| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Chronic Heart Failure With Reduced Ejection Fraction | 
 
 
 | 
| E.1.1.1 | Medical condition in easily understood language  | 
 | 
| E.1.1.2 | Therapeutic area  | Diseases [C] - Cardiovascular Diseases [C14] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.0 | 
 
| E.1.2 | Level  | LLT | 
 
| E.1.2 | Classification code  | 10008908 | 
 
| E.1.2 | Term  | Chronic heart failure | 
 
| E.1.2 | System Organ Class  | 100000004849 | 
 
 
 | 
| E.1.3 | Condition being studied is a rare disease  |  No  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
To evaluate the effect of treatment with omecamtiv mecarbil compared with placebo on the time to cardiovascular (CV) death or first HF event, whichever occurs first, in subjects with chronic HF with reduced ejection fraction (HFrEF) receiving standard of care (SoC) therapy.
 
 An HF event is defined as presentation of the patient for an urgent, unscheduled clinic/office/ED visit, or hospital admission, with a primary diagnosis of HF, where the patient exhibits new or worsening symptoms of HF on presentation, has objective evidence of new or worsening HF, and receives initiation or intensification of treatment specifically for HF (Hicks et al, 2015).  Changes to oral diuretic therapy do not qualify as initiation or intensification of treatment. | 
 
 
 | 
| E.2.2 | Secondary objectives of the trial  | 
To evaluate the effects of OM on time to:
 - CV death
 - HF hospitalization
 - all-cause death
 
 To evaluate the effects of treatment with OM on change in patient-reported outcomes (PROs). | 
 
 
 | 
| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
Subject has provided informed consent
 Male or female, ≥ 18 to ≤ 85 years of age at signing of informed consent
 History of chronic HF (defined as requiring treatment for HF for a
 minimum of 30 days before randomization)
 LVEF ≤ 35%, per subject's most recent medical record, within 12 months
 prior to screening. The most recent qualifying LVEF must be at least 30 days
 after any of the following, if applicable: 1) an event likely to decrease EF
 (eg, myocardial infarction, sepsis); 2) an intervention likely to increase
 EF
 (eg, cardiac resynchronization therapy, coronary revascularization); or
 3) the first ever presentation for HF.
 NYHA class II to IV at most recent screening assessment
 Managed with HF SoC therapies consistent with regional clinical practice
 guidelines according to investigator judgment of subject's clinical status
 Oral SoC therapies for chronic HF (eg, beta blockers, renin-angiotensinaldosterone
 system inhibitors) should be present, if not
 contraindicated. Subjects enrolled during either HF hospitalization or
 early after HF hospitalization discharge can be reinitiating or titrating
 oral SoC chronic HF therapies at the same time of randomization with
 the goal of achieving optimized therapy on study.
 Currently hospitalized with primary reason of HF OR one of the following
 events within 1 year to screening: 1) hospitalization with primary reason
 of
 HF; 2) urgent visit to ED with primary reason of HF
 B-type natriuretic peptide (BNP) level ≥ 125 pg/mL or an NT-proBNP
 level ≥ 400 pg/mL at most recent screening assessment (subjects
 receiving
 angiotensin receptor-neprilysin inhibitor [ARNi] must use NT-proBNP
 assessment; for subjects in atrial fibrillation/flutter at screening, the cut
 off
 levels are: BNP ≥ 375 pg/mL or NT-proBNP ≥ 1200 pg/mL) | 
 
 
 | 
| E.4 | Principal exclusion criteria | 
Factors expected to interfere with the subject's availability or ability to
 complete all protocol-required study visits or procedures, and/or to
 comply with
 all required study procedures to the best of the subject and
 investigator's knowledge (including ongoing substance abuse).
 Inability to swallow study medication tablet (eg, swallowing disorders,
 feeding tubes)
 Receiving mechanical hemodynamic support (eg, intra-aortic balloon
 pump counterpulsation), or invasive mechanical ventilation ≤ 7 days
 prior to
 randomization
 Receiving IV inotropes (eg, dobutamine, milrinone, levosimendan) or IV
 vasopressors (eg, epinephrine, norepinephrine, dopamine, or
 vasopressin)
 ≤ 3 days prior to randomization
 Receiving IV diuretics or IV vasodilators, supplemental oxygen therapy,
 or non-invasive mechanical ventilation (eg, bilevel positive airway
 pressure
 [BiPAP] or continuous positive airway pressure [CPAP] ≤ 12 hours prior
 to randomization (Note: the use of non-invasive ventilation for sleep
 disordered breathing is permitted)
 Acute coronary syndrome (ST-elevation myocardial infarction, non-ST elevation myocardial infarction, unstable angina), stroke, or transient
 ischemic attack, major cardiac surgery or cardiac intervention (ie,
 implantation of cardiac closure devices, cardiac resynchronization
 therapy, or catheter ablation), percutaneous coronary intervention, or
 valvuloplasty/other cardiac valve repair or implantation within the 3
 months prior to randomization
 Insertion of other cardiac devices (eg, implantable cardioverter
 defibrillator, permanent pacemaker, monitoring devices) within 30 days
 prior to
 randomization
 Severe uncorrected valvular heart disease, hypertrophic or infiltrative
 cardiomyopathy, active myocarditis, constrictive pericarditis, or clinically
 significant congenital heart disease | 
 
 
 | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Composite of time to CV death or first HF event, whichever occurs first. | 
 
 
 | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
 | 
| E.5.2 | Secondary end point(s) | 
Time to CV death.
 Change in Kansas City Cardiomyopathy Questionnaire Total Symptoms Score (KCCQ TSS) from baseline to Week 24.
 Time to first HF hospitalization.
 Time to all-cause death. | 
 
 
 | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
 | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  No  | 
| E.6.3 | Therapy |  Yes  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  Yes  | 
| E.6.7 | Pharmacodynamic |  Yes  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  Yes  | 
| E.6.10 | Pharmacogenetic |  No  | 
| E.6.11 | Pharmacogenomic |  No  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  No  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  No  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  No  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  No  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  No  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  Yes  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 20 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 322 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  Yes  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  No  | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Argentina | 
 
| Australia | 
 
| Austria | 
 
| Belgium | 
 
| Brazil | 
 
| Bulgaria | 
 
| Canada | 
 
| Chile | 
 
| China | 
 
| Colombia | 
 
| Czech Republic | 
 
| Denmark | 
 
| France | 
 
| Germany | 
 
| Greece | 
 
| Hungary | 
 
| Italy | 
 
| Japan | 
 
| Mexico | 
 
| Netherlands | 
 
| New Zealand | 
 
| Poland | 
 
| Portugal | 
 
| Romania | 
 
| Russian Federation | 
 
| Slovakia | 
 
| South Africa | 
 
| Spain | 
 
| Sweden | 
 
| Switzerland | 
 
| Turkey | 
 
| Ukraine | 
 
| United Kingdom | 
 
| United States | 
 
 
 | 
| E.8.7 | Trial has a data monitoring committee |  Yes  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
                     | 
| The end of study is when the last subject has completed the end of study assessments. | 
 
 
 | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 4 | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial years | 4 |