively) and channel density (CD) (rp = 0.680, P = 0.011; rp = 0.582, P = 0.023, respectively). TMR was associated with CAF (rp = 0.926, P < 0.0001) and average channel size (rp = 0.574, P = 0.025). CC topography differed statistically significantly in early OA vs healthy samples. CONCLUSION We introduced a μ-CT image method to quantify 3D CC topography and perforations through CC. CC topography was associated with OARSI grade and OSCC properties; this suggests that the established methods can detect topographical changes in tidemark and CC perforations associated with OA.
Collapse
Affiliation(s)
- S Kauppinen
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland.
| | - S S Karhula
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland; Infotech, University of Oulu, Finland.
| | - J Thevenot
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland; Infotech, University of Oulu, Finland.
| | - T Ylitalo
- Department of Physics, University of Helsinki, Helsinki, Finland.
| | - L Rieppo
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland.
| | - I Kestilä
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland.
| | - M Haapea
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland; Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland.
| | - I Hadjab
- Polytechnique Montreal, Montreal, Quebec, Canada; Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada.
| | - M A Finnilä
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland; Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.
| | - E Quenneville
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada.
| | - M Garon
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada.
| | - H K Gahunia
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada.
| | - K P H Pritzker
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada; Department of Laboratory Medicine and Pathobiology, Mount Sinai Hospital, Toronto, ON, Canada.
| | | | - S Saarakkala
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland; Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland.
| | - H J Nieminen
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland; Department of Physics, University of Helsinki, Helsinki, Finland; Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada; Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland.
| |
Collapse
|
4
|
Garon M, Forgeot d’Arc B, Lavallée MM, Estay EV, Beauchamp MH. Visual Encoding of Social Cues Contributes to Moral Reasoning in Autism Spectrum Disorder: An Eye-Tracking Study. Front Hum Neurosci 2018; 12:409. [PMID: 30374296 PMCID: PMC6196239 DOI: 10.3389/fnhum.2018.00409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 09/21/2018] [Indexed: 11/16/2022] Open
Abstract
Eye-tracking studies suggest that visual encoding is important for social processes such as socio-moral reasoning. Alterations to the visual encoding of faces, for example, have been linked to the social phenotype of autism spectrum disorders (ASDs) and are associated with social and communication impairments. Yet, people with ASD often perform similarly to neurotypical participants on measures of moral reasoning, supporting the hypothesis of differential mechanisms of moral reasoning in ASD. The objective of this study was to document visual encoding and moral reasoning in ASD and neurotypical individuals using a visual, ecological, sociomoral reasoning paradigm paired with eye-tracking. Two groups (ASD, Control) matched for age and IQ completed the SoMoral task, a set of picture situations describing everyday moral dilemmas, while their eye movements and pupil dilation were recorded. Moral understanding, decision-making, and justification were recorded. Participants with ASD presented a longer time to first fixation on faces. They also understood fewer dilemmas and produced fewer socially adaptive responses. Despite a similar average level of moral maturity, the justifications produced by participants with ASD were not distributed in the same way as the neurotypical participants. Visual encoding was a significant predictor of moral decision-making and moral justification for both groups. The results are discussed in the context of alternative mechanisms of moral reasoning in ASD.
