1. A method of treating chronic heart failure, comprising: a) carrying out the diagnostic test accompanying each patient prior to treatment and b) providing a suitable treatment to the patient in accordance with a result of concomitant diagnostic testirovaniya.2. A method according to Claim. 1, where companion diagnostic test is the classification of NYHA.3 cardiac function. A method according to Claim. 1, where companion diagnostic test is a test of plasma levels of NT-proBNP or BNP.4. A method according to Claim. 1 where appropriate treatment includes treatment neyregulinom.5. The method claim 4, wherein the suitable treatment, further comprising the treatment of heart failure by using one or more drugs of heart failure selected from the group consisting of: a. Angiotensin-converting enzyme inhibitors, β-blockers, angiotensin II receptors, diuretics and digitalis .6. A method according to claim. 2, wherein the suitable treatment is applied in the case where the cardiac function is a Class II or III of NYHA.7. A method according to claim. 3, wherein the suitable treatment is applied when the plasma level of NT-proBNP is ≤4000 fmol / ml.8. A method according to claim. 4 or 5, wherein neuregulin is neuregulin-1.9. A method according to claim. 4 or 5, wherein the protein consists of a neuregulin EGF-like domain of neuregulin-1.10. A method according to claim 4 or 5, wherein neuregulin protein consists of SEQ ID NO:. 1.11. Use of neuregulin for the preparation of medicaments for the treatment of patients with chronic heart failure, where the patients have plasma level of NT-proBNP ≤4000 fmol / ml before lecheniya.12. -Application1. Способ лечения хронической сердечной недостаточности, включающий:a) проведение сопутствующего диагностического тестирования каждого пациента перед началом лечения иb) предоставление подходящего лечения пациенту в соответствии с результатом сопутствующего диагностического тестирования.2. Способ по п. 1, где сопутствующий диагностический тест
