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2. Association of Hospital Volume with Perioperative Mortality of Endovascular Repair of Complex Aortic Aneurysms: A Nationwide Cohort Study

Author

Alberga, Anna J., von Meijenfeldt, Gerdine C. I., Rastogi, Vinamr, de Bruin, Jorg L., Wever, Jan J., van Herwaarden, Joost A., Hamming, Jaap F., Hazenberg, Constantijn E. V. B., van Schaik, Jan, Mees, Barend M. E., van der Laan, Maarten J., Zeebregts, Clark J., Schurink, Geert W. H., Verhagen, Hence J. M., van den Akker, P. J., Akkersdijk, G. P., Akkersdijk, W. L., van Andringa de Kempenaer, M. G., Arts, C. H. P., Avontuur, A. M., Bakker, O. J., Balm, R., Barendregt, W. B., Bekken, J. A., Bender, M. H. M., Bendermacher, B. L. W., van den Berg, M., Beuk, R. J., Blankensteijn, J. D., Bode, A. S., Bodegom, M. E., van der Bogt, K. E. A., Boll, A. P. M., Booster, M. H., Borger van der Burg, B. L. S., de Borst, G. J., Bos-van Rossum, W. T. G. J., Bosma, J., Botman, J. M. J., Bouwman, L. H., Brehm, V., de Bruijn, M. T., de Bruin, J. L., Brummel, P., van Brussel, J. P., Buijk, S. E., Buimer, M. G., Buscher, H. C. J. L., Cancrinus, E., Castenmiller, P. H., Cazander, G., Cuypers, P. W. M., Daemen, J. H. C., Dawson, I., Dierikx, J. E., Dijkstra, M. L., Diks, J., Dinkelman, M. K., Dirven, M., Dolmans, D. E. J. G. J., van Dortmont, L. M. C., Drouven, J. W., van der Eb, M. M., Eefting, D., van Eijck, G. J. W. M., Elshof, J. W. M., Elsman, A. H. P., van der Elst, A., van Engeland, M. I. A., van Eps, G. S., Faber, M. J., de Fijter, W. M., Fioole, B., Fritschy, W. M., Fung Kon Jin, P. H. P., Geelkerken, R. H., van Gent, W. B., Glade, G. J., Govaert, B., Groenendijk, R. P. R., de Groot, H. G. W., van den Haak, R. F. F., de Haan, E. F. A., Hajer, G. F., Hamming, J. F., van Hattum, E. S., Hazenberg, C. E. V. B., Hedeman Joosten, P. P. A., Helleman, J. N., van der Hem, L. G., Hendriks, J. M., van Herwaarden, J. A., Heyligers, J. M. M., Hinnen, J. W., Hissink, R. J., Ho, G. H., den Hoed, P. T., Hoedt, M. T. C., van Hoek, F., Hoencamp, R., Hoffmann, W. H., Hoksbergen, A. W. J., Hollander, E. J. F., Huisman, L. C., Hulsebos, R. G., Huntjens, K. M. B., Idu, M. M., Jacobs, M. J. H. M., van der Jagt, M. F. P., Jansbeken, J. R. H., Janssen, R. J. L., Jiang, H. H. L., de Jong, S. C., Jongbloed-Winkel, T. A., Jongkind, V., Kapma, M. R., Keller, B. P. J. A., Jahrome, A. Khodadade, Kievit, J. K., Klemm, P. L., Klinkert, P., Koedam, N. A., Koelemaij, M. J. W., Kolkert, J. L. P., Koning, G. G., Koning, O. H. J., Konings, R., Krasznai, A. G., Kropman, R. H. J., Kruse, R. R., van der Laan, L., van der Laan, M. J., van Laanen, J. H. H., van Lammeren, G. W., Lamprou, D. A. A., Lardenoije, J. H. P., Lauret, G. J., Leenders, B. J. M., Legemate, D. A., Leij-Dekkers, V. J., Lemson, M. S., Lensvelt, M. M. A., Lijkwan, M. A., van der Linden, F. T. P. M., Lung, P. F. L., Loos, M. J. A., Loubert, M. C., van de Luijtgaarden, K. M., Mahmoud, D. E. A. K., Manshanden, C. G., Mat-Tens, E. C. J. L., Meerwaldt, R., Mees, B. M. E., Menting, T. P., Metz, R., de Mol van Otterloo, J. C. A., Molegraaf, M. J., Montauban van Swijn-Dregt, Y. C. A., Morak, M. J. M., van de Mortel, R. H. W., Mulder, W., Nagesser, S. K., Naves, C. C. L. M., Nederhoed, J. H., Nevenzel, A. M., de Nie, A. J., Nieuwenhuis, D. H., van Nieuwenhuizen, R. C., Nieuwenhui-Zen, J., Nio, D., Oomen, A. P. A., Oranen, B. I., Oskam, J., Palamba, H. W., Peppelenbosch, A. G., van Petersen, A. S., Petri, B. J., Pierie, M. E. N., Ploeg, A. J., Pol, R. A., Ponfoort, E. D., Poyck, P. P. C., Prent, A., ten Raa, S., Raymakers, J. T. F. J., Reichmann, B. L., Reijnen, M. M. P. J., de Ridder, J. A. M., Rijbroek, A., van Rijn, M. J. E., de Roo, R. A., Rouwet, E. V., Saleem, B. R., van Sambeek, M. R. H. M., Samyn, M. G., van't Sant, H. P., van Schaik, J., van Schaik, P. M., Scharn, D. M., Scheltinga, M. R. M., Schepers, A., Schlejen, P. M., Schlösser, F. J. V., Schol, F. P. G., Scholtes, V. P. W., Schouten, O., Schreve, M. A., Schurink, G. W. H., Sikkink, C. J. J. M., te Slaa, A., Smeets, H. J., Smeets, L., Smeets, R. R., de Smet, A. A. E. A., Smit, P. C., Smits, T. M., Snoeijs, M. G. J., Sondakh, A. O., Speijers, M. J., van der Steenhoven, T. J., van Sterkenburg, S. M. M., Stigter, D. A. A., Stokmans, R. A., Strating, R. P., Stultiëns, G. N. M., Sybrandy, J. E. M., Teijink, J. A. W., Telgenkamp, B. J., Testroote, M. J. G., Tha-in, T., The, R. M., Thijsse, W. J., Thomassen, I., Tielliu, I. F. J., van Tongeren, R. B. M., Toorop, R. J., Tournoij, E., Truijers, M., Türkcan, K., Nolthenius, R. P. Tutein, Ünlü, C., Vaes, R. H. D., Vahl, A. C., Veen, E. J., Veger, H. T. C., Veldman, M. G., Verhagen, H. J. M., Verhoeven, B. A. N., Vermeulen, C. F. W., Vermeulen, E. G. J., Vierhout, B. P., van der Vijver-Coppen, R. J., Visser, M. J. T., van der Vliet, J. A., van Vlijmen-van Keulen, C. J., van der Vorst, J. R., Vos, A. W. F., Vos, C. G., Vos, G. A., de Vos, B., Voûte, M. T., Vriens, B. H. R., Vriens, P. W. H. E., de Vries, D. K., de Vries, J. P. P. M., de Vries, M., de Vries, A. C., van der Waal, C., Waasdorp, E. J., de Vries, B. M. Wallis, van Walraven, L. A., van Wanroi, J. L., Warlé, M. C., van Weel, V., van Well, A. M. E., Welten, G. M. J. M., Wever, J. J., Wiersema, A. M., Wikkeling, O. R. M., Willaert, W. I. M., Wille, J., Willems, M. C. M., Willigendael, E. M., Wilschut, E. D., Wisselink, W., Witte, M. E., Wittens, C. H. A., Wong, C. Y., Yazar, O., Yeung, K. K., Zeebregts, C. J. A. M., van Zeeland, M. L. P., Physiology, ACS - Pulmonary hypertension & thrombosis, Surgery, ACS - Atherosclerosis & ischemic syndromes, ACS - Microcirculation, VU University medical center, AII - Inflammatory diseases, APH - Digital Health, Medical Biochemistry, ACS - Diabetes & metabolism, AII - Infectious diseases, and AGEM - Amsterdam Gastroenterology Endocrinology Metabolism