Collapse
Affiliation(s)
- Mathieu Garon
- Department of Psychology, University of Montreal, Montreal, QC, Canada
| | | | - Marie M. Lavallée
- Department of Psychology, University of Montreal, Montreal, QC, Canada
| | - Evelyn V. Estay
- Department of Psychology, University of Montreal, Montreal, QC, Canada
- Centro de Desarrollo de Tecnologías de Inclusión, Escuela de Psicología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Miriam H. Beauchamp
- Department of Psychology, University of Montreal, Montreal, QC, Canada
- Sainte-Justine Hospital Research Center, Montreal, QC, Canada
| |
Collapse
|
5
|
Kestilä I, Thevenot J, Finnilä M, Karhula S, Hadjab I, Kauppinen S, Garon M, Quenneville E, Haapea M, Rieppo L, Pritzker K, Buschmann M, Nieminen H, Saarakkala S. In vitro method for 3D morphometry of human articular cartilage chondrons based on micro-computed tomography. Osteoarthritis Cartilage 2018; 26:1118-1126. [PMID: 29802974 PMCID: PMC6058088 DOI: 10.1016/j.joca.2018.05.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 05/04/2018] [Accepted: 05/16/2018] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The aims of this study were: to 1) develop a novel sample processing protocol to visualize human articular cartilage (AC) chondrons using micro-computed tomography (μCT), 2) develop and validate an algorithm to quantify the chondron morphology in 3D, and 3) compare the differences in chondron morphology between intact and osteoarthritic AC. METHOD The developed protocol is based on the dehydration of samples with hexamethyldisilazane (HMDS), followed by imaging with a desktop μCT. Chondron density and depth, as well as volume and sphericity, were calculated in 3D with a custom-made and validated algorithm employing semi-automatic chondron selection and segmentation. The quantitative parameters were analyzed at three AC depth zones (zone 1: 0-10%; zone 2: 10-40%; zone 3: 40-100%) and grouped by the OARSI histological grades (OARSI grades 0-1.0, n = 6; OARSI grades 3.0-3.5, n = 6). RESULTS After semi-automatic chondron selection and segmentation, 1510 chondrons were approved for 3D morphometric analyses. The chondrons especially in the deeper tissue (zones 2 and 3) were significantly larger (P < 0.001) and less spherical (P < 0.001), respectively, in the OARSI grade 3-3.5 group compared to the OARSI grade 0-1.0 group. No statistically significant difference in chondron density between the OARSI grade groups was observed at different depths. CONCLUSION We have developed a novel sample processing protocol for chondron imaging in 3D, as well as a high-throughput algorithm to semi-automatically quantify chondron/chondrocyte 3D morphology in AC. Our results also suggest that 3D chondron morphology is affected by the progression of osteoarthritis (OA).
Collapse
Affiliation(s)
- I. Kestilä
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Address correspondence and reprint requests to: I. Kestilä, Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, POB 5000, FI-90014 Oulu, Finland.
| | - J. Thevenot
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Infotech Oulu, University of Oulu, Finland
| | - M.A. Finnilä
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Department of Applied Physics, University of Eastern Finland, Kuopio, Finland,Medical Research Center, University of Oulu, Oulu, Finland
| | - S.S. Karhula
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Infotech Oulu, University of Oulu, Finland
| | - I. Hadjab
- Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada,Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada
| | - S. Kauppinen
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland
| | - M. Garon
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada
| | - E. Quenneville
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada
| | - M. Haapea
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Medical Research Center, University of Oulu, Oulu, Finland,Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
| | - L. Rieppo
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - K.P. Pritzker
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada,Mount Sinai Hospital, Toronto, Ontario, Canada
| | - M.D. Buschmann
- Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada,Groupe de Recherche en Sciences et Technologies Biomédicales, Polytechnique Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada
| | - H.J. Nieminen
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Department of Physics, University of Helsinki, Helsinki, Finland,Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
| | - S. Saarakkala
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland,Medical Research Center, University of Oulu, Oulu, Finland,Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland
| |
Collapse
|
6
|
Abstract
As the first step of social information processing, visual encoding underlies the interpretation of social cues. Faces, in particular, convey a large amount of affective information, which can be subsequently used in the planning and production of adaptive social behaviors. Sociomoral reasoning is a specific social skill that is associated with engagement in appropriate social behaviors when faced with dilemmas. Previous studies using eye tracking suggest that visual encoding may play an important role in decision-making when individuals are faced with extreme moral dilemmas, but it is not known if this is generalizable to everyday situations. The main objective of this study was to assess the contribution of visual encoding to everyday sociomoral reasoning using eye tracking and ecological visual dilemmas. Participants completed the SocioMoral Reasoning Aptitude Level (SoMoral) task while their eye movements and pupil dilation were recorded. While visual encoding was not a predictor of sociomoral decision-making, sociomoral maturity was predicted by fixation count. Thus, in an ecological context, visual encoding of social cues appears to be associated with sociomoral maturity: the production of a justification is associated with volitional encoding strategies. Implications with regards to the dual-process theory of sociomoral reasoning and social information processing are discussed.
