Changes in Heart Rate Variability in Elderly Patients Undergoing Major Noncardiac Surgery Under Spinal or General Anesthesia
Minna Bäcklund, Lauri Toivonen, Marjata Tuominen, Pertti Pere, Leena Lindgren
Regional Anesthesia & Pain Medicine Sep 1999, 24 (5) 386-392; DOI: 10.1136/rapm-00115550-199924050-00003