This investigation was to evaluate the driving fatigue based on power spectral analysis of heart rate variability (HRV) under vertical vibration. Forty healthy male subjects (29.7±3.5 years) were randomly divided...This investigation was to evaluate the driving fatigue based on power spectral analysis of heart rate variability (HRV) under vertical vibration. Forty healthy male subjects (29.7±3.5 years) were randomly divided into two groups, Group A (28.8±4.3 years) and Group B (30.6±2.7 years). Group A (experiment group) was required to perform the simulated driving and Group B (control group) kept calm for 90 min. The frequency domain indices of HRV such as low frequency (0.04 0.15 Hz, LF), high frequency (0.150.4 Hz, HF), LF/HF together with the indices of hemodynamics such as blood pressure (BP) and heart rate (HR) of the subjects between both groups were calculated and analyzed after the simulated driving. There were significances of the former indices between both groups (P<0.05). All the data collected after experiment of Group A was observed the remarkable linear correlation (P<0.05) and parameters and errors of their linear regression equation were stated (α=0.05, P<0.001) in this paper, respectively. The present study investigated that sympathetic activity of the subjects enhanced after the simulated driving while parasympathetic activities decreased. The sympathovagal balance was also improved. As autonomic function indictors of HRV reflected fatigue level, quantitative evaluation of driving mental fatigue from physiological reaction could be possible.展开更多
The present study was designed to make certain whether there exists adrenomedullin (ADM) in the rat central nervous system and evaluated the hemodynamic actions of intracerebroventricular administration (ICVA) of hum...The present study was designed to make certain whether there exists adrenomedullin (ADM) in the rat central nervous system and evaluated the hemodynamic actions of intracerebroventricular administration (ICVA) of human ADM[13-52]. By immunohistochemistry (ABC method),We found that there was a discrete localization of ADM-positive immunoreactivity in the rat central system including cerebral cortex,paraventricular tissues, hypothalamus, cerebella cortex, mesencephalon and medulla oblongata. By reverse transcription-polymerase chain reaction(RT-PCR) analysis, rat ADM mRNA was found to be expressed in rat brain. These above results of immunohistochemistry and RT-PCR suggest that ADM exists in the rat brain. We also found that centrally administered ADM[13-52]in a dose of 0.4 to 3. 2 nmol/kg provoked marked, prolonged and dosedependent increases in mean arterial blood pressure (MABP) and heart rate (HR). To clarify the mechanisms of the hemodynamic changes induced by centrally administered ADM [13-52]. the effect of centrally administered ADM [13-52] on renal sympathetic nerve activity (RSNA) was studied. The result showed that centrally administered ADM [13-52] ( 1. 6 nmol/kg) provoked a marked increase in RSNA .therefore .the increases in MABP and HR induced by centrally administered ADM [13-52]might be due to the stimulation of central sympathetic mechanism. In addtion,we also compared the relationship of activity and structure among the different fragments of ADM. In conclusion, ADMexists in the rat brain, and it may play an important role in the central control of cardiovascular system.展开更多
Objective: to evaluate cilazapril in vasovagal syncope treatment. Method: eighty\|six cases of VVS patients found positive in TTT tilt were medicated with 2.5 mg cilazapril daily for three months and followed up by TT...Objective: to evaluate cilazapril in vasovagal syncope treatment. Method: eighty\|six cases of VVS patients found positive in TTT tilt were medicated with 2.5 mg cilazapril daily for three months and followed up by TTT. Results: seven cases quit due to cough or unexplained reason; 79 VVS patients had no more fainting spells; 75.95% of TTT results of patients changed to negative after 3 months therapy. The before and after cilazapril treatment average blood pressures (taken in lying position) were 121/73 mm Hg (1 mm Hg= 0.133kPa) and 120/76 mm Hg respectively ( P > 0.05); and mean heart rates were 68.63±12.37/min and 70.13±13.15/min respectively with no significant changes ( P > 0.05). Conclusion: Cilazapril was effective in treatment of VVS; did not affect normal blood pressure and heart rate; was safe; and had little side effect.展开更多