Collapse
Affiliation(s)
- Mathieu Garon
- Department of Psychology, University of Montreal, Montreal, Qc, Canada
| | | | - Evelyn Vera Estay
- Department of Psychology, University of Montreal, Montreal, Qc, Canada
- Centro de Desarrollo de Tecnologías de Inclusión, Escuela de Psicología, Pontificia Universidad Católica de Chile, Macul, Chile
| | - Miriam H. Beauchamp
- Department of Psychology, University of Montreal, Montreal, Qc, Canada
- Sainte-Justine Hospital Research Center, Montreal, Qc, Canada
- * E-mail:
| |
Collapse
|
7
|
Hadjab I, Sim S, Karhula SS, Kauppinen S, Garon M, Quenneville E, Lavigne P, Lehenkari PP, Saarakkala S, Buschmann MD. Electromechanical properties of human osteoarthritic and asymptomatic articular cartilage are sensitive and early detectors of degeneration. Osteoarthritis Cartilage 2018; 26:405-413. [PMID: 29229562 DOI: 10.1016/j.joca.2017.12.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 11/18/2017] [Accepted: 12/04/2017] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To evaluate cross-correlations of ex vivo electromechanical properties with cartilage and subchondral bone plate thickness, as well as their sensitivity and specificity regarding early cartilage degeneration in human tibial plateau. METHOD Six pairs of tibial plateaus were assessed ex vivo using an electromechanical probe (Arthro-BST) which measures a quantitative parameter (QP) reflecting articular cartilage compression-induced streaming potentials. Cartilage thickness was then measured with an automated thickness mapping technique using Mach-1 multiaxial mechanical tester. Subsequently, a visual assessment was performed by an experienced orthopedic surgeon using the International Cartilage Repair Society (ICRS) grading system. Each tibial plateau was finally evaluated with μCT scanner to determine the subchondral-bone plate thickness over the entire surface. RESULTS Cross-correlations between assessments decreased with increasing degeneration level. Moreover, electromechanical QP and subchondral-bone plate thickness increased strongly with ICRS grade (ρ = 0.86 and ρ = 0.54 respectively), while cartilage thickness slightly increased (ρ = 0.27). Sensitivity and specificity analysis revealed that the electromechanical QP is the most performant to distinguish between different early degeneration stages, followed by subchondral-bone plate thickness and then cartilage thickness. Lastly, effect sizes of cartilage and subchondral-bone properties were established to evaluate whether cartilage or bone showed the most noticeable changes between normal (ICRS 0) and each early degenerative stage. Thus, the effect sizes of cartilage electromechanical QP were almost twice those of the subchondral-bone plate thickness, indicating greater sensitivity of electromechanical measurements to detect early osteoarthritis. CONCLUSION The potential of electromechanical properties for the diagnosis of early human cartilage degeneration was highlighted and supported by cartilage thickness and μCT assessments.
Collapse
Affiliation(s)
- I Hadjab
- Biomedical Engineering Institute, Polytechnique Montreal, Montreal, QC, Canada; Biomomentum Inc., 970 Michelin St., Suite 200, Laval, QC H7L 5C1, Canada.
| | - S Sim
- Biomedical Engineering Institute, Polytechnique Montreal, Montreal, QC, Canada; Biomomentum Inc., 970 Michelin St., Suite 200, Laval, QC H7L 5C1, Canada.
| | - S S Karhula
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Finland; Infotech Oulu, University of Oulu, Finland.
| | - S Kauppinen
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Finland.
| | - M Garon
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, QC H7L 5C1, Canada.
| | - E Quenneville
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, QC H7L 5C1, Canada.
| | - P Lavigne
- Department of Surgery, University of Montreal, Montreal, QC, Canada.
| | - P P Lehenkari
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Finland; Department of Surgery and Intensive Care, University of Oulu and Oulu University Hospital, Finland.
| | - S Saarakkala
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Finland; Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland; Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland.
| | - M D Buschmann
- Biomedical Engineering Institute, Polytechnique Montreal, Montreal, QC, Canada.
| |
Collapse
|
8
|
Abstract
We present a temporal 6-DOF tracking method which leverages deep learning to achieve state-of-the-art performance on challenging datasets of real world capture. Our method is both more accurate and more robust to occlusions than the existing best performing approaches while maintaining real-time performance. To assess its efficacy, we evaluate our approach on several challenging RGBD sequences of real objects in a variety of conditions. Notably, we systematically evaluate robustness to occlusions through a series of sequences where the object to be tracked is increasingly occluded. Finally, our approach is purely data-driven and does not require any hand-designed features: robust tracking is automatically learned from data.
