PC tabanlı kalp atış hızı değişkenliği ve solunum kayıt sistemi tasarımı ve gerçekleştirilmesi

Determination of the exact effects of respiration rate on the heart rate variabilityrequires comprehensive experimental studies. In this context, these two quanti-ties should be analyzed simultaneously. In this thesis, design and implementationof a new PC-based heart rate variability recording system with respiration is de-scribed. The respiration rate is detected by a thermocouple placed in a nasaltube, whereas a single-channel electrocardiogram (ECG) signal is recorded forheart rate variability analysis in the system. The PC-based data acquisitionpart, which was designed in compliance to patient safety standards, has a Uni-versal Serial Bus (USB) interface. The speed of data acquisition and patientcomfort during recording make the system advantageous. The HRVs of differentpatients in both spontaneous and controlled breathing conditions were analyzedafter short-term recordings with the system. Differences were observed in bothits time-domain parameters and power spectral components.Keywords: Heart Rate Variability, Respiration, Data Acquisition, USB.iii