Subjects
volume-outcome, complex AAA, endovascular, mortality
Abstract

Objective: We evaluate nationwide perioperative outcomes of complex EVAR and assess the volume-outcome association of complex EVAR. Summary of Background Data: Endovascular treatment with fenestrated (FEVAR) or branched (BEVAR) endografts is progressively used for excluding complex aortic aneurysms (complex AAs). It is unclear if a volumeoutcome association exists in endovascular treatment of complex AAs (complex EVAR). Methods: All patients prospectively registered in the Dutch Surgical Aneurysm Audit who underwent complex EVAR (FEVAR or BEVAR) between January 2016 and January 2020 were included. The effect of annual hospital volume on perioperative mortality was examined using multivariable logistic regression analyses. Patients were stratified into quartiles based on annual hospital volume to determine hospital volume categories. Results: We included 694 patients (539 FEVAR patients, 155 BEVAR patients). Perioperative mortality following FEVAR was 4.5% and 5.2% following BEVAR. Postoperative complication rates were 30.1% and 48.7%, respectively. The first quartile hospitals performed

Published
2023

4. Treatment Outcome Trends for Non-Ruptured Abdominal Aortic Aneurysms: A Nationwide Prospective Cohort Study

Author

Alberga, Anna J., Karthaus, Eleonora G., Wilschut, Janneke A., de Bruin, Jorg L., Akkersdijk, George P., Geelkerken, Robert H., Hamming, Jaap F., Wever, Jan J., Verhagen, Hence J. M., van den Akker, P. J., Akkersdijk, G. P., Akkersdijk, W. L., van Andringa de Kempenaer, M. G., Arts, C. H. P., Avontuur, A. M., Bakker, O. J., Balm, R., Barendregt, W. B., Bekken, J. A., Bender, M. H. M., Bendermacher, B. L. W., van den Berg, M., Beuk, R. J., Blankensteijn, J. D., Bode, A. S., Bodegom, M. E., van der Bogt, K. E. A., Boll, A. P. M., Booster, M. H., Borger van der Burg, B. L. S., de Borst, G. J., Bos-van Rossum, W. T. G. J., Bosma, J., Botman, J. M. J., Bouwman, L. H., Brehm, V., de Bruijn, M. T., de Bruin, J. L., Brummel, P., van Brussel, J. P., Buijk, S. E., Buimer, M. G., Buscher, H. C. J. L., Cancrinus, E., Castenmiller, P. H., Cazander, G., Cuypers, P. H. W. M., Daemen, J. H. C., Dawson, I., Dierikx, J. E., Dijkstra, M. L., Diks, J., Dinkelman, M. K., Dirven, M., Dolmans, D. E. J. G. J., van Dortmont, L. M. C., Drouven, J. W., van der Eb, M. M., Eefting, D., van Eijck, G. J. W. M., Elshof, J. W. M., Elsman, B. H. P., van der Elst, A., van Engeland, M. I. A., van Eps, G. S., Faber, M. J., de Fijter, W. M., Fioole, B., Fritschy, W. M., Jin, P. H. P. F. K., Geelkerken, R. H., van Gent, W. B., Glade, G. J., Govaert, B., Groenendijk, R. P. R., de Groot, H. G. W., van den Haak, R. F. F., de Haan, E. F. A., Hajer, G. F., Hamming, J. F., van Hattum, E. S., Hazenberg, C. E. V. B., Hedeman Joosten, P. P. H. A., Helleman, J. N., van der Hem, L. G., Hendriks, J. M., van Herwaarden, J. A., Heyligers, J. M. M., Hinnen, J. W., Hissink, R. J., Ho, G. H., den Hoed, P. T., Hoedt, M. T. C., van Hoek, F., Hoencamp, R., Hoffmann, W. H., Hoksbergen, A. W. J., Hollander, E. J. F., Huisman, L. C., Hulsebos, R. G., Huntjens, K. M. B., Idu, M. M., Jacobs, M. J. H. M., van der Jagt, M. F. P., Jansbeken, J. R. H., Janssen, R. J. L., Jiang, H. H. L., de Jong, S. C., Jongbloed-Winkel, T. A., Jongkind, V., Kapma, M. R., Keller, B. P. J. A., Jahrome, A. K., Kievit, J. K., Klemm, P. L., Klinkert, P., Koedam, N. A., Koelemaij, M. J. W., Kolkert, J. L. P., Koning, G. G., Koning, O. H. J., Konings, R., Krasznai, A. G., Kropman, R. H. J., Kruse, R. R., van der Laan, L., van der Laan, M. J., van Laanen, J. H. H., van Lammeren, G. W., Lamprou, D. A. A., Lardenoije, J. H. P., Lauret, G. J., Leenders, B. J. M., Legemate, D. A., Leijdekkers, V. J., Lemson, M. S., Lensvelt, M. M. A., Lijkwan, M. A., van der Linden, F. T. H. P. M., Lung, P. F. Liqui, Loos, M. J. A., Loubert, M. C., van de Luijtgaarden, K. M., Mahmoud, D. E. A. K., Manshanden, C. G., Mattens, E. C. J. L., Meerwaldt, R., Mees, B. M. E., Menting, T. P., Metz, R., de Mol van Otterloo, J. C. A., Molegraaf, M. J., Montauban van Swijndregt, Y. C. A., Morak, M. J. M., van de Mortel, R. H. W., Mulder, W., Nagesser, S. K., Naves, C. C. L. M., Nederhoed, J. H., Nevenzel, A. M., de Nie, A. J., Nieuwenhuis, D. H., van Nieuwenhuizen, R. C., Nieuwenhuizen, J., Nio, D., Oomen, A. P. A., Oranen, B. I., Oskam, J., Palamba, H. W., Peppelenbosch, A. G., van Petersen, A. S., Petri, B. J., Pierie, M. E. N., Ploeg, A. J., Pol, R. A., Ponfoort, E. D., Poyck, P. P. C., Prent, A., Raa, S. ten, Raymakers, J. T. F. J., Reichmann, B. L., Reijnen, M. M. P. J., de Ridder, J. A. M., Rijbroek, A., van