Collapse
|
9
|
Ansado J, Collins L, Fonov V, Garon M, Alexandrov L, Karama S, Evans A, Beauchamp MH. A new template to study callosal growth shows specific growth in anterior and posterior regions of the corpus callosum in early childhood. Eur J Neurosci 2015; 42:1675-84. [PMID: 25864842 DOI: 10.1111/ejn.12869] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Revised: 01/29/2015] [Accepted: 02/06/2015] [Indexed: 11/28/2022]
Abstract
Most of the studies conducted on the development of the corpus callosum (CC) have been limited to a relatively simple assessment of callosal area, providing an estimation of the size of the CC in two dimensions rather than its actual measurement. The goal of this study was to revisit callosal development in childhood and adolescence by using a three-dimensional (3D) magnetic resonance imaging template of the CC that considers the horizontal width of the CC and compares this with the two-dimensional (2D) callosal area. We mapped callosal growth in a large sample of youths followed longitudinally (N = 370 at T1; N = 304 at T2; and N = 246 at T3). Both techniques were based on a five-section subdivision of the CC. The results obtained with the 3D method revealed that the rate of CC growth over a 4-year period in the rostrum, the genu, the anterior body and the splenium was significantly higher in the youngest age group (< 7 years) than in older groups, indicating an intense period of development in early childhood for the anterior and posterior parts of the CC. Similar results were obtained when 2D callosal area was used for the anterior and posterior parts of the CC. However, divergent results were found in the mid-body and the caudal body of the CC. As shown by differences between 2D estimations and actual 3D measurements of callosal growth, our study highlights the importance of considering the horizontal width in measuring developmental changes in the CC.
Collapse
Affiliation(s)
- Jennyfer Ansado
- Ste-Justine Hospital Research Center, Montreal, QC, Canada.,Department of Psychology, University of Montreal, Montreal, QC, H3C 3J7, Canada.,Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | - Louis Collins
- Montreal Neurological Institute, McGill University, Montreal, QC, Canada.,McConnell Brain Imaging Center, McGill University, Montreal, QC, Canada
| | - Vladimir Fonov
- Montreal Neurological Institute, McGill University, Montreal, QC, Canada.,McConnell Brain Imaging Center, McGill University, Montreal, QC, Canada
| | - Mathieu Garon
- Ste-Justine Hospital Research Center, Montreal, QC, Canada.,Department of Psychology, University of Montreal, Montreal, QC, H3C 3J7, Canada
| | | | - Sherif Karama
- Montreal Neurological Institute, McGill University, Montreal, QC, Canada.,McConnell Brain Imaging Center, McGill University, Montreal, QC, Canada
| | - Alan Evans
- Montreal Neurological Institute, McGill University, Montreal, QC, Canada.,McConnell Brain Imaging Center, McGill University, Montreal, QC, Canada
| | - Miriam H Beauchamp
- Ste-Justine Hospital Research Center, Montreal, QC, Canada.,Department of Psychology, University of Montreal, Montreal, QC, H3C 3J7, Canada
| | | |
Collapse
|
10
|
Sim S, Chevrier A, Garon M, Quenneville E, Yaroshinsky A, Hoemann CD, Buschmann MD. Non-destructive electromechanical assessment (Arthro-BST) of human articular cartilage correlates with histological scores and biomechanical properties. Osteoarthritis Cartilage 2014; 22:1926-35. [PMID: 25168362 DOI: 10.1016/j.joca.2014.08.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 08/11/2014] [Accepted: 08/18/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The hand-held Arthro-BST™ device is used to map electromechanical properties of articular cartilage. The purpose of the study was to evaluate correlation of electromechanical properties with histological, biochemical and biomechanical properties of cartilage. METHOD Electromechanical properties (quantitative parameter (QP)) of eight human distal femurs were mapped manually ex vivo using the Arthro-BST (1 measure/site, 5 s/measure, 3209 sites). Osteochondral cores were then harvested from different areas on the femurs and assessed with the Mankin histological score. Prior to histoprocessing, cores were tested in unconfined compression. A subset of the cores was analyzed with polarized light microscopy (PLM) to assess collagen structure. Biochemical assays were done on additional cores to obtain water content and glycosaminoglycan (GAG) content. The QP corresponding to each core was calculated by averaging all QPs collected within 6 mm of the core center. RESULTS The electromechanical QP correlated strongly with both the Mankin score and the PLM score (r = 0.73, P < 0.0001 and r = -0.70, P < 0.0001 respectively) thus accurately reflecting tissue quality and collagen architecture. Electromechanical QP also correlated strongly with biomechanical properties including fibril modulus (r = -0.76, P < 0.0001), matrix modulus (r = -0.69, P < 0.0001), and log of permeability (r = 0.72, P < 0.0001). The QP correlated weakly with GAG per wet weight and with water content (r = -0.50, P < 0.0003 and r = 0.39, P < 0.006 respectively). CONCLUSION Non-destructive electromechanical QP measurements correlate strongly with histological scores and biomechanical parameters providing a rapid and reliable assessment of articular cartilage quality.
