Browsing by Author "Anthony, John"

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    The CRADLE vital signs alert : qualitative evaluation of a novel device designed for use in pregnancy by healthcare workers in low-resource settings
    (BioMed Central, 2018-01-05) Nathan, Hannah L.; Boene, Helena; Munguambe, Khatia; Sevene, Esperanca; Akeju, David; Adetoro, Olalekan O.; Charanthimath, Umesh; Bellad, Mrutyunjaya B.; De Greeff, Annemarie; Anthony, John; Hall, David R.; Steyn, Wilhelm; Vidler, Marianne; Von Dadelszen, Peter; Chappell, Lucy C.; Sandall, Jane; Shennan, Andrew H.
    Background: Vital signs measurement can identify pregnant and postpartum women who require urgent treatment or referral. In low-resource settings, healthcare workers have limited access to accurate vital signs measuring devices suitable for their environment and training. The CRADLE Vital Signs Alert (VSA) is a novel device measuring blood pressure and pulse that is accurate in pregnancy and designed for low-resource settings. Its traffic light early warning system alerts healthcare workers to the need for escalation of care for women with hypertension, haemorrhage or sepsis. This study evaluated the usability and acceptability of the CRADLE VSA device. Methods: Evaluation was conducted in community and primary care settings in India, Mozambique and Nigeria and tertiary hospitals in South Africa. Purposeful sampling was used to convene 155 interviews and six focus groups with healthcare workers using the device (n = 205) and pregnant women and their family members (n = 41). Interviews and focus groups were conducted in the local language and audio-recorded, transcribed and translated into English for analysis. Thematic analysis was undertaken using an a priori thematic framework, as well as an inductive approach. Results: Most healthcare workers perceived the CRADLE device to be easy to use and accurate. The traffic lights early warning system was unanimously reported positively, giving healthcare workers confidence with decision-making and a sense of professionalism. However, a minority in South Africa described manual inflation as tiring, particularly when measuring vital signs in obese and hypertensive women (n = 4) and a few South African healthcare workers distrusted the device’s accuracy (n = 7). Unanimously, pregnant women liked the CRADLE device. The traffic light early warning system gave women and their families a better understanding of the importance of vital signs in pregnancy and during the postpartum period. Conclusion: The CRADLE device was well accepted by healthcare workers from a range of countries and levels of facility, including those with no previous vital signs measurement experience. The device motivated women to attend primary care and encouraged them to accept treatment and referral.
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    The justfiable limitations of patient autonomy in contemporary South African medical practice
    (Stellenbosch : University of Stellenbosch, 2009-12) Anthony, John; Van Niekerk, Anton A.; University of Stellenbosch. Faculty of Arts and Social Sciences. Dept. of Philosophy.
    ABSTRACT: The European Enlightenment secured man’s freedom from doctrinal thought. Scientific progress and technological innovation flourished in the 18th Century, radically changing the lives of all. Man’s mastery and transformation of his environment was matched by revolutionary political reform, resulting in the dissolution of empire and the transfer of power into the hands of the people. Social transformation saw the city-states of pre-modern man supplanted by a globalized community whose existence grew from time and space distantiation facilitated by the new technologies and the development of symbolic forms. These sweeping social, political and ideological changes of the 18th Century fostered the belief that man’s transformative authority was indeed his to command. Man believed he had a right to self-governance and to autonomous decision-making. Kant described moral autonomy as the freedom men have to show rational accountability for their actions and he saw in men a dignity beyond all price because of this moral autonomy. Personal autonomy is seen as the expression of the free will of individuals and is justifiably constrained by the need to respect the interests and agency of others. The principle of autonomy, in the context of medical practice, was not clearly articulated until the early 20th century. Prior to this, the ethical practice of medicine relied upon the beneficent intentions of the practitioners. The limits to patient autonomy have been delineated largely by issues of social justice based upon the need to share scarce resources fairly among members of society. However, autonomy remains a dominant principle and is most clearly exemplified by the process of informed consent obtained prior to any medical intervention. This thesis provides a conceptual analysis of autonomy in the context of informed consent. Following this, several different clinical scenarios are examined for evidence of justifiable limitations to patient autonomy. Each scenario is examined in the light of different moral theories including deontology, utilitarianism, communitarianism and principlist ethical reasoning. Kantian ethical reasoning is found to be resilient in rejecting any limitation to the autonomy principle whereas each of the other theories allow greater scope for morally-justified curtailment of individual autonomy. The thesis concludes with reflection on post-modern society in which the radicalization of what began with the European Enlightenment sees the transformation of pre-modern society into a global community in which epistemological certainty is no longer available. In this environment, the emerging emphasis on global responsibility requires ethical accountability, not only when individuals secure transactions between one another but also between individuals and unknown communities of men and women of current and future generations. The thesis concludes that patient autonomy is justifiably limited in South African medical practice because of issues related to social justice but that the impact of the new genetic technologies and post-modernity itself may in future set new limits to individual patient autonomy.
