Objectives. Diastology: What the Radiologist Needs to Know. LV Diastolic Function: Introduction. LV Diastolic Function: Introduction
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1 Objectives Diastology: What the Radiologist Needs to Know. Jacobo Kirsch, MD Cardiopulmonary Imaging, Section Head Division of Radiology Cleveland Clinic Florida Weston, FL To review the physiology and clinical importance of diastolic function. To briefly overview the physiology and echocardiographic patterns of diastolic dysfunction. To review the current literature on assessment of diastolic function using MRI. The ability of the ventricle to fill at low (normal) left atrial pressure. t rest and with exercise. Of equal importance to systolic function. nergy-dependent process Susceptible to disruption by various pathologies. More energy-dependent than contraction, therefore: More likely to precede systolic dysfunction. Frequency increases with age Up to 50% of patients over 70 Primary Myocardial Dilated, Restrictive, HOCM Secondary Hypertrophy Hypertension, S, I or MI, Congenital CD Ischemia, Infarct xtrinsic Tamponade, constriction Clinically indistinguishable from systolic heart failure. CC/H Guidelines (2001): The diagnosis of diastolic HF is generally based on the finding of typical symptoms and signs of HF in a patient who is shown to have a normal left ventricular ejection fraction and no valvular abnormalities on echocardiography. 1
2 Patients with diastolic heart failure: Not capable of distending a stiff LV. Capable of distending a poorly compliant LV with elevated filling pressures. Congestive symptoms result from: Pulmonary congestion Left atrial enlargement and arrhythmia Reduced cardiac capacity for exercise Patients with diastolic dysfunction are also at increased risk of future cardiac events. When present in combination of systolic failure, it is a predictor of mortality. dditionally, the degree of diastolic dysfunction may explain the clinical difference in patients with similar F. The effect of impaired diastolic function is reflected on the LV pressure-volume loop. Pressure (mmhg) Volume (ml) LV compliance Myocardial compliance (intrinsic factor) xternal factors Pericardium Right Ventricle Blood volume Intra-thoracic pressure Ventricular relaxation is divided in four phases: Isovolumic relaxation From aortic closure to LV pressure falling below L pressure arly LV filling 70-80% From mitral valve opening to LV equaling L pressure Diastasis qual pressures, no LV filling occurs trial contraction 20-70% Transmitral pressure gradient is re-established 2
3 arly LV filling The predominant factors that affect early filling are Rate of LV relaxation lastic Recoil L pressure bnormal relaxation will result in prolongation of the isovolumic relaxation time, a slower rate of decline in LV pressure, and a consequent reduction in early filling. Due to a smaller pressure difference between the L and LV. LV Diastolic Function ssessment For a given L pressure, slower LV relaxation results in a later MV opening, reduced early diastolic transmitral gradient, and a compensatory increase in the proportion of filling at atrial contraction. LV Diastolic Function ssessment Direct measurements of LV volume or pressure are impractical and usually only used for experimental studies. more practical way of assessing LV relaxation is by measuring the transmitral pressure gradients. LV Diastolic Function ssessment In recent years, non-invasive assessment of diastolic function by transthoracic Doppler echocardiography has become the most practical and clinically reliable modality used in the evaluation of diastolic function. LV Diastolic Function ssessment sample volume is placed between the mitral leaflets and Doppler tracings are obtained. 3
4 LV Diastolic Function ssessment LV Diastolic Function ssessment Several parameters which reflect the diastolic function may be obtained by analyzing the Doppler velocity tracing of blood flow through the mitral valve: early and late ( and ) diastolic flow velocities the ratio between them (/) the deceleration time the isovolumic relaxation time early and late ( and ) diastolic flow velocities. the ratio between them (/) the deceleration time the isovolumic relaxation time m m LV Diastolic Function ssessment Three patterns of diastolic filling (transmitral flow) are usually recognized: Normal Delayed Relaxation Restrictive The normal filling pattern shows a large wave, representing most of the filling volume, and a small wave. The deceleration time is short. dditionally, in patients with a normal appearing mitral flow but underlying abnormal diastolic function, a Pseudonormal pattern is described. m m 1.0 Impaired Relaxation Decrease in LV 200 ms Normal Mild Severe Compliance Young Middle ge Older IVRT Mild Moderate Severe 0.5 However, even in normal patients, ventricular compliance will change over time with age, therefore changing this normal pattern with the proportion of LV filling in early diastole () decreasing as age advances. The opposite occurs to the atrial contraction () ms Young Middle ge Older IVRT S D R Impaired Relaxation Normal Mild Severe Decrease in LV Compliance Mild Moderate Severe Patients with delayed relaxation have: Reduced filling in early diastole (impaired LV relaxation) Normal L pressure Normal Delayed Relaxation 4
5 Patients with a pseudonormal pattern have: pparently normal transmitral flow Moderate decrease in LV compliance with compensatory increase in L pressure restrictive LV filling pattern: Severe decrease in LV compliance Significantly elevated L pressures Normal Delayed Relaxation Pseudonormal Normal Delayed Relaxation Pseudonormal Restrictive Diastology for the Radiologist To differentiate between the normal and pseudonormal patterns, the mitral annulus velocity ( ) is a useful parameter. What is the relevance? MRI is considered the gold standard in the evaluation of left ventricular volumes and systolic function. Commonly used and fairly available nowadays. Newer sequences make it a robust modality for measuring flow. What can we find in the literature What can we find in the literature uthor Year Type of disease Number of Patients Findings uthor Year Type of disease Number of Patients Findings Mohiaddin, et al. Hartiala, et al. Karwatowski, et al. Karwatowski, et al. JCT 1991 m Heart J 1994 J Magn Reson Imag 1995 ur Heart J 1996 Normal and stenotic MV S Previous MI CD Proved the technique to have good correlation with echo. Volumetric mitral flow correlates with Doppler. Can also be used for quantitative measurement of the volume of blood flow across the mitral valve. arly diastolic filing velocities correlate with Doppler arly diastolic long axis myocardial velocity has a significant effect on left ventricular filling. Helbing, et al. Paelinck, et al. Rathi, et al. Rubinshtein, et al. J m Coll Cardiol 1996 m Heart J 2005 J CardioVasc MT 2008 JC 2009 Fallot HTN Prior evidence of diastolic dysfunction Cardiac myloidosis Restrictive flow is associated with decreased exercise. Combining early mitral velocity () and early diastolic septal velocities allowed similar estimation of filling pressures by MR and Doppler in good agreement with invasive measurement. Good agreement between MR and TT evaluation of Diastolic function. Moderate good correlation with echo and identified most patients with restrictive patterns. 5
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