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Jalavu TP, Sigwadhi LN, Kotze MJ, Yalew A, Ngah V, Tamuzi JL, Chapanduka ZC, Allwood BW, Koegelenberg CF, Irusen EM, Lalla U, Matsha TE, Erasmus RT, Zumla A, Zemlin AE, Nyasulu PS. An investigation of the correlation of vitamin D status and management outcomes in patients with severe COVID-19 at a South African tertiary hospital. IJID REGIONS 2023; 8:S2772-7076(23)00063-2. [PMID: 37363198 PMCID: PMC10234344 DOI: 10.1016/j.ijregi.2023.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 05/24/2023] [Accepted: 05/26/2023] [Indexed: 06/28/2023]
Abstract
Background Severe COVID-19 has a poor prognosis, and biomarkers may predict disease severity. This study aimed to assess the effect of baseline Vitamin D (VitD) inadequacy on outcome of patients with severe COVID-19 admitted to intensive care unit (ICU) in a tertiary hospital in South Africa. Methods Patients with confirmed SARS-CoV-2 were recruited during wave II of the pandemic in Cape Town. Eighty-six patients were included in the study. They were categorized into three groups "VitD deficient, VitD insufficient and VitD sufficient". We combined the VitD deficient with insufficient group to form "VitD inadequate'' group. Cox regression analysis was done to assess the association between VitD status and mortality. Factors with p< 0.05 in adjusted multivariable cox regression were considered statistically significant. Results The proportion of VitD inadequacy was 64% (55/86), with significantly higher proportion of hypertension (66%; p 0.012). Kaplan Meir curve showed no significant difference in the probability of survival among the COVID-19 patients admitted in the ICU with or without VitD inadequacy. However, patients with elevated serum creatinine were significantly more at risk of dying (Adjusted Hazard Ratio 1.008 (1.002 - 1.030, p<0.017). Conclusion Our study found a high prevalence of VitD inadequacy (combined deficiency and insufficiency) in COVID-19 patients admitted to the ICU. This may indicate a possible risk of severe disease. Whilst there was no statistically significant relationship between VitD status and mortality in this cohort, baseline VitD may be an important prognostic biomarker in COVID-19 patients admitted to the ICU, particularly in those with comorbidities that predispose to VitD deficiency.
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Affiliation(s)
- Thumeka P. Jalavu
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University and NHLS Tygerberg Hospital, Cape Town, South Africa
| | - Lovemore N. Sigwadhi
- Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Maritha J. Kotze
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University and NHLS Tygerberg Hospital, Cape Town, South Africa
| | - Anteneh Yalew
- Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Vera Ngah
- Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Jacques L. Tamuzi
- Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Zivanai C. Chapanduka
- Division of Haematological Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University and NHLS Tygerberg Hospital, Cape Town, South Africa
| | - Brian W. Allwood
- Division of Pulmonology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - Coenraad F. Koegelenberg
- Division of Pulmonology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - Elvis M. Irusen
- Division of Pulmonology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - Usha Lalla
- Division of Pulmonology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa
| | - Tandi E. Matsha
- Sefako Makgatho Health Sciences University, Ga-Rankuwa, Pretoria, South Africa
- SAMRC/CPUT/Cardiometabolic Health Research Unit, Cape Peninsula University of Technology, Cape Town, South Africa
| | - Rajiv T. Erasmus
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University and NHLS Tygerberg Hospital, Cape Town, South Africa
| | - Alimmudin Zumla
- Center for Clinical Microbiology, Division of Infection and Immunity, University College London, NIHR Biomedical Research Centre, UCL Hospitals NHS Foundation Trust, London, United Kingdom
| | - Annalise E. Zemlin
- Division of Chemical Pathology, Department of Pathology, Faculty of Medicine and Health Sciences, Stellenbosch University and NHLS Tygerberg Hospital, Cape Town, South Africa
| | - Peter S. Nyasulu
- Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
- Division of Epidemiology and Biostatistics, School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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Navise NH, Mokwatsi GG, Gafane-Matemane LF, Fabian J, Lammertyn L. Kidney dysfunction: prevalence and associated risk factors in a community-based study from the North West Province of South Africa. BMC Nephrol 2023; 24:23. [PMID: 36717778 PMCID: PMC9887915 DOI: 10.1186/s12882-023-03068-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 12/21/2022] [Accepted: 01/20/2023] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND Globally, the World Health Organization ranks chronic kidney disease (CKD) as one of the top 10 causes of mortality. In South Africa, where noncommunicable diseases have become leading causes of mortality, the true population prevalence of CKD is unknown and associated risk factors remain understudied. This study aimed to describe the prevalence of kidney dysfunction and associated risk factors in a community from the North West province of South Africa. METHODS This cross-sectional study included 1999 