Cardiac Dysfunction in Obstructive Sleep Apnea Patients: Prevalence of and Effect of nCPAP
The aim of this study is to clarify the influence of obstructive sleep apnea syndrome on left ventricular function using echocardiographic parameters including the myocardial performance index (Tei-index), and to determine the short-term effects of nCPAP on them.
|Study Design:||Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||The Clinical Significance of an Index of Cardiac Function, Tei-Index, in Obstructive Sleep Apnea Syndrome Patients.|
- Effect of nCPAP treatment on echocardiographic parameters including LVEF, left ventricular mass, ratio of E to A (E/A) and mitral deceleration time (DT) from the mitral inflow velocity, and Tei-index. [ Time Frame: baseline, 1 month, 3months ]
- Effect of nCPAP treatment on plasma brain natriuretic peptide (BNP) level. [ Time Frame: baseline, 1 month, 3 months ]
|Study Start Date:||November 2004|
|Study Completion Date:||November 2006|
Obstructive sleep apnea syndrome (OSAS) affects 2% and 4% of middle-aged women and men respectively, and is associated with an increased risk of cardiovascular complications. Therefore, cardiovascular consequences must be evaluated in the clinical management of OSAS and the study of cardiac functional parameters could be particularly useful. Reported findings are conflicting with respect to the influence of OSAS and nasal continuous positive airway pressure (nCPAP) on left ventricular function. In this study, we assess cardiac dysfunction with echocardiographic parameters, such as LVEF, left ventricular mass, ratio of E to A (E/A) and mitral deceleration time (DT) from the mitral inflow velocity, and Tei-index, or plasma brain natriuretic peptide (BNP) level at baseline, and 1 and 3 months after nCPAP treatment. The main endpoint is the comparison of echocardiographic parameters and BNP between OSAS patients and control subjects, and the changes of them after short-term of nCPAP treatment.
|Second Department of Internal Medicine, Nagasaki University School of Medicine|
|Nagasaki, Japan, 852-8501|
|Study Chair:||Satoshi Ikeda, M.D., Ph.D.||Second Department of Internal Medicine, Nagasaki University School of Medicine|