Correlation between twofold left ventricular outflow tract-velocity time integral and stroke volume index in mechanicaly ventilated patients
نویسندگان
چکیده
Introduction Ultrasound is a non-invasive and bedside accessible method of cardiac function monitoring. Cardiac echocardiography has several limitations due to difficulties to obtain an acceptable acoustic window in critical care settings. Left ventricular outflow tract (LVOT) velocity time integral (VTI) can be measured in most critical care patient and is an useful tool for this purpose. Calculations of cardiac output needing aortic valve area are strongly dependent on skills and observers [1]. We hypothesize that twofold LVOT-VTI is an accurate calculation of stroke volume index (SVI).
منابع مشابه
عملکرد سیستولی قلب در بیماران سیروزی کاندید پیوند کبد در مقایسه با گروه کنترل
Background: We assessed different systolic cardiac indices to describe left and right ventricular dysfunction in cirrhotic patients before liver transplantation. Methods: In this case-control study, eighty-one consecutive individuals with the confirmed hepatic cirrhosis and candidate for liver transplantation in the Imam Khomeini Hospital between March 2008 and March 2010 were selected. T...
متن کاملThe Effects of Hemodynamic Changes on Pulse Wave Velocity in Cardiothoracic Surgical Patients
The effect of blood pressure on pulse wave velocity (PWV) is well established. However, PWV variability with acute hemodynamic changes has not been examined in the clinical setting. The aim of the present study is to investigate the effect of hemodynamic changes on PWV in patients who undergo cardiothoracic surgery. Using data from 25 patients, we determined blood pressure (BP), heart rate (HR)...
متن کاملEchocardiographic assessment of valve stenosis: EAE/ASE recommendations for clinical practice.
Abbreviations: AR aortic regurgitation, AS aortic stenosis, AVA aortic valve area, CSA cross sectional area, CWD continuous wave Doppler, D diameter, HOCM hypertrophic obstructive cardiomyopathy, LV left ventricle, LVOT left ventricular outflow tract, MR mitral regurgitation, MS mitral stenosis, MVA mitral valve area, DP pressure gradient, RV right ventricle, RVOT right ventricular outflow trac...
متن کاملStenotic Aortic Valve Area
I n aortic stenosis, the aortic valve area (AVA) is intuitively the most appealing measure of severity because it is supposed to be (largely) independent of stroke volume and left ventricular pump function and reflects most closely “stenosis.” Calculation of the AVA by the continuity equation is routinely performed in echocardiography (1), using 3 measurements: the velocity-time integral of the...
متن کاملRelation of Dimensionless Index to Long-Term Outcome in Aortic Stenosis With Preserved LVEF.
OBJECTIVES The aim of this study was to assess the role of the dimensionless index (DI) in a registry of patients with aortic stenosis (AS) to objectively establish prognostic DI thresholds for various degrees of AS severity. BACKGROUND DI is a classic marker of severity in AS that does not rely on the estimation of the left ventricular outflow tract (LVOT) cross-sectional area. Although DI e...
متن کامل