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    Maternal and perinatal adverse outcomes in women with pre-eclampsia cared for at facility-level in South Africa : a prospective cohort study
    (Edinburgh University Global Health Society, 2018) Nathan, Hannah L.; Seed, Paul T.; Hezelgrave, Natasha L.; De Greeff, Annemarie; Lawley, Elodie; Conti-Ramsden, Frances; Anthony, John; Steyn, Wilhelm; Hall, David R.; Chappell, Lucy C.; Shennan, Andrew H.
    Background: Hypertensive disorders of pregnancy contribute to 14% of all maternal deaths, the majority of which occur in low- and middle-income countries. The aim of the study was to describe the maternal and perinatal clinical outcomes of women with pre-eclampsia living in middle- and low-income countries. Methods The study was a prospective observational study of women with pre-eclampsia (n = 1547, 42 twin pregnancies) at three South African tertiary facilities. Using stepwise logistic regression model area under the receiver operating characteristic curve (AUROC) values, the association between maternal baseline and admission characteristics and risk of adverse outcomes was evaluated. Main outcome measures were eclampsia, kidney injury and perinatal death. Results In 1547 women with pre-eclampsia, 16 (1%) died, 147 (9.5%) had eclampsia, four (0.3%) had a stroke and 272 (17.6%) had kidney injury. Of the 1589 births, there were 332 (21.0%) perinatal deaths; of these, 281 (84.5%) were stillbirths. Of 1308 live births, 913 (70.0%) delivered <37 completed weeks and 544 (41.7%) delivered <34 weeks’ gestation. Young maternal age (AUROC = 0.76, 95% confidence interval (CI) = 0.71- 0.80) and low Body Mass Index BMI (AUROC 0.65, 95% CI = 0.59-0.69) were significant predictors of eclampsia. Highest systolic blood pressure had the strongest association with kidney injury, (AUROC = 0.64, 95% CI = 0.60-0.68). Early gestation at admission was most strongly associated with perinatal death (AUROC = 0.81, 95% CI = 0.77-0.84). Conclusions The incidence of pre-eclampsia complications, perinatal death and preterm delivery in women referred to tertiary care in South Africa was much higher than reported in other low- and middle-income studies and despite access to tertiary care interventions. Teenage mothers and those with low BMI were at highest risk of eclampsia. This information could be used to inform guidelines, the research agenda and policy.