Objective: To introduce a method to calculate cardiovascular age, a new, accurate and much simpler index for assessing cardiovascular autonomic regulatory function, based on statistical analysis of heart rate and bloo...Objective: To introduce a method to calculate cardiovascular age, a new, accurate and much simpler index for assessing cardiovascular autonomic regulatory function, based on statistical analysis of heart rate and blood pressure variability (HRV and BPV) and baroreflex sensitivity (BRS) data. Methods: Firstly, HRV and BPV of 89 healthy aviation personnel were analyzed by the conventional autoregressive (AR) spectral analysis and their spontaneous BRS was obtained by the sequence method. Secondly, principal component analysis was conducted over original and derived indices of HRV, BPV and BRS data and the relevant principal components, PCi orig and PCi deri (i=1, 2, 3,...) were obtained. Finally, the equation for calculating cardiovascular age was obtained by multiple regression with the chronological age being assigned as the dependent variable and the principal components significantly related to age as the regressors. Results: The first four principal components of original indices accounted for over 90% of total variance of the indices, so did the first three principal components of derived indices. So, these seven principal components could reflect the information of cardiovascular autonomic regulation which was embodied in the 17 indices of HRV, BPV and BRS exactly with a minimal loss of information. Of the seven principal components, PC2 orig , PC4 orig and PC2 deri were negatively correlated with the chronological age ( P <0 05), whereas the PC3 orig was positively correlated with the chronological age ( P <0 01). The cardiovascular age thus calculated from the regression equation was significantly correlated with the chronological age among the 89 aviation personnel ( r =0.73, P <0 01). Conclusion: The cardiovascular age calculated based on a multi variate analysis of HRV, BPV and BRS could be regarded as a comprehensive indicator reflecting the age dependency of autonomic regulation of cardiovascular system in healthy aviation personnel.展开更多
Objective： To retrospectively study the effects of epinephrine on blood pressure, heart rate as well as renal function in the patients with severe acute pancreatitis complicated with septic shock. Methods： Twenty-fi...Objective： To retrospectively study the effects of epinephrine on blood pressure, heart rate as well as renal function in the patients with severe acute pancreatitis complicated with septic shock. Methods： Twenty-five patients with severe acute pancreatitis complicated with septic shock were divided into 3 groups according to the biggest infusing rate of epinephrine used, with the infusing rate of 0.01-0.05, 0.06-0.10, 〉0.10 μg/kg·min in group A （n=9）, B （n=8） and C （n=8）, respectively. Mean arterial blood pressure （MAP）, heart rate （HR）, urine output, blood urea nitrogen （BUN）, creatinine （CRE）, urine albumin （U-ALB） and urine β2-microglubulin （Uβ2-MG） as well as APACHE Ⅲ scoring were recorded in all the patients. Results： Before anti-shock therapy was given, hypotension, tachycardia, oliguria as well as the abnormal levels of CRE, BUN, U-ALB, Uβ2-MG and APACHE Ⅲ scoring occurred in all the 25 patients. With anti-shock therapy, MAP, HR, urine output and BUN, CRE in the patients from the 3 groups gradually returned to normal （P〈0.01 vs before anti-shock therapy）, and U-ALB, Uβ2-MG output and APACHE Ⅲ scoring also restored but still remained abnormal （P〈0.01 vs before anti-shock therapy）. Conclusion： The first goal to treat the patients with severe acute pancreatitis complicated with septic shock should be restoring the organ blood supply. Based on volume resuscitation, epinephrine and other vasoactive drugs could be combined to maintain circulatory stability and also could benefit the restoration of the renal function.展开更多