participants older than 30 years. Kidney dysfunction was defined as (i) estimated glomerular filtration rate (eGFR) < 90 ml/min/1.73m2, or (ii) urine albuminuria-to-creatinine ratio (uACR) ≥ 3.0 mg/mmol, or a combination (i and ii). Risk factors included age, sex, urban/rural locality, body mass index (BMI), blood pressure (BP), lipid profile, haemoglobin A1c (HbA1C), C-reactive protein (CRP), gamma-glutamyl transferase (GGT), tobacco use, and HIV status. RESULTS Mean age of participants was 48 (42;56) years, and 655/1999 (33%) had eGFR < 90 ml/min/1.73m2 and/or uACR ≥ 3.0 mg/mmol. Compared to those with normal kidney function, participants with eGFR < 90 ml/min/1.73m2 and/or uACR ≥ 3.0 mg/mmol were older, female, had higher measures of adiposity, systolic, diastolic, and mean arterial blood pressure, serum lipids and C-reactive protein (CRP) (all p ≤ 0.024). In multiple regression analyses eGFR was associated with systolic BP (β = 0.11) and HIV infection (β = -0.09), and albuminuria was associated with elevated CRP (β = 0.12) and HIV infection (β = 0.11) (all p < 0.026). In both groups (individuals with and without kidney dysfunction respectively), eGFR was associated with age (β = -0.29, β = -0.49), male sex (β = 0.35, β = 0.28), BMI (β = -0.12, β = -0.09), low-density/high-density lipoprotein cholesterol ratio (β = -0.17, β = -0.09) and CRP (β = 0.10, β = 0.09) (all p < 0.005); and uACR was associated with female sex (β = 0.10, β = -0.14), urban locality (β = -0.11, β = -0.08), BMI (β = -0.11, β-0.11), and systolic BP (β = 0.27, β = 0.14) (all p < 0.017). CONCLUSION In this study from the North West province, South Africa, eGFR < 90 ml/min/1.73m2 and/or uACR ≥ 3.0 mg/mmol was prevalent and associated with modifiable risk factors. The findings may inform screening strategies for kidney disease prevention, focusing on women, obesity, blood pressure control, dyslipidaemia, identifying and treating inflammation, and HIV diagnosis and treatment.
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Affiliation(s)
- Nonkululeko Hellen Navise
- grid.25881.360000 0000 9769 2525Hypertension in Africa Research Team (HART), North-West University, Private Bag x6001, Potchefstroom, South Africa
| | - Gontse Gratitude Mokwatsi
- grid.25881.360000 0000 9769 2525Hypertension in Africa Research Team (HART), North-West University, Private Bag x6001, Potchefstroom, South Africa ,grid.25881.360000 0000 9769 2525MRC Unit for Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa
| | - Lebo Francina Gafane-Matemane
- grid.25881.360000 0000 9769 2525Hypertension in Africa Research Team (HART), North-West University, Private Bag x6001, Potchefstroom, South Africa ,grid.25881.360000 0000 9769 2525MRC Unit for Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa
| | - June Fabian
- grid.11951.3d0000 0004 1937 1135Wits Donald Gordon Medical Centre, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Leandi Lammertyn
- grid.25881.360000 0000 9769 2525Hypertension in Africa Research Team (HART), North-West University, Private Bag x6001, Potchefstroom, South Africa ,grid.25881.360000 0000 9769 2525MRC Unit for Hypertension and Cardiovascular Disease, North-West University, Potchefstroom, South Africa
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García GG, Iyengar A, Kaze F, Kierans C, Padilla-Altamira C, Luyckx VA. Sex and gender differences in chronic kidney disease and access to care around the globe. Semin Nephrol 2022; 42:101-113. [PMID: 35718358 DOI: 10.1016/j.semnephrol.2022.04.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The difference between sex, the biological construct, and gender, the social construct, may be most evident in settings of vulnerability. Globally, chronic kidney disease is more prevalent among women, but the prevalence of end-stage kidney failure, and especially receipt of kidney replacement therapy, is higher in men. These differences likely reflect a combination of physiological and social/structural risk factors that independently modulate kidney disease and/or its progression. The distribution of the most common risk factors such as hypertension and obesity differ between men and women and may impact disease risk differentially. Social and structural gender-related inequities remain stark across the globe. More women live in poverty, receive less education, and are more dependent on others for health care decision making, but men may have a higher risk of injury, occupational exposures, and less access to screening, prevention, and primary care. In this article, we explore how social determinants of health affect kidney disease risk and access to care differentially across genders, and differently across the globe. We also describe specific challenges experienced by boys and girls with kidney disease, how culture and geography may impact kidney care in places where resources are particularly limited such as sub-Saharan Africa, and give examples of social and structural circumstances that place young men and women at high risk of kidney disease in Mexico and Central America, illustrated by case vignettes. The coronavirus disease-2019 pandemic has raised awareness of pervasive gender-based inequities within all societies. This applies to kidney disease and is not new. The nephrology community must add its voice to the calls for action, for a more just society overall, and for the recognition of the roles of sex and gender as modulators of kidney disease risk and access to care.
