Chike Nwabuo

Dr. Chike Nwabuo

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Research Focus & Metrics

Academic Career Length

13Years (2014-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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3 February 2020 in Current Hypertension Reports
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CNChike Nwabuo
Chike Nwabuo
RVRamachandran S. Vasan
Ramachandran S. Vasan


20 September 2018 in European Heart Journal - Cardiovascular Imaging
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CNChike Nwabuo
Chike Nwabuo
HMHenrique T Moreira
Henrique T Moreira
HVHenrique D Vasconcellos
Henrique D Vasconcellos
NMNathan Mewton
Nathan Mewton
AOAnders Opdahl
Anders Opdahl
JLJoao A. C. Lima
Joao A. C. Lima
Left ventricular (LV) ejection fraction (LVEF) is an extensively utilized marker of LV function that is often interpreted without recourse to alterations in LV geometry and hypertrophy. LV global function index (LVGFI) is a novel marker that incorporates LV structure in the assessment of LV cardiac performance. We evaluated the prognostic utility of LVGFI from young adulthood into middle age for incident heart failure (HF) and cardiovascular disease (CVD) in comparison to LVEF. Included were 4107 CARDIA participants with echocardiograms in Year-5 (1990–1991). LVGFI was defined as LV stroke volume/LV global volume*100, where LV global volume was the sum of the LV mean cavity volume ((LV end-diastolic volume + LV end-systolic volume)/2) and myocardial volume (LV mass/density). Adjusted Cox proportional hazard models were utilized to predict incident HF and CVD outcomes. Mean age of participants was 29.8 ± 3.7 years, 55% female, and 48.7% black. Higher body mass index [beta coefficient (B) = −0.11 standard error (SE) = 0.02, P < 0.001], higher blood pressure (B = −0.04, SE = 0.01, P < 0.01), smoking (B = −0.82, SE = 0.22, P < 0.001), male sex (P < 0.001), and black race (P < 0.001) were associated with worse LVGFI. A total of 207 incident CVD events were observed over the course of 98 035 person-years at risk. Higher LVGFI was associated with HF, hazard ratio (HR) = 0.70, 95% confidence interval (CI) (0.54–0.91), hard CVD HR = 0.83, 95% CI (0.71–0.96), and all CVD HR = 0.83, 95% CI (0.72–0.96). For HF outcomes, Harrell’s C-statistic for LVGFI (0.80) was greater than LVEF (0.66). LVGFI is a strong, independent predictor of incident HF and CVD that provides incremental prognostic value compared with LVEF. Male sex, black race, obesity, hypertension, and smoking are associated with worse LVGFI in the early adult lifespan.

14 August 2014 in PLOS ONE
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CNChike Nwabuo
Chike Nwabuo
SDSydney Morss Dy
Sydney Morss Dy
KWKristina Weeks
Kristina Weeks
JYJ. Hunter Young
J. Hunter Young
Missed appointments are associated with an increased risk of hospitalization and mortality. Despite its widespread prevalence, little data exists regarding factors related to appointment non-adherence among hypertensive African-Americans. To investigate factors associated with appointment non-adherence among African-Americans with severe, poorly controlled hypertension. A cross-sectional survey of 185 African-Americans admitted to an urban medical center in Maryland, with severe, poorly controlled hypertension from 1999–2004. Categorical and continuous variables were compared using chi-square and t-tests. Adjusted multivariable logistic regression was used to assess correlates of appointment non-adherence. Appointment non-adherence was the primary outcome and was defined as patient-report of missing greater than 3 appointments out of 10 during their lifetime. Twenty percent of participants (n = 37) reported missing more than 30% of their appointments. Patient characteristics independently associated with a higher odds of appointment non-adherence included not finishing high school (Odds ratio [OR] = 3.23 95% confidence interval [CI] (1.33–7.69), hypertension knowledge ([OR] = 1.20 95% CI: 1.01–1.42), lack of insurance ([OR] = 6.02 95% CI: 1.83–19.88), insurance with no medication coverage ([OR] = 5.08 95% CI: 1.05–24.63), cost of discharge medications ([OR] = 1.20 95% CI: 1.01–1.42), belief that anti-hypertensive medications do not work ([OR] = 3.67 95% CI: 1.16–11.7), experience of side effects ([OR] = 3.63 95% CI: 1.24–10.62), medication non-adherence ([OR] = 11.31 95% CI: 3.87–33.10). Substance abuse was not associated with appointment non-adherence ([OR] = 1.05 95% CI: 0.43–2.57). Appointment non-adherence among African-Americans with poorly controlled hypertension was associated with many markers of inadequate access to healthcare, knowledge, attitudes and beliefs.

