Low Gradient Severe AS: Who Qualifies for TAVR? Andrzej Boguszewski MD, FACC, FSCAI Vice Chairman, Cardiology Mid-Michigan Health Associate Professor
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1 Low Gradient Severe AS: Who Qualifies for TAVR? Andrzej Boguszewski MD, FACC, FSCAI Vice Chairman, Cardiology Mid-Michigan Health Associate Professor Michigan State University, Central Michigan University 1
2 Disclosures Chiesi Pharma-Consultant 2
3 Background Aortic valve stenosis One of the most prevalent valvular heart disease in developed countries 85,000 valve procedures 15,000 deaths per year in North America AVR is indicated for severe AS and either symptoms or LV dysfunction. Certain asymptomatic patients. 3
4 Severity Grading AVA<1.0 cm2, mean gradient >40 mmhg, Vmax >4 m/s Up to 40% patient have discordant Doppler findings - AVA<1.0 cm2, mean gradient <40 mmhg, Vmax <4 m/s 4
5 Hemodynamic characteristics Aortic stenosis Flow Gradient Classic AS (EF>50%) Classic LF,LG (EF<50%) Paradoxical LFLG (EF>50%) NL (Svi>35ml/m2) Reduced (CI <3 L/m/m2, Svi<35 ml/m2) Reduced (CI <3 L/m/m2, Svi<35 ml/m2) High (>40 mmhg) Low (<40mmHg) Low (<40mmHg) NFLG (EF>50%) NL Low (<40 mmhg) Normal SV ml/m ( ml/min with exercise), Stroke volume index ml/m2 5
6 ECHO calculation for SV(i) 6
7 Not so classic aortic stenosis 1. Low Flow, Low Gradient Severe AS 2. Paradoxical Low Flow, Low Gradient Severe AS
8 Low flow, low gradient AS with low EF EF<50%, AVA <1.0 cm2, mean gradient <40 mmhg 5-10% of severe AS Low flow state gradient may be pseudo-normalized (underestimate stenosis severity) AVA may be pseudo-severe (overestimate severity) Often associated with CAD (Syntax>22 worse outcomes) Enlarged cavity with low ejection fraction More often functional MR Intrinsic cardiomyopathy Marie-Annick Clavel et al. JIMG 2017;10:
9 10
10 Dobutamine stress ECHO Low dose up 20 mcg/kg/min Attempt to increase flow volume across the AV Parameter cut offs: Peak stress mean gradient, mm Hg 40* Peak stress AVA, cm * Absolute increase in AVA cm2 <0.3 Circ Cardiovasc Imaging. 2014;7:
11 Contractile reserve Dobutamine up to 20 mcg/kg/min Stroke volume increase >20% Vmax> 0.6 m/s Mean gradient increase >10 mmhg JACC Imaging 2013;6:
12 Importance Contractile (flow) Reserve Group 1= contractile reserve (survival benefit p=0.001) Group II= No contractile reserve (trend of survival benefit p=0.07) BUT!! Higher surgical mortality rate of 22-33% (no reserve) vs 5-8% (flow reserve) JACC 2012;60:
13 What if DSE shows inadequate flow reserve? What if patient has adverse reaction to Dobutamine? What if patient has poor echo windows? Variable flow response to Dobutamine Paradoxical LFLG AS 14
14 Contractile (flow) reserve If no contractile reserve, can we predict the valve area by artificially normalizing flow? 15
15 TOPAS Study Projected AVA Extrapolation of what the EOA would at standardized flow rate chosen to be 250 ml/s based on observed flow rates found in patients with severe AS and normal flow. EOA and mean trans-valvular flow is proposed to represent valvular compliance Q=VTI J Am Soc Echocardiogr 2010;23:
16 Projected AVA New parameter has been shown to be more closely related to actual AS severity, impairment of myocardial blood flow, LV flow reserve, and survival than the traditional DSE parameters. The full potential of the EOAProj remains to be determined by future studies Circulation 2008;118:S J Am Soc Echocardiogr 2010;23:
17 Multi-slice CT and valvular calcium score Aortic valve calcium load, AU Women >1200 Men >2000 Aortic valve calcium density, AU/cm2 Women >300 Men >500 18
18 TAVR may be attractive in LFLG AS Circ Cardiovasc Interv. 2017;10:1-9 19
19 TOPAS-TAVI Registry (true or pseudo-severe AS) 287 pts with LFLG AS DSE Primary endpoint of mortality Change in EF 20
20 TOPAS-TAVI Registry 30 day mortality of 3.8% Significant EF improved in >50% patients Lack of contractile reserve did not influence outcomes Late mortality 39% JACC 2018;71:
21 Paradoxical LFLG AS 22
22 Paradoxical LF-LG AS LVEF>50% Low stroke volume (Svi<35 ml/m2) AVA <1.0 cm2 (AVAi <0.6cm2/m2) Mean gradient <40 mmhg 5-15% of patients (F>Male) usually elderly Small LV cavities with LVH Other factors- MR,MS, atrial fibrillation, TR 23
23 PLFLG Aortic stenosis JACC Imaging 2017;10:
24 25
25 26
26 PARTNER I Trial Analysis in PLFLG AS Circulation. published online May 9,
27 PLFLG AS Based on anatomical and hemodynamic features Prevalence in women, small LV cavity with restrictive physiology, small annulus. At risk for patient prosthesis mismatch (AVAi<0.85 cm2/m2 post surgery). TAVR offers a larger EOA. Post hoc analysis of PARTNER 1A suggests that TAVR is superior to SAVR in PLFLG AS Circ Cardiovasc Imaging. 2014;7: Circulation.2013;127:
28 (Class IIa) Circ Cardiovasc Imaging. 2014;7:
29 JACC Imaging 2017;10:
30 Severe AS 31
31 Select type of AVR JAmCollCardiolImg2017;10:
32 Conclusions Low EF, low flow, low gradient AS have poor outcomes. TAVR improves mortality regardless of flow, gradient or EF. Given lower procedural risk and superior valve hemodynamics of TAVR. This may be preferred over SAVR for low flow or EF. 35
33 Questions: Which statement regarding Classic low flow, low gradient AS is true? a. Mortality is similar to normal flow, high gradient AS b. Predominantly not associated with CAD c. No mortality benefit is AVR with no contractile reserve d. Transcatheter AVR may be the preferred interventional treatment modality over SAVR 36
34 Question 2 What is the preferred supporting test for the diagnosis of paradoxical LFLG aortic valve stenosis? a. Abnormal exercise treadmill stress b. Aortic valve density score >300 in women c. Elevated Pro-BNP d. Coronary calcium score >2000 AU in men 37
35 Question 3 Which statement is false regarding the TOPAS- TAVI registry? a. TAVR was associated with low 30 day mortality b. Dobutamine stress echo failed to predict clinical outcomes c. TAVR was associated with worsening LVEF d. Anemia, pulmonary disease and residual PVL was associated with poorer outcomes 38
36 References Clavel et al. Cardiac Imaging for assessing low-gradient severe aortic valve stenosis. JACC Imaging 2017;10: Ribeiro et al. Transcatheter Aortic Valve Replacement in Patients with Low-Flow, low gradient Aortic Valve stenosis. JACC 2018;71: Nishimura et al AHA/ACC Guideline for the Management of Patients with Valvular Heart Disease. JACC 2014;63(22):e
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