Aortic Stenosis: Spectrum of Disease, Low Flow/Low Gradient and Variants
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1 Aortic Stenosis: Spectrum of Disease, Low Flow/Low Gradient and Variants Martin G. Keane, MD, FASE Professor of Medicine Lewis Katz School of Medicine at Temple University Basic root structure Parasternal Long Axis View 1
2 Normal AV M-Mode coaptation in center of aortic root 2
3 Normal AV orientation and opening Diastole Systole N R L Aortic Stenosis Etiology Senile/Degenerative Calcific Calcification resembles ectopic bone Risk factors similar to those for atherosclerosis Renal dysfunction may accelerate Premature Calcific Bicuspid / Congenital Rheumatic Less common in the United States Less common Type 2 Hyperlipidemia, SLE, Irradiation, Paget s Dz 3
4 Calcific Aortic Stenosis: Progressive reduction in leaflet motion Spectral Doppler of the AV Apical Five Chamber AS jet AR jet 4
5 Bicuspid Aortic Valve Most common congenital anomaly (1-2%) Commissure may be horizontal or vertical Horizontal: Anterior and Posterior leaflets Vertical: Right and Left (coronary) leaflets Accel. Calcification premature stenosis Proximal aortopathy (even in normals) Associated abnormalities - coarctation Bicuspid Aortic Valve PLAX View Doming Diastole Systole 5
6 Bicuspid Aortic Valve PSAX view morphology Diastole Systole raphe raphe Systolic ellipsoid orifice identifies as Rheumatic Aortic Stenosis: Less calcification, More commissural fusion 6
7 Aortic Valve: Other Anomalies associated with AS Unicuspid AoV Quadracuspid AoV Aortic Stenosis: Physiologic Sequelae Chronic LV pressure overload Myocardial Hypertrophy Progressive, Concentric LA dilatation Progressive diastolic & systolic dysfunction END STAGE: Limited Cardiac Output After long latency SYMPTOMS: Early: Dyspnea and Fatigue (often subtle) Late: Cardinal Symptoms Chest Pressure, Syncope, Congestive Heart Failure 7
8 Evaluation of AS: Echo Essentials Valve Anatomy - establish etiology Exclude other forms of LVOT obstruction Severity of stenosis Physiologic sequelae LV hypertrophy, diastolic fxn, systolic fxn LA dilatation, Pulmonary hypertension Evaluate concurrent disease Proximal aorta and arch Aortic Valve Regurgitation, Mitral Disease Aortic Stenosis: Assessing Severity Peak AV Jet Velocity Mean AV Gradient Valve Area by continuity equation Velocity Ratio ( Dynamic Index ) Planimetry }ASE / EAE Recommend 8
9 Aortic Stenosis: Prognosis of Velocity Variable Rate of Progression Avg ~0.3 m/sec/year High rate of events, even for asymptomatic AS Peak Jet Velocity, Rate of velocity change, Functional status: predict clinical outcome Otto C, et al. Circulation (1997) 95:2262 Aortic Stenosis: Peak Velocity Continuous Wave (CW) Doppler in Apical 5 Chamber View Must be parallel to the ejection jet Confirm Right Parasternal Suprasternal also possible Use highest velocity Avoid feathery signals at tip Piedoff non-imaging probe Decrease gains & adjust baseline 18 9
10 Aortic stenosis Assessment by Peak Velocity Mild stenosis: Moderate stenosis: Severe stenosis: Very Severe or Critical stenosis: m/s m/s > 4.0 m/s > 5.0 m/s Aortic Stenosis: Peak Gradient Peak Gradient = 4 (VAV) 2 Peak Instantaneous Gradient 10
11 Instantaneous vs. Peak to Peak Echo a more physiologic measurement Doppler peak gradient always higher Doppler Cath Mean gradient and AVA should correlate Gradients are flow dependent Aortic Stenosis: Mean Gradient Mean Gradient Integration of velocity over time Estimate 0.7 * Peak Grad. Correlates with cath Peak-to-Peak gradient 11
12 Aortic stenosis Assessment by Mean Gradient Mild stenosis: < 20 mmhg Moderate stenosis: mmhg Severe stenosis: 40 mmhg Velocity and Gradient pitfall: Influence of Cardiac Output High CO = High gradient Aortic regurgitation Hyperdynamic function Low CO = Low gradient Reduced ejection fraction Small ventricular cavity/lvh High systemic vascular resistance/impedance Significant mitral regurgitation 12
