Understanding and Development of New Therapies for Heart Failure - Lessons from Recent Clinical Trials -

Transcription

1 Understanding and Development of New Therapies for Heart Failure - Lessons from Recent Clinical Trials -

2 Clinical trials Evidence-based medicine, clinical practice Impact upon Understanding pathophysiology Changing clinical practice through clarifying risk/benefit of intervention Cons Cannot address all questions Art of medicine not studied Trial patients not like real-world patients Long duration, expensive,

3 100 Large-scale Clinical Trials over 20 yrs ACE inhibitors Beta blockers Angiotensin receptor blockers (ARB( ARB s) CCB s,, vasodilators, inotropes Anti-arrhythmic agents Device strategies like ICD, RCT Surgical intervention, immunomodulation, anticoagulation, exercise

4 PROBABILITY OF DEATH VHefT - 1 Placebo (273) Prazosin (183) Hz + ISDN (186) N Engl J Med 1986;314: MONTHS

5 ACEI in Severe Heart Failure 0.8 PROBABILITY OF DEATH p< Placebo p< Enalapril 0.1 CONSENSUS N Engl J Med 1987;316: MONTHS

6 ACEI in Mild to Moderate Heart Failure % MORTALITY n = 2589 CHF - NYHA II-III -EF < 35 SOLVD (Treatment) N Engl J M 1991;325: p = Placebo n=1284 Enalapril n= Months

7 ACEI In Asymptomatic LV Dysfunction p = 0.30 Placebo n=2117 % MORTALITY n = 4228 No CHF symptoms EF < 35 SOLVD (Prevention) N Engl J Med 1992;327: Enalapril n= Months

8 SAVE Radionuclide EF 40% AIRE Clinical and/or radiographic signs of HF All-Cause Mortality TRACE Echocardiographic EF 35% Probability of Event Placebo ACE-I Placebo: 866/2971 (29.1%) ACE-I: 702/2995 (23.4%) 0.05 OR: 0.74 ( ) Years ACE-I Placebo Flather MD, et al. Lancet. 2000;355:

9 Survival CIBIS-II II β blockers in CHF All-cause Mortality Survival US Carvedilol Study Risk reduction = 34% P < Time after inclusion (days) Risk reduction = 65% P < CIBIS-II II Investigators (1999) Carvedilol (n = 696) Placebo (n = 398) Days Packer et al (1996) Bisoprolol Placebo Mortality % MERIT-HF P = Metoprolol CR/XL Placebo Risk reduction = 34% Months of follow-up The MERIT-HF Study Group (1999)

10 ARB s in heart failure ELITE, ELITE-II II Losartan vs. captopril in old patients similar primary end point RESOLVED candesartan

11 Spironolactone - RALES n=1,663, NYHA III-IV, EF 35%, 24months, Spironolactone mg Probability of Survival Spironolactone (n=822) Placebo (n=841) Months Pitt B, et al. RALES study. N Engl J Med 1999:341:709.

12 Neurohormonal & cytokine adjustment Myocardial injury Cardiac function Acute (adaptive) Activation of SAS, RAAS Endothelin, AVP, Inflammatory cytokines, Oxidative stress Chronic (maladaptive) Hypertrophy, Remodeling, Apoptosis

13 Established guideline from past clinical trials ACE inhibitors in all patients with LV systolic dysfunction who can tolerate them ARB s in ACE inhibitor intolerant patients with LV systolic dysfunction Beta blockers in stable patients with mild to moderate symptoms without significant congestion Aldosterone antagonists in moderate to severe HF

14 Recent clinical trials impacting HF therapy Beta blockers Angiotensin-aldosterone antagonists Angiotensin receptor blockers Aldosterone antagonist Other medical therapeutics NEP inhibitor Anticytokines Antiarrhythmic agent t-type type CCB s Device ICD RCT

15 COMET

16 Effects of Different β Blocking Agents NE NE Bisoprolol Metoprolol NE Carvedilol β 1 β 2 α 1 Cofactors Cardiac cell toxicity

17 All-cause mortality COPERNICUS 100 % Survival Placebo P = % risk reduction Carvedilol Months. Packer et al. NEJM 2001

18 COMET Recent beta blocker trials COMET, carvedilol vs. metoprolol carvedilol is better COPERNICUS, carvedilol carvedilol in severe (class IIIB & IV) HF 35 % mortality reduction CAPRICORN, carvedilol in post-mi HF(EF<40%) 23 % reduction in all-cause mortality risk reduction BEST, bucindolol Only non-statistically insignificant reduction in mortality and morbidity MOXCON, moxonidine,, centrally acting beta blocker Increased mortality CAPRICORN BEST MOXCON

19 Recent Angiotensin-Aldosterone Aldosterone Antagonist Trials Angiotensin receptor blockers OPTIMAAL : losartan in post-mi LV dysfunction Valsartan : Val-HeFT HeFT,, VALIANT Candesartan : CHARM programme Aldosterone antagonist Eplerenone : EPHESUS

20 Val-HeFT : Valsartan vs. Placebo n=5,010, NYHA II-IV, EF 40%, 23months Conventional Tx(including ACE inhibitors) + Valsartan 160mg bid Probability of Survival (%) P= Months Add Valsartan Valsartan (n=2,511) Placebo (n=2,499) Probability of Event-free Survival (%) % Hospitalization, Improvement of EF, NYHA class, Sx and Signs P=0.009 Placebo (n=2,499) Valsartan (n=2,511) 13.3% Risk Reduction P= Months Cohn JN, et al. N Engl J Med 2001;345:1667.

