1,720,967 research outputs found
Pressure transducers in clinical and laboratory practice : a short critical review
No full textCITATION: Fourie, P. R., Badenhorst, E. & Coetzee, A. R. 1987. Drukomsetters in die kliniese en navorsingspraktyk : 'n kort kritiese beskouing. South African Medical Journal, 71:651-654.The original publication is available at http://www.samj.org.zaThe correct measurement of various blood pressures in clinical practice is of obvious importance. A method by which the frequency response and damping of various transducers and catheters can be determined is discussed and reference is made to values obtained in the validation of certain catheters.Publisher’s versio
Oxygen balance in normal canine myocardium with incremental inhalational anaesthesia
No full textThe original publication is available at http://www.samj.org.zaCITATION: Coetzee, A. R. et al. 1988. Die suurstofbalans in die normale hondmiokardium gedurende toenemende konsentrasies van inhalasienarkosemiddels. South African Medical Journal, 73:303-306.Myocardial oxygen supply and demand in the normal dog were evaluated as the concentration of halothane, enflurane or isoflurane was increased. Although coronary blood flow decreased as the anaesthetic gas concentration increased, the O2 supply-to-demand ratio remained stable owing to a decrease in the myocardial O2 consumption.Publisher’s versio
Rural anaesthetic practices in the Western Cape
Get PDFCITATION: Payne, K. A., Muller, C. J. B. & Coetzee, A. R. 1991. Rural anaesthetic practices in the Western Cape. South African Medical Journal, 80:21-22.The original publication is available at http://www.samj.org.zaThe findings of specialist anaesthetists on visits to rural towns in the western Cape over 6 years are reported. The importance of academic units communicating with general practitioners, nursing staff and hospital authorities in their own working environment is emphasised. Hospital anaesthetic facilities and general practice anaesthetic methods are discussed and recommendations made and, in addition, common problems that could improve anaesthesia in general practice are summarised.Publisher’s versio
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Pre-operative assessment of cardiac patients for non-cardiac surgery
No full textCITATION: Ford, B. M., Weich, H. F. H. & Coetzee, A. R. 1984. Pre-operative assessment of cardiac patients for non-cardiac surgery. South African Medical Journal, 65: 235-239.The original publication is available at http://www.samj.org.zaNon-cardiac surgery presents significant risks to patients with cardiac diseases. With the improvement in anaesthetic techniques and intensive care facilities, many cardiac patients who in the past would have been considered as being at too great a risk are now being considered for non-cardiac surgery. Smaller centres must still practice strict selection of patients if they do not possess an intensive care unit with facilities for full haemodynamic monitoring. We present a review of the recent literature and current practice at our hospital to assist clinicians in assessing these patients for anaesthesia. However, the final decision whether the patients is fit for anaesthesia still rests with the anaesthetist.Publisher’s versio
The load independence of the end-systolic pressure-length relationship of the heart
No full textCITATION: Coetzee, A. R., Fourie, P. R. & Badenhorst, E. 1989. The load independence of the end-systolic pressure-length relationship of the heart. South African Medical Journal, 76:191-194.The original publication is available at http://www.samj.org.zaThe end-systolic pressure-volume relationship is the state of the art in the measurement of myocardial contractility. This index is load-independent and relatively independent of heart rate. In this study the load-independent character of the end-systolic pressure-length (ESPL) relationship was evaluated in dogs under general anaesthesia. The result indicated that the ESPL is pre- and afterload-independent, since the comparative values of ESPL from afterloaded and reduced preload contractions did not differ significantly (N = 75; P = 0.5993). The application of the ESPL relationship as a means of describing the function of the heart as a muscle as well as a pump is discussed.Publisher’s versio
The effect of halothane, enflurane and isoflurane on the circulation
Get PDFCITATION: Coetzee, A. R., Fourie, P. R. & Badenhorst, E. 1989. The effect of halothane, enflurane and isoflurane on the circulation. South African Medical Journal, 76:417-421.The original publication is available at http://www.samj.org.zaThis study, in open-chest dogs, sought to explore the relationship between whole-body oxygen delivery and oxygen consumption during anaesthesia, using increasing concentrations of halothane, enflurane and isoflurane. Results indicate that the cardiac index and oxygen delivery became critical at less than 1 MAC (minimal alveolar concentration of anaesthetic) for the three commonly used vapours. Halothane caused the least depression of contractility, but the stroke volume was reduced by the well-maintained afterload at 1 MAC. Enflurane and isoflurane were associated with more depression of contractility, but the cardiac output was maintained by an increase in heart rate in the case of isoflurane and reduced mean arterial pressure during the use of enflurane.Publisher’s versio
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