6 January 2016 in Diabetes Care
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Journal Article
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DADuke Appiah
Duke Appiah
PSPamela J. Schreiner
Pamela J. Schreiner
EGErica P. Gunderson
Erica P. Gunderson
SKSuma H. Konety
Suma H. Konety
DJDavid R. Jacobs
David R. Jacobs
SGSamuel Gidding
Samuel Gidding
OBJECTIVE: Gestational diabetes mellitus (GDM) predicts incident cardiovascular disease (CVD). However, mechanisms linking GDM to CVD beyond intervening incident diabetes are not well understood. We examined the relation of GDM with echocardiographic parameters of left ventricular (LV) structure and function, which are important predictors of future CVD risk. RESEARCH DESIGN AND METHODS: We studied 609 women (43% black) from the Coronary Artery Risk Development in Young Adults (CARDIA) study who delivered one or more births during follow-up and had echocardiograms in 1990–1991 (mean age 28.8 years) and 2010–2011. RESULTS: During the 20-year follow-up, 965 births were reported, with GDM developing in 64 women (10.5%). In linear regression models adjusted for sociodemographic factors, BMI, physical activity, parity, smoking, use of oral contraceptives, alcohol intake, family history of coronary heart disease, systolic blood pressure, and lipid levels, women with GDM had impaired longitudinal peak strain (−15.0 vs. −15.7%, P = 0.025), circumferential peak strain (−14.8 vs. −15.6%, P = 0.028), lateral e′ wave velocity (11.0 vs. 11.8 cm/s, P = 0.012), and septal e′ wave velocity (8.6 vs. 9.3 cm/s, P = 0.015) in 2010–2011 and a greater 20-year increase in LV mass indexed to body surface area (14.3 vs. 6.0 g/m2, P = 0.006) compared with women with non-GDM pregnancies. Further adjustment for incident type 2 diabetes after pregnancy did not attenuate these associations. CONCLUSIONS: Pregnancy complicated by GDM is independently associated with increased LV mass and impaired LV relaxation and systolic function. Implementation of postpartum cardiovascular health interventions in women with a history of GDM may offer an additional opportunity to reduce future CVD risk.

1 October 2019 in Journal of the American Heart Association
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Journal Article
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CNChike Nwabuo
Chike Nwabuo
MDMeredith Duncan
Meredith Duncan
VXVanessa Xanthakis
Vanessa Xanthakis
LPLinda Peterson
Linda Peterson
GMGary F. Mitchell
Gary F. Mitchell
RVRamachandran S. Vasan
Ramachandran S. Vasan
Background: A higher circulating plasma ceramide ratio (C16:0/C24:0) is associated with an increased risk of heart failure, even after accounting for standard risk factors including lipid markers. However, the pathobiological mechanisms that underlie this association are incompletely understood. We tested the hypothesis that plasma ceramide ratio (C16:0/C24:0) is associated with adverse cardiac remodeling in the community. Methods and Results: We evaluated 2652 Framingham Offspring Study participants (mean age, 66±9 years; 55% women) who attended their eighth examination cycle and underwent routine echocardiography and liquid chromatography–tandem mass spectrometry–based assays for circulating ceramide concentrations. We used multivariable linear regression models to relate C16:0/C24:0 (independent variable) to the following echocardiographic measures (dependent variables; separate models for each): left ventricular mass, left ventricular ejection fraction, left atrial emptying fraction, left atrial end‐systolic volume, E/e′ (a measure of left ventricular diastolic function), and left ventricular global circumferential and longitudinal strain by speckle‐tracking echocardiography. In multivariable‐adjusted analyses, higher C16:0/C24:0 per standard deviation increment was associated with lower left ventricular ejection fraction (0.991‐fold change in left ventricular ejection fraction; P =0.0004), worse global circumferential strain (β=0.34, P =0.004), higher left atrial end‐systolic volume (β=2.48, p<0.0001), and lower left atrial emptying fraction (0.99‐fold change; P <0.0001). The C16:0/C24:0 ratio was not associated with either E/e′ or global longitudinal strain, and the association with higher left ventricular mass was rendered statistically nonsignificant upon correction for multiple comparisons. Conclusions: Our cross‐sectional observations in a large community‐based sample are consistent with a potential detrimental impact of higher ceramide ratio (C16:0/24:0) on cardiac remodeling traits, which may partly explain the associations of these molecular species with clinical heart failure.