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Etiology of Sleep Apnea-related Hyperaldosteronism - BP Treatment

Information source: University of Alabama at Birmingham
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Obstructive Sleep Apnea; Resistant Hypertension; Hyperaldosteronism

Intervention: Spironolactone (Drug); BP medication uptitration (Drug)

Phase: N/A

Status: Completed

Sponsored by: University of Alabama at Birmingham

Summary

Hypertension affects an estimated 60-70 million Americans, predisposing them to potentially life threatening cardiovascular complications. Resistant hypertension, defined as uncontrolled blood pressure on 3 or more different antihypertensive agents, is common, affecting 15-20% of the entire hypertensive population or an estimated 12-14 million Americans. Although associated with obesity, increasing age, black race, and chronic kidney disease, mechanisms of treatment resistance remain obscure. The investigators' laboratory identified primary aldosteronism (PA) as a common cause of treatment resistance with a prevalence of 20% among subjects with resistant hypertension. This is clinically important because recognition of PA can lead to effective treatment with use of aldosterone blockers. Obstructive sleep apnea (OSA) is strongly associated with and predicts development of hypertension as demonstrated in landmark cohort studies including the Sleep Heart Health Study and the Wisconsin Sleep Cohort Study. The investigators' laboratory has confirmed OSA to be extremely common in subjects with resistant hypertension, with a prevalence of approximately 85%. Recognizing that PA and OSA are exceptionally common in subjects with resistant hypertension, the investigators hypothesized that the 2 may be causally related. In testing this hypothesis, the investigators recently reported that plasma aldosterone levels are positively correlated with OSA severity in subjects with resistant hypertension but not in normotensive control subjects. This observation suggests that there is an important mechanistic interaction between untreated OSA and aldosterone excess in subjects with resistant hypertension. While the investigators' original hypothesis was that OSA stimulates aldosterone release, the investigators recognize that the opposite may also be true; that is, aldosterone excess in subjects with resistant hypertension worsens OSA. Distinguishing between these two possibilities has potentially far-reaching clinical implications. If the former hypothesis is true, effective treatment of OSA would be expected to suppress aldosterone release in subjects with resistant hypertension, thereby reversing the underlying cause of their treatment resistance. If the latter hypothesis is true, use of mineralocorticoid receptor antagonists would be expected to reduce OSA severity in subjects with resistant hypertension, thereby enhancing treatment of OSA. Either scenario would represent a new treatment approach for a highly prevalent and serious medical problem.

Clinical Details

Official title: Randomized Controlled Trial of Spironolactone Versus Standard of Care Blood Pressure Treatment on the Severity of Obstructive Sleep Apnea in Patients With Resistant Hypertension

Study design: Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Primary outcome: Severity of Obstructive Sleep Apnea

Eligibility

Minimum age: 19 Years. Maximum age: 80 Years. Gender(s): Both.

Criteria:

Inclusion Criteria:

- Resistant hypertension defined as office BP that is uncontrolled with 3 or more

antihypertensive medications

- Moderate-severe OSA defined as AHI ≥15 events/hr

- Self-reported adherence >80% with prescribed antihypertensive medications.

Exclusion Criteria:

- Ongoing use of a potassium sparing diuretic

- History of congestive heart failure (ejection fraction of <40%)

- Chronic kidney disease (creatinine clearance <60 ml/min)

- History of cardiovascular disease (stroke, TIA, myocardial infarction, or

revascularization procedure)

- Known or suspected history of secondary cause of hypertension other than primary

aldosteronism

- Severe nocturnal hypoxemia (O2 desaturation nadir <60%)

- White coat hypertension defined as office BP >140/90 mm Hg and ambulatory daytime BP

<135/85 mm Hg

- Central sleep apnea (defined as 5% or more of the apneas as central apneas) and/or

the presence of any Cheyne-Stokes breathing

- Subjects working shift work or having other known circadian rhythm disorders such

that their sleep-wake schedule is altered

- Excessive daytime sleepiness as indicated by an Epworth score of >10

- Pregnant Women

Locations and Contacts

University of Alabama at Birmingham, Birmingham, Alabama 35294, United States
Additional Information

Related publications:

Gaddam K, Pimenta E, Thomas SJ, Cofield SS, Oparil S, Harding SM, Calhoun DA. Spironolactone reduces severity of obstructive sleep apnoea in patients with resistant hypertension: a preliminary report. J Hum Hypertens. 2010 Aug;24(8):532-7. doi: 10.1038/jhh.2009.96. Epub 2009 Dec 17.

Starting date: January 2009
Last updated: December 13, 2013

Page last updated: August 23, 2015

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