Collapse
Affiliation(s)
- S Sim
- Department of Chemical Engineering and Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada; Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada.
| | - A Chevrier
- Department of Chemical Engineering and Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada.
| | - M Garon
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada.
| | - E Quenneville
- Biomomentum Inc., 970 Michelin St., Suite 200, Laval, Quebec H7L 5C1, Canada.
| | - A Yaroshinsky
- Vital Systems, Inc., 3701 Algonquin Rd, Suite 310 Rolling Meadows, IL 60008, USA.
| | - C D Hoemann
- Department of Chemical Engineering and Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada; Groupe de Recherche en Sciences et Technologies Biomédicales, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada.
| | - M D Buschmann
- Department of Chemical Engineering and Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada; Groupe de Recherche en Sciences et Technologies Biomédicales, Ecole Polytechnique de Montreal, P.O. Box 6079, Station Centre-Ville, Montreal, Quebec H3C 3A7, Canada.
| |
Collapse
|
11
|
Changoor A, Coutu JP, Garon M, Quenneville E, Hurtig MB, Buschmann MD. Streaming potential-based arthroscopic device is sensitive to cartilage changes immediately post-impact in an equine cartilage injury model. J Biomech Eng 2011; 133:061005. [PMID: 21744925 DOI: 10.1115/1.4004230] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Models of post-traumatic osteoarthritis where early degenerative changes can be monitored are valuable for assessing potential therapeutic strategies. Current methods for evaluating cartilage mechanical properties may not capture the low-grade cartilage changes expected at these earlier time points following injury. In this study, an explant model of cartilage injury was used to determine whether streaming potential measurements by manual indentation could detect cartilage changes immediately following mechanical impact and to compare their sensitivity to biomechanical tests. Impacts were delivered ex vivo, at one of three stress levels, to specific positions on isolated adult equine trochlea. Cartilage properties were assessed by streaming potential measurements, made pre- and post-impact using a commercially available arthroscopic device, and by stress relaxation tests in unconfined compression geometry of isolated cartilage disks, providing the streaming potential integral (SPI), fibril modulus (Ef), matrix modulus (Em), and permeability (k). Histological sections were stained with Safranin-O and adjacent unstained sections examined in polarized light microscopy. Impacts were low, 17.3 ± 2.7 MPa (n = 15), medium, 27.8 ± 8.5 MPa (n = 13), or high, 48.7 ± 12.1 MPa (n = 16), and delivered using a custom-built spring-loaded device with a rise time of approximately 1 ms. SPI was significantly reduced after medium (p = 0.006) and high (p<0.001) impacts. Ef, representing collagen network stiffness, was significantly reduced in high impact samples only (p < 0.001 lateral trochlea, p = 0.042 medial trochlea), where permeability also increased (p = 0.003 lateral trochlea, p = 0.007 medial trochlea). Significant (p < 0.05, n = 68) moderate to strong correlations between SPI and Ef (r = 0.857), Em (r = 0.493), log(k) (r = -0.484), and cartilage thickness (r = -0.804) were detected. Effect sizes were higher for SPI than Ef, Em, and k, indicating greater sensitivity of electromechanical measurements to impact injury compared to purely biomechanical parameters. Histological changes due to impact were limited to the presence of superficial zone damage which increased with impact stress. Non-destructive streaming potential measurements were more sensitive to impact-related articular cartilage changes than biomechanical assessment of isolated samples using stress relaxation tests in unconfined compression geometry. Correlations between electromechanical and biomechanical methods further support the relationship between non-destructive electromechanical measurements and intrinsic cartilage properties.