Rijn, M. J. E., de Roo, R. A., Rouwet, E. V., Saleem, B. R., van Sambeek, M. R. H. M., Samyn, M. G., van ’t Sant, H. P., van Schaik, J., van Schaik, P. M., Scharn, D. M., Scheltinga, M. R. M., Schepers, A., Schlejen, P. M., Schlösser, F. J. V., Schol, F. P. G., Scholtes, V. P. W., Schouten, O., Schreve, M. A., Schurink, G. W. H., Sikkink, C. J. J. M., Slaa, A. te, Smeets, H. J., Smeets, L., Smeets, R. R., de Smet, A. A. E. A., Smit, P. C., Smits, T. M., Snoeijs, M. G. J., Sondakh, A. O., Speijers, M. J., van der Steenhoven, T. J., van Sterkenburg, S. M. M., Stigter, D. A. A., Stokmans, R. A., Strating, R. P., Stultiëns, G. N. M., Sybrandy, J. E. M., Teijink, J. A. W., Telgenkamp, B. J., Testroote, M. J. G., Tha-in, T., The, R. M., Thijsse, W. J., Thomassen, I., Tielliu, I. F. J., van Tongeren, R. B. M., Toorop, R. J., Tournoij, E., Truijers, M., Türkcan, K., Tutein Nolthenius, R. P., Ünlü, C., Vaes, R. H. D., Vahl, A. C., Veen, E. J., Veger, H. T. C., Veldman, M. G., Verhagen, H. J. M., Verhoeven, B. A. N., Vermeulen, C. F. W., Vermeulen, E. G. J., Vierhout, B. P., van der Vijver-Coppen, R. J., Visser, M. J. T., van der Vliet, J. A., van Vlijmen - van Keulen, C. J., van der Vorst, J. R., Vos, A. W. F., Vos, C. G., Vos, G. A., de Vos, B., Voûte, M. T., Vriens, B. H. R., Vriens, P. W. H. E., de Vries, D. K., de Vries, J. P. P. M., de Vries, M., de Vries, A. C., van der Waal, C., Waasdorp, E. J., Wallis de Vries, B. M., van Walraven, L. A., van Wanroi, J. L., Warlé, M. C., van Weel, V., van Well, A. M. E., Welten, G. M. J. M., Wever, J. J., Wiersema, A. M., Wikkeling, O. R. M., Willaert, W. I. M., Wille, J., Willems, M. C. M., Willigendael, E. M., Wilschut, E. D., Wisselink, W., Witte, M. E., Wittens, C. H. A., Wong, C. Y., Yazar, O., Yeung, K. K., Zeebregts, C. J. A. M., van Zeeland, M. L. P., ACS - Microcirculation, Anesthesiology, Physiology, ACS - Pulmonary hypertension & thrombosis, Surgery, ACS - Atherosclerosis & ischemic syndromes, VU University medical center, ACS - Diabetes & metabolism, TechMed Centre, Multi-Modality Medical Imaging, Medical Biochemistry, and AGEM - Amsterdam Gastroenterology Endocrinology Metabolism

Subjects
Male, Time Factors, Operative procedure, Vascular damage Radboud Institute for Health Sciences [Radboudumc 16], Risk Assessment, Blood Vessel Prosthesis Implantation, Postoperative Complications, Risk Factors, Humans, Hospital Mortality, Prospective Studies, Registries, Treatment outcome, Aged, Netherlands, Retrospective Studies, Aged, 80 and over, Endovascular Procedures, Quality of care, Middle Aged, Endovascular procedure, Abdominal aortic aneurysm, Surgery, Female, Trends, Cardiology and Cardiovascular Medicine, Aortic Aneurysm, Abdominal
Abstract

Contains fulltext : 251573.pdf (Publisher’s version ) (Open Access) OBJECTIVE: The Dutch Surgical Aneurysm Audit (DSAA) initiative was established in 2013 to monitor and improve nationwide outcomes of aortic aneurysm surgery. The objective of this study was to examine whether outcomes of surgery for intact abdominal aortic aneurysms (iAAA) have improved over time. METHODS: Patients who underwent primary repair of an iAAA by standard endovascular (EVAR) or open surgical repair (OSR) between 2014 and 2019 were selected from the DSAA for inclusion. The primary outcome was peri-operative mortality trend per year, stratified by OSR and EVAR. Secondary outcomes were trends per year in major complications, textbook outcome (TbO), and characteristics of treated patients. The trends per year were evaluated and reported in odds ratios per year. RESULTS: In this study, 11 624 patients (74.8%) underwent EVAR and 3 908 patients (25.2%) underwent OSR. For EVAR, after adjustment for confounding factors, there was no improvement in peri-operative mortality (aOR [adjusted odds ratio] 1.06, 95% CI 0.94 - 1.20), while major complications decreased (2014: 10.1%, 2019: 7.0%; aOR 0.91, 95% CI 0.88 - 0.95) and the TbO rate increased (2014: 68.1%, 2019: 80.9%; aOR 1.13, 95% CI 1.10 - 1.16). For OSR, the peri-operative mortality decreased (2014: 6.1%, 2019: 4.6%; aOR 0.89, 95% CI 0.82 - 0.98), as well as major complications (2014: 28.6%, 2019: 23.3%; aOR 0.95, 95% CI 0.91 - 0.99). Furthermore, the proportion of TbO increased (2014: 49.1%, 2019: 58.3%; aOR 1.05, 95% CI 1.01 - 1.10). In both the EVAR and OSR group, the proportion of patients with cardiac comorbidity increased. CONCLUSION: Since the establishment of this nationwide quality improvement initiative (DSAA), all outcomes of iAAA repair following EVAR and OSR have improved, except for peri-operative mortality following EVAR which remained unchanged.

