Ş. Okkesim, M.H. Asyali, S. Kara, M.G. Kaya, and İ. Ardiç (Turkey)
Biomedical Signal Processing, Heart Rate Variability,Coronary Angiography and Anxiety.
Research on Heart Rate Variability (HRV) indicates that power in different frequency bands of HRV is instrumental in evaluating sympathetic and parasympathetic balance. The main goal of this study is to investigate whether variation of stress due to coronary angiography can be successfully assessed using HRV power spectrum analysis. Electrocardiography (ECG) signals of 8 patients (age 39 to 80 years, mean 57.9) who underwent coronary angiography operation at the Cardiology Center of Erciyes University (Kayseri, Turkey) were obtained. All patients were administered 5 mg of Diazepam Recordings were done at three stages: one hour before, during, and one hour after the angiography. The ratio LF/HF represents the ratio of the sympathetic to parasympathetic influence on the heart. Our hypothesis is that increased stress will lead to an increase in sympathetic nervous activity and hence an increase in this ratio. The results indicate that sympathetic nervous system (SNS) is suppressed during the coronary angiography operation. The possible reason of this could be the administration of Diazepam medicine. We must record ECG signals from a control group which were not administered Diazepam to quantitatively assess changes in the emotional state of subjects undergoing critical operations.
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