Maintenance of AV synchrony in a small child utilizing two pacemakers and the triggered VVT mode: triggered pacing in small children.
Infants and small children with atrioventricular (AV) nodal disease frequently require pacing in order to maintain an adequate heart rate. The maintenance of AV synchrony is physiologically optimal in this setting. Unfortunately, small size and congenital anomalies often preclude the placement of standard transvenous dual chamber pacing systems. We report the case of a small child with a pre-existing dual chamber epicardial pacing system and subsequent ventricular lead dysfunction who underwent implantation of a new single chamber transvenous system which was programmed in VVT (triggered) mode in order to maintain AV synchrony.
This work presents mathematical analysis, simulations and experimental results of the parallel connection of DAB converters. The gyrator technique is used to model the DAB converter and to determine a simple equivalent circuit. As the DAB converter is a natural gyrator, the paralleling can be easily done, and the control logic is simplified. A simple current sharing strategy is done by applying the same phase-shift angle between the converters. This technique can be used to connect various DAB converters in a dc microgrid system or to supply power to an isolated load. The main contribution of this study is to show converters that natural gyrator behaves, as in the case of DAB converter may be associated in parallel in a simple manner.