Collapse
Affiliation(s)
- A Changoor
- Department of Chemical Engineering, Institute of Biomedical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-Ville Montreal, QC H3C3A7, Canada
| | | | | | | | | | | |
Collapse
|
12
|
Changoor A, Tran-Khanh N, Méthot S, Garon M, Hurtig MB, Shive MS, Buschmann MD. A polarized light microscopy method for accurate and reliable grading of collagen organization in cartilage repair. Osteoarthritis Cartilage 2011; 19:126-35. [PMID: 20955805 DOI: 10.1016/j.joca.2010.10.010] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2010] [Revised: 08/11/2010] [Accepted: 10/02/2010] [Indexed: 02/02/2023]
Abstract
OBJECTIVES Collagen organization, a feature that is critical for cartilage load bearing and durability, is not adequately assessed in cartilage repair tissue by present histological scoring systems. Our objectives were to develop a new polarized light microscopy (PLM) score for collagen organization and to test its reliability. DESIGN This PLM score uses an ordinal scale of 0-5 to rate the extent that collagen network organization resembles that of young adult hyaline articular cartilage (score of 5) vs a totally disorganized tissue (score of 0). Inter-reader reliability was assessed using Intraclass Correlation Coefficients (ICC) for Agreement, calculated from scores of three trained readers who independently evaluated blinded sections obtained from normal (n=4), degraded (n=2) and repair (n=22) human cartilage biopsies. RESULTS The PLM score succeeded in distinguishing normal, degraded and repair cartilages, where the latter displayed greater complexity in collagen structure. Excellent inter-reader reproducibility was found with ICCs for Agreement of 0.90 [ICC(2,1)] (lower boundary of the 95% confidence interval is 0.83) and 0.96 [ICC(2,3)] (lower boundary of the 95% confidence interval is 0.94), indicating the reliability of a single reader's scores and the mean of all three readers' scores, respectively. CONCLUSION This PLM method offers a novel means for systematically evaluating collagen organization in repair cartilage. We propose that it be used to supplement current gold standard histological scoring systems for a more complete assessment of repair tissue quality.
Collapse
Affiliation(s)
- A Changoor
- Department of Chemical Engineering and Institute of Biomedical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-Ville, Montreal, Québec H3C 3A7, Canada
| | | | | | | | | | | | | |
Collapse
|
13
|
Charpin-Kadouch C, Mouche JM, Quéralt J, Ercoli J, Hugues B, Garon M, Dumon H, Charpin DA. [Housing and health counselling services in the management of allergic respiratory disease]. Rev Mal Respir 2008; 25:821-7. [PMID: 18946407 DOI: 10.1016/s0761-8425(08)74347-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION Input from Housing and health counselling services is advisable when a patient's health seems to be impaired by their housing conditions. METHODS 650 home visits have been performed by our organisation since 2002. Each visit includes a questionnaire to assess respiratory as well as non-respiratory indoor risk factors, Acarex test to assess mite-allergen content in mattress dust, mould sampling and, when appropriate, air sampling for measurement of volatile organic compounds and aldehydes. RESULTS The dwellings studied were mostly flats located in the downtown and occupied by a tenant. In most instances, several health hazards were identified. These hazards, in decreasing occurrence included: mold (74.4%), mite infestation in mattress dust (56.3%), cleaning products accessible to children's'hands (47.8%), dangerous electrical circuits (21.1%), exposure to chemical air pollutants (9.0%), exposure to an electromagnetic field (2.8%). Numerous fungal species were identified often occurring in association. CONCLUSION This service allowed the identification of numerous and various health hazards. Its efficacy and effectiveness remains to be evaluated.
Collapse
|
14
|
Gauthier M, Luo J, Calvet D, Ni C, Zhu X, Garon M, Buschmann M. Degree of crosslinking and mechanical properties of crosslinked poly(vinyl alcohol) beads for use in solid-phase organic synthesis. POLYMER 2004. [DOI: 10.1016/j.polymer.2004.09.055] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
15
|
Binette JS, Garon M, Savard P, McKee MD, Buschmann MD. Tetrapolar Measurement of Electrical Conductivity and Thickness of Articular Cartilage. J Biomech Eng 2004; 126:475-84. [PMID: 15543865 DOI: 10.1115/1.1785805] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A tetrapolar method to measure electrical conductivity of cartilage and bone, and to estimate the thickness of articular cartilage attached to bone, was developed. We determined the electrical conductivity of humeral head bovine articular cartilage and subchondral bone from a 1- to 2-year-old steer to be 1.14±0.11S/m(mean±sd,n=11) and 0.306±0.034S/m,(mean±sd,n=3), respectively. For a 4-year-old cow, articular cartilage and subchondral bone electrical conductivity were 0.88±0.08S/m(mean±sd,n=9) and 0.179±0.046S/m(mean±sd,n=3), respectively. Measurements on slices of cartilage taken from different distances from the articular surface of the steer did not reveal significant depth-dependence of electrical conductivity. We were able to estimate the thickness of articular cartilage with reasonable precision (<20% error) by injecting current from multiple electrode pairs with different inter-electrode distances. Requirements for the precision of this method to measure cartilage thickness include the presence of a distinct layer of calcified cartilage or bone with a much lower electrical conductivity than that of uncalcified articular cartilage, and the use of inter-electrode distances of the current injecting electrodes that are on the order of the cartilage thickness. These or similar methods present an attractive approach to the non-destructive determination of cartilage thickness, a parameter that is required in order to estimate functional properties of cartilage attached to bone, and evaluate the need for therapeutic interventions in arthritis.