Published
2022

18. West Salym ASP Pilot: Project Front-End Engineering

Author

Karpan, V. M., additional, Volokitin, Y. I, additional, Shuster, M. Y., additional, Tigchelaar, W.., additional, Chmuzh, I. V., additional, Koltsov, I. N., additional, Tkachev, I. V., additional, van Batenburg, D. W., additional, Faber, M. J., additional, and Skripkin, A.., additional

Published
2014
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22. Prevalence and Prescribed Treatments of Orthostatic Hypotension in Institutionalized Patients with Parkinson's Disease.

Author

Hommel, A. L. A. J., Faber, M. J., Weerkamp, N. J., van Dijk, J. G., Bloem, B. R., and Koopmans, R. T.

Subjects
*ORTHOSTATIC hypotension treatment, *PARKINSON'S disease patients, *DISEASE prevalence, *DOMPERIDONE, *ORTHOSTATIC intolerance, *THERAPEUTICS
Abstract

Background: Orthostatic hypotension (OH) in Parkinson's disease (PD) is a common non-motor sign that can be hard to recognize and treat. OH prevalence and treatment in institutionalized PD-patients remains unknown. Objective: The aim of this study was to explore the prevalence and prescribed treatments of OH in institutionalized patients with PD. Method: A cross-sectional study of nursing homes in the south-east of the Netherlands identified 64 residents with PD (inclusion criteria: MMSE >18). Assessments included blood pressure measurement, both supine and in the upright position (after 1 minute and after 3 minutes of standing), and 2 questions on cardiovascular items including falls of the validated Non-Motor Symptom Scale (NMSS).OHwas defined according to the consensus guidelines.OHwas considered as 'probably symptomatic' if patients had a concomitant frequency score >1 on the selected NMSS items, and 'probably asymptomatic' for a frequency score of 0. If OH was not present, but patients had a frequency score >1, OH was considered as 'possibly symptomatic'. Results: The prevalence of OH was 51.6%, almost equally divided into probably symptomatic and probably asymptomatic cases. Another 20.6% had possibly symptomatic OH. Importantly, only two patients with symptomatic OH had an OH diagnosis noted in their medical records. Five received domperidone, one received fludrocortison and none received midodrine. Conclusion: One half of institutionalized PD patients had OH, of whom half were probably symptomatic. OH was rarely noted in the medical records, suggesting underdiagnosis. Finally, OH was rarely treated, suggesting undertreatment. [ABSTRACT FROM AUTHOR]

Published
2016
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23. PSYCHOLOGY AND COUNSELLING

Author

Haica, C., primary, Melo, C., additional, Gameiro, S., additional, Canavarro, M. C., additional, Boivin, J., additional, Camus, M., additional, De Brucker, M., additional, Haentjens, P., additional, Verheyen, G., additional, Collins, J., additional, Tournaye, H., additional, Sart, Z., additional, Belen, S., additional, Ertuzun, I., additional, Borkan, B., additional, Koksal, F., additional, Jiskoot, L. G., additional, de Niet, J. E., additional, van Busschbach, J. J., additional, van Stigt, V. W. H. C., additional, van Egmond, A. M. E., additional, Verbiest, A. C. M., additional, Nugteren, S., additional, de Klerk, C., additional, Laven, J. S. E., additional, Galhardo, A., additional, Cunha, M., additional, Pinto-Gouveia, J., additional, Ludwig, O., additional, Ludwig, S., additional, Kentenich, H., additional, Kadota, T., additional, Terada, S., additional, Yoshioka, N., additional, Habara, T., additional, Hayashi, N., additional, Jung, J. H., additional, Won, M. Y., additional, Shin, Y. K., additional, Kang, Y. J., additional, Lee, D. H., additional, Kim, J. W., additional, Yang, S. H., additional, Lim, J. H., additional, Aarts, J., additional, van Oers, A. M., additional, Faber, M. J., additional, Nelen, W. L., additional, van Dulmen, A. M., additional, Kremer, J. A. M., additional, EL Gelany, S., additional, Khalifa, H., additional, Nehir, A., additional, Cali, H., additional, Yuksel, B., additional, Gungor Ugurlucan, F., additional, Bastu, E., additional, and Ergun, B., additional

Published
2012
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35. Coronary Artery Dilatation and Aortic Outflow Tract Enlargement in Children with Unicommissural Aortic Valves.

Author

Faber, M. J., Zeiger, J. S., Spevak, P. J., Brenner, J. I., and Ravekes, W. J.

Subjects
*HEART dilatation, *CORONARY disease, *AORTIC valve insufficiency, *HEART blood-vessels, *HEART diseases, *PEDIATRIC cardiology, *CARDIOLOGY
Abstract

We evaluated the aortic outflow tract (AOT) and coronary artery dimensions in pediatric patients with unicommissural aortic valves. A retrospective review of an echocardiographic database identified 37 patients with unicommissural aortic valves. A total of 115 echocardiograms were reviewed, and the right coronary artery (RCA), left main coronary artery (LM), left anterior descending coronary artery aortic valve annulus., aortic root, sinotubular junction (STJ), and ascending aorta were measured and r scores determined. The aortic stenosis peak gradient and the amount of aortic regurgitation (AR) were also measured. The RCA diameter (z score, 1.85 ± 1.8, p = 0.03) and LM diameter (r score, 1.74 ± 1.47, p = 0.04) are significantly dilated, as are all the AOT measurements; aortic annulus (2.02 ± 1.9, p = 0.02), aortic root (2.25 ± 1.9, p = 0.02), STJ (2.22 ± 1.74, p = 0.01), and ascending aorta (4.38 ± 2.03, p < 0.001). Longitudinal follow-up showed that there was no significant variation over time in any variable. The AOT measurements were significantly correlated with each other. A trend was found in which an increasing amount of AR gave an increase in AOT measurements. The aortic gradient was not significantly associated with any measurement. Our study population demonstrated significant dilatation of the RCA and LM as well as the AOT. The dilatation of the AOT structures is likely caused by the same mechanism that accounts for the AOT dilatation in patients with bicommissural aortic valves. Dilatation of the coronary arteries may represent an intrinsic abnormality in the vessel wall. Further studies are needed to define possible changes. [ABSTRACT FROM AUTHOR]

Published
2005
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36. Folic acid and vitamin B12status of vervet monkeys used for nutritional research

Author

Venter, F. S., Cloete, H., Seier, J. V., Faber, M. J., and Fincham, J. E.

