Faculty Bibliography

BACKGROUND: Lack of adherence to recommended treatment for obstructive sleep apnea remains an ongoing public health challenge. Despite evidence that continuous positive airway pressure (CPAP) is effective and improves overall quality of life, compliance with the use of CPAP in certain racial/ethnic groups, especially blacks, is suboptimal. Evidence indicates that the incidence and prevalence of obstructive sleep apnea are higher among blacks, relative to whites, and blacks are less likely to adhere to recommended treatment compared with other racial/ethnic groups. METHODS: Using a two-arm randomized controlled design, this study will evaluate the effectiveness of a culturally and linguistically tailored telephone-delivered intervention to promote adherence to physician-recommended sleep apnea assessment and treatment among blacks with metabolic syndrome, versus an attention-control arm. The intervention is designed to foster adherence to recommended sleep apnea care using the stages-of-change model. The intervention will be delivered entirely over the telephone. Participants in the intervention arm will receive 10 phone calls to address challenges and barriers to recommended care. Outcomes will be assessed at baseline, and at 6- and 12-months post-randomization. DISCUSSION: This tailored behavioral intervention will improve adherence to sleep apnea assessment and treatment among blacks with metabolic syndrome. We expect to demonstrate that this intervention modality is feasible in terms of time and cost and can be replicated in populations with similar racial/ethnic backgrounds.Trial registration: The study is registered at clinicaltrials.gov NCT01946659 (February 2013).

BACKGROUND: Hypertension is a major public health problem in many sub-Saharan African countries including Ghana, but data on urban poor communities are limited. The aim of this study was therefore to assess the prevalence, awareness, management and control of hypertension among a young adult population in their reproductive ages living in urban poor communities in Accra. METHODS: Cross-sectional, population-based survey of 714 young adults in their reproductive ages (women aged 15-49 years, men aged 15-59 years) living in three urban poor suburbs of Accra, Ghana. RESULTS: The overall prevalence of hypertension in all three communities was 28.3% (women 25.6% and men 31.0%). Among respondents who had hypertension, 7.4% were aware of their condition; 4% were on antihypertensive medication while only 3.5% of hypertensive individuals had adequate blood pressure (BP) control (BP <140/90 mmHg). The level of awareness and treatment was lower in men than in women (3.1 and 1.3% for men and 11.9 and 6.5% for women, respectively). Among individuals with hypertension, the rate of control was higher among women than among men (5.0 and 2.1%, respectively). CONCLUSION: Although about a quarter of the young adult population in these low-income communities of Accra have hypertension, the levels of awareness, treatment and control are abysmally low. We recommend community-specific primary and secondary prevention interventions that draw on existing resources, specifically implementing cardiovascular disease (CVD) interventions in faith-based organizations and task-shifting CVD care through the national Community-based Health Planning and Services (CHPS) programme.

BACKGROUND: Data are limited on the implementation of evidence-based multilevel interventions targeted at blood pressure (BP) control in hypertensive blacks who receive care in low-resource primary care practices. METHODS AND RESULTS: Counseling African Americans to Control Hypertension is a cluster-randomized clinical trial in which 30 community health centers were randomly assigned to the intervention condition (IC) or usual care (UC). Patients at the IC sites received patient education, home BP monitoring, and monthly lifestyle counseling, whereas physicians attended monthly hypertension case rounds and received feedback on their patients' home BP readings and chart audits. Patients and physicians at the UC sites received printed patient education material and hypertension treatment guidelines, respectively. The primary outcome was BP control, and secondary outcomes were mean changes in systolic and diastolic BPs at 12 months, assessed with an automated BP device. A total of 1059 patients (mean age, 56 years; 28% men, 59% obese, and 36% with diabetes mellitus) were enrolled. The BP control rate was similar in both groups (IC=49.3% versus UC=44.5%; odds ratio, 1.21 [95% confidence interval, 0.90-1.63]; P=0.21). In prespecified subgroup analyses, the intervention was associated with greater BP control in patients without diabetes mellitus (IC=54.0% versus UC=44.7%; odds ratio, 1.45 [confidence interval, 1.02-2.06]); and small-sized community health centers (IC=51.1% versus UC=39.6%; odds ratio, 1.45 [confidence interval, 1.04-2.45]). CONCLUSIONS: A practice-based, multicomponent intervention was no better than UC in improving BP control among hypertensive blacks. Future research on the implementation of behavioral modification strategies for hypertension control in low-resource settings should focus on the development of more efficient and tailored interventions in this high-risk population. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT00233220.

OBJECTIVE: To compare performance of single-injection blood pool agent (gadofosveset trisodium, BPA) against dual-injection extracellular contrast (gadopentetate dimeglumine, ECA) for MRA/MRV in assessment of suspected vascular TOS. MATERIALS AND METHODS: Thirty-one patients referred for vascular TOS evaluation were assessed with BPA (n=18) or ECA (n=13) MRA/MRV in arm abduction and adduction. Images were retrospectively assessed for: image quality (1=non-diagnostic, 5=excellent), vessel contrast (1=same signal as muscle, 4=much brighter than muscle) and vascular pathology by two independent readers, with a separate experienced reader providing reference assessment of vascular pathology. RESULTS: Median image quality was diagnostic or better (score >/=3) for ECA and BPA at all time points, with BPA image quality superior at abduction late (BPA 4.5, ECA 4, p=0.042) and ECA image quality superior at adduction-early (BPA 4.5; ECA 4.0, p=0.018). High qualitative vessel contrast (mean score >/=3) was observed at all time points with both BPA and ECA, with superior BPA vessel contrast at abduction-late (BPA 3.97+/-0.12; ECA 3.73+/-0.26, p=0.007) and ECA at adduction-early (BPA 3.42+/-0.52; ECA 3.96+/-0.14, p<0.001). Readers readily identified arterial and venous pathology with BPA, similar to ECA examinations. CONCLUSION: Single-injection BPA MRA/MRV for TOS evaluation demonstrated diagnostic image quality and high vessel contrast, similar to dual-injection ECA imaging, enabling identification of fixed and functional arterial and venous pathology.

