Publications by authors named "Douglas Heimburger"

Qualitative research methods are central to understanding many public health problems. However, capacity building for qualitative research is globally skewed toward high-income countries, with a significant skills deficit in low- and middle-income countries (LMICs). To address this imbalance and provide a model program, we developed the Qualitative Research Leaders (QRL) program, a pipeline program to increase qualitative research capacity in LMIC institutions and foster leadership in qualitative research.

View Article and Find Full Text PDF

The University of Zambia (UNZA) Mentor Training Program is conducted annually to strengthen the mentorship capacity of postgraduate programs for the health professions. This intensive five-session course trains faculty members in the mentorship of students. Established by senior UNZA leaders and US-based collaborators, this program was designed to address gaps in mentorship identified at the institutional level.

View Article and Find Full Text PDF

Strong cultures of mentorship and research remain underdeveloped at many African universities, threatening future knowledge generation essential for health and development on the continent. To address these challenges, a mentorship program was developed in 2018 at the University of Zambia with an aim to enhance the institutional culture of mentorship and to build institutional capacity through an innovative 'train the trainer' faculty development model. In this study, we documented perceptions of lived experiences related to mentorship culture by following trainers and trainees and their mentees over two years.

View Article and Find Full Text PDF

In this mixed-methods study, we explore themes that emerged from a survey assessing the programmatic experiences of mentors and administrators at institutions in low- and middle-income countries (LMICs) hosting trainees supported by the Fogarty International Center's Global Health Program for Fellows and Scholars. A total of 89 of 170 potential respondents representing 31 countries completed the survey (response rate, 52.4%).

View Article and Find Full Text PDF

Background: Impaired vascular compliance is common among persons with HIV (PWH) and a risk factor for cardiovascular disease (CVD), though many studies documenting this are from regions with a high prevalence of overweight and obesity. The prevalence and characteristics of impaired vascular compliance among PWH with low body mass index (BMI) is not well described, particularly in sub-Saharan Africa (SSA) where the majority of PWH live, a low BMI is more common, and the burden of CVD is rising.

Aim: To assess non-invasive vascular compliance measurements, including augmentation index (AIX), pulse wave velocity (PWV) and pulse waveforms, in underweight, normal weight, and overweight PWH on long-term antiretroviral therapy (ART) in SSA.

View Article and Find Full Text PDF

Background: Hypertension is common in people living with HIV (PLWH) on antiretroviral therapy (ART). In the general population and in experimental animal models, the incidence of hypertension is greater in males than in females, especially during the premenopausal period. However, it is not known whether there are sex differences in hypertension associated with HIV and ART, and the factors contributing to incident hypertension among PLWH have not been well characterized.

View Article and Find Full Text PDF

Objective: The goal of this study was to evaluate the prevalence of orofacial clefts (OFCs) in Tennessee over the span of 2000-2017, and evaluate the effects of race/ethnicity, sex, maternal/paternal age and socioeconomic status on the prevalence.

Methods: Records of all live births and demographics of newborns in Tennessee from 2000 to 2017 were requested from the Tennessee Department of Health to calculate the prevalence of OFCs. Data from United States Census was also obtained.

View Article and Find Full Text PDF

Background: High blood pressure (BP) is associated with high-salt consumption especially in sub-Saharan Africa. Although the pressor effect of salt is viewed as a chronic effect, some studies suggest that a salty meal may increase BP immediately in some individuals, and that this effect may cause endothelial dysfunction. Therefore, the aim of our research was to study the immediate pressor response to oral salt (IPROS) and its determinants, with the expectation that a simple methodology may be devised to diagnose it in the clinic or in low-resource environments.

View Article and Find Full Text PDF

Background: Peripartum cardiomyopathy (PPCM) disproportionately affects women of African descent, however knowledge about this disease in African countries is limited.

Objectives: To describe the phenotype of women with PPCM seen at a referral hospital in Zambia and examine outcomes at 6 months.

Methods: A prospective observational study describing characteristics and 6-month outcomes was performed at the University Teaching Hospital Echocardiography Lab in Lusaka, Zambia.

View Article and Find Full Text PDF

Introduction: Little is known about specific bacterial characteristics of () infection influencing gastric carcinogenesis in Zambia. The aim of this study was to evaluate the associations between pre-selected antibodies with gastric cancer, premalignant lesions and active gastritis.

Methods: This was cross-sectional study with multiple comparisons of patients with gastric cancer (GC), gastric premalignant (GP) lesions and active or chronic gastritis.

View Article and Find Full Text PDF

Background: Cardiovascular disease (CVD) prevalence is rising among persons with HIV (PLWH) in sub-Saharan Africa. Oxidative stress and endothelial activation, resulting in reduced vascular compliance, are contributors to CVD risk. However, there is a paucity of vascular health data in this population.

View Article and Find Full Text PDF

Training the next generation of global health researchers is vital for sustainable research partnerships and global health equity. The Fogarty International Center (National Institutes of Health) supports postdoctoral fellows and professional/graduate students in long-term, hands-on mentored research in low- and middle-income countries (LMICs). We surveyed 627 alumni (58% from the United States, 42% from LMICs) from three sequential Fogarty-sponsored global health research training programs (response rate: N = 257, 41%).

View Article and Find Full Text PDF

Objectives: Stunting, the most common form of childhood undernutrition, is associated with environmental enteropathy (EE). Enteric infections are believed to play a role in the pathophysiology of EE and stunting though the exact mechanism remains undetermined. The FUT2 (secretor) and FUT3 (Lewis) genes have been shown to be associated with some symptomatic enteric infections in both children and adults.