Background： AH （Arterial hypertension） due to the extremely high incidence is the most important risk factor for development of myocardial infarctions, strokes and lethal outcomes. It is very important to identify...Background： AH （Arterial hypertension） due to the extremely high incidence is the most important risk factor for development of myocardial infarctions, strokes and lethal outcomes. It is very important to identify a group of patients with increased risk of adverse outcomes to modify treatment and prevention. Significant assistance in resolving this problem is to provide a method of HM （Holter monitoring） which allows estimating the HRV （heart rate variability） and HRT （heart rate turbulence） parameters that are independent risk predictors of sudden cardiac death. The aim of our study was to assess HRV and HRT parameters in patients with AH of the II degree. Materials and methods： We have studied parameters of HRV and HRT in 214 patients with AH of the II-nd degree aged 35 to 70 （57.7 ± 7.6） years： 121 women （56.5%） and 93 men （43.5%）. All patients underwent electrocardiography and echocardiography. Statistical analysis of the results has been made using the analytical package Statistics 10.0. Results： The parameters of HRV and HRT in patients with AH of the II degree were studied. Statistically significant correlations of the HRV parameters with the age of patients, average HR, circadian index, and EF （ejection fraction） were revealed. Statistically significant correlations of the HRT parameters with the LVMI （left ventricular mass index）, EF, HR average were received. High level of the statistical significance of the interrelation of HRT parameters （TO and TS） has been revealed. Conclusions： The received results can be used during the selection of the group of patients with AH having high risk for unfavorable outcomes. Taking into account the features of the HRV and turbulence parameters and factors associated with them this will enable the individualization of the assessment of the risk in AH as much as possible and prescription of adequate treatment for each patient.展开更多
There are differences in individual cardiovascular responses to the administration of dexmedetomidine,a highly selective α2A-adrenergic receptor(ADRA2A) agonist.The aim of this study was to investigate ADRA2A gene po...There are differences in individual cardiovascular responses to the administration of dexmedetomidine,a highly selective α2A-adrenergic receptor(ADRA2A) agonist.The aim of this study was to investigate ADRA2A gene polymorphisms in the Chinese Han population and their association with the cardiovascular response to intravenous dexmedetomidine infusion.Sixty elective surgery patients of Chinese Han nationality were administered 1 μg/kg dexmedetomidine intravenously over 10 min as a premedication.ADRA2A C-1291G and A1780G polymorphism status was determined in these patients,and their relationships to changes in blood pressure and heart rate after dexmedetomidine administration were analyzed.There were neither significant differences in systolic or diastolic blood pressure changes in individuals with different A1780G and C-1291G genotypes after dexmedetomidine administration,nor in heart rates among the different A1780G genotypes.However,there were significant differences in changes in heart rates in patients with different C-1291G genotypes.There were no significant differences in the sedative effects of dexmedetomidine among different A1780G and C-1291G genotypes.Logistic regression revealed that the C-1291G polymorphism was associated with differential decreases in heart rate after intravenous infusion of dexmedetomidine.These findings indicate that the ADRA2A C-1291G polymorphism can affect heart rate changes in patients after in-utravenous infusion of dexmedetomidine.展开更多
文摘This investigation was to evaluate the driving fatigue based on power spectral analysis of heart rate variability (HRV) under vertical vibration. Forty healthy male subjects (29.7±3.5 years) were randomly divided into two groups, Group A (28.8±4.3 years) and Group B (30.6±2.7 years). Group A (experiment group) was required to perform the simulated driving and Group B (control group) kept calm for 90 min. The frequency domain indices of HRV such as low frequency (0.04 0.15 Hz, LF), high frequency (0.150.4 Hz, HF), LF/HF together with the indices of hemodynamics such as blood pressure (BP) and heart rate (HR) of the subjects between both groups were calculated and analyzed after the simulated driving. There were significances of the former indices between both groups (P<0.05). All the data collected after experiment of Group A was observed the remarkable linear correlation (P<0.05) and parameters and errors of their linear regression equation were stated (α=0.05, P<0.001) in this paper, respectively. The present study investigated that sympathetic activity of the subjects enhanced after the simulated driving while parasympathetic activities decreased. The sympathovagal balance was also improved. As autonomic function indictors of HRV reflected fatigue level, quantitative evaluation of driving mental fatigue from physiological reaction could be possible.
