Browsing by Author "Longenecker, Chris T."

Now showing 1 - 5 of 5
  • Thumbnail Image
    Item
    Coronary artery calcium, HIV and inflammation in Uganda compared with the USA
    (Open Heart, 2019) Alencherry, Ben; Erem, Geoffrey; Mirembe, Grace; Ssinabulya, Isaac; Yun, Chun-Ho; Hung, Chung-Lieh; Siedner, Mark J.; Bittencourt, Marcio; Kityo, Cissy; McComsey, Grace A.; Longenecker, Chris T.
    To compare the prevalence of detectable coronary artery calcium (CAC) among higher risk, older people living with HIV (PLWH) and uninfected persons in Uganda versus the USA, and second to explore associations of CAC with HIV-specific variables and biomarkers of inflammation. This cross-sectional study of 430 total subjects compared 100 PLWH on antiretroviral therapy and 100 age-matched and sex-matched HIV-uninfected controls in Uganda with 167 PLWH on antiretroviral therapy and 63 uninfected controls in the USA. Multivariable logistic regression was used to examine associations with detectable CAC (CAC >0). Compared with US subjects, Ugandans were older (mean age 56 vs 52 years) and were more likely to have diabetes (36% vs 3%) and hypertension (85% vs 36%), but were less likely to be male (38% vs 74%) or smokers (4% vs 56%). After adjustment for HIV serostatus, age, sex and traditional risk factors, Ugandans had substantially lower odds of CAC >0 (adjusted OR 0.07 (95% CI 0.03 to 0.17), p<0.001). HIV was not associated with CAC >0 in either country (p>0.1). Among all PLWH, nadir CD4 count was associated with the presence of CAC, and among Ugandans soluble intercellular adhesion molecule (p=0.044), soluble CD163 (p=0.004) and oxidised low-density lipoprotein (p=0.043) were all associated with the presence of CAC. Ugandans had a dramatically lower prevalence of any coronary calcification compared with US subjects. The role of HIV infection and inflammation as risk factors for subclinical coronary disease in sub-Saharan Africa merits further investigation.
  • Thumbnail Image
    Item
    Global Medical Education Partnerships to Expand Specialty Expertise: A Case Report on Building Neurology Clinical and Research Capacity
    (Human resources for health, 2014) Kaddumukasa, Mark; Katabira, Elly; Salata, Robert A.; Costa, Marco A.; Ddumba, Edward; Furlan, Anthony; Mwesige, Angelina Kakooza; Kamya, Moses R.; Kayima, James; Longenecker, Chris T.; Kizza, Harriet Mayanja; Mondo, Charles; Moore, Shirley; Pundik, Svetlana; Sewankambo, Nelson; Simon, Daniel I.; Smyth, Kathleen A.; Sajatovic, Martha
    Neurological disorders are a common cause of morbidity and mortality in sub-Saharan African, but resources for their management are scarce. Collaborations between training institutions in developed and resource-limited countries can be a successful model for supporting specialty medical education and increasing clinical and research capacity.This report describes a US National Institutes of Health (NIH) funded Medical Education Partnership Initiative (MEPI) to enhance expertise in neurology, developed between Makerere University College of Health Sciences in Kampala, Uganda, and Case Western Reserve University School of Medicine in Cleveland, OH, USA.This collaborative model is based on a successful medical education and research model that has been developed over the past two decades. The Ugandan and US teams have accumulated knowledge and 'lessons learned' that facilitate specialty expertise in neurological conditions, which are widespread and associated with substantial disability in resource-limited countries. Strengths of the model include a focus on community health care settings and a strong research component. Key elements include strong local leadership; use of remote technology, templates to standardize performance; shared exchanges; mechanisms to optimize sustainability and of dissemination activities that expand impact of the original initiative. Efficient collaborations are further enhanced by external and institutional support, and can be sequentially refined.Models such as the Makerere University College of Health Sciences - Case Western Reserve University partnership may help other groups initiate collaborative education programmes and establish successful partnerships that may provide the opportunity to expand to other chronic diseases. A benefit of collaboration is that learning is two-directional, and interaction with other international medical education collaborators is likely to be of benefit to the larger global health community.
  • Thumbnail Image
    Item
    HIV and Pericardial Fat are Associated with Abnormal Cardiac Structure and Function among Ugandans
    (Heart, 2020) Buggey, Jonathan; Yun, Chun-Ho; Hung, Chung-Lieh; Kityo, Cissy; Mirembe, Grace; Erem, Geoffrey; Ssinabulya, Isaac; McComseya, Grace A.; Longenecker, Chris T.
