AZD4831

ALT at 12 weeks relative to baseline. ALT is measured in Units per litre (U/L)

Kansas City Cardiomyopathy Questionnaire -Total Symptom Score change from baseline at 16 weeks compared with placebo Part A. The score ranges from 0 to 100, where a higher score represents a better patient outcome

Six Minute Walk Distance change from baseline at 16 weeks compared with placebo Part A

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

The relative bioavailability of a new AZD4831 formulation compared to the formulation used in an ongoing Phase 2b study and in a couple Phase 1 studies in healthy volunteers will be evaluated.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

To assess the effect of Itraconazole on AZD4831 only.

Assessment of Cmax of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of tmax of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of t½λz of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of CL/F of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of CLNR/F of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of Vz/F of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of AUClast of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of AUCinf of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Assessment of CLR of a single oral dose of AZD4831 in participants with severe renal impairment compared with that in matched healthy volunteers.

Effect of AZD4831 on AUCinf of Midazolam will be assessed.

Effect of AZD4831 on AUClast of Midazolam will be assessed.

Effect of AZD4831 on Cmax of Midazolam will be assessed.

To assess AEs as a variable of safety and tolerability of AZD4831 following oral administration of multiple-ascending doses at steady state in healthy Japanese and Chinese subjects.

To assess BP and pulse rate as a variable of safety and tolerability of AZD4831 following oral administration of multiple-ascending doses at steady state in healthy Japanese and Chinese subjects.

To assess change ECG as a variable of safety and tolerability of AZD4831 following oral administration of multiple-ascending doses at steady state in healthy Japanese and Chinese subjects.

To assess clinical chemistry/hematology/urinalysis as a variable of safety and tolerability of AZD4831 following oral administration of multiple-ascending doses at steady state in healthy Japanese and Chinese subjects.

To assess physical examination as a variable of safety and tolerability of AZD4831 following oral administration of multiple-ascending doses at steady state in healthy Japanese and Chinese subjects.

An AE is the development of an undesirable medical condition or the deterioration of a preexisting medical condition following or during exposure to a pharmaceutical product, whether or not considered causally related to the product. An undesirable medical condition can be symptoms (e.g., nausea, chest pain), signs (e.g., tachycardia, enlarged liver) or the abnormal results of an investigation (e.g., laboratory findings, ECG).

Base line Systolic blood pressure (in mmHg) will be measured at the pre-dose assessment on Day 1. Assessment in treatment period on Day 1 at 0.5, 1, 2, 3, 4, 6, 8 and 12 hours post-dose. On Day 10 at Pre-dose and 12 hours post-dose. On Day 12 at 48 hours post last dose. Measurements will be collected after the subject had rested in the supine position for at least 10 minutes.

A 12-lead ECG will be performed on Days 1, 2, 3, 6, 10 and 11: (collected at end of dECG recording) and any additional required by PI on Days 4, 5, 7 to 9 at Pre dose and at discharge on Day 12, plus any additional required by PI. A 12-lead ECG will be obtained after the subject rested in the supine position for at least 10 minutes (For time-points coinciding with dECG measurements, a paper printout of the Schiller Cardiovit CS-200 recorder\[ at the end of the 5- or 10-minute dECG recording\], will be used and the result recorded. For time-points not coinciding with dECG measurements, the ECG recording will be directly recorded in ClinBase™ using ClinBase™ Cardiosoft™).

12-lead continuous dECGs will be recorded over at least 5 minutes on Day 1, 2, 3, 6, 10, 11 \& 12. The AstraZeneca (AZ) ECG Centre will perform the digital ECG (dECG) analysis in this study, using the EClysis© system, version 3.4, or higher. At protocol-indicated time points, 12-lead continuous dECG will be recorded over at least 5 minutes with the Schiller Cardiovit CS-200 recorder (Schiller AG, Baar, Switzerland) and transmitted to the AZ central dECG repository, according to AZ ECG Centre´s standard procedures for settings, recording and transmission of dECGs. Time-points for dECG may be adjusted according to emerging PK data. All ECG recordings will be preceded by a 10-minute controlled rest period.

