Randomized Trials Eric A. Cohen MD, FRCPC Schulich Heart Centre - PowerPoint PPT Presentation

Management of Stable Angina in Multivessel Disease: Reconciling the Results of the Randomized Trials Eric A. Cohen MD, FRCPC Schulich Heart Centre Sunnybrook Health Sciences Centre Toronto ON ACC Rockies March 11, 2014

Mgmt of Multivessel Disease Disclosure – Eric Cohen Relevant to this presentation: • Consulting / Advisory Board - Medtronic Vascular

Mgmt of Multivessel Disease Disclosure – Eric Cohen Relevant to this presentation: • Consulting / Advisory Board - Medtronic Vascular • Volume dependent (i.e. mostly fee for service) interventional cardiologist

Management of Stable Angina in Multivessel Disease: Reconciling the Results of the Randomized Trials • Management, not revascularization . . .

Management of Stable Angina in Multivessel Disease: Reconciling the Results of the Randomized Trials • How relevant is it to distinguish the acuity of the presentation?

Management of Stable Angina in Multivessel Disease: Reconciling the Results of the Randomized Trials • Is it angina that matters or is it ischemia?

Mgmt of Multivessel Disease rec·on·cile (verb) • to find a way of making (two different ideas, facts, etc.) exist or be true at the same time • to cause people or groups to become friendly again after an argument or disagreement

Management of Stable Angina in Multivessel Disease: Reconciling the Results of the Randomized Trials Reconcile because . . . • various trials yield discordant results? • the trial results don’t match our pre -conceived notions? • the patients in the trials don’t look like those in our day to day practice?

Management of Stable Angina in Multivessel Disease: Reconciling the Results of the Randomized Trials And in the end . . . I promise to tell you whether surgery is truly better than PCI

Mgmt of Multivessel Disease 1. Does revascularization matter?

Mgmt of Multivessel Disease Meta-Analysis of CABG vs. Medical Therapy: 7 Randomized Trials Mortality Yusuf S et al, Lancet 1994

Extension of Survival (in months) at 10 Years After CABG in Various Subgroups N=1300 N=150 N=550 Relevance today is unclear. There was minimal or no use of effective medical therapy (ASA, statins, beta-blockers, ACE inhibitors). Yusuf et al. Lancet. 1994;344:563-570.

STITCH: CABG + OMT vs. OMT in CAD/CHF Primary Endpoint: All-Cause Mortality (ITT) HR 0.86 (0.72, 1.04) As treated P = 0.123 HR 0.70 (0.58, 0.84) Adjusted HR 0.82 (0.68, 0.99) P <0.001 Adjusted P = 0.039 0.46 (218/610) 0.41 (244/602) Per protocol HR 0.76 (0.62, 0.92) P = 0.005 Velazquez E et al., NEJM 2011;364:1607-16

PCI Did Not Reduce Death or MI 2,287 SIHD patients randomized to PCI+OMT vs. OMT Optimal Medical Therapy (OMT) 1.0 18.5% 0.9 PCI + OMT 19.0% 0.8 0.7 Hazard ratio: 1.05 0.6 95% CI (0.87-1.27) P = 0.62 0.5 0.0 0 1 2 3 4 5 6 7 Years Number at Risk Medical Therapy 1138 1017 959 834 638 408 192 30 PCI 1149 1013 952 833 637 417 200 35 Boden et al NEJM 2007

BARI 2D • 2,368 SIHD patients with diabetes randomized to revascularization + OMT or OMT alone • Primary endpoint: all-cause death BARI 2D Study Group. N Engl J Med 2009;360:2503-2512.

Mgmt of Multivessel Disease 1. Does revascularization matter? • What prevents mortality from stable CAD? • PCI vs CABG • Large group of pts for which the mode of revascularization does not seem to matter • What prevents mortality from the common cold? • decongestant vs cough suppressant

Mgmt of Multivessel Disease 2. Does the acuity of presentation matter? • Data on revascularization vs med Rx more compelling in ACS • Very little comparative data on PCI vs CABG in unstable disease • More pts are identified and treated in the acute phase, thus fewer who present in a chronic phase • More challenging to do trials involving management of stable CAD

Mgmt of Multivessel Disease 3. Are the trial results fundamentally different?

10 RCTs 7812 Pts: CABG vs. PCI: No Difference in Death and MI Death or myocardial infarction (%) 35 35 CABG PCI 30 30 25 25 Mortality (%) 20 20 15 15 10 10 5 5 0 0 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 Years of follow-up Years of follow-up No. of patients* CABG 3889 3767 3675 3415 3180 2693 1853 1609 1477 CABG 3695 3369 3269 3001 2763 2294 1501 1269 1161 PCI 3923 3798 3709 3431 3205 2658 1828 1576 1452 PCI 3725 3419 3310 3023 2797 2267 1491 1253 1150 Hlatky et al, The Lancet 2009;373:1190-1197

Revascularization in Diabetic Patients: Randomized Trials - Diabetic Subgroup BARI Trial - Main Results Non-Diabetic - CABG Non-Diabetic - PTCA Diabetic - CABG Diabetic - PTCA