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Affiliation(s)
- Guillermo García García
- Nephrology Service, Hospital Civil de Guadalajara "Fray Antonio Alcalde," University of Guadalajara Health Sciences Center (Centro Universitario de Ciencias de la Salud), Guadalajara, Jalisco, Mexico
| | - Arpana Iyengar
- Department of Paediatric Nephrology, St. John's National Academy of Health Sciences, Bangalore, India
| | - François Kaze
- Faculty of Medicine and Biomedical Sciences, Yaoundé University Teaching Hospital, Yaoundé, Cameroon
| | - Ciara Kierans
- Department of Public Health, Policy and Systems, University of Liverpool, Liverpool, United Kingdom
| | - Cesar Padilla-Altamira
- Department of Public Health, Policy and Systems, University of Liverpool, Liverpool, United Kingdom; Center for Research and Higher Studies in Social Anthropology, Guadalajara, Jalisco, Mexico
| | - Valerie A Luyckx
- Department of Nephrology, University Children's Hospital University of Zurich, Zurich, Switzerland,; Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Department of Paediatrics and Child Health, University of Cape Town, Cape Town, South Africa.
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George C, Stoker S, Okpechi I, Woodward M, Kengne A. The Chronic Kidney Disease in Africa (CKD-Africa) collaboration: lessons from a new pan-African network. BMJ Glob Health 2021; 6:e006454. [PMID: 34348933 PMCID: PMC8340290 DOI: 10.1136/bmjgh-2021-006454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 07/20/2021] [Indexed: 11/03/2022] Open
Abstract
Chronic kidney disease (CKD) is a global public health problem, seemingly affecting individuals from low-income and-middle-income countries (LMICs) disproportionately, especially in sub-Saharan Africa. Despite the growing evidence pointing to an increasing prevalence of CKD across Africa, there has not been an Africa-wide concerted effort to provide reliable estimates that could adequately inform health services planning and policy development to address the consequences of CKD. Therefore, we established the CKD in Africa (CKD-Africa) Collaboration. To date, the network has curated data from 39 studies conducted in 12 African countries, totalling 35 747 participants, of which most are from sub-Saharan Africa. We are, however, continuously seeking further collaborations with other groups who have suitable data to grow the network. Although many successful research consortia exist, few papers have been published (with none from Africa) detailing the challenges faced and lessons learnt in setting up and managing a research consortium. Drawing on our experience, we describe the steps taken and the key factors required to establish a functional collaborative consortium among researchers in Africa. In addition, we present the challenges we encountered in building our network, how we managed those challenges and the benefit of such a collaboration for Africa. Although the CKD-Africa Collaboration is focused primarily on CKD research, many of the lessons learnt can be applied more widely in public health research in LMICs.
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Affiliation(s)
- Cindy George
- Non-Communicable Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa
| | - Suzaan Stoker
- Non-Communicable Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa
| | - Ikechi Okpechi
- Division of Nephrology and Hypertension, University of Cape Town, Cape Town, South Africa
- Division of Nephrology and Immunology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Kidney and Hypertension Research Unit, University of Cape Town, Cape Town, South Africa
| | - Mark Woodward
- The George Institute for Global Health, Department of Epidemiology and Biostatistics, Imperial College, London, UK
- The George Institute for Global Health, University of New South Wales, Sydney, New South Wales, Australia
| | - Andre Kengne
- Non-Communicable Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa
- Department of Medicine, University of Cape Town, Cape Town, South Africa
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