| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Wild-Type Transthyretin Cardiac Amyloidosis |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Cardiac Amyloidosis |  
| Hjerteamyloidose |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Cardiovascular Diseases [C14] | 
| MedDRA Classification | 
| 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 | 
| The purpose of this study is: 1) to characterize the oxidative capacity of myocardial mitochondria as well as to investigate the treatment effect of Trimetazidine (TMZ) in patients with stage 1 cardiac amyloidosis in a double-blind, placebo-controlled cross-over study;
 2) to examine the effect of TMZ at rest and during exercise on systolic and diastolic function measured by right heart catheterization (RHC) and advanced echocardiography;
 3) to investigate and characterize the morphology of myocardial myocytes and mitochondria by electron microscopy;
 4) to compare the oxidative capacity, morphology, and myocardial function of mitochondria in patients with early-stage asymptomatic disease versus patients with more advanced symptomatic disease.
 
 |  | 
| E.2.2 | Secondary objectives of the trial |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| -	Age ≥ 60 years for men. Age ≥ 70 years for women -	TC99-DPD-scintigraphy positive for cardiac involvement (Perugini II-III)
 -	Negative serum immunofixation
 -	Normal Kappa/Lambda ratio
 -	Gillmore stage I (NT-proBNP ≤ 3000 ng/L, eGFR ≥ 45 mL/min)
 -	NYHA-class I-IIa
 -	Informed consent
 
 |  | 
| E.4 | Principal exclusion criteria | 
| -	Already known, similar diagnosis o	Hereditary Transthyretin Cardiac Amyloidosis (ATTRh)
 o	Light Chain Amyloidosis (AL Amyloidosis)
 o	Monoclonal Gammopathy of Unspecified Significance (MGUS)
 o	Myelomatosis
 o	Mb. Waldenstrøm
 -	Medical treatment with loop diuretics
 -	Contraindications to TMZ (Allergic reaction, Parkinson’s Disease, Tremor, Restless Leg Syndrome, eGFR < 30 mL/min)
 -	Contraindications to TC99-DPD-skintigraphy (allergic reaction to contrast)
 -	Significant co-morbidity assessed by the investigator
 -	Patients for whom informed consent cannot be collected (mental illness, dementia)
 
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The primary end point is cardiac index measured by RHC. 
 
 
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point |  | 
| E.5.2 | Secondary end point(s) | 
| Secondary end points are mitochondrial respiration measured by high resolution respirometry, left ventricular global longitudinal strain measured by transthoracic echocardiography, and walking distance on the 6-minute walk test. |  | 
| 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 | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| 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) | No | 
| E.7.4 | Therapeutic use (Phase IV) | Yes | 
| 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 | No | 
| E.8.1.6 | Cross over | Yes | 
| 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 | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| 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 | 
| Last visit of last subject undergoing the trial. |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 3 | 
| E.8.9.1 | In the Member State concerned months | 0 | 
| E.8.9.1 | In the Member State concerned days | 0 |