Low Gradient AS: Multi-Imaging Modalities
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1 Low Gradient AS: Multi-Imaging Modalities Philippe Pibarot, DVM, PhD, FACC, FAHA, FESC, FASE Canada Research Chair in Valvular Heart Diseases Institut Universitaire de Cardiologie et de Pneumologie de Québec / Québec Heart & Lung Institute Université LAVAL
2 Disclosure Philippe Pibarot Financial relationship with industry: Ø Edwards Lifesciences Ø V-Wave Other financial disclosure: Ø Research Grants from Canadian Institutes of Health Ø Research and Heart & Stroke Foundation of Quebec Off label Use: None
3 LOW GRADIENT AS AVA<1.0 cm2 MG<40 mmhg <50% LVEF >50% SVi <35 ml/m2 «CLASSICAL» LOW-FLOW LOW-GRADIENT D2 Stage «PARADOXICAL» LOW-FLOW LOW-GRADIENT D3 Stage >35 ml/m2 NORMAL LOW-FLOW LOW-GRADIENT D? Stage
4 Two Different Patterns of Low-Flow, Low-Gradient AS NORMAL-LVEF «PARADOXICAL» LOW-FLOW LOW-GRADIENT 10-15% Pibarot & Dumesnil JACC, 2012 LOW-LVEF «CLASSICAL» LOW-FLOW LOW-GRADIENT 5-10%
5 The Role of Multi-Modality Imaging in Low Gradient AS Ø Corroborate measurements of stroke volume / AVA and differentiate normal-flow vs. low-flow, -gradient AS low Ø Diffentiate true vs. pseudo-severe stenosis Ø Optimize risk stratification and therapeutic decision making: flow reserve, myocardial fibrosis
6 NORMAL-LVEF «PARADOXICAL» LOW-FLOW LOW-GRADIENT LOW-LVEF «CLASSICAL» LOW-FLOW LOW-GRADIENT LVEF=60% SV=46 ml MG=29 mmhg LVEF=25% SV=42 ml MG=25 mmhg
7 Classical Low-Flow, Low-Gradient AS with Reduced LVEF LVEF=25% SV=42 ml MG=25 mmhg
8 Low-Flow, Low-Gradient Severe(?) AS True-Severe AS Normal Flow Low Flow AVA P Gradient = Q2 K AVA2 Pseudo-Severe AS Low Flow Normal Flow
9 LVEF 50% AVA 1.0 ΔP<40 Dobutamine-Stress Echo / Cath. SV < 20 % SV 20 % Contractile (Flow) Reserve ΔP 40 AVA 1.0 No Contractile (Flow) Reserve AS Severity: Indeterminate ΔP<40 AVA>1.0 No True-Severe AS SAVR CABG TAVR PCI MSCT: AoV Ca Score >1200 >2000 Yes Pseudo-Severe AS True-Severe AS HF Therapy SAVR (High Op. Risk) TAVR? BAV+TAVR?
10 2014 ACC/AHA Guidelines on Management of VHD: Indications for AVR in AS Definition: AVA 1.0 cm2, LVEF<50% Mean gradient < 40 mmhg, Recommendation AVR is reasonable in symptomatic patients with low LVEF, lowflow/low-gradient severe AS with a DSE that shows a mean gradient 40 mm Hg with an AVA 1.0 cm2 at any dobutamine dose Nishimura, Otto et al. JACC 2014 Stage: D2 Class Level IIa B
11 2012 ESC/EACTS Guidelines on Management of VHD: Indications for AVR in AS Severe AS on DSE: Increase in AVA <0.2 cm2 with final AVA <1 cm2; mean gradient >40 mmhg) Flow reserve: >20% increase in stroke volume Vahanian et al. EHJ 2012
12 Resting Echo LVEF=40% SV= 53 ml AVA= 0.77 cm2 P= 49 / 29 mmhg Case #1 DSE LVEF=50% SV= 73 ml AVA= 0.75 cm2 P= 92 / 52 mmhg
13 Case #1: ØContractile/flow reserve: Yes ØStenosis severity: True-severe
14 Case #2 Resting Echo SV= 34 ml LVEF=15% Peak P= 18 mmhg Mean P= 12 mmhg AVA= 0.85 cm2 DSE SV= 46 ml LVEF=25% Peak P= 21 mmhg Mean P= 13 mmhg AVA= 1.2 cm2
15 Case Study #2: ØContractile/flow reserve: Yes ØStenosis severity: Pseudo-severe
16 Resting Echo Case #2 LVEF=25% SV= 51 ml AVA= 0.8 cm2 P= 46 / 27 mmhg DSE LVEF=30% SV= 57 ml AVA= 0.8 cm2 P= 52 / 30 mmhg
17 Case #2: ØContractile/flow reserve: No ØStenosis severity: Indeterminate
18 Usefulness of AoV Ca Scoring by MDCT to Fig. 4 Differentiate True vs. Pseudo- Severe Stenosis in Low-Flow, Low-Gradient AS Pseudo-Severe True-Severe AVC: 1034 AU AVC: 4682 AU Clavel et al. JACC 2013: AVC Score to identify Severe AS: >1200AU in >2000 AU in
