«Paradoxical» low-flow, low-gradient AS with preserved LV function: A Silent Killer
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1 «Paradoxical» low-flow, low-gradient AS with preserved LV function: A Silent Killer Philippe Pibarot, DVM, PhD, FACC, FAHA, FESC, FASE Canada Research Chair in Valvular Heart Diseases Université LAVAL
2 Disclosure: None except that Gilbert Habib is a very good friend!
3 Disclosure: None except that Gilbert Habib is a very good friend! This is a very hot topic!
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6 There s No Smoke without Fire
7 Burning Questions about Paradoxical Low-Flow, Low-Gradient AS: Does it exist? Does it have impact on survival? Does AVR help?
8 Paradoxical Low-Flow, Low-Gradient AS: Does it exist?
9 NORMAL-LVEF NORMAL-FLOW HIGH-GRADIENT Two Different Patterns of Low-Flow, Low-Gradient AS 50-70% NORMAL-LVEF «PARADOXICAL» LOW-FLOW LOW-GRADIENT 10-15% LOW-LVEF «CLASSICAL» LOW-FLOW LOW-GRADIENT 5-10% Pibarot & Dumesnil JACC, 2012
10 Case Study 78 y.o. female with history of calcific AS NYHA class III Mild hypertension No evidence of obstructive CAD LVEF: 60% AS severity on echo: AVA: 0.7 cm 2 BSA: 1.7 m 2, indexed AVA: 0.4 cm 2 /m 2 Peak/mean gradient: 51/29 mmhg
11 Case Study: Discrepancy between AVA and Gradient LVEF: 60% Small LV cavity: LVEDD: 39 mm LVEDV: 79 ml
12 LVOT-D: 2.0 cm LVOT-A: 3.1 cm 2 LVOT-VTI: 15 cm Peak ΔP: 51 mmhg Mean ΔP: 29 mmhg Ao-VTI: 65 cm LVOT- SV: 46 ml (SVi=27 ml/m 2 ) 2D Volumetric method to corroborate SV measure: LVEDV (79 ml) LVEF (60%) = 48 ml / AVA: 0.7 cm 2
13 Dobutamine Stress Echocardiography Multislice CT 15 µg/kg/min Peak ΔP: 94 mmhg Mean ΔP: 57 mmhg AVA: 0.77 cm 2 Valve Calcium score: 1900 AU
14 Age Women Hypertension MetS - Diabetes Hachicha Z et al., Circulation, 2007 Dumesnil et al. Eur Heart J, 2009 Pibarot & Dumesnil JACC, in press, 2012
15 Patients with paradoxical low-flow AS have abnormal myocardial systolic function Adda et al. Circulation CV Imaging, 2012 Normal -Flow High Gradient Low-Flow Low-Gradient Lancellotti et al. Eur J Echo 2010 Lee et al. J Am Soc Echocardiogr, 2011
16 Pronounced Concentric Remodeling High Arterial Load Impaired Diastolic Filling Impaired Longitudinal systolic function Atrial Fibrillation Mitral Stenosis Mitral Regurgitation Tricuspid Regurgitation Ejection time Reduced Forward Stroke Volume Reduced Transvalvular flow rate Low-Flow AS Despite Preserved LVEF Pibarot & Dumesnil, Circulation 2013
17 Normal Flow AS Paradoxical Low-Flow AS LVEDV: 115 ml LVEF: 60% SV: 70 ml AVA: 0.7 cm 2 P: 45 mmhg LVEDV: 85 ml LVEF: 60% SV: 50 ml AVA: 0.7 cm 2 P: 25 mmhg
18 Prevalence of Paradoxical Low-Flow, Prevalence (%) 30 Low-Gradient AS Colonne2 5 0 Hachicha 2006 Echo (512 pts) Barasch 2006 Echo (215 pts) Cramariuc 2009 Echo (1591 pts) Minners 2010 Echo (333 pts) Minners 2010 Cath (333 pts) Hermann 2011 Echo & Cath (86 pts) Adda 2011 Echo (150 pts) Lancellotti 2012 Echo (150 pts) Paradoxical Low-Flow, Low-Gradient AVA<1.0 cm 2; MG<40 mmhg LVEF>50%; SVi<35 ml/m 2 Mohty 2013 Cath (768 pts)
19 Lauten et al. JACC 2013 Invasive Hemodynamic Characteristics of Low-Flow, Low-Gradient Severe AS Despite Preserved LVEF Occurrence of paradoxical low-flow, low-gradient AS was confirmed by invasive hemodynamics and was not the result of a systematic bias in the echo calculation of AVA
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21 Paradoxical Low-Flow, Low-Gradient AS: Does it have impact on survival?
