MAKING SENSE OF MODERATE GRADIENTS IN PATIENTS WITH SYMPTOMATIC AORTIC STENOSIS
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1 MAKING SENSE OF MODERATE GRADIENTS IN PATIENTS WITH SYMPTOMATIC AORTIC STENOSIS David A. Orsinelli, MD, FACC, FASE Professor, Internal Medicine Director, Structural Heart Imaging The Ohio State University Division of Cardiovascular Medicine Columbus, Ohio 1
2 DISCLOSURES INSTITUTIONAL RESEARCH SUPPORT MEDTRONIC ABBOTT BOSTON SCIENTIFIC 2
3 MAKING SENSE OF MODERATE GRADIENTS IN PATIENTS WITH SYMPTOMATIC SEVERE AORTIC STENOSIS OR WHAT DO I DO WHEN THE NUMBERS DON T MAKE SENSE? 3
4 ASSESSING AS SEVERITY Easy when the data is concordant 83 y/o man with moderate DOE and fatigue Exam: BP 130/78; P 60 NO JVD; Carotid upstroke delayed, low volume, thrill IV / VI SEM TO Carotids, absent A2 III / VI diastolic murmur Clear lungs No edema ECHO: NL EF, AVA 0.6 cm sq, MEAN GRAD 81 mm Hg ACC / AHA Stage D1 4
5 ASSESSING AS SEVERITY: Not so easy with discordant data ~ 40% of AS patients have discordant data High gradient with AVA > 1 cm 2 High flow states (e.g. AR, fever, anemia, AV fistula, hyperthyroid) Small AVA (< 1 cm 2 ) with gradient < 40 mm Hg or Vmax <4 M/sec ~30% of patients with an Echo AVA < 1 cm 2 have a low gradient Patients may have a low EF (< 50%) or a normal EF (> 50%) with a low SVI (< 35cc/m 2 ) Patients with a normal EF, normal SVI (> 35cc/m 2 ) and small AVA?? STAGE EF AVA MEAN GRADIENT FLOW (SVI) SEVERE D1 Any < 1 > 40 NL/LOW YES D2 < 50% < 1 < 40 LOW +/- D3 > 50% < 1 < 40 LOW +/- 5 D? > 50% < 1 < 40 NL???
6 LOW FLOW LOW GRADIENT AORTIC STENOSIS: ACC/AHA STAGE D2 / D3 /D?? CLASSICAL LF-LG AS (D2) AVA <1.0 cm 2, MEAN GRADIENT < 40 mm Hg, LVEF <50%,SVI <35 cc / m % of all AS patients Males > females Often with CAD, significant MR PARADOXICAL LF-LG AS (D3) AVA <1.0 cm 2, MEAN GRADIENT < 40 mm Hg, LVEF > 50%, SVI <35 cc / m % of all AS patients Females > males, elderly, HTN NORMAL FLOW LOW GRADIENT AS (D??) AVA <1.0 cm 2, MEAN GRADIENT < 40 mm Hg, LVEF > 50%, SVI > 35 cc / m 2 Seen in up to 25% of AS patients Management not addressed in current guidelines Consider stress echo, AV calcium score 6
7 GOAL: ASSESSING AORTIC STENOSIS WHEN THE DATA DOES NOT MATCH Differentiate True Severe Aortic Stenosis (TSAS) from Pseudo Severe Aortic Stenosis (PSAP) or Moderate AS Determine which patients will benefit from AVR SYSTEMATIC APPROACH TO THE PATIENT and THE DATA 7
8 HOW TO APPROACH LOW GRADIENT SEVERE AORTIC STENOSIS Symptom Status Valve vs Non-valve etiology Reassess the primary hemodynamic data (usually echo) Technical quality of the measurements Exercise or Pharmacologic Stress Testing Stage D2 Severe AS (DSE)? Role in Stage D3 AS (? SE or DSE) Calcium scoring of the AV (MDCT)? Role of invasive testing / hemodynamics 8
9 ASSESSING AS SEVERITY: THE CONTINUITY EQUATION SV = π(lvotd/2) 2 xlvotvti SVI = SV / BSA Valve flow rate (Q) = SV / LVET Q is the flow rate across the valve during ejection and accounts for changes in LVET 9 Baumgartner et al. JASE 2017;30:372
10 ASSESSING AS SEVERITY ALWAYS REVIEW THE PRIMARY (ECHO) DATA ATTENTION TO DETAIL IN THE MEASUREMENTS ACC/AHA Guidelines: EXAMINE THE PATIENT!! REVIEW PRIOR ECHO DATA IF AVAILABLE 10