19 Fig. 4 Mayo-Québec-Bichat Collaboration: Accuracy of AVC to identify severe AS 100 Sensibility, (%) Case #2: 2010 AU Specificity, (%) Gender Threshold AUC Sensitivity (%) Specificity (%) PPV (%) NPV (%) Women 1274 AU Men 2065 AU Clavel et al. JACC 2013
20 Mayo-Québec-Bichat Collaboration: Impact of AVC on Survival In patients with AS Whole Cohort Clavel et al. JACC 2014 Patients treated Medically
21 Paradoxical Low-Flow, Low-Gradient AS with Preserved LVEF Age Women Hypertension MetS Diabetes LVEF=60% SV=46 ml MG=29 mmhg
22 Ø 75 y.o. female Case #3 ØCalcific AS ØNYHA class III ØNo CAD at angio ØLVEF: 73% ØLVEDV: 38 ml/m2 ØSVi: 26 ml/m2 ØAS severity at catheter: Ø AVA: 0.85 cm2 Ø Indexed AVA: 0.5 cm2/m2 Ø Mean gradient: 32 mmhg Courtesy of Dr G Dreyfus, Monaco Hospital
23 Guidelines on Management of VHD: Indications for AVR in Paradoxical Low-Flow, Low-Gradient AS Definition: AVA 1.0 cm2, Indexed AVA 0.6 cm2/m2 Mean gradient < 40 mmhg, LVEF 50%, SVi<35 ml/m2 Stage: D3 Guidelines Recommendation for AVR Class ESC-EACTS 2012 AVR should be considered in symptomatic patients with low flow, low gradient (<40 mmhg) AS with normal EF only after careful confirmation of severe AS. IIa ACC-AHA 2014 AVR is reasonable in symptomatic patients who have low-flow, low-gradient severe AS who are normotensive and have an LVEF 50% if clinical, hemodynamic, and anatomic data support valve obstruction as the most likely cause of symptoms Vahanian et al. EHJ 2012 Nishimura, Otto et al. JACC 2014 IIa
24 Usefulness of Stress-Echocardiography to Differentiate True vs. Pseudo- Severe Stenosis in Paradoxical, Low-Flow, Low-Gradient AS REST Peak ΔP: 51 Mean ΔP: 29 AVA: 0.70 LVEF: DSE 15 µg/kg/min 51 patients with PLF-LG 94 mmhg 57 mmhg 0.75 cm % Clavel et al. JACC Imaging 2013
25 Case #4 Ø 82 y.o. woman ØHypertension treated with ACEI Ø No CAD ØNYHA III, hospitalization for HF ØLVEF: 65% ØModerate-Severe Diastolic Dysf. ØAS severity on echo: Ø AVA: 0.64 cm 2; indexed AVA: 0.36 cm 2/m 2 Ø Peak/mean gradient: 44/26 mmhg
26 Usefulness of AoV Ca Scoring by MDCT to Fig. 4 Differentiate True vs. Pseudo- Severe Stenosis in Low-Flow, Low-Gradient AS Pseudo-Severe True-Severe AVC: 1034 AU AVC: 4682 AU Clavel et al. JACC 2013: AVC Score to identify Severe AS: >1200AU in >2000 AU in
27 Case #4: Computed Tomography AVC Score: 3200 AU
28 Patients with low-flow, low-gradient AS have more myocardial fibrosis Paradoxical Low-Flow, Low-Gradient Preserved LVEF Hermann et al. JACC 2011;58;
29 LOW-GRADIENT SEVERE (?) AS MG<40 mmhg AVA<1.0 cm2 AVAi<0.6 cm2/m2 LVEF>50% Corroborate measurements of STEP #1: Measurement Error? SV, AVA, MG by other Reassess methods: No Echo, CMR, cath. Identify causes NORMAL-FLOW, STEP #2: Low Flow (SVi<35 ml/m2)? No of Low Flow LOW-GRADIENT AS LOW-FLOW, LOW Ye -GRADIENT AS s STEP #3: Symptoms? No CLOSE FOLLOW-UP Ye s Anti-hypertensive Therapy Yes STEP #4: Hypertension? PseudoSevere No Rule out pseudo-severe AS: - AoV Calcium by MDCT - Dobutamine Stress Echo STEP #5: Stenosis Severity? True-Severe Assess degree of myocardial fibrosis by CMR SAVR / TAVR / BAV+TAVR
30
31 Usefulness of NTP Stress-Catheterization to Differentiate True vs. Pseudo- Severe Stenosis in Paradoxical, Low-Flow, Low-Gradient AS Nishimura & Carabello; Circulation, 2012;125:
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