Collapse
Affiliation(s)
- J S Binette
- Institute of Biomedical Engineering Faculty of Dentistry, and Department of Anatomy and Cell Biology, McGill University, Montréal, Québec, Canada
| | | | | | | | | |
Collapse
|
16
|
Abstract
Cartilage molecular changes in osteoarthritis are most commonly related to the degradation and loss of proteoglycan and collagen fibrils of the extracellular matrix, which directly influence tissue stiffness and compression-generated streaming potentials. In this study, we evaluated the potential of a new technique, spatially resolved mapping of streaming potentials, to non-destructively indicate cartilage health or degeneration. Matched pairs of bovine cartilage/bone explant disks were cultured for 11 days in a serum free medium with and without interleukin-lalpha (IL-1alpha). The electromechanical properties (static stiffness, dynamic stiffness and streaming potentials) of cartilage disks were measured during unconfined compression using a mechanical tester coupled with a linear array of eight 50 microm diameter platinum-iridium microelectrodes. After 11 days of culture, the proteoglycan content of IL-1alpha treated disks was significantly reduced and the denatured and cleaved collagen content was increased compared to control disks. These biochemical alterations were concomitant with the reductions in the amplitudes of the static stiffness, the dynamic stiffness and the streaming potential profile as well as changes in the shape of the streaming potential profile. We found that spatial mapping of streaming potentials presents several advantages for the development of a clinical instrument to evaluate the degeneration of articular cartilage.
Collapse
Affiliation(s)
- A Légaré
- Institute of Biomedical Engineering, Ecole Polytechnique de Montreal, Que, Canada
| | | | | | | | | | | |
Collapse
|
17
|
Garon M, Légaré A, Guardo R, Savard P, Buschmann MD. Streaming potentials maps are spatially resolved indicators of amplitude, frequency and ionic strength dependant responses of articular cartilage to load. J Biomech 2002; 35:207-16. [PMID: 11784539 DOI: 10.1016/s0021-9290(01)00197-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Streaming potential distributions were measured on the surface of articular cartilage in uniaxial unconfined compression using a linear array of microelectrodes. Potential profiles were obtained for sinusoidal and ramp/stress-relaxation displacements and exhibited dependencies on radial position, sinusoidal amplitude and frequency, time during stress relaxation, and on ionic strength. The measurements agreed with trends predicted by biphasic and related models. In particular, the absolute potential amplitude was maximal at the disk center, as was the predicted fluid pressure and the potential gradient (the electric field) was seen to be maximal at the disk periphery, as was the predicted fluid velocity. We also observed a similarity between non-linear behavior of streaming potential amplitude and load amplitude with respect to sinusoidal displacement amplitude. Taken together, these results support many of the phenomena concerning relative fluid-solid movement and fluid pressurization predicted by biphasic and related models, and they indicate the general utility of spatially resolved measurements of streaming potentials for the investigation of electromechanical phenomena in tissues. For example, these streaming potential maps could be used to non-destructively diagnose cartilage extracellular matrix composition and function, as well as to quantify spatially and temporally varying physical signals in cartilage that can induce cellular and extracellular biological responses to load.
Collapse
Affiliation(s)
- M Garon
- Institute of Biomedical Engineering, Ecole Polytechnique of Montreal, P.O. Box 6079 Station Centre-ville, Montreal, Quebec, Canada H3C 3A7.
| | | | | | | | | |
Collapse
|
18
|
Valois D, Fayad K, Barasubiye T, Garon M, Dery C, Brzezinski R, Beaulieu C. Glucanolytic Actinomycetes Antagonistic to Phytophthora fragariae var. rubi, the Causal Agent of Raspberry Root Rot. Appl Environ Microbiol 1996; 62:1630-5. [PMID: 16535313 PMCID: PMC1388851 DOI: 10.1128/aem.62.5.1630-1635.1996] [Citation(s) in RCA: 103] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A collection of about 200 actinomycete strains was screened for the ability to grow on fragmented Phytophthora mycelium and to produce metabolites that inhibit Phytophthora growth. Thirteen strains were selected, and all produced (beta)-1,3-, (beta)-1,4-, and (beta)-1,6-glucanases. These enzymes could hydrolyze glucans from Phytophthora cell walls and cause lysis of Phytophthora cells. These enzymes also degraded other glucan substrates, such as cellulose, laminarin, pustulan, and yeast cell walls. Eleven strains significantly reduced the root rot index when inoculated on raspberry plantlets.