Abstract

Plasma and red blood cell (RBC) folic acid levels, as well as plasma vitamin B12levels were determined in Vervet monkeys (Cercopithecus aethiops). All the vervets were apparently healthy and without symptoms or lesions typical of folic acid and/or vitamin B12deficiencies. Competitive protein binding radioassays were used to determine folate and vitamin B12values in animals fed 4 different diets. The B12levels for all the groups ranged between 866 and 5867 pg/ml and showed an inverse relationship with the FA measurements. The lowest mean RBC folic acid content in a group fed an atherogenic diet for 3 years was 12·8 ng/ml. For the other 3 diets, mean RBC folic acid levels were 90·7, 132·3 and 152·8 ng/ml, respectively.A megadose of 25·6 mg of folic acid per day for 99 days was given to 3 adult males. No obvious toxic effects were observed in these animals although mean RBC folic acid levels increased to 1013 ng/ml.

Published
1993
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38. Ordination of zooplankton community data to detect pesticide effectsin pond enclosures

Author

Kreutzweiser, D. P. and Faber, M. J.

Subjects
ZOOPLANKTON, PRINCIPAL components analysis, POLLUTION, PESTICIDES
Abstract

Trends in community structure of crustacean zooplankton among 17 forest pond enclosures (5 m x 5 m x 1 m deep) were examined and analyzed to determine effects of two candidate forest pesticides. Eight enclosures were treated at two concentrations of an experimental insecticide, tebufenozide; five were treated at two concentrations of a biological herbicide, bialaphos; and four served as controls. Zooplankton community structure was characterized by ordination of species assemblages using principle components analysis (PCA) and correspondence analysis (CA). Two-dimensional plots of the first two axes from PCA andCA were constructed to explore temporal and treatment-related patterns in community structure. The first four axes of both ordination functions were used as multivariate descriptors of community structure and were examined for differences among treatments by ANOVA. Species ordination plots and sorted rotated factor loadings provided objectivemeans of identifying the species important in determining divergencein community structure. These were considered indicator species and were examined for differences among treatments by ANOVA and specifiedcontrasts. The ordination and subsequent analysis revealed trends incommunity structure and sample differences that indicated clear, concentration-dependent effects of bialaphos and equivocal effects of tebufenozide. [ABSTRACT FROM AUTHOR]

Published
1999
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39. Impact of glufosinate-ammonium and bialaphos on the phytoplankton community of a small eutrophic northern lake

Author

Thompson, D. G., Faber, M. J., Stephenson, G. R., and Boermans, H. J.

Subjects
*HERBICIDES, *PHYTOPLANKTON, *POLLUTION
Abstract

The impact of glufosinate-ammonium and bialaphos on the phytoplankton community in a shallow eutrophic take ecosystem was investigated using in situ enclosures. Flow cytometry was used to size phytoplanktoncells and sort them as live or dead, depending upon their chlorophyll a autofluorescence intensity. Flow cytometric analyses provided significantly (p < 0.00 1) higher abundance estimates as compared to conventional microscopic analyses. At the highest treatment levels (10 mg/L), both herbicides caused a significant but transient reduction inlive phytoplankton cells (days 3-14), which was particularly apparent in the small (1-2 and 2-3 mu m) classes. Transient impacts on phytoplankton live cell abundances were mirrored by depression in dissolved oxygen content in the treated enclosures. At an application rate of10 mg/L, abundance of smaller phytoplankton in the bialaphos-treatedenclosures recovered more rapidly (14 d) than those in the glufosinate-ammonium-treated enclosures (49 d). For days of maximal impact, estimated median effect concentrations (EC50) for reduction of phytoplankton abundance ranged from 2.5 to 3.4 mg/L for glufosinate-ammonium and 3.3 to 8.1 mg/L for bialaphos, whereas estimates of concentrationinducing 20% reductions in abundance (EC20; 0.9-1.2 and 1.6-4 mg/L, respectively) more closely approximated the expected environmental concentration (1 mg/L), assuming direct overspray into water bodies of 15-cm depth. [ABSTRACT FROM AUTHOR]

Published
1998

40. Cryopreservation of fluorescent marker-labeled algae (Selenastrum capricornutum) for toxicity testing using flow cytometry

Author

Boermans, H. J., Thompson, D. G., Stephenson, G. R., Solomon, K. R., Faber, M. J., and Smith, L. M. J.

Subjects
TOXICOLOGY
Abstract

A rapid, two-stain (fluorescein diacetate and ethidium homodimer-1) flow cytometric assay to evaluate viability and cytotoxicity of the alga Selenastrum capricornutum in preserved samples is described. For storage, stained cells were fixed in glutaraldehyde, flash frozen in liquid nitrogen, and stored frozen (-20 deg.C) for assessment at a later date. Weekly analysis of frozen samples showed that fluorescence was stable for 7 weeks. A mixture of 50% healthy and 50% heat-killed cells of S. capricornutum showed 36.1% healthy cells, 13.2% compromised cells, 12% nonstained cells, and 38.7% dead cells. This technique was tested using sodium dodecyl sulfate (SDS) and phenol as toxicants. Threshold concentrations for toxicant impact were in the range of 1to 10 mg/L for SDS and 10 to 100 mg/L for phenol. Estimates of mortality showed 96-h median lethal concentration (LC50) values of 2,340 mg/L and 6,970 mg/L for SDS and phenol, respectively. This two-stain flow cytometric procedure has proven to be a reliable, sensitive assayfor determining viability of S. capricornutum in preserved samples. The sensitivity of this dual-color assay and the ability to store samples for later analysis are significant improvements over current techniques. [ABSTRACT FROM AUTHOR]