11 ASSESSING THE ECHO DATA: POTENTIAL PITFALLS IN THE ECHO DATA LVOTd / Velocity Careful review of LVOTd measurement LVOT PW sample volume at location of LVOTd measurement Technical issues (underestimate severity by underestimating gradient) CW Doppler from multiple windows Max Velocity from RPS in up to 50% of pts Technical issues (overestimate severity, AVA too small) LOVTd too small LVOTd = (5.7 x BSA) mm Differences of > 2mm(+/-) suggest measurement error May not hold for obese, BAV Contamination of the AS jet with MR 11
12 OBTAIN ADDITIONAL DATA BEYOND THE AVA AND GRADIENT Calculate the DVI (<0.25 severe AS, > 0.3 moderate AS) Use 2D / 3D volumes to calculate SV to corroborate the Doppler data 2D/3D Planimetry (if < 1 cm 2, severe AS) Anatomic area > EOA derived from continuity equation Determine degree of AV calcification with CT 12
13 PHYSIOLOGIC CAUSES of LOW FLOW (low SVI, < 35cc/m 2 ) Low EF Normal EF Impaired longitudinal function (low GLS) Concentric LV remodeling / LVH with small cavity Diastolic dysfn / poor LV filling HTN / increased afterload Significant MR / MS / TR Afib RV failure Pericardial constriction Pibarot Circ 2013;128:
14 ADDITIONAL CONSIDERATIONS IN ASSESSING AS SEVERITY in LOW GRADIENT STATES Assess valve flow rate (as opposed to SVI) Q = SV / LVET < 200 cc/sec Small body size Index AVA to BSA (< 0.6 cm 2 /m 2 ) May overestimate severity in obese HTN / reduced arterial compliance Additional afterload and early wave reflection may blunt gradient Reassess with BP controlled 14
15 LF LG SEVERE AS GUIDELINE CRITERIA ARE INCONSITENT AVA < 1 cm 2 and MEAN GRADIENT > 40 mm Hg With normal flow, AVA of 1cm 2 correlates with a mean gradient of 30 mm Hg and Vm of 3.5m/s CURRENT GUIDELINES SEEM TO WORK CLINICALLY AVA < 1.0 cm 2 IS SENSITIVE but HAS LOW SPECIFICITY IF V m < 4.0 m/s and / or mean gradient < 40 mm Hg MEAN GRADIENT > 40 mm Hg IS SPECIFIC For patients with discordant data, multi-step assessment is needed 15
16 LOW FLOW LOW GRADIENT AORTIC STENOSIS (D2) 53 Y/O MAN WITH A HEART MURMUR PRESENTED WITH DOE EXAM CONSISTENT WITH CHF, GR II/VI SEM ECHO WITH SEVERE LV DYSFUNCTION CALCIFIED AV WITH MEAN GRADIENT OF 22 mm Hg, AVA 0.6 cm 2, DI 0.16 CATH WITH NO CAD DSE ORDERED TO ASSESS TRUE vs PSEUDO AS CASE ADAPTED FROM ORSINELLI ed. COLOR ATLAS AND SYNOPSIS OF ECHOCARDIOGRAPHY MCGRAW HILL
17 DSE RESULTS Baseline 5 mcg/kg 10 mcg/kg 20 mcg/lkg Mean AV gradient (mm Hg) AV peak gradient (mm Hg) LVOT TVI (cm) AV TVI (cm) AV area (cm sq) ADAPTED FROM ORSINELLI ed. COLOR ATLAS AND SYNOPSIS OF ECHOCARDIOGRAPHY MCGRAW HILL
18 PRE OP and POST OP ECHO ADAPTED FROM ORSINELLI ed. COLOR ATLAS AND SYNOPSIS OF ECHOCARDIOGRAPHY 18 MCGRAW HILL 2015
19 19 DOBUTAMINE STRESS ECHO IN CLASSICAL LF - LG AORTIC STENOSIS (D2) Class IIa
20 DOBUTAMINE STRESS ECHO (D2) SEVERE AS vs PSUEDO-AS ASSESS CONTRACTILE RESERVE (aka FLOW RESERVE ) IMPROVEMENT IN EF (or GLS) EVIDENCE OF FLOW RESERVE (INCREASE IN SV by 20%) TRUE SEVERE AS INCREASE IN MEAN GRADIENT (> 40 mm Hg) MINIMAL CHANGE IN AVA (<1.0 cm 2 ), increase < 0.3 cm 2 AVR (Class IIa) PSEUDO SEVERE AS MEAN GRADIENT < 40 mm Hg, AVA > 1.0 cm 2, increase > 0.3 cm 2 Medical management INCREASE IN SV < 20% DIAGNOSIS / SEVERITY OF AS?? POOR PROGNOSIS ASSESS VALVE FLOW RATE (Q) and AVA projected which calculates the AVA at a standardized flow rate (250 cc / sec) Projected AVA = AVA rest + ( AVA / Q) x (250 - Q rest ) AV CALCIUM SCORE with MDCT IF SEVERE AS, CONSIDER AVR 20