13 Aortic stenosis Assessment of Valve Area Normal valve area: = 3-4 cm 2 Mild stenosis: > 1.5 cm 2 Moderate stenosis: cm 2 Severe stenosis: < 1.0 cm 2 Critical stenosis: < 0.7 cm 2 Calculation of AV Area: Continuity Equation Based on conservation of mass Flow within LVOT = Flow across AV LVOT area * VTI LVOT = AVA * VTI AV [π * (LVOT radius ) 2 ] * VTI LVOT = AVA * VTI AV [π * (LVOT radius ) 2 ] * VTI LVOT = AVA VTI AV 13
14 LVOT diameter 2.1 cm Flow through LVOT Pulse Wave Doppler Spectral Envelope With sample volume in LVOT Velocity Time Integral (VTI) flow through a single point VTI = 19 cm 14
15 Flow Across the Aortic Valve: Continuous Wave Doppler VTI = 85 cm Calculating Aortic Valve Area AVA = (Diameter LVOT / 2) 2 x π x VTI LVOT VTI AV AVA = (2.1 cm / 2) 2 x 3.14 x 19 cm 85 cm AVA = 0.7 cm 2 15
16 Continuity Equation: Pitfalls LVOT measurement Diameter is squared Can propagate large error LVOT velocity AV velocity Missing the Peak: Use multiple sites / Piedoff / highest velocity Beware MR! Doppler Velocity Index Eliminates errors of LVOT measurement DVI = VTILVOT / VTIAV Criteria for Severe AS: DVI < 0.25 Relatively flow-independent measure of stenosis 16
17 Planimetry of the Aortic Valve AVA = 1.1 cm 2 Planimetry Correlates with invasively obtained areas Flow dependent Difficult to distinguish decreased opening due to LV failure TEE superior - use of color flow area Dense calcification reduces accuracy 17
18 Summary Baumgartner H, et al. JASE (2009) 22:1-23 So My patient has severe aortic stenosis! What do I do? Does echo help me? WHEN SHOULD I OPERATE? 18
19 The Good Old Days: The Symptomatic Cliff Braunwald E, et al. Circulation (1968) 38:61-67 Stages of Disease Stage A: At risk for disease Stage B: Progressive disease Stage C: Severe disease (asymptomatic) Stage D: Severe disease (symptomatic) 19
20 Stage C can be subdivided: Stage A: At risk for disease Stage B: Progressive disease Stage C1: Severe (asymptomatic) Compensated LV Stage C2: Severe (asymptomatic) Decompensated LV Stage D: Severe disease (symptomatic) O bs e r v e O b s e r v e??? I ntervene I n t e r v e n e Guidelines Assist in Decision-Making Calcified/Thickened leaflets Reduced Systolic Opening Asymptomatic Vmax 5 m/s + low AVR risk Vmax 4 m/s EF <50% EF 50% Undergoing other CV Surgery ETT BP / ex capacity Rapid progression + low AVR risk AVR (IIa) AVR (I) AVR (I) AVR (IIa) AVR (IIb) 20
21 Low Gradient Aortic Stenosis Peak Velocity 2.74 m/sec Mean Gradient 15 mmhg Calculated AVA 0.5 cm 2 Low Output Low Gradient AS Low Ejection Fraction AVA of 0.5 cm 2, but MG of 15mmHg? WHY? Because low SV (low flow) leads to low gradients Real AS 1 o Prob: Severe obstruction to flow 2 o Prob: Depressed LVEF Improves Pseudo-AS 1 o Prob: Depressed LVEF 2 o Prob: Mild/Mod obstruction is made to look severe by SV with AVR 21
22 Low Output Low Gradient AS Dobutamine Stress Testing Increase LV contractility -> Increase Stroke Volume Increase Stroke Volume by 20% -> Real AS Peak vel/mean gradient significantly AVA stays unchanged or slightly Pseudo AS Peak vel/mean gradient minimal AVA What if LV contractility / SV don t increase? Low Gradient - Normal EF EF 50%, AVA <1 cm 2, mean grad <40mmHg Whah???... Still a stroke volume problem!! SVindex 35 ml/m 2 despite EF Typical patient: Older, h/o hypertension, women Concentric LVH, small cavity, impaired filling Markedly increased vascular impedance Pibarot P, Dumesnil JG. Heart (2010) 96:
23 Guidelines Assist in Decision-Making Suspected Low Flow AS Symptoms No Symptoms V max 4 m/s V max <4 m/s EF <50% EF 50% AVR NOT Indicated DSE MG 40mmHg or Pk Vel 4 m/s AVA index 0.6 cm 2 /m 2 and SV index <35 ml/m 2 AVR (I) AVR (IIa) AVR (IIa) Rule Out other causes for Sx!! Thank You! 23
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