Published
1997

41. Editor's Choice - Nationwide Analysis of Patients Undergoing Iliac Artery Aneurysm Repair in the Netherlands.

Author

Jalalzadeh H, Indrakusuma R, Koelemay MJW, Balm R, Van den Akker LH, Van den Akker PJ, Akkersdijk GJ, Akkersdijk GP, Akkersdijk WL, van Andringa de Kempenaer MG, Arts CH, Avontuur JA, Baal JG, Bakker OJ, Balm R, Barendregt WB, Bender MH, Bendermacher BL, van den Berg M, Berger P, Beuk RJ, Blankensteijn JD, Bleker RJ, Bockel JH, Bodegom ME, Bogt KE, Boll AP, Booster MH, Borger van der Burg BL, de Borst GJ, Bos-van Rossum WT, Bosma J, Botman JM, Bouwman LH, Breek JC, Brehm V, Brinckman MJ, van den Broek TH, Brom HL, de Bruijn MT, de Bruin JL, Brummel P, van Brussel JP, Buijk SE, Buimer MG, Burger DH, Buscher HC, den Butter G, Cancrinus E, Castenmiller PH, Cazander G, Coveliers HM, Cuypers PH, Daemen JH, Dawson I, Derom AF, Dijkema AR, Diks J, Dinkelman MK, Dirven M, Dolmans DE, van Doorn RC, van Dortmont LM, van der Eb MM, Eefting D, van Eijck GJ, Elshof JW, Elsman BH, van der Elst A, van Engeland MI, van Eps RG, Faber MJ, de Fijter WM, Fioole B, Fritschy WM, Geelkerken RH, van Gent WB, Glade GJ, Govaert B, Groenendijk RP, de Groot HG, van den Haak RF, de Haan EF, Hajer GF, Hamming JF, van Hattum ES, Hazenberg CE, Hedeman Joosten PP, Helleman JN, van der Hem LG, Hendriks JM, van Herwaarden JA, Heyligers JM, Hinnen JW, Hissink RJ, Ho GH, den Hoed PT, Hoedt MT, van Hoek F, Hoencamp R, Hoffmann WH, Hoksbergen AW, Hollander EJ, Huisman LC, Hulsebos RG, Huntjens KM, Idu MM, Jacobs MJ, van der Jagt MF, Jansbeken JR, Janssen RJ, Jiang HH, de Jong SC, Jongkind V, Kapma MR, Keller BP, Khodadade Jahrome A, Kievit JK, Klemm PL, Klinkert P, Knippenberg B, Koedam NA, Koelemay MJ, Kolkert JL, Koning GG, Koning OH, Krasznai AG, Krol RM, Kropman RH, Kruse RR, van der Laan L, van der Laan MJ, van Laanen JH, Lardenoye JH, Lawson JA, Legemate DA, Leijdekkers VJ, Lemson MS, Lensvelt MM, Lijkwan MA, Lind RC, van der Linden FT, Liqui Lung PF, Loos MJ, Loubert MC, Mahmoud DE, Manshanden CG, Mattens EC, Meerwaldt R, Mees BM, Metz R, Minnee RC, de Mol van Otterloo JC, Moll FL, Montauban van Swijndregt YC, Morak MJ, van de Mortel RH, Mulder W, Nagesser SK, Naves CC, Nederhoed JH, Nevenzel-Putters AM, de Nie AJ, Nieuwenhuis DH, Nieuwenhuizen J, van Nieuwenhuizen RC, Nio D, Oomen AP, Oranen BI, Oskam J, Palamba HW, Peppelenbosch AG, van Petersen AS, Peterson TF, Petri BJ, Pierie ME, Ploeg AJ, Pol RA, Ponfoort ED, Poyck PP, Prent A, Ten Raa S, Raymakers JT, Reichart M, Reichmann BL, Reijnen MM, Rijbroek A, van Rijn MJ, de Roo RA, Rouwet EV, Rupert CG, Saleem BR, van Sambeek MR, Samyn MG, van 't Sant HP, van Schaik J, van Schaik PM, Scharn DM, Scheltinga MR, Schepers A, Schlejen PM, Schlosser FJ, Schol FP, Schouten O, Schreinemacher MH, Schreve MA, Schurink GW, Sikkink CJ, Siroen MP, Te Slaa A, Smeets HJ, Smeets L, de Smet AA, de Smit P, Smit PC, Smits TM, Snoeijs MG, Sondakh AO, van der Steenhoven TJ, van Sterkenburg SM, Stigter DA, Stigter H, Strating RP, Stultiëns GN, Sybrandy JE, Teijink JA, Telgenkamp BJ, Testroote MJ, The RM, Thijsse WJ, Tielliu IF, van Tongeren RB, Toorop RJ, Tordoir JH, Tournoij E, Truijers M, Türkcan K, Tutein Nolthenius RP, Ünlü Ç, Vafi AA, Vahl AC, Veen EJ, Veger HT, Veldman MG, Verhagen HJ, Verhoeven BA, Vermeulen CF, Vermeulen EG, Vierhout BP, Visser MJ, van der Vliet JA, Vlijmen-van Keulen CJ, Voesten HG, Voorhoeve R, Vos AW, de Vos B, Vos GA, Vriens BH, Vriens PW, de Vries AC, de Vries JP, de Vries M, van der Waal C, Waasdorp EJ, Wallis de Vries BM, van Walraven LA, van Wanroij JL, Warlé MC, van Weel V, van Well AM, Welten GM, Welten RJ, Wever JJ, Wiersema AM, Wikkeling OR, Willaert WI, Wille J, Willems MC, Willigendael EM, Wisselink W, Witte ME, Wittens CH, Wolf-de Jonge IC, Yazar O, Zeebregts CJ, and van Zeeland ML

Subjects
Aged, Aged, 80 and over, Endovascular Procedures methods, Endovascular Procedures mortality, Endovascular Procedures statistics & numerical data, Female, Guideline Adherence statistics & numerical data, Humans, Iliac Aneurysm epidemiology, Iliac Aneurysm mortality, Iliac Aneurysm pathology, Iliac Artery pathology, Iliac Artery surgery, Male, Netherlands epidemiology, Registries, Retrospective Studies, Sex Factors, Treatment Outcome, Iliac Aneurysm surgery
Abstract

Objective: The new 2019 guideline of the European Society for Vascular Surgery (ESVS) recommends consideration for elective iliac artery aneurysm (eIAA) repair when the iliac diameter exceeds 3.5 cm, as opposed to 3.0 cm previously. The current study assessed diameters at time of eIAA repair and ruptured IAA (rIAA) repair and compared clinical outcomes after open surgical repair (OSR) and endovascular aneurysm repair (EVAR)., Methods: This retrospective observational study used the nationwide Dutch Surgical Aneurysm Audit (DSAA) registry that includes all patients who undergo aorto-iliac aneurysm repair in the Netherlands. All patients who underwent primary IAA repair between 1 January 2014 and 1 January 2018 were included. Diameters at time of eIAA and rIAA repair were compared in a descriptive fashion. The anatomical location of the IAA was not registered in the registry. Patient characteristics and outcomes of OSR and EVAR were compared with appropriate statistical tests., Results: The DSAA registry comprised 974 patients who underwent IAA repair. A total of 851 patients were included after exclusion of patients undergoing revision surgery and patients with missing essential variables. eIAA repair was carried out in 713 patients, rIAA repair in 102, and symptomatic IAA repair in 36. OSR was performed in 205, EVAR in 618, and hybrid repairs and conversions in 28. The median maximum IAA diameter at the time of eIAA and rIAA repair was 43 (IQR 38-50) mm and 68 (IQR 58-85) mm, respectively. Mortality was 1.3% (95% CI 0.7-2.4) after eIAA repair and 25.5% (95% CI 18.0-34.7) after rIAA repair. Mortality was not significantly different between the OSR and EVAR subgroups. Elective OSR was associated with significantly more complications than EVAR (intra-operative: 9.8% vs. 3.6%, post-operative: 34.0% vs. 13.8%, respectively)., Conclusion: In the Netherlands, most eIAA repairs are performed at diameters larger than recommended by the ESVS guideline. These findings appear to support the recent increase in the threshold diameter for eIAA repair., (Copyright © 2020 European Society for Vascular Surgery. Published by Elsevier B.V. All rights reserved.)