OBJECTIVE: To examine the relationship between perceived discrimination and medication adherence among black people with hypertension and the role of stress and depressive symptoms in this relationship. Perceived racial discrimination has been associated with poor health outcomes in blacks; its relationship to medication adherence among hypertensive patients remains untested. METHODS: We measured perceived racial discrimination at baseline, stress and depressive symptoms at 6 months, and medication adherence at 12 months among patients enrolled in a 30-site cluster-randomized controlled trial testing a patient and physician-targeted intervention to improve blood pressure. A mediational method with bootstrapping (stratified by site) confidence intervals was used to estimate the indirect association between perceived discrimination and medication adherence through stress and depression. RESULTS: Of 1056 patients from 30 sites enrolled in the trial, 463 had complete data on all four measures at 6 and 12 months and were included in the analyses. Adjusting for clustering, perceived discrimination was associated with poor medication adherence (B = 0.138, p = .011) at 12 months, and with stress (B = 2.24, p = .001) and depression (B = 1.47, p = .001) at 6 months. When stress and depression were included in the model, there was a 65% reduction in the total association of perceived discrimination with medication adherence, and the relationship was no longer significant (B = 0.049, p = .35). CONCLUSIONS: Perceived discrimination is associated with poor medication adherence among hypertensive blacks, and stress and depressive symptoms may account for this relationship. TRIAL REGISTRATION: clinicaltrials.gov Identifier: NCT00233220.

BACKGROUND: Epidemiologic studies show a curvilinear relationship between inadequate sleep (< 7 or > 8 hours) and obesity (Body Mass Index > 30 kg/m2), which have enormous public health impact. METHODS: Using data from the National Health Interview Survey, an ongoing nationally representative cross-sectional study of non-institutionalized US adults (>/=18 years) (1977 through 2009), we examined the hypothesis that inadequate sleep is independently related to overweight/obesity, with adjustment for socio-demographic, health risk, and medical factors. Self- reported data on health risks, physician-diagnosed medical conditions, sleep duration, and body weight and height were used. RESULTS: Prevalence of overweight and obesity increased from 31.2% to 36.9% and 10.2% to 27.7%, respectively. Whereas prevalence of very short sleep (<5 hours) and short sleep (5-6 hours) has increased from 1.7% to 2.4% and from 19.7% to 26.7%, it decreased from 11.6% to 7.8% for long sleep. According to multivariate-adjusted multinomial regression analyses, odds of overweight and obesity associated with very short sleep and short sleep increased significantly from 1977 to 2009. Odds of overweight and obesity conferred by long sleep did not show consistent and significant increases over the years. Analyses based on aggregated data showed very short sleepers had 30% greater odds of being overweight or were twice as likely to be obese, relative to 7-8 hour sleepers. Likewise, short sleepers had 20% greater odds of being overweight or 57% greater odds of being obese. Long sleepers had 20% greater odds of being obese, but no greater odds of being overweight. CONCLUSIONS: Our findings support the hypothesis that prevalence of very short and short sleep has gradually increased over the last 32 years. Inadequate sleep was associated with overweight and obesity for each available year.

BACKGROUND: Excessive daytime sleepiness (EDS) often occurs as a result of insufficient sleep, sleep apnea, illicit substance use, and other medical and psychiatric conditions. This study tested the hypothesis that blacks exhibiting EDS would have poorer self-reported adherence to hypertensive medication using cross-sectional data from the Counseling African-Americans to Control Hypertension (CAATCH) trial. METHODS: A total of 1,058 hypertensive blacks (average age 57+/-12 years) participated in CAATCH, a randomized controlled trial evaluating the effectiveness of a multilevel intervention for participants who receive care from community health centers in New York City. Data analyzed in this study included baseline sociodemographics, medical history, EDS, and medication adherence. We used the Epworth Sleepiness Scale, with a cutoff score of >/=10, to define EDS. Medication adherence was measured using an abbreviated Morisky Medication Adherence scale, with a score >0 indicating nonadherence. RESULTS: Of the sample, 71% were female, 72% received at least a high school education, 51% reported a history of smoking, and 33% had a history of alcohol consumption. Overall, 27% of the participants exhibited EDS, and 44% of those who exhibited EDS were classified as adherent to prescribed antihypertensive medications. Multivariable logistic regression analysis, adjusting for effects of age, body mass index, sex, education, and smoking and drinking history indicated that participants who exhibited EDS were more than twice as likely to be nonadherent (odds ratio 2.28, 95% confidence interval 1.42-3.67, P<0.001). CONCLUSION: Analysis of the CAATCH data showed a high prevalence of EDS among hypertensive blacks. EDS is a significant predictor of nonadherence to prescribed medications for hypertension. These findings point to a modifiable variable that can be targeted in future interventions focusing on medication adherence.