    To examine the relationship between pericardial fat (PCF) and cardiac structure and function among HIV-infected patients in the sub-Saharan African country of Uganda. People living with HIV (PLHIV) have altered fat distribution and an elevated risk for heart failure. Whether altered quantity and radiodensity of fat surrounding the heart relates to cardiac dysfunction in this population is unknown. One hundred HIV-positive Ugandans on antiretroviral therapy were compared with 100 age and sex-matched HIV-negative Ugandans; all were >45 years old with >1 cardiovascular disease risk factor. Subjects underwent ECG-gated non-contrast cardiac CT and transthoracic echocardiography with speckle tracking strain imaging. Multivariable linear and logistic regression models were used to explore the association of PCF with echocardiographic outcomes. Median age was 55% and 62% were female. Compared with uninfected controls, PLHIV had lower body mass index (27 vs 30, p=0.02) and less diabetes (26% vs 45%, p=0.005). Median left ventricular (LV) ejection fraction was 67%. In models adjusted for traditional risk factors, HIV was associated with 10.3 g/m2 higher LV mass index (LVMI) (95% CI 3.22 to 17.4; p=0.005), 0.87% worse LV global longitudinal strain (GLS) (95% CI −1.66 to −0.07; p=0.03) and higher odds of diastolic dysfunction (OR 1.96; 95% CI 0.95 to 4.06; p=0.07). In adjusted models, PCF volume was significantly associated with increased LVMI and worse LV GLS, while PCF radiodensity was associated with worse LV GLS (all p<0.05). In Uganda, HIV infection, PCF volume and density are associated with abnormal cardiac structure and function.
  • Thumbnail Image
    Item
    Incidence of acute rheumatic fever in northern and western Uganda: a prospective, population-based study
    (The Lancet Global Health, 2021) Okello, Emmy; Ndagire, Emma; Muhamed, Babu; Sarnacki, Rachel; Nakitto, M.G.; Kansiime, Rosemary; Longenecker, Chris T.; Lwabi, Peter; Agaba, Collins; Omara, Isaac Otim; Oyella, Linda Mary; Rwebembera, Joselyn; Watkins, David; Carapetis, Jonathan R.
    Acute rheumatic fever is infrequently diagnosed in sub-Saharan African countries despite the high prevalence of rheumatic heart disease. We aimed to determine the incidence of acute rheumatic fever in northern and western Uganda. For our prospective epidemiological study, we established acute rheumatic fever clinics at two regional hospitals in the north (Lira district) and west (Mbarara district) of Uganda and instituted a comprehensive acute rheumatic fever health messaging campaign. Communities and health-care workers were encouraged to refer children aged 3–17 years, with suspected acute rheumatic fever, for a definitive diagnosis using the Jones Criteria. Children were referred if they presented with any of the following: (1) history of fever within the past 48 h in combination with any joint complaint, (2) suspicion of acute rheumatic carditis, or (3) suspicion of chorea. We excluded children with a confirmed alternative diagnosis. We estimated incidence rates among children aged 5–14 years and characterised clinical features of definite and possible acute rheumatic fever cases. Data were collected between Jan 17, 2018, and Dec 30, 2018, in Lira district and between June 5, 2019, and Feb 28, 2020, in Mbarara district. Of 1075 children referred for evaluation, 410 (38%) met the inclusion criteria; of these, 90 (22%) had definite acute rheumatic fever, 82 (20·0%) had possible acute rheumatic fever, and 24 (6%) had rheumatic heart disease without evidence of acute rheumatic fever. Additionally, 108 (26%) children had confirmed alternative diagnoses and 106 (26%) had an unknown alternative diagnosis. We estimated the incidence of definite acute rheumatic fever among children aged 5–14 years as 25 cases (95% CI 13·7–30·3) per 100 000 person-years in Lira district (north) and 13 cases (7·1–21·0) per 100 000 person-years in Mbarara district (west).
  • Thumbnail Image
    Item
    Prevalence of latent rheumatic heart disease among HIV-infected children in Kampala, Uganda
    (Journal of acquired immune deficiency syndromes, 2016) Gleason, Brigette; Mirembe, Grace; Namuyonga, Judith; Okello, Emmy; Lwabi, Peter; Lubega, Irene; Lubega, Sulaiman; Musiime, Victor; Kityo, Cissy; Salata, Robert A.; Longenecker, Chris T.
    Rheumatic heart disease (RHD) remains highly prevalent in resource-constrained settings around the world, including countries with high rates of HIV/AIDS. Although both are immune-mediated diseases, it is unknown whether HIV modifies the risk or progression of RHD. We performed screening echocardiography to determine the prevalence of latent rheumatic heart disease in 488 HIV-infected children aged 5-18 in Kampala, Uganda. The overall prevalence of borderline/definite RHD was 0.82% (95% CI 0.26% to 2.23%) which is lower than the published prevalence rates of 1.5-4% among Ugandan children. There may be protective factors that decrease the risk of RHD in HIV-infected children.