Published
2020
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42. A randomized controlled efficacy study of the Medido medication dispenser in Parkinson's disease.

Author

Hannink K, Ter Brake L, Oonk NGM, Wertenbroek AA, Piek M, Vree-Egberts L, Faber MJ, van der Palen J, and Dorresteijn LD

Subjects
Aged, Aged, 80 and over, Antiparkinson Agents, Caregivers, Disabled Persons, Drug Administration Schedule, Drug Delivery Systems, Female, Follow-Up Studies, Health Status, Humans, Male, Medication Adherence, Middle Aged, Quality of Life, Treatment Outcome, Parkinson Disease drug therapy
Abstract

Background: Complex medication schedules in Parkinson's disease (PD) result in lower therapy adherence, which contributes to suboptimal therapy and clinical deterioration. Medication reminder systems might improve therapy adherence and subsequently improve symptoms of PD. This randomized controlled study assessed the effect of the electronic medication dispenser Medido on physical disability in PD, as a proxy for changes in therapy adherence.x METHODS: Eighty-seven patients were randomized into the Medido group or control group. The primary outcome of physical disability was measured by the AMC Linear Disability Scale (ALDS). Secondary outcomes were quality of life (QoL) (PDQ-39), health status (EQ5D-5L, VAS), non-motor symptoms (NMS-Quest), and QoL of the caregiver (PDQ-carer). Measurements were performed at baseline, and after 3 and 6 months follow-up., Results: When using the Medido, a non-significant improvement of 3.0 points (95% CI -5.6;11.6) was seen in ALDS. The exploratory subgroup Hoehn & Yahr classification (H&Y) > 2.5 improved significantly on ALDS with 14.7 points (95% CI -28.5;-0.9, p = 0.029 for group x time interaction). QoL deteriorated with 1.0 point in PDQ-39 (p = 0.01 for group x time interaction) in favor of the control group. Non-significant differences were observed for VAS (0.4 points, p = 0.057) and NMS-Quest (1.3 points, p = 0.095) in favor of the Medido group. No changes over time were observed in EQ5D-5L and PDQ-carer., Conclusions: Based on these data, no firm conclusion can be drawn, but use of the Medido medication dispenser may result in a clinical improvement of physical disability and seems particularly appropriate for more severe patients., Trial Registration: NTR3917 . Registered 19 March 2013.

Published
2019
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43. Oral & Maxillofacial surgery is ready for patient-centred eHealth interventions - the outcomes of a scoping review.

Author

van den Bosch SC, van de Voort NEM, Xi T, Kool RB, Bergé SJ, and Faber MJ

Subjects
Dental Care, Humans, Outcome Assessment, Health Care, Surgery, Oral, Telemedicine
Abstract

Within the field of oral and maxillofacial (OMF) surgery, eHealth is expected to be a tool to improve quality of care. The aim of this study is to map the research of patient-centred eHealth interventions within OMF surgery by means of a scoping review. After a systematic literature search, relevant studies on patient-centred eHealth interventions for OMF-surgery patients were selected. The interventions were mapped based on their key components, target population and outcome measures. To gain insight in the research phase of evaluation, the framework of the Medical Research Council (MRC) was used. Forty-one papers were included, comprising 34 unique interventions. Nineteen interventions were designed for head and neck cancer patients, 11 interventions concernd video-teleconsultation. According to the MRC framework, 26 papers fitted into the feasibility and piloting phase of research, 8 into the evaluation phase, 7 were in the development phase. No implementation studies were found. This scoping review can be a starting point for those who are interested in applying and evaluating eHealth in their practice. Since many feasibility and pilot studies were found on similar interventions, a more extensive collaboration with and connecting to each other is recommended to catalyze the implementation of eHealth in daily practice. Profound involvement of patients in developing and evaluating eHealth interventions is essential to achieve true patient-centred OMF surgery., (Copyright © 2018 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.)

Published
2019
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44. [Shared decision-making: dilemmas in daily practice].

Author

Nijhuis FAP, Faber MJ, Post B, and Bloem BR

Subjects
Humans, Decision Making, Patient Participation
Abstract

Shared decision-making is an essential - but often neglected - component of evidence-based medicine. In practice, doctors, nurses and patients encounter dilemmas which are understandable, but not insurmountable. We illustrate this by means of a complex decision concerning therapy in the advanced stage of Parkinson's disease. Evidence of effectiveness differs with each individual therapy, and, in practice, the experiences of neurologists also vary widely. In addition, the various treatment strategies all require a different sort of daily care, and have differing impacts on people's lives. It is time that we worked towards a realistic view of shared decision-making. Shared decision-making cannot be generalised to a 'one size fits all' strategy that we can choose to apply or not to apply at will. It should be a flexible instrument which, depending on the individual and the specific situation, can be put to use to deliver the best tailored care.

Published
2017

45. [Volume standards: quality through quantity? relationship between treatment volume and outcomes not well founded].

Author

Mesman R, Faber MJ, Westert GP, and Berden B

Subjects
Evidence-Based Medicine, Humans, Netherlands, Workload, Outcome and Process Assessment, Health Care, Quality Indicators, Health Care, Quality of Health Care
Abstract

Three domains are accepted as indicators that make the quality of hospital care quantifiable and transparent: process, structure and outcome. In recent years volume thresholds for surgical interventions have been added as new quality indicators, rendering the assumption that more volume leads to better outcomes. This assumption has been established for many procedures in peer-reviewed literature since the 1970s. Although there is consensus about the fact that volume is a proxy measure for other factors influencing the outcome of care, available research does not shed much light on the mechanisms underlying the volume-outcome relationship. Moreover, the methodological quality of the available research has several limitations. Despite the incomplete substantiation, volume thresholds are now embedded in 'risk-based' supervision by the health inspectorate as well as purchasing policies by health insurers.

