Aldosterone and hypertension in African Americans

Clinical presentation and surgical outcomes in primary aldosteronism differ by race

BACKGROUND

Primary aldosteronism (PA) is the most common cause of secondary hypertension; early diagnosis and intervention correlate with outcomes. We hypothesized that race may influence clinical presentation and outcomes.

METHODS

We conducted a retrospective analysis of patients with PA (1997-2017) who underwent adrenal vein sampling (AVS). Patients were classified by self-reported race as black or non-black. Improvement was defined as postoperative decrease in mean arterial pressure (MAP), antihypertensive medications (AHM), or both.

RESULTS

Among patients undergoing AVS (n = 443), 287 underwent adrenalectomy. Black patients (28.2%) had higher body mass index (33.9 vs 31.8 kg/m² ; P = .01), longer median duration of hypertension (12 vs 10 years; P = .003), higher modified Elixhauser comorbidity index (2 vs 1; P = .004), and lower median income ($47 134 vs $78 280; P < .001). Black patients had similar aldosterone:renin ratios (150 vs 135.6 [ng/dL]/[ng·mL·^-1 hr^-1 ]; P = .23) compared to non-blacks. At long-term follow-up, black patients had a similar requirement for AHM (1 vs 0; P = .13) but higher MAP (100.6 vs 95.3 mm Hg; P = .004).

CONCLUSION

Black patients present with longer duration of hypertension and more comorbidities. They are equally likely to lateralize on AVS, suggesting similar disease phenotype. However, black patients demonstrate less improvement with adrenalectomy; this may reflect a delay in diagnosis or concomitant essential hypertension.

Baseline characteristics of patients in the treatment of preserved cardiac function heart failure with an aldosterone antagonist trial

BACKGROUND

Treatment of Preserved Cardiac Function with an Aldosterone Antagonist (TOPCAT) is an ongoing randomized controlled trial of spironolactone versus placebo for heart failure with preserved ejection fraction (HFpEF). We sought to describe the baseline clinical characteristics of subjects enrolled in TOPCAT relative to other contemporary observational studies and randomized clinical trials of HFpEF.

METHODS AND RESULTS

Between August 2006 and January 2012, 3445 patients with symptomatic HFpEF from 270 sites in 6 countries were enrolled in TOPCAT. At the baseline study visit, all subjects provided a detailed medical history and underwent physical examination, electrocardiography, quality of life, and laboratory assessment. Key parameters were compared with other large, contemporary HFpEF studies. The mean age was 68.6±9.6 years with a slight female predominance (52%); mean body mass index was 32 kg/m2; and comorbidities were common. History of hypertension (91% prevalence in TOPCAT) exceeded all other major HFpEF clinical trials. However, baseline blood pressure was well controlled (129/76 mm Hg; systolic blood pressure 7-16 mm Hg lower than other similar trials). Other common comorbidities included coronary artery disease (57%), atrial fibrillation (35%), chronic kidney disease (38%) and diabetes mellitus (32%). Self-reported activity levels were low, quality of life scores were comparable with those reported for patients with end-stage renal disease, and the prevalence of moderate or greater depression was 27%.

CONCLUSIONS

TOPCAT subjects share many common characteristics with contemporary HFpEF cohorts. Low activity level, significantly decreased quality of life, and depression were common at baseline in TOPCAT, underscoring the continued unmet need for evidence-based treatment strategies in HFpEF.

CLINICAL TRIAL REGISTRATION

URL: http://www.clinicaltrials.gov. UNIQUE IDENTIFIER: NCT00094302.

Rotating night shift work and disparate hypertension risk in African-Americans

OBJECTIVE

Hypertension disproportionally affects black compared with white Americans, even after accounting for known risk factors. Circadian disruption as encountered by rotating night shift workers has been associated with an increased risk for hypertension. Because blood pressure responds differently to sleep alterations in blacks compared with whites, we hypothesized that rotating night shift work may be a stronger risk factor for hypertension among blacks.

METHODS

We prospectively examined the association between rotating night shift work and the risk of hypertension in 1510 black and 94 142 white female participants of the Nurses' Health Study II who were nonhypertensive at baseline in 1991. We used Cox proportional hazards models to control for potential confounders.

RESULTS

During 16 years of follow-up (1991-2007), we identified 580 incident cases of hypertension in blacks and 23 360 cases in whites. In blacks, the multivariable hazard ratio for incident hypertension among women who worked rotating night shift for more than 12 months in the previous 2 years was 1.81 [95% confidence interval (CI) 1.14-2.87], compared with those working none. By contrast, in whites, we observed no increase in risk (hazard ratio 0.99, 95% CI 0.93-1.06). The association between shift work and hypertension varied significantly by race (P interaction = 0.01). In secondary analyses, the multivariable hazard ratio for incident hypertension in black women who ever performed rotating night shift work was 1.46 (95% CI 1.07-1.99), compared with those never working rotating night shifts. In whites, there was no increase in risk (hazard ratio 0.97, 95% CI 0.93-1.01) (P interaction < 0.01).

CONCLUSION

Rotating night shift work is independently associated with an increased risk of hypertension in blacks but not in whites.