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There is considerable evidence that impaired autonomic control may be associated with the etiology of coronary artery disease (CAD). We hypothesized that the autonomic imbalance as assessed by measuring heart rate variability (HRV) and biological parameters before and after coronary angiography (CAG) may predict the presence of CAD.

journal of clinical medicine research

The Ratio of Low-Frequency to High-Frequency in Ambulatory Electrocardiographic Monitoring Immediately Before Coronary Angiography as a Predictor of the Presence of Coronary Artery Disease