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4 Pöyhönen M, "The effect of carbon dioxide, respiratory rate and tidal volume on human heart rate variability" 48 : 93-101, 2004
5 Williams-Russo P, "Randomized trial of hypotensive epidural anesthesia in older adults" 91 : 926-935, 1999
6 McCrae AF, "Prevention and treatment of hypotension during central neural block" 70 : 672-680, 1993
7 Brown AG, "Preoperative and postoperative oxygen saturation in the elderly following spinal or general anaesthesia--an audit of current practice" 22 : 150-154, 1994
8 Huang CJ, "Pre-operative measurement of heart rate variability predicts hypotension during general anesthesia" 50 : 542-548, 2006
9 Pagani M, "Power spectral analysis of heart rate and arterial pressure variabilities as a marker of sympatho-vagal interaction in man and conscious dog" 59 : 178-193, 1986
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