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| The Accuracy of Heart Rate Variability as A Predictor of Hypotension after Spina Anesthesia in Hypertensive Patients |
| The People’s Hospital of Meizhou， Meizhou 514000， China |
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Abstract Objective：To evaluate the accuracy of using heart rate variability parameters to predict the occurrence of hypotension.Hypotension is a common phenomenon in hypertensive patients with spinal anesthesia.Method：41 patients undergoing spinal anesthesia were included， heart rate variability was recorded at five different time points such as before fluid loading， after fluid loading as well as 5，15 and 30 min after spinal anesthesia.Fluid loading was performed using 5 mL/kg of a crystalloid solution.Baseline multation power and low to high frequency ratio（ LF/HF） in predicting hypotension after spinal anesthesia were analyzed by calculating the area under curves（ AUC）.Result：LF/HF ratios and total powers did not significantly change after spinal anesthesia.AUCs of LF/HF ratio for predicting moderate hypotension was 0.685 （P=0.074）， severe hypotension was 0.579（ P=0.560） .Conclusion：Heart rate variability is not a reliable predictor of hypotension after spinal block in hypertensive patients.
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