[Characteristics of hemodynamics during correction of cardiac arrhythmia]

In acute experiments on 25 dogs, the automatic system with computerized processing which had been developed by the authors was used to make complex studies of the central hemodynamics, pumping and contractile functions of the myocardium in the presence of complete transverse block during cardiac pacing. With increased hetero- and homeometric regulation during cardiac pacing, normotopic rhythm desynchronization and stimulation rates were found to produce a substantial effect on cardiac performance. Improved hemodynamics in pacing was attended by overload of the left chambers (by 20-60% above the normal values). It was stressed that the choice of the optimal frequency of cardiac pacing should be associated with a conservative performance regimen for the myocardium to meet the body's demands for adequate blood supply.