View Article and Find Full Text PDF

Background: Schistosoma mansoni is hyperendemic in many rural areas of Zambia where up to 77% of people are positive for infection via serologic evaluation. Zambia also has a high prevalence of HIV infection. Individually, S.

View Article and Find Full Text PDF

Persons living with HIV (PLWH) receiving tenofovir disoproxil fumarate (TDF)-based antiretroviral therapy (ART) risk suffering TDF-associated nephrotoxicity (TDFAN). TDFAN can result in short- and long-term morbidity, including permanent loss of kidney function, chronic kidney disease (CKD), and end-stage kidney disease (ESKD) requiring dialysis. Currently, there is no model to predict this risk or discern which patients to initiate TDF-based therapy.

View Article and Find Full Text PDF

Purpose: Cancer occurrence is increasing in Africa, although research has lagged. The objective of this review was to analyze cancer research outputs from Africa, with a particular focus on Zambia.

Methods: We searched PubMed for published cancer-related articles from African countries.

View Article and Find Full Text PDF

Metabolic syndrome (MetS) is a constellation of factors including hypertension, abdominal obesity, dyslipidemia, and insulin resistance that separately and together significantly increase risk for cardiovascular disease (CVD) and diabetes. In sub-Saharan Africa, with a substantial burden of human immunodeficiency virus (HIV) and increasing prevalence of CVD and diabetes, there is a paucity of epidemiological data on demographic, laboratory, and clinical characteristics associated with MetS among people with HIV (people with human [PWH]). Therefore, this study aimed to determine the burden and factors influencing MetS in antiretroviral therapy (ART)-experienced individuals in Zambia.

View Article and Find Full Text PDF

Objective: To identify risk factors for delirium among hospitalized patients in Zambia.

Methods: We conducted a prospective cohort study at the University Teaching Hospital in Lusaka, Zambia, from October 2017 to April 2018. We report associations of exposures including sociodemographic and clinical factors with delirium over the first three days of hospital admission, assessed using a modified Brief Confusion Assessment Method (bCAM).

View Article and Find Full Text PDF
Article Synopsis
  • Lean individuals living with HIV (PLWH) showed greater immune activation, as indicated by higher percentages of activated CD4+ and CD8+ T cells compared to HIV-negative controls.
  • The study found a negative correlation between certain types of immune activation (specifically senescent CD4+ and activated CD8+ T cells) and arterial stiffness, measured through different pulse wave velocity metrics.
  • Despite lower arterial stiffness measures in PLWH, they exhibited a higher carotid-femoral augmentation index, suggesting a complex relationship between immune activation and vascular health that requires further investigation.
View Article and Find Full Text PDF

Purpose Of Review: Sub-Saharan Africa (SSA) is disproportionately burdened by the twin epidemics of food insecurity and HIV infection, and protein-calorie undernutrition is common among persons with HIV (PWH) initiating antiretroviral therapy (ART) in the region. In this review, we discuss the intersection of HIV infection and undernutrition, health outcomes among undernourished PWH starting ART, and the demonstrated and potential benefits of therapeutic interventions such as micro/macronutrient supplementation and pharmacological agents.

Recent Findings: A low body mass index (BMI), used as a general indicator of poor nutrition in most studies, is associated with impaired immune recovery and increased mortality in the early ART period.

View Article and Find Full Text PDF

Background: With the introduction of effective antiretroviral therapy (ART), people living with HIV (PLWH) are surviving longer and are at risk for developing metabolic abnormalities that contribute to cardiovascular disease (CVD). In Sub-Saharan Africa (SSA), there is a paucity of epidemiological data on lipid profiles among young adults receiving ART. This study aimed to estimate the prevalence of low high-density lipoprotein cholesterol (HDL-c), a cardioprotective lipid class, and whether it differed by age among adults on ART in Livingstone, Zambia.

View Article and Find Full Text PDF

Objective: To study the epidemiology and outcomes of delirium among hospitalized patients in Zambia.

Methods: We conducted a prospective cohort study at the University Teaching Hospital in Lusaka, Zambia, from October 2017 to April 2018. The primary exposure was delirium duration over the initial 3 days of hospitalization, assessed daily using the Brief Confusion Assessment Method.

View Article and Find Full Text PDF

Background: Endothelial function is dependent on the balance between vasoconstrictive and vasodilatory substances. The endothelium ability to produce nitric oxide is one of the most crucial mechanisms in regulating vascular tone. An increase in inducible nitric oxide synthase contributes to endothelial dysfunction in overweight persons, while in underweight persons, oxidative stress contributes to the conversion of nitric oxide to peroxynitrite (measured as nitrotyrosine ).

View Article and Find Full Text PDF

Background: High dietary salt and a lack of reduced blood pressure (BP) at night (non-dipping) are risk factors for the development of hypertension which may result in end-organ damage and death. The effect of high dietary salt on BP in black people of sub-Saharan Africa living with HIV is not well established. The goal of this study was to explore the associations between salt sensitivity and nocturnal blood pressure dipping according to HIV and hypertension status in a cohort of adult Zambian population.

View Article and Find Full Text PDF

Introduction: Hemoglobin A1c (HbA1c) is recommended for diagnosing and monitoring diabetes. However, in people with sickle cell disease (SCD), sickle cell trait (SCT), α-thalassemia or glucose-6-phosphate dehydrogenase (G6PD) deficiency, HbA1c may underestimate the prevalence of diabetes. There are no data on the extent of this problem in sub-Saharan Africa despite having high prevalence of these red blood cell disorders.

View Article and Find Full Text PDF