Case follow-up study the patients undergoing metalic heart valves replacement through phonocardiographic analysis

In this study, the synchronous pursuit of hearts sounds together with ECG signals have been realized. For this purpose pre-operative and post-operative clinical data related with the patients with heart valve diseases has been recorded through a computer. Thus, an auxiliary method has been provided to determine the patient´s health situation. Heart sounds have been obtained using a transducer insulated from its surroundings and ECG signals using surface ECG electrodes. The heart sound and ECG signals have been amplified and filtered independent of each other. After this process, these signals have been converted into digital data to be transferred to computer via I/O card. Thus, the results of heart sounds and ECG signals have been monitored and stored in the computer by software developed in Delphi Programmer Language. However, signals have been transferred in the frequency domain and a power density spectrum was drawn in order to minimize possible errors in medical diagnosis from sound signals stored in the time domain. Also, the durations of heart sound signals have been determined and the power density field has been calculated so that graphs can be compared together. The realized system has been tested with heart valve patients at the Cardiology Department in Erciyes University Gevher Nesibe Hospital