21 LOW FLOW - LOW GRADIENT AORTIC STENOSIS (ACC / AHA STAGE D3) PARADOXICAL LF/LG AS (D3) AVA <1.0 cm 2,MEAN GRADIENT < 40 mm Hg, LVEF > 50%, SVI < 35cc/m 2 IF FLOW RATE (SV/LVET) IS NORMAL (> cc/sec), TSAS REVIEW PRIMARY DATA (especially the LVOTd) CAUSES OF LOW FLOW CLASSICALLY SMALL HYPERTROPHIED LV (small SV) SIGNIFICANT MS / MR / TR RV DYSFUNCTION KEY ROLE OF BP PHYSICAL EXAM UNCERTAIN ROLE OF STRESS TESTING AVR (CLASS IIa) 21
22 22 LOW FLOW - LOW GRADIENT AORTIC STENOSIS (ACC / AHA STAGE D3)
23 NORMAL FLOW LOW GRADIENT AS WITH NORMAL EF (STAGE D??) AVA <1.0 cm 2, MEAN GRADIENT < 40 mm Hg, LVEF > 50%, SVI > 35cc/m 2 NOT CONSISTENT WITH FLUID DYNAMICS INDEX TO BSA POSSIBLY DUE TO INCONSISTENT CUT POINTS or MEASUREMENT ERRORS SIMILAR OUTCOMES TO MODERATE AS AVR NOT INDICATED FOLLOW CLOSELY 23
24 AN INTEGRATED / STEP WISE APPROACH TO THE MANAGEMENT OF LOW GRADIENT SEVERE AORTIC STENOSIS Assess accuracy of data Determine type LG AS Assess gradient Assess flow (SVI) Assess EF Confirm Severe AS Stress / DSE Valve morphology Valve Calcium Score Select type of AVR 24
25 Hard Track Easy Track 25
26 ASSESSING AS SEVERITY BASED ON FLOW and GRADIENT AVA < 1 cm 2 > 35 cc/m 2 < 35 cc/m 2 > 40 mm Hg NF/HG SEVERE AS (D1) < 40 mm Hg NF /LG?? Moderate AS LF / HG SEVERE AS (D1) LF/LG? SEVERE AS (D2/D3) 26
27 CONCLUSIONS DETERMINING AS SEVERITY IN PATIENTS WITH DISCORDANT DATA IS CHALLENGING but CRITICAL IN CLINICAL DECISION MAKING ESSENTIAL to confirm severe AS ~30-50% of patients with a small AVA and LG have nonsevere AS WITH DISCORDANT DATA VERIFY THE DATA QUALITY / ACCURACY DSE IN STAGE D2 PATIENTS CALCULATE SVI IN D3 PATIENTS CONSIDER STRESS ECHO or AV CALCIUM SCORING IN D3 PATIENTS NORMAL FLOW LOW GRADIENT PATIENTS (D??) PRESENT A CHALLENGE CALCULATE RESTING FLOW RATE (Q) AND AVA projected IN SELECTED PATIENTS 27
28 28 THANK YOU
29 AVA PROJECTED AT NORMAL FLOW Requires measuring LVET in addition to usual measurements Projects AVA at a normal flow rate of 250cc / sec VC derived from AVA/ Q rather than from regression analysis of the slope Clavel JASE 2010:23:380
30 ASSESSING AS SEVERITY AVA Projected (Simplified) 142 pts with Stage D2 AS (EF < 40%) AVA projected predicted severe AS better than conventional DSE parameters (AVA peak, MG peak or AVA) Clavel JASE 2010;23:380 30
31 ASSESSING AS SEVERITY AVA Projected (Simplified) REST LVOTd = 2.0 cm; LVOT VTI 18 cm AV VTI 72; LVET 0.31s Mean gradient 21 mm Hg SV = π (2.0/2) 2 * 18 = 57 cc Q = 57/0.31= 182 cc/s AVA 0.79 PEAK LVOTd = 2.0 cm LVOT VTI 33 cm AV VTI 85; LVET 0.28s Mean gradient 39 mm Hg SV = π (2.0/2) 2 * 33=104 cc Q = 104/0.28= 370 cc/s AVA 1.22 Q = 187; AVA 0.43 Projected AVA = (0.43/ 188) x ( ) = (0.002 x188) = 0.94 TRUE SEVERE AS 32
32 ASSESSING AS SEVERITY AVA Projected (Simplified) REST LVOTd = 1.96 cm; LVOT VTI 17 cm AV VTI 60; LVET 0.31s Mean gradient 20 mm Hg SV = π (1.96/2) 2 * 17 = 51 cc Q = 51/0.31= 165 cc/s AVA 0.85 PEAK LVOTd = 1.96 cm LVOT VTI 20cm AV VTI 62; LVET 0.30s Mean gradient 31 mm Hg SV = π (1.96/2) 2 * 20=60 cc Q = 60/0.30= 201 cc/s AVA 0.97 Q = 36; AVA 0.12 Projected AVA = (0.12/ 36) x ( ) = (0.003 x85) =1.11 PSEUDO SEVERE AS 33
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