Examination of Real-Time Heart Rate Variability During Laparoscopic Cholecystectomies and Radical Surgeries

摘要

The physiologic status of patients undergoing surgical procedures requiring general anesthesia must be continuously monitored to ensure patient safety. New technologies capable of detecting even minute changes in physiologic status might be useful in providing feedback to operating room physicians as to any immediately resulting effects of their surgical interventions. The present study investigated autonomic nervous system (ANS) monitoring based on real-time Heart Rate Variability (n-HRV) as a technique for monitoring the physiologic status of patients undergoing surgery. This study analyzed ANS monitoring and hemodynamic data collected on two populations of general anesthesia patients at William Beaumont Hospital in Royal Oak, MI. The patient populations were composed of individuals undergoing laparoscopic cholecystectomies and radical surgeries. The ANS monitoring data collected included: (1) low-frequency area (LFa, in beats per minute squared), (2) high-frequency area (HFa), and (3) the ratio of low- to high- frequency areas (LFa/HFa = Ratio). The hemodynamic data collected included: (1) heart rate, (2) mean arterial pressure, (3) arterial hemoglobin oxygen saturation measured by pulse oxymetry, and (4) inspired fraction of oxygen concentration.