文摘The present study was designed to make certain whether there exists adrenomedullin (ADM) in the rat central nervous system and evaluated the hemodynamic actions of intracerebroventricular administration (ICVA) of human ADM[13-52]. By immunohistochemistry (ABC method),We found that there was a discrete localization of ADM-positive immunoreactivity in the rat central system including cerebral cortex,paraventricular tissues, hypothalamus, cerebella cortex, mesencephalon and medulla oblongata. By reverse transcription-polymerase chain reaction(RT-PCR) analysis, rat ADM mRNA was found to be expressed in rat brain. These above results of immunohistochemistry and RT-PCR suggest that ADM exists in the rat brain. We also found that centrally administered ADM[13-52]in a dose of 0.4 to 3. 2 nmol/kg provoked marked, prolonged and dosedependent increases in mean arterial blood pressure (MABP) and heart rate (HR). To clarify the mechanisms of the hemodynamic changes induced by centrally administered ADM [13-52]. the effect of centrally administered ADM [13-52] on renal sympathetic nerve activity (RSNA) was studied. The result showed that centrally administered ADM [13-52] ( 1. 6 nmol/kg) provoked a marked increase in RSNA .therefore .the increases in MABP and HR induced by centrally administered ADM [13-52]might be due to the stimulation of central sympathetic mechanism. In addtion,we also compared the relationship of activity and structure among the different fragments of ADM. In conclusion, ADMexists in the rat brain, and it may play an important role in the central control of cardiovascular system.
文摘Objective: to evaluate cilazapril in vasovagal syncope treatment. Method: eighty\|six cases of VVS patients found positive in TTT tilt were medicated with 2.5 mg cilazapril daily for three months and followed up by TTT. Results: seven cases quit due to cough or unexplained reason; 79 VVS patients had no more fainting spells; 75.95% of TTT results of patients changed to negative after 3 months therapy. The before and after cilazapril treatment average blood pressures (taken in lying position) were 121/73 mm Hg (1 mm Hg= 0.133kPa) and 120/76 mm Hg respectively ( P > 0.05); and mean heart rates were 68.63±12.37/min and 70.13±13.15/min respectively with no significant changes ( P > 0.05). Conclusion: Cilazapril was effective in treatment of VVS; did not affect normal blood pressure and heart rate; was safe; and had little side effect.
文摘Objective: To introduce a method to calculate cardiovascular age, a new, accurate and much simpler index for assessing cardiovascular autonomic regulatory function, based on statistical analysis of heart rate and blood pressure variability (HRV and BPV) and baroreflex sensitivity (BRS) data. Methods: Firstly, HRV and BPV of 89 healthy aviation personnel were analyzed by the conventional autoregressive (AR) spectral analysis and their spontaneous BRS was obtained by the sequence method. Secondly, principal component analysis was conducted over original and derived indices of HRV, BPV and BRS data and the relevant principal components, PCi orig and PCi deri (i=1, 2, 3,...) were obtained. Finally, the equation for calculating cardiovascular age was obtained by multiple regression with the chronological age being assigned as the dependent variable and the principal components significantly related to age as the regressors. Results: The first four principal components of original indices accounted for over 90% of total variance of the indices, so did the first three principal components of derived indices. So, these seven principal components could reflect the information of cardiovascular autonomic regulation which was embodied in the 17 indices of HRV, BPV and BRS exactly with a minimal loss of information. Of the seven principal components, PC2 orig , PC4 orig and PC2 deri were negatively correlated with the chronological age ( P <0 05), whereas the PC3 orig was positively correlated with the chronological age ( P <0 01). The cardiovascular age thus calculated from the regression equation was significantly correlated with the chronological age among the 89 aviation personnel ( r =0.73, P <0 01). Conclusion: The cardiovascular age calculated based on a multi variate analysis of HRV, BPV and BRS could be regarded as a comprehensive indicator reflecting the age dependency of autonomic regulation of cardiovascular system in healthy aviation personnel.
基金Supported by the National Natural Science Fundation of China(No. 30471675)the Topic of Tackle Key Problems in Science and Technology of Shaanxi Province(No. 2004K17G15).
