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THE PRESENCE of complete heart block offers a good opportunity to study cardiovascular functions, since one of the major variables of cardiac activity, i.e., heart rate, is maintained constant.113 In addition, if a cardiac pacemaker is implanted in a heart for treatment of complete heart block,14-20 total control of the cardiac rate is achieved, thereby providing an excellent opportunity for studying cardiovascular hemodvnamics under a variety of fixed rates. The present study was unidertakendoi:10.1161/01.cir.28.4.510 pmid:14068759 fatcat:za4pnlgazbcqnmqj4hfxiu5c6m