Effect of Continuous Positive Airway Pressure for Treatment of Obstructive Sleep Apnea on Resistant Hypertension

September 30, 2019 updated by: The University of Hong Kong

Effect of Continuous Positive Airway Pressure for Treatment of Obstructive Sleep Apnea on Drug-resistant Hypertension : A Randomized Controlled Trial

The objectives of this study are to investigate the effect of continuous positive airway pressure (CPAP) treatment on blood pressure control and vascular inflammation in subjects with resistant hypertension and moderate obstructive sleep apnea (OSA).

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Resistant hypertension is defined as blood pressure that remains above goal in spite of concurrent use of 3 antihypertensive agents of different classes. Resistant hypertension is defined in order to identify patients who are at risk of having secondary causes of hypertension, and who may benefit from specific diagnostic and therapeutic applications. Despite the fact that OSA is listed as one of the causes of resistant HT , paucity of works has demonstrated the magnitude of problems of untreated OSA in subjects with resistant HT. There is so far two study demonstrating the beneficial effect of CPAP treatment in subjects with resistant HT, though both studies were flawed by not including the control group, no randomization and limited sample size. We aim at conducting a randomized controlled study to explore the beneficial effect of CPAP treatment in subjects with OSA and resistant hypertension.

Study Type

Interventional

Enrollment (Actual)

92

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • China
      • Hong Kong, China, 852
        • Queen Mary Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Age 18 - 65
  • known hypertension on ≧ 3 anti-hypertensive drugs
  • Apnea-hypopnea index ≧15
  • able to give informed written consent

Exclusion Criteria:

  • moderate renal impairment (glomerular filtration rate <30 mL/min/m2 )
  • endocrine/renal/cardiac causes of secondary HT
  • congestive heart failure and clinically fluid overloaded
  • On drugs that elevates BP e.g. NSAID, steroid
  • Non-compliance to anti-hypertensive medications
  • Unstable medical conditions such as unstable angina, recent myocardial infarction/stroke within 3 months
  • Active inflammatory/infective conditions e.g. rheumatoid arthritis
  • Excessive sleepiness that can be risky e.g. occupational driver, machine operator
  • Modification/changes of anti-hypertensive regimen within 8 weeks

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: observation
Active Comparator: continuous positive airway pressure
Device: continuous positive airway pressure
Use CPAP whenever sleep
Other Names:
  • CPAP

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
mean systolic blood pressure
Time Frame: 8 weeks
8 weeks

Secondary Outcome Measures

Outcome Measure
Time Frame
mean arterial blood pressure
Time Frame: 8 weeks
8 weeks
mean diastolic blood pressure
Time Frame: 8 weeks
8 weeks
high sensitivity C-reactive protein
Time Frame: 8 weeks
8 weeks
cardiac injury marker
Time Frame: 8 weeks
8 weeks
oxidative stress marker
Time Frame: 8 weeks
8 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

The University of Hong Kong

Investigators

  • Principal Investigator: Mary SM Ip, MD, The University of Hong Kong

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

March 1, 2009

Primary Completion (Actual)

July 1, 2019

Study Completion (Actual)

July 1, 2019

Study Registration Dates

First Submitted

April 14, 2009

First Submitted That Met QC Criteria

April 15, 2009

First Posted (Estimate)

April 16, 2009

Study Record Updates

Last Update Posted (Actual)

October 2, 2019

Last Update Submitted That Met QC Criteria

September 30, 2019

Last Verified

September 1, 2019

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • UW 09-051

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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