22 Hachicha Z et al., Circulation. 115: , 2007
23 Outcome of Patients with Paradoxical Low-Flow, Low-Gradient AS 150 Pts with asymptomatic severe (AVA<1.0 cm 2 ) AS LVEF>50% Lancellotti P, Magne J et al. J Am Coll Cardiol. 59:235 43, 2012
24 Outcome of Patients with Paradoxical Low-Flow, Low-Gradient AS Eleid et al. Circulation 2013 Ozkan Circulation 2013
25 Mohty et al. Circulation 2013 Outcome in Paradoxical Low-Flow, Low-Gradient Severe Aortic Stenosis and Preserved LVEF A Cardiac Catheterization Study
26 Outcome of Patients with Paradoxical Low-Flow, Low-Gradient AS Case Match Study: patients Clavel et al. JACC 2012
27 Outcome of Patients with Paradoxical Low-Flow, Low-Gradient AS Conclusions: Patients with paradoxical LFLG AS exhibit marked concentric remodelling, impaired LV longitudinal function and worse prognosis Normal-flow, low-gradient AS patients have outcomes similar to moderate AS Mehrota et al. Eur Heart J 2013
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29 Outcome of Patients With Low-Gradient "Severe" Aortic Stenosis and Preserved LVEF A Substudy of the SEAS trial AVA<1.0 ΔP<40 AVA: ΔP<40 AVA<1.0 ΔP>40 Jander et al. Circulation. 2011;123:
30 Potential Causes of Discordance between AVA (e.g. 0.8) and gradient (e.g. 30) in Pts. With Preserved LVEF Measurement errors Small body size Inconsistency in guidelines criteria Paradoxical low-flow, low-gradient severe AS Minners et al. Eur Heart J, 2008
31 Paradoxical low flow severe AS Measurement error Small body size Inconsistency in guidelines criteria Jander et al. Circulation. 2011;123:
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33 Criteria for Paradoxical low-flow AS EDD<47 mm EDV< 55 ml/m 2 RWT ratio > 0.50
34 N=69 N=28 Barone-Rochette, Circ CV Imaging 2013 N=17 N=14
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36 Conclusion: Paradoxical low-flow, low-gradient AS is a associated with severe prognosis
37 Conclusion: Paradoxical low-flow, low-gradient AS is associated with severe prognosis. Its prognosis does not seem to be improved by surgery.
38 Paradoxical Low-Flow, Low-Gradient AS: Does AVR help?
39 Outcome of Patients with Paradoxical Low-Flow AS Patients with indexed AVA<0.6 cm 2, LVEF 50% Percentage of Patients Treated Surgically NF 65 % 47 % PLF ΔP: 40±15 32±17 Hachicha Z et al., Circulation. 115: , P < Overall Survival (%) Surgical Surgical Medical Medical Follow-up (years) NF: Normal Flow: SVI>35 (65%) PLF: Paradoxical Low Flow: SVI 35 (35%)
40 Impact of AVR on Survival in Patients with Paradoxical Low-Flow, Low-Gradient AS Clavel MA JACC in press Clavel et al. JACC 2012 Tarantini et al. Ann Thorac Surg, 91: , 2011
41 Impact of AVR on Survival According to LVEF in Patients with Low Gradient LVEF< 35% 168 patients AVA 0.8 cm 2 ΔP 30 mmhg LVEF < 35-54% LVEF 55% Pai et al., Ann Thorac Surg 86: , 2008
42 Impact of AVR on Survival in Patients with Low-Gradient Severe AS and Preserved LVEF 102 patients, AVA<1.0 cm 2 ΔP Mean < 40 mmhg LVEF 50% Whole Cohorts Propensity Score-Matched Cohorts Tarantini et al. Ann Thorac Surg, 91: , 2011
43 Impact of AVR on Outcome of Symptomatic Patients with Severe Stenosis, Low Gradient, and Preserved LVEF 260 symptomatic Pts Severe AS (AVAi<0.6 cm 2 /m 2 ) Low gradient (<40 mmhg) Preserved LVEF (>50%) Ozkan et al. Circulation 2013
44 Impact of AVR on Outcome of Symptomatic Patients with Severe Stenosis, Low Gradient, and Preserved LVEF 1704 Patients Eleid et al. Circulation 2013
45 2-Year Death (%) PARTNER-I (Cohorts A+B) Paradoxical LF, NEF, and LG (12% of cohort) 90% 80% 70% LF NEF LG A - TAVR LF NEF LG A - Surgery LF NEF LG B - TAVR LF NEF LG B - Std Rx log rank p= % 60% 50% 40% 30% 20% 56.5% 41.1% 39.7% 10% 0% Days Numbers at Risk A TAVR A Surgery B TAVR B Std Rx Herrmann et al. Circulation 2013
46 2012 ESC/EACTS Guidelines on Management of VHD: Indications for AVR in AS The newly recognized entity of paradoxical low-flow, lowgradient AS with normal EF requires special attention because of the limited amount of data on the natural history and outcome after surgery Vahanian et al. EHJ 2012
47 LVEF 50% SVi<35 ml/m 2 AVA 1.0 ΔP<40 Symptomatic Exercise Stress Echo / Dobutamine Stress Echo MSCT AoV Ca Score ΔP AVA< ΔP<30-40 AVA <1200 <2000 >1200 >2000 True-Severe AS SAVR CABG TAVR PCI? BAV+TAVR? Pseudo-Severe AS HTN Therapy True-Severe AS SAVR CABG TAVR PCI? BAV+TAVR?
48 Answers to Burning Questions: Paradoxical low-flow, low-gradient AS Does it exist: YES! this a real entity that occurs in 10-15% of AS patients Does it have impact on survival: YES! Does AVR help: YES! AVR improves outcome in patients with true paradoxical low-flow, lowgradient severe AS TAVR may provide a valuable alternative to SAVR
49 Key Messages: Paradoxical Low-Flow AS When confronted to AVA-gradient discordance: 1- Rule out measurement errors 2- Rule out small body size 3- Document the presence of low-flow: SVi<35 ml/m 2 4- Identify typical echo features of paradoxical LFLG: Small LV with concentric remodeling, impaired filling, reduced longitudinal function 5- Identify other causes of low flow: AFib, MR, TR, MS, bradychardia 6- Rule out pseudo-severe AS: MSCT and stress echo
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