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    PROTEA, a Southern African multicenter congenital heart disease registry and biorepository: rationale, design, and initial results
    (Frontiers Media S.A., 2021-10) Aldersley, Thomas; Lawrenson, John; Human, Paul; Shaboodien, Gasnat; Cupido, Blanche; Comitis, George; De Decker, Rik; Fourie, Barend; Swanson, Lenise; Joachim, Alexia; Magadla, Phaphama; Ngoepe, Malebogo; Swanson, Liam; Revell, Alistair; Ramesar, Raj; Brooks, Andre; Saacks, Nicole; De Koning, Bianca; Sliwa, Karen; Anthony, John; Osman, Ayesha; Keavney, Bernard; Zühlke, Liesl
    Objectives: The PartneRships in cOngeniTal hEart disease (PROTEA) project aims to establish a densely phenotyped and genotyped Congenital Heart Disease (CHD) cohort for southern Africa. This will facilitate research into the epidemiology and genetic determinants of CHD in the region. This paper introduces the PROTEA project, characterizes its initial cohort, from the Western Cape Province of South Africa, and compares the proportion or “cohort-prevalences” of CHD-subtypes with international findings. Methods: PROTEA is a prospective multicenter CHD registry and biorepository. The initial cohort was recruited from seven hospitals in the Western Cape Province of South Africa from 1 April 2017 to 31 March 2019. All patients with structural CHD were eligible for inclusion. Descriptive data for the preliminary cohort are presented. In addition, cohort-prevalences (i.e., the proportion of patients within the cohort with a specific CHD-subtype) of 26 CHD-subtypes in PROTEA's pediatric cohort were compared with the cohort-prevalences of CHD-subtypes in two global birth-prevalence studies. Results: The study enrolled 1,473 participants over 2 years, median age was 1.9 (IQR 0.4–7.1) years. Predominant subtypes included ventricular septal defect (VSD) (339, 20%), atrial septal defect (ASD) (174, 11%), patent ductus arteriosus (185, 11%), atrioventricular septal defect (AVSD) (124, 7%), and tetralogy of Fallot (121, 7%). VSDs were 1.8 (95% CI, 1.6–2.0) times and ASDs 1.4 (95% CI, 1.2–1.6) times more common in global prevalence estimates than in PROTEA's pediatric cohort. AVSDs were 2.1 (95% CI, 1.7–2.5) times more common in PROTEA and pulmonary stenosis and double outlet right ventricle were also significantly more common compared to global estimates. Median maternal age at delivery was 28 (IQR 23–34) years. Eighty-two percent (347/425) of mothers used no pre-conception supplementation and 42% (105/250) used no first trimester supplements. Conclusions: The cohort-prevalence of certain mild CHD subtypes is lower than for international estimates and the cohort-prevalence of certain severe subtypes is higher. PROTEA is not a prevalence study, and these inconsistencies are unlikely the result of true differences in prevalence. However, these findings may indicate under-diagnosis of mild to moderate CHD and differences in CHD management and outcomes. This reemphasizes the need for robust CHD epidemiological research in the region.
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    Shock index thresholds to predict adverse outcomes in maternal hemorrhage and sepsis : a prospective cohort study
    (Wiley, 2019) Nathan, Hannah L.; Seed, Paul T.; Hezelgrave, Natasha L.; De Greeff, Annemarie; Lawley, Elodie; Anthony, John; Steyn, Wilhelm; Hall, David R.; Chappell, Lucy C.; Shennan, Andrew H.
    Introduction: Shock index (SI) is a predictor of hemodynamic compromise in obstetric patients. The SI threshold for action is not well understood. We aimed to evaluate SI thresholds as predictors of outcomes in obstetric patients. Material and methods: We undertook a prospective cohort study at three South African hospitals of women with postpartum hemorrhage (n = 283) or maternal sepsis (n = 126). The “first” and “worst” SI following diagnosis were recorded. SI was compared with conventional vital signs as predictors of outcomes. The performance of SI <.9, SI .9‐1.69 and SI ≥1.7 to predict outcomes (maternal death; Critical Care Unit admission; major procedure; hysterectomy) and hemorrhage‐specific outcomes (lowest hemoglobin <70 g/l; blood transfusion ≥4 IU) were evaluated. Results: “First” SI was one of two best performing vital signs for every outcome in postpartum hemorrhage and sepsis. In hemorrhage, risk of all outcomes increased with increasing “first” SI; for blood transfusion ≥4 IU odds ratio was 4.24 (95% confidence interval 1.25‐14.36) for SI ≥1.7 vs SI .9‐1.69. In sepsis, risk of all outcomes increased with increasing “worst” SI. Sensitivity, specificity, positive and negative predictive values of “first” SI <.9 vs SI ≥.9 for maternal death were 100.0%, 55.2%, 4.6% and 100.0%, respectively, in hemorrhage and 80.0%, 50.4%, 12.3% and 96.7%, respectively, in sepsis. Conclusions: The shock index was a consistent predictor of outcomes compared with conventional vital signs in postpartum hemorrhage and sepsis. SI <.9 performed well as a rule‐out test and SI .9‐1.69 and SI ≥1.7 indicated increased risk of all outcomes in both cohorts. These thresholds may alert to the need for urgent intervention and prevent maternal deaths.