Methods: The aim of the study is to demonstrate the superiority of NICC over guideline therapy alone. The trial is designed as open-label bi-center parallel-group design with two groups. Patients will be included if they are either inpatients or if they are referred to the outpatient clinic of the hospitals by their treating physician. Randomization will be done individually with stratification by cardiovascular disease (AF, HF, TRH), center and admission type. Primary endpoints are based on the 1-year observation period after randomization. The first primary endpoint is the composite endpoint consisting of mortality, stroke and myocardial infarction. The number of hospitalizations form the second primary endpoint. The third primary endpoint is identical to the first primary endpoint plus cardiac decompensation. Adjustments for multiple testing are done using a fall back strategy. Secondary endpoints include patient adherence, health care costs, quality of life and safety. A sample size of 2930 gives 80% power at the two-sided 2.5% test-level for the first primary endpoint. The power for the second primary endpoint is 99.8% at this sample size, and it is 80% with 1086 patients.