Right Ventricular Function in Obstructive Sleep Apnea

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00640536
Recruitment Status : Completed
First Posted : March 21, 2008
Last Update Posted : December 1, 2008
Information provided by:
Florence Nightingale Hospital, Istanbul

Brief Summary:
The purpose of this study is to determine the structural and functional cardiac alterations in obstructive sleep apne (OSA) independent from systemic and pulmonary arterial hypertension and their correlation to the severity of OSA.

Condition or disease
Sleep Apnea, Obstructive

Detailed Description:
Many risk factors for OSA, such as male gender, obesity, and increasing age are the same as for cardiovascular diseases. This fact makes it more difficult to establish a causal relationship between OSA and cardiovascular diseases. The relationship between OSA and right ventricular (RV) function is controversial. RV dysfunction may be a result of chronic intermittent hypoxia and hypercapnia during apneic episodes. It may also occur secondary to left ventricular dysfunction as a result of increased afterload and sympathetic activity which causes secondary hypertension. As systemic hypertension is one of the most accompanying and contributing factors in OSA along with obesity, we tried to compare the effects of newly diagnosed OSA on RV function with an age and body mass index- matched control group.

Study Type : Observational
Actual Enrollment : 53 participants
Observational Model: Case Control
Time Perspective: Prospective
Official Title: The Evaluation of Subclinical Right Ventricular Dysfunction in Obstructive Sleep Apnea Patients Without Systemic and Pulmonary Arterial Hypertension Using Velocity Vector Imaging
Study Start Date : June 2006
Actual Primary Completion Date : June 2008
Actual Study Completion Date : June 2008

Newly diagnosed obstructive sleep apnea patients without systemic and pulmonary arterial hypertension
Age, sex and and body mass index-matched matched healthy subjects

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Tertiary care clinic, obstructive sleep apnea patients

Inclusion Criteria:

For OSA patients (group1)

  • Apnea Hypopnea Index equal or more than 15
  • Epworth sleepiness scale equal or more than 10
  • No previous treatment for OSA

Exclusion Criteria:

  • Age < 18 years
  • Known hypertension, or 24-hour mean blood pressure of 135 and/or 85 mmHg or more
  • Mean pulmonary artery pressure > 25 mmHg
  • Diabetes mellitus
  • Left ventricular ejection fraction < 60%
  • Moderate to severe valvular disease
  • Cardiomyopathy
  • Renal failure
  • Coronary artery disease
  • Obstructive or restrictive lung disease demonstrated on pulmonary function test
  • Connective-tissue or chronic thromboembolic disease
  • Pericardial disease
  • Cancer and/or other important comorbidities with an expected survival < 2 years
  • Suboptimal echocardiographic images for measurements

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00640536

Florence Nightingale Hospital
Istanbul, Caglayan, Turkey, 34381
Sponsors and Collaborators
Florence Nightingale Hospital, Istanbul
Principal Investigator: Saide Aytekin T.C. Istanbul Bilim University, Florence Nightingale Hospital, Division of Cardiology

Responsible Party: Prof. Dr. Saide Aytekin, T.C. Istanbul Bilim University; Florence Nightingale Hospital Identifier: NCT00640536     History of Changes
Other Study ID Numbers: AT-1974/1
First Posted: March 21, 2008    Key Record Dates
Last Update Posted: December 1, 2008
Last Verified: November 2008

Additional relevant MeSH terms:
Sleep Apnea, Obstructive
Sleep Apnea Syndromes
Respiration Disorders
Respiratory Tract Diseases
Signs and Symptoms, Respiratory
Signs and Symptoms
Sleep Disorders, Intrinsic
Sleep Wake Disorders
Nervous System Diseases