文摘Objective： To retrospectively study the effects of epinephrine on blood pressure, heart rate as well as renal function in the patients with severe acute pancreatitis complicated with septic shock. Methods： Twenty-five patients with severe acute pancreatitis complicated with septic shock were divided into 3 groups according to the biggest infusing rate of epinephrine used, with the infusing rate of 0.01-0.05, 0.06-0.10, 〉0.10 μg/kg·min in group A （n=9）, B （n=8） and C （n=8）, respectively. Mean arterial blood pressure （MAP）, heart rate （HR）, urine output, blood urea nitrogen （BUN）, creatinine （CRE）, urine albumin （U-ALB） and urine β2-microglubulin （Uβ2-MG） as well as APACHE Ⅲ scoring were recorded in all the patients. Results： Before anti-shock therapy was given, hypotension, tachycardia, oliguria as well as the abnormal levels of CRE, BUN, U-ALB, Uβ2-MG and APACHE Ⅲ scoring occurred in all the 25 patients. With anti-shock therapy, MAP, HR, urine output and BUN, CRE in the patients from the 3 groups gradually returned to normal （P〈0.01 vs before anti-shock therapy）, and U-ALB, Uβ2-MG output and APACHE Ⅲ scoring also restored but still remained abnormal （P〈0.01 vs before anti-shock therapy）. Conclusion： The first goal to treat the patients with severe acute pancreatitis complicated with septic shock should be restoring the organ blood supply. Based on volume resuscitation, epinephrine and other vasoactive drugs could be combined to maintain circulatory stability and also could benefit the restoration of the renal function.
文摘Background： AH （Arterial hypertension） due to the extremely high incidence is the most important risk factor for development of myocardial infarctions, strokes and lethal outcomes. It is very important to identify a group of patients with increased risk of adverse outcomes to modify treatment and prevention. Significant assistance in resolving this problem is to provide a method of HM （Holter monitoring） which allows estimating the HRV （heart rate variability） and HRT （heart rate turbulence） parameters that are independent risk predictors of sudden cardiac death. The aim of our study was to assess HRV and HRT parameters in patients with AH of the II degree. Materials and methods： We have studied parameters of HRV and HRT in 214 patients with AH of the II-nd degree aged 35 to 70 （57.7 ± 7.6） years： 121 women （56.5%） and 93 men （43.5%）. All patients underwent electrocardiography and echocardiography. Statistical analysis of the results has been made using the analytical package Statistics 10.0. Results： The parameters of HRV and HRT in patients with AH of the II degree were studied. Statistically significant correlations of the HRV parameters with the age of patients, average HR, circadian index, and EF （ejection fraction） were revealed. Statistically significant correlations of the HRT parameters with the LVMI （left ventricular mass index）, EF, HR average were received. High level of the statistical significance of the interrelation of HRT parameters （TO and TS） has been revealed. Conclusions： The received results can be used during the selection of the group of patients with AH having high risk for unfavorable outcomes. Taking into account the features of the HRV and turbulence parameters and factors associated with them this will enable the individualization of the assessment of the risk in AH as much as possible and prescription of adequate treatment for each patient.
文摘There are differences in individual cardiovascular responses to the administration of dexmedetomidine,a highly selective α2A-adrenergic receptor(ADRA2A) agonist.The aim of this study was to investigate ADRA2A gene polymorphisms in the Chinese Han population and their association with the cardiovascular response to intravenous dexmedetomidine infusion.Sixty elective surgery patients of Chinese Han nationality were administered 1 μg/kg dexmedetomidine intravenously over 10 min as a premedication.ADRA2A C-1291G and A1780G polymorphism status was determined in these patients,and their relationships to changes in blood pressure and heart rate after dexmedetomidine administration were analyzed.There were neither significant differences in systolic or diastolic blood pressure changes in individuals with different A1780G and C-1291G genotypes after dexmedetomidine administration,nor in heart rates among the different A1780G genotypes.However,there were significant differences in changes in heart rates in patients with different C-1291G genotypes.There were no significant differences in the sedative effects of dexmedetomidine among different A1780G and C-1291G genotypes.Logistic regression revealed that the C-1291G polymorphism was associated with differential decreases in heart rate after intravenous infusion of dexmedetomidine.These findings indicate that the ADRA2A C-1291G polymorphism can affect heart rate changes in patients after in-utravenous infusion of dexmedetomidine.
