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Presents a distributed component-oriented multi-tier architecture as applied to the multifunctional ECG software system development. This approach makes it possible to design flexible and manageable ECG applications with the functionality that can be dynamically changed or extended. As a practical implementation of the elaborated architecture a realtime ECG system was developed and its performance parameters were investigated. A set of implemented components includes several real-time data acquisition modules, fast visualization and printing components as well as noise suppression and QRS detection and survey modules. The modular structure of the application with support of transparent integration of new components enabled us to develop additional add-on modules for carrying out specific experiments with ECG transmission methods.