A 2-lead real-time telemetry ECG will be performed for at least 4 hours on Day -1 and from 30 minutes pre-dose until 24 hours post dose. The telemetry monitoring system will be reviewed by the Investigator or research nurse and paper printouts of any clinically important events will be stored as source data.

Number of clinically relevant new findings or worsening of a pre-existing findings as assessed by Haematology: Hematocrit (HCT), hemoglobin (Hb), red blood cell count (RBC), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), white blood cell count (WBC), differential blood count (neutrophils, lymphocytes, monocytes, eosinophils and basophils), reticulocytes absolute count, and platelets. Assessments will be performed during treatment period on Day 1 at pre-dose, Day 10 at pre-dose and on Day 12 at 48 hour post final dose before check-out.

A full physical examination will include the assessment of the following: general appearance, skin, cardiovascular, respiratory, abdomen, head, and neck (including ears, eyes, nose, and throat), lymph nodes, thyroid, musculoskeletal and neurological systems. A full physical examination will be performed at screening visit and at final follow-up visit (Day 24). A brief physical examination will include assessment of the following: general appearance, skin, cardiovascular system, respiratory and abdomen. A brief physical examination will performed at Day-1, treatment period (Day 1 to Day12) on Day 2: 24 h post first dose, and on Day 12: 48 h post final dose before check-out.

Base line diastolic blood pressure (in mmHg) will be measured at the pre-dose assessment on Day 1. Assessment in treatment period on Day 1 at 0.5, 1, 2, 3, 4, 6, 8 and 12 hours post-dose. On Day 10 at Pre-dose and 12 hours post-dose. On Day 12 at 48 hours post last dose. Measurements will be collected after the subject had rested in the supine position for at least 10 minutes.

Base line pulse rate (in beats per minute (bpm)) will be measured at the pre-dose assessment on Day 1. Assessment in treatment period on Day 1 at 0.5, 1, 2, 3, 4, 6, 8 and 12 hours post-dose. On Day 10 at Pre-dose and 12 hours post-dose. On Day 12 at 48 hours post last dose. Measurements will be collected after the subject had rested in the supine position for at least 10 minutes.

Oral temperature will be collected after the subject has rested in the supine position for at least 10 minutes.

Number of clinically relevant new findings or worsening of a pre-existing findings as assessed by serum biochemistry. Electrolytes: Sodium, potassium, calcium, and phosphate. Enzymes: Aspartate aminotransferase (AST), alanine aminotransferase (ALT), Alkaline phosphatase (ALP), gamma glutamyl transpeptidase (GGT), high-sensitivity C-reactive protein (hs-CRP). Substrates: Glucose (fasting), creatinine, total bilirubin, unconjugated bilirubin, conjugated bilirubin, albumin, and urea. For serum creatinine testing, blood samples will be collected on Day -1, pre-dose on Day 1, Day 5 and Day 10, follow-up (Day 14, Day 16 and Day 20) and final follow-up (Day 24)

Dipstick analysis will be performed at the centre and includes: glucose, creatinine, protein, and blood.

Microscopy (RBC, WBC and casts \[Hyaline, Granular and Cellular\]) by thermodilatometry (TDL) may be performed at additional urinalysis time points if clinically relevant abnormalities are detected (positive result for protein or blood in dipstick).

Number of clinically relevant new findings or worsening of a pre-existing findings as assessed by Immunology: Anti-neutrophil cytoplasmic antibodies (ANCA - a \& p) testing and complements (C3a, C5a \& Bb). ANCA serum testing will be performed on samples collected on Day -1, pre-dose on Day 1 and on Day 10 and at the final Follow-up Visit (Day 24). Complement testing will be performed on samples collected on Day -1, pre-dose on Day 1, Day 5 and Day 10, follow-up (Day 14, Day 16 and Day 20) and final follow-up (Day 24)