21 Val-HeFT : Valsartan vs. Placebo n=5,010, NYHA II-IV, EF 40%, 23months Combined End Point (Death from Any Cause, Cardiac Arrest with Resuscitation, Hospitalization for Worsening HF, IV Inotropes or Vasodilators) Combined End Point ACEi +, -blocker - ACEi +, -blocker + ACEi -, -blocker - ACEi -, -blocker + Death ACEi +, -blocker - ACEi +, -blocker + ACEi -, -blocker - ACEi -, -blocker Valsartan better RR, 95% CI Placebo better Cohn JN, et al. N Engl J Med 2001;345:1667.

22 CV Death, MI, or HF by Treatment 0.4 Captopril Valsartan Probability of Event Valsartan + Captopril VALIANT Months 0 Valsartan vs. Captopril: HR = 0.96; P = Valsartan + Captopril vs. Captopril: HR = 0.97; P = Pfeffer, McMurray, Velazquez, et al. N Engl J Med 2003;349

23 Candesartan in Heart Failure Assessment of Reduction in Mortality and Morbidity CHARM Programme 3 component trials comparing candesartan to placebo in patients with symptomatic heart failure CHARM Alternative n=2028 LVEF 40% ACE inhibitor intolerant CHARM Added n=2548 LVEF 40% ACE inhibitor treated CHARM Preserved n=3025 LVEF >40% ACE inhibitor treated/not treated Primary outcome for each trial: CV death or CHF hospitalisation Primary outcome for Overall Programme: All-cause death Pfeffer et al, Lancet 2003

24 CHARM-Alternative Primary outcome, CV death or CHF hospitalisation % Placebo 406 (40%) 334 (33%) 30 Candesartan HR 0.77 (95% CI ), p= Adjusted HR 0.70, p< Number at risk years Candesartan Placebo Granger et al, Lancet 2003

25 % 50 CHARM-Added Primary outcome, CV death or CHF hospitalisation 40 Placebo 538 (42.3%) 483 (37.9%) 30 Candesartan Number at risk HR 0.85 (95% CI ), p=0.011 Adjusted HR 0.85, p= years Candesartan Placebo McMurray et al, Lancet 2003

26 CHARM-Preserved Primary outcome, CV death or CHF hospitalisation % Placebo Candesartan 366 (24.3%) 333 (22.0%) Number at risk HR 0.89 (95% CI ), p=0.118 Adjusted HR 0.86, p= years Candesartan Placebo Yusuf et al, Lancet 2003

27 ARB s in Heart Failure esp. valsartan & candesartan Alternative in patients who are intolerant to ACE inhibitors Added to standard therapy Avoid using with both ACE inhibitor and beta blockers, esp. valsartan

28 All cause mortality Cardiovascular mortality and hospitalization Eplerenone can be added to standard therapy in post-mi patients Sudden cardiac death EPHESUS Epelerenone Post-acute myocardial infarction Heart failure Efficacy and SUrvival Study

29 Recent clinical trials other medical therapeutics - NEP inhibitor omapatrilat(overture) Anticytokines Endothelin antagonists : bosentan, enrasentan TNF-alpha antagonist : etanercept, infliximab Antiarrhythmic agent Dofetilide Calcium channel blockers Mibefradil increased mortality by 11%

30 TNF in heart failure

31 Recent clinical trials using device ICD MADIT-II, II, SCD-HeFT RCT(Resynchronization therapy) or bi-ventricular pacing MIRACLE, COMPANION

32

33 CRT Cardiac Resynchronization Therapy

34 COMPANION Pharmacological therapy plus CRT mortality 23.7 % CRT + ICD mortality 43.4 % CRT : Cardiac Resynchronization Therapy ICD : Implantable cardioverter defibrillator

35 Treatment of Heart Failure Stage A Risk control Stage B ACEI Beta blockers ICD in proper Pt Secondary prevention Modification of physical activity Stage C ACEI, BB Diuretics, Digoxin ARB s, aldosteone Antagonist Consider ICD+CRT Stage D Inotropes Specialized therapy Transplantation Mechanical assist

36 Lessons from Recent HF Clinical Trials Mortality and morbidity of HF is still high. Beta blockers Carvedilol seems better than metoprolol Added benefit with carvedilol even in post-mi and severe HF ARB s is valuable as an alternative to ACEI intolerant patients or can be added to standard therapy. CRT(bi-ventricular pacing) coupled with ICD is superior to medical therapy alone in selected HF population. More aggressive blockade of neurohormonal or cytokine activation is not necessarily beneficial.

37 Saturation of Benefit with Incremental Neurohormonal Blockade in Chronic Heart Failure Aldosterone antagonists VAL-HeFT CHARM

38 Potential Therapeutic Target Beyond Neurohormonal Activation CRT ICD