目的:观察麝香保心丸对老年急性冠脉综合征(ACS)心率变异(HRV)的影响,评价其心肌保护作用。方法:90名老年ACS患者,随机分为麝香保心丸及常规治疗组,分别于用药前、后记录24 h Holter,观察心绞痛症状及心电图变化,进行HRV分析。结果:麝...目的:观察麝香保心丸对老年急性冠脉综合征(ACS)心率变异(HRV)的影响,评价其心肌保护作用。方法:90名老年ACS患者,随机分为麝香保心丸及常规治疗组,分别于用药前、后记录24 h Holter,观察心绞痛症状及心电图变化,进行HRV分析。结果:麝香保心丸组心绞痛明显改善(P<0.05)。SDNN、SDANN、rMSSD、PNN 均升高,极低频(VLF)、低频(LF)、LF/HF均降低(P均<0.05)。结论:麝香保心丸能有效改善ACS患者心肌缺血症状及心率变异。展开更多
针对汽车门禁系统功能实现与功耗的问题,对系统车身控制模块及遥控钥匙模块的控制机制、硬件电路设计及RFID通信算法等方面进行了研究,对降低系统功耗的方法进行了归纳,提出了一种基于PIC16F1828单片机控制车身控制模块及PIC16F630控制...针对汽车门禁系统功能实现与功耗的问题,对系统车身控制模块及遥控钥匙模块的控制机制、硬件电路设计及RFID通信算法等方面进行了研究,对降低系统功耗的方法进行了归纳,提出了一种基于PIC16F1828单片机控制车身控制模块及PIC16F630控制遥控钥匙模块的汽车门禁系统,系统低频收/发电路分别采用TMS37122、TMS3705射频芯片,高、低频通信频率分别为315 MHz、134.2 k Hz,而数字调制方式则分别采用幅移键控、频移键控,系统RFID通信方式采用的是曼彻斯特编码编码。研究结果表明,该系统的遥控钥匙能实现1.5 m内控制车门的开启,并伴有设防、撤防的报警功能及语音提示功能,遥控钥匙有学习、复位功能,系统功能完善,实现了汽车门禁系统功能及功耗的优化。展开更多
Fluctuations in autonomic cardiovascular regulation during exposure to high altitude may increase the risk of heart attack during waking and sleep. This study compared heart rate variability (HVR) and its components d...Fluctuations in autonomic cardiovascular regulation during exposure to high altitude may increase the risk of heart attack during waking and sleep. This study compared heart rate variability (HVR) and its components during sleep at low altitude and after 30 - 41 hours of acclimatization at high altitude (3480 m) in five mountain marathon runners controlled for diet, drugs, light-dark cycle and jet lag. In comparison to sea level, RR-intervals during sleep at high altitude decreased significantly (P 0.001). The significant increase in sympathetic autonomic cardiovascular modulation at high altitude protects against excessive oxygen deprivation during sleep. Increases in R-R intervals can require longer periods of acclimatization at3480 m to mitigate the effects of altitude/hypoxia on sympathetic tone, thus reducing cardiovascular distress at rest during waking and sleep and probably before during and after athletic performance at altitude.展开更多
文摘目的:观察麝香保心丸对老年急性冠脉综合征(ACS)心率变异(HRV)的影响,评价其心肌保护作用。方法:90名老年ACS患者,随机分为麝香保心丸及常规治疗组,分别于用药前、后记录24 h Holter,观察心绞痛症状及心电图变化,进行HRV分析。结果:麝香保心丸组心绞痛明显改善(P<0.05)。SDNN、SDANN、rMSSD、PNN 均升高,极低频(VLF)、低频(LF)、LF/HF均降低(P均<0.05)。结论:麝香保心丸能有效改善ACS患者心肌缺血症状及心率变异。
文摘针对汽车门禁系统功能实现与功耗的问题,对系统车身控制模块及遥控钥匙模块的控制机制、硬件电路设计及RFID通信算法等方面进行了研究,对降低系统功耗的方法进行了归纳,提出了一种基于PIC16F1828单片机控制车身控制模块及PIC16F630控制遥控钥匙模块的汽车门禁系统,系统低频收/发电路分别采用TMS37122、TMS3705射频芯片,高、低频通信频率分别为315 MHz、134.2 k Hz,而数字调制方式则分别采用幅移键控、频移键控,系统RFID通信方式采用的是曼彻斯特编码编码。研究结果表明,该系统的遥控钥匙能实现1.5 m内控制车门的开启,并伴有设防、撤防的报警功能及语音提示功能,遥控钥匙有学习、复位功能,系统功能完善,实现了汽车门禁系统功能及功耗的优化。
文摘Fluctuations in autonomic cardiovascular regulation during exposure to high altitude may increase the risk of heart attack during waking and sleep. This study compared heart rate variability (HVR) and its components during sleep at low altitude and after 30 - 41 hours of acclimatization at high altitude (3480 m) in five mountain marathon runners controlled for diet, drugs, light-dark cycle and jet lag. In comparison to sea level, RR-intervals during sleep at high altitude decreased significantly (P 0.001). The significant increase in sympathetic autonomic cardiovascular modulation at high altitude protects against excessive oxygen deprivation during sleep. Increases in R-R intervals can require longer periods of acclimatization at3480 m to mitigate the effects of altitude/hypoxia on sympathetic tone, thus reducing cardiovascular distress at rest during waking and sleep and probably before during and after athletic performance at altitude.