Revascularization in Diabetic Patients: Registry Data - Diabetic Subgroup BARI Trial - Registry vs Randomized; Insulin vs Oral

CABG vs PCI :Death and Diabetic Status 35 CABG no diabetes CABG diabetes 30 PCI no diabetes PCI diabetes 25 Mortality (%) 20 15 10 5 0 0 1 2 3 4 5 6 7 8 Years of follow-up Number of patients* CABG no diabetes 3263 3169 3089 2877 2677 2267 1592 1380 1274 CABG diabetes 615 587 575 532 498 421 257 225 200 PCI no diabetes 3298 3217 3148 2918 2725 2281 1608 1393 1288 PCI diabetes 618 574 555 508 475 373 218 179 160 Hlatky et al, The Lancet 2009;373:1190-1197

Mgmt of Multivessel Disease

Mgmt of Multivessel Disease • In the modern era of stenting and optimum medical therapy, revascularisation of patients with diabetes and multivessel disease by CABG decreases long-term mortality by about a third compared with PCI using either BMS or DES. CABG should be strongly considered for these patients.

Mgmt of Multivessel Disease Fastest growing industries - 2013

Mgmt of Multivessel Disease The single fastest growing industry . . . With “meta - analysis” in the title PubMed Decade listings 1960’s 0 1970’s 2 1980’s 254 1990’s 2455 2000’s 9912 In the same time period 2010 - 2014 18635 there were 6565 entries with “clinical trial” in the title

Mgmt of Multivessel Disease 4. Are my patients similar to the patients in these trials?

Indications for CABG vs PCI in stable patients with lesions suitable for both procedures and low predicted surgical mortality Subset of CAD by anatomy Favours CABG Favours PCI 1VD or 2VD – non proximal LAD IIb C I C 1VD or 2VD – proximal LAD I A IIa B 3VD simple lesions, full functional revascularization I A IIa B achievable with PCI, SYNTAX score ≤ 22 3VD complex lesions, incomplete revascularizarion I A III A achievable with PCI, SYNTAX score > 22 Left main (isolated or 1VD, ostium/shaft) I A IIa B Left main (isolated or 1VD, bifurcation) I A IIb B Left main + 2VD or 3VD, SYNTAX score ≤ 32 I A IIb B Left main + 2VD or 3VD, SYNTAX score ≥ 33 I A III B ESC guidelines 2010

Mgmt of Multivessel Disease 4. Are my patients similar to the patients in these trials?

“ In theory, theory and practice are the same. In practice, they are not. ” Albert Einstein

Trials of PCI vs CABG: generalizability Few With Highly selected Mainly 1 or 2 diabetic preserved population vessel disease patients LVEF

SYNTAX score – randomized vs registry

Cardiac Cath, PCI and CABG in Ontario Trends in Volumes (FY 1999-2010) 70000 60000 50000 Case Volume 40000 Cath 30000 PCI CABG 20000 10000 0 Mgmt of Multivessel Disease

PCI:CABG Ratio 2000/01 -2010/11 3.5 3 2.5 PCI:CABG 2 1.5 1 0.5 0 Mgmt of Multivessel Disease

Groupings of Hospitals by PCI:CABG ratio for VRPO cohort (N=8,972) 7.00 Low Ratio Low - Medium Ratio Medium - High Ratio High Ratio 6.15 6.00 Overall PCI / CABG Ratio 4.90 5.00 4.75 3.91 4.00 3.24 3.24 Overall Ratio = 2.7 3.01 2.91 2.79 3.00 2.39 2.24 2.14 2.14 1.92 1.79 2.00 1.40 1.33 1.00 0.00 Sault Ste Marie Peterborough Rouge Valley Thunder Bay Toronto East St. Michael's Sunnybrook Dieu Southlake St. Mary's Hamilton Kingston Sudbury London Trillium Ottawa - Hotel UHN Hospital Mgmt of Multivessel Disease

Multivariate Logistic Regression Model for Predicted Probability of Being Treated with PCI Rather than CABG (N=4,285) Odds Ratio Lower Upper Variable Est 95% CL 95% CL p-value Anatomy (vs 3 vessel) 1 vessel 37.6 28.1 50.2 <.001 2 vessel 5.6 4.5 7.0 <.001 Left main 0.3 0.2 0.4 <.001 Prior CABG 28.7 17.9 45.9 <.001 Indication (vs Elective stable CAD) Unstable angina 0.9 0.7 1.1 0.3 NSTEMI 1.3 1.1 1.7 0.02 Non-emergent STEMI 1.6 1.0 2.4 0.03 Emergent STEMI 7.6 5.1 11.3 <.001 Physician factors (vs. Non-interventionalist) Interventionalist 1.4 1.2 1.7 <.001 Hospital factors (vs Low Ratio Hospitals) Low-Medium ratio hospitals 1.3 1.0 1.7 0.02 Medium-High ratio hospitals 2.0 1.5 2.6 <.001 High Ratio Hospitals 3.7 2.7 4.9 <.001 C-statistic=0.89.*Also adjusted for age/gender, diabetes and previous PCI CL = Confidence limit Mgmt of Multivessel Disease