Collapse
|
19
|
Heggie J, Garon M, Kodiath M, Kelly A. Implementing the science of unitary human beings at the San Diego Veterans Affairs Medical Center. NLN Publ 1994:285-303. [PMID: 8028978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
|
20
|
Garon M. Contributions of Martha Rogers to the development of nursing knowledge. Nurs Outlook 1992; 40:67-72. [PMID: 1589323] [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: 12/27/2022]
Abstract
Martha Rogers' greatest contribution may be her introduction into nursing of a questioning stance about the prevailing models of science, leading to increased acceptance of alternative paradigms, a variety of research methods, and explorations of topics such as existentialism and Eastern philosophy. Nursing is a richer, more diverse profession because of Martha Rogers.
Collapse
Affiliation(s)
- M Garon
- Outpatient Department, Veterans Affairs Medical Center, San Diego, CA
| |
Collapse
|
21
|
|
22
|
Barden N, Mérand Y, Rouleau D, Garon M, Dupont A. Changes in the beta-endorphin content of discrete hypothalamic nuclei during the estrous cycle of the rat. Brain Res 1981; 204:441-5. [PMID: 7193067 DOI: 10.1016/0006-8993(81)90605-3] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Concentrations of beta-endorphin were measured in discrete brain nuclei of 4-day cycling rats on each day of the estrous cycle. On the afternoon of proestrus beta-endorphin levels were significantly higher in median eminence and suprachiasmatic nucleus, and lower in arcuate nucleus, when compared to levels found on other days of the cycle. These changes coincided with the peak of plasma prolactin, which was blocked by prior administration of naloxone.
Collapse
|
23
|
Dupont A, Cusan L, Garon M, Alvarado-Urbina G, Labrie F. Extremely rapid degradation of [3H] methionine-enkephalin by various rat tissues in vivo and in vitro. Life Sci 1977; 21:907-14. [PMID: 927020 DOI: 10.1016/0024-3205(77)90254-5] [Citation(s) in RCA: 104] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
24
|
Léan AD, Garon M, Kelly PA, Labrie F. Changes of pituitary thyrotropin releasing hormone (TRH) receptor level and prolactin response to TRH during the rat estrous cycle. Endocrinology 1977; 100:1505-10. [PMID: 192538 DOI: 10.1210/endo-100-6-1505] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The plasma PRL and TSH responses to TRH injected iv at different stages of the estrous cycle in normal rats under Surital anesthesia were maximal during the afternoon of proestrus and morning of estrus and lowest on diestrus I. As calculated from the areas under the plasma response curves, a 10-fold difference was found between the maximal and minimal PRL responses while a 2-fold difference was measured for TSH. The plasma PRL and TSH responses to TRH showed a correlation with the binding of [3H]TRH to anterior pituitary gland, a 3-fold difference being observed between the minimal binding measured on the morning of diestrus II and the maximal value found on the evening of proestrus. Contrary to findings with LHRH and LH, repeated injections of a small dose (10 ng) of TRH in the afternoon of proestrus abolished PRL and TSH responses to subsequent injection of the neurohormone.
Collapse
|
25
|
Abstract
Two micrograms of beta-endorphin (beta-lipotropin61-91) injected intraventricularly in rats that had been treated with antiserum against somatostatin led to a 6- and 10-fold stimulation of the concentration of plasma growth hormone (somatotropin) measured 10 and 20 min after injection of the peptide, whereas 400 mug of methionine-enkephalin led to a 4- to 6-fold increase of levels of plasma growth hormone at 10 min with a rapid return to basal levels at later time intervals. At doses of 5 and 25 mug, beta-endorphin led to a 20- to 30-fold stimulation of levels of plasma growth hormone, the maximal effect being measured between 20 and 30 min after injection. These data suggest the possible role of the endogenous opiate-like peptides in the control of growth hormone secretion.
Collapse
|