Published
2013

46. Patient-focused internet interventions in reproductive medicine: a scoping review.

Author

Aarts JW, van den Haak P, Nelen WL, Tuil WS, Faber MJ, and Kremer JA

Subjects
Counseling, Health Promotion methods, Humans, Infertility psychology, Mental Health, Reproductive Medicine, Self-Help Groups, Infertility therapy, Internet
Abstract

Background: The Internet has revolutionized fertility care since it became a popular source of information and support for infertile patients in the last decade. The aim of this scoping review is to map (i) the main categories of patient-focused Internet interventions within fertility care, (ii) the detailed composition of the interventions and (iii) how these interventions were evaluated., Methods: A literature search used various 'Internet' and 'Infertility' search terms to identify relevant studies published up to 1 September 2011. The selected studies had to include patients facing infertility and using an infertility-related Internet intervention. We charted data regarding categories of interventions, components of interventions and evaluation methodology. We categorized the stages of research using the UK's Medical Research Council framework for evaluating complex interventions., Results: We included 20 studies and identified 3 educational interventions, 2 self-help interventions, 1 human-supported therapeutic intervention, 9 online support groups and 2 counselling services. Information provision, support and mental health promotion were common aims. Few interactive online components were present in the online programmes. Three studies were in the pilot phase and 17 were in the evaluation phase., Conclusions: Several categories of patient-focused Internet-based interventions in fertility care are primarily applied to provide support and education and promote mental health. The interventions could be improved by using more interactive and dynamic elements as their key components. Finally, more emphasis on methodological standards for complex interventions is needed to produce more rigorous evaluations. This review shows where further development or research into patient-focused Internet interventions in fertility-care practice may be warranted.

Published
2012
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47. Professionals' perceptions of their patients' experiences with fertility care.

Author

Aarts JW, Faber MJ, van Empel IW, Scheenjes E, Nelen WL, and Kremer JA

Subjects
Adult, Cross-Sectional Studies, Female, Humans, Infertility therapy, Male, Middle Aged, Patient-Centered Care, Quality of Health Care, Attitude of Health Personnel, Patient Satisfaction, Reproductive Techniques, Assisted psychology, Social Perception
Abstract

Background: Patient-centredness is one of the core dimensions of quality of care. It can be monitored with surveys measuring patients' experiences with care. The objective of the present study was to determine to what extent gynaecologists, physicians specializing in infertility and nurses can estimate the level of patient-centredness of their clinic., Methods: A random sample of 1189 couples with fertility problems and 194 physicians and nurses from 29 Dutch fertility clinics participated in this cross-sectional study. Differences between patients' experiences with fertility care and professionals' perceptions of these experiences as measured with the patient-centredness questionnaire-infertility (PCQ-infertility) were calculated. The questionnaire's structure, comprising one total scale (level 1), seven subscales (level 2) and 46 single items (level 3), was used as a framework., Results: Response rates were 75% (n = 888) in the patient sample and 83% (n = 160) in the professional sample. Independent sample t-tests, corrected for multiple comparisons with the Bonferroni correction method (P < 0.05), showed no significant differences in mean scores on the total scale of patient-centredness for either professionals or patients. At level 2, professionals underestimated most subscales, namely, 'Accessibility', 'Communication', 'Patient involvement' and 'Competence', whereas 'Continuity of care' was overestimated. Professionals significantly and clinically relevantly misjudged 29 care aspects., Conclusions: Professionals within fertility care cannot adequately evaluate their performance regarding patient-centredness, and specifically the care aspects to which their own patients attribute the greatest improvement potential. Providing detailed feedback might start improvement of patient-centredness and quality of care.

Published
2011
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48. Long-term follow-up of manipulative treatment in a horse with back problems.

Author

Faber MJ, van Weeren PR, Schepers M, and Barneveld A

Subjects
Animals, Female, Horses, Range of Motion, Articular, Scoliosis physiopathology, Scoliosis therapy, Severity of Illness Index, Thoracic Vertebrae, Horse Diseases physiopathology, Horse Diseases therapy, Manipulation, Spinal veterinary, Scoliosis veterinary
Abstract

In order to objectively quantify the effect of manipulation on back-related locomotion anomalies in the horse, a recently developed kinematic measuring technique for the objective quantification of thoracolumbar motion in the horse was applied in a dressage horse that was suffering from a back problem. In this horse, clinically, a right-convex bending (scoliosis) from the 10th thoracic vertebra to the second lumbar vertebra was diagnosed. As a result, there was a marked asymmetric movement of the thoracolumbar spine. Functionally, there was severe loss of performance. Thoracolumbar motion was measured in terms of ventrodorsal flexion, lateral flexion, and axial rotation using an automated gait analysis system. Measurements were repeated before and 2 days after treatment, before the second treatment 3 weeks later, and at 4 weeks and 8 months after the second treatment to assess long-term effect. At the same time, performance of the horse was assessed subjectively by the trainer as well. Symmetry of movement improved dramatically after the first treatment. After this, there was a slight decrease in symmetry, but 8 months after the last treatment the symmetry indexes for the various joints were still considerably better than during the first (pre-treatment) measuring session. Subjectively, the trainer did not notice improvement until after measurement session 4. Between sessions 4 and 5 (at 4 weeks and 8 months after the second treatment) there was a change of trainer. The new trainer did not report any back problem, and succeeded in bringing the horse back to its former level in competition. It is concluded that manipulation had a measurable influence on the kinematics of the thoracolumbar spine. However, it is recognized that an improvement in symmetry of motion is not equivalent to clinical improvement and that other measures, such as changes in management, may be more decisive.

Published
2003
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49. Determination of 3D spinal kinematics without defining a local vertebral coordinate system.

Author

Faber MJ, Schamhardt HC, and van Weeren PR

Subjects
Biomechanical Phenomena, Evaluation Studies as Topic, Humans, Models, Biological, Rotation, Locomotion physiology, Spine physiology
Abstract

In this paper a method is presented to calculate Euler's angles of rotation of a body segment during locomotion without a priori defining the location of the center of rotation, and without defining a local vertebral coordinate system. The method was applied to in vivo spinal kinematics. In this method, the orientation of each segment is identified by a set of three markers. The orientation of the axes of rotation is calculated based on the average position of the markers during one stride cycle. Some restrictions and assumptions should be made. The approach is viable only when the average orientation of the anatomical axes of rotation of each spinal segment during a stride cycle coincides with the three axes of the laboratory coordinate system. Furthermore, the rotations should be symmetrical with respect to both sides of the plane of symmetry of the spinal segment, and the subject should move parallel to one axis of the laboratory coordinate system. Since in experimental conditions these assumptions will only be met approximately, errors will be introduced in the calculated angles of rotation. The magnitude of the introduced errors was investigated in a computer simulation experiment. Since the maximal errors did not exceed 0.7 degrees in a range of misalignments up to 10 degrees between the two coordinate systems, the approach proved to be a valid method for the estimation of spinal kinematics.

Published
1999
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50. Egg supplementation to combat undernutrition.

Author

Tichelaar HY, Benadé AJ, Faber MJ, and Marais CD

Subjects
Child, Fatty Acids analysis, Humans, Diet, Eggs analysis, Nutrition Disorders prevention & control
Published
1994

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