This work proposes to design a fuzzy proportional-integral derivative (FPID) controller for dual-sensor cardiac pacemaker systems, which can automatically control the heart rate to accurately track a desired preset pr...This work proposes to design a fuzzy proportional-integral derivative (FPID) controller for dual-sensor cardiac pacemaker systems, which can automatically control the heart rate to accurately track a desired preset profile. The combination of fuzzy logic and conventional PID control approaches is adopted for the controller design based on dual-sensors. This controller offers good adaptation of the heart rate to the physiological needs of the patient under different states (rest and walk). Through comparing with the conventional fuzzy control algorithm, FPID provides a more suitable control strategy to determine a pacing rate in order to achieve a closer match between actual heart rate and a desired profile. To assist the heartbeat recovery, the stimuli with adjustable pacing rate is generated by the pacemaker according to the FPID controller, such actual heart rate may track the preset heart rate faithfully. Simulation results confirm that this proposed control design is effective for heartbeat recovery and maintenance. This study will be helpful not only for the analysis and treatment of bradycardias but also for improving the performance of medical devices.展开更多
目的:观察频率适应性心室起搏时患者的运动耐量和血液动力学变化,并与固定频率心室起搏相比较。方法:对19例心动过缓患者植入了体动感知频率适应性起搏器。术后随机依次程控为固定频率心室起搏和频率适应性心室起搏方式,分别进行踏车运...目的:观察频率适应性心室起搏时患者的运动耐量和血液动力学变化,并与固定频率心室起搏相比较。方法:对19例心动过缓患者植入了体动感知频率适应性起搏器。术后随机依次程控为固定频率心室起搏和频率适应性心室起搏方式,分别进行踏车运动试验,超声心动图测量运动前后的每搏量、心排出量,心电图记录心率变化。结果:频率适应性心室起搏时,运动时最快起搏心率达117±23 bpm,其运动时间明显长于固定频率心室起搏时(437±45 s 比323±51s.P<0.01)。尽管两种起搏方式的运动心排出量均明显增加,但频率适应性心室起搏的运动最大心排出量较固定频率心室起搏增加36%(P<0.05)。与运动前相比,固定频率心室起搏的运动每搏量增加51%,而频率适应性心室起搏的每搏量则无明显改变(P>0.05).结论:频率适应性心室起搏可明显改善心动过缓患者的运动耐量和心排出量,其主要机制是增快了运动时的起搏频率。展开更多
文摘This work proposes to design a fuzzy proportional-integral derivative (FPID) controller for dual-sensor cardiac pacemaker systems, which can automatically control the heart rate to accurately track a desired preset profile. The combination of fuzzy logic and conventional PID control approaches is adopted for the controller design based on dual-sensors. This controller offers good adaptation of the heart rate to the physiological needs of the patient under different states (rest and walk). Through comparing with the conventional fuzzy control algorithm, FPID provides a more suitable control strategy to determine a pacing rate in order to achieve a closer match between actual heart rate and a desired profile. To assist the heartbeat recovery, the stimuli with adjustable pacing rate is generated by the pacemaker according to the FPID controller, such actual heart rate may track the preset heart rate faithfully. Simulation results confirm that this proposed control design is effective for heartbeat recovery and maintenance. This study will be helpful not only for the analysis and treatment of bradycardias but also for improving the performance of medical devices.
文摘目的:观察频率适应性心室起搏时患者的运动耐量和血液动力学变化,并与固定频率心室起搏相比较。方法:对19例心动过缓患者植入了体动感知频率适应性起搏器。术后随机依次程控为固定频率心室起搏和频率适应性心室起搏方式,分别进行踏车运动试验,超声心动图测量运动前后的每搏量、心排出量,心电图记录心率变化。结果:频率适应性心室起搏时,运动时最快起搏心率达117±23 bpm,其运动时间明显长于固定频率心室起搏时(437±45 s 比323±51s.P<0.01)。尽管两种起搏方式的运动心排出量均明显增加,但频率适应性心室起搏的运动最大心排出量较固定频率心室起搏增加36%(P<0.05)。与运动前相比,固定频率心室起搏的运动每搏量增加51%,而频率适应性心室起搏的每搏量则无明显改变(P>0.05).结论:频率适应性心室起搏可明显改善心动过缓患者的运动耐量和心排出量,其主要机制是增快了运动时的起搏频率。
