Prognostic significance of heart rate variability in centenarians

We studied the significance for further survival of heart rate variability and other variables in the very elderly. In 1992, we assessed activities of daily living, cognitive function, and nutritional status in 27 centenarians with no disease, in addition to the power of the heart rate variability in the ultralow, very low, low (LF), and high frequency (HF) bands. In 1996, we assessed survival in these centenarians; 17 had died and 10 were still living. Logistic regression analysis using backward elimination detected three factors, dementia, LF/HF, and age, that independently influenced mortality. Mortality risk increased with greater age in 1992, more severe dementia, or lower LF/HF. Sympathetic nerve activity, represented as LF/HF, may be associated with prognosis for survival in centenarians.     

冠心病患者心率变异性检测的临床意义

通过频域分析法，分析６５例冠心病患者的心率变异性（ＨＲＶ），发现其昼夜规律消失；心梗塞组的ＨＲＶ较心绞痛组降低。提示：ＨＲＶ分析可定量检测心脏自主神经系统活性，可以在一定程度上反映心功能受损程度，对临床治疗有一定的参考价值。     

老年冠心病心率变异的临床意义

目的检测老年人(≥60岁)冠心病(心肌梗死、心绞痛)患者心率变异(HRV)及探讨其临床意义。方法本研究对老年冠心病组(72例)与正常组(26例)的5min心电信号进行HRV对照研究,观察下列指标,总体标准差(SDANN),均值标准差(SDNN)标准差均值(SDNNindex)差值均分的平方根(rMSSD),以及差值>50ms的百分比(PPN50%),并检测5min平均心率(HR)、最大HR和最小HR。结果老年冠心病组HRV各项指标均数较正常组显著降低,冠心病组与正常组5minHR比较,前者最小HR明显增快,最大HR与平均HR则无明显差异。结论老年冠心病(心肌梗死、心绞痛)心肌缺血,心脏自主神经损害,迷走神经功能受损,HRV降低,临床应用β受体阻滞剂可维持植物神经功能平衡状态,改善老年冠心病预后颇有价值。     

急性心肌梗死后心率变异性的特点及其临床意义

目的　探讨急性心肌梗死 ( AMI)早期心率变异性 ( HRV)特点及其临床意义。方法　 AMI病人 5 2例入院 48小时内进行 2 4小时动态心电图检查 ,应用计算机软件进行 HRV的时域分析 ,并观察 HRV与心脏事件的关系。结果　所有 AMI患者的 HRV时域值均较正常对照组 32例明显降低 ( P<0 .0 1) ,发生心脏事件组的 HRV时域值更进一步降低。结论　早期检测 AMI后的 HRV指标可预测心脏事件的发生。     

老年慢性阻塞性肺病患者窦性心率震荡及心率变异性的研究

目的 探讨慢性阻塞性肺病(COPD)患者窦性心率震荡(HRT)及心率变异性(HRV)变化及临床意义.方法 临床诊断为COPD老年患者59例,选择同期健康老年人30例为对照组.24 h动态心电图检测各组HRT参数:震荡初始(TO)和震荡斜率(TS)及HRV各项指标,肺功能检测,同时超声心动图测量左心室射血分数(LVEF)、右心房内径(RAD)、右心室内径(RVD)、右心室壁厚度(RVWT)等指标;组间比较且对HRT与HRV指标进行相关性分析.结果 与对照组比较,COPD患者TO值显著增高[(-0.2±1.1)%与(-3.8±2.8)%,t=6.830,P＜0.01],TS值显著下降[(7.0±3.6)与(11.7±6.1)ms/RR,t=3.866,P＜0.01];HRV指标正常R-R间期的标准差(SDNN)、正常R-R间期的标准差的平均值(SDNNI)、SDNNI的标准差(SDANN)、相邻R-R间期之差的均方根值(rMSSD)和正常R-R间期标准差≥50 ms的百分数(PNN50)增加,且随肺动脉压力的增高而恶化.TO与SDANN,rMSDD呈负相关(r=-0.369,P＜0.05;r=-0.472,P＜0.01),TS和SDNN,SDANN,PNN50呈正相关(P＜0.05),与rMSDD无相关性(P＞0.05).结论 COPD患者HRT现象减弱,HRT和HRV变化随患者肺动脉压力的增加而恶化,联合检测对评价COPD患者自主神经功能状态及预后有较高临床价值.

Abstract：

Objective To explore the clinical significance of sinus heart rate turbulence (HRT)and heart rate variability (HRV) in patients with chronic obstructive pulmonary disease(COPD).Methods The 59 moderate to severe COPD patients and 30 healthy subjects were enrolled in this study. The 24-hour holter monitor was used to screen the HRT onset (TO), turbulence slope (TS)and HRV. Pulmonary function tests and echocardiographic examination were performed for measuring left ventricular ejection fraction (LVEF), right atrial dimension (RAD), right ventricular dimension (RVD), right ventricular wall thickness (RVWT). Then all the parameters were compared between NC group and COPD group, and the relationship between HRT and HRV was investigated. Results Compared with control group, TO was significantly increased [(-0.2±1.1) % vs.(-3.8±2.8) %, t=6. 830,P＜0.01] and TS was decreased [(7.0±3.6) ms/RR vs. (11.7±6.1) ms/RR, t =3. 866, P＜0.01] in COPD group. In time domain HRV parameters, normal RR intervallerinin standart deviation(SDNN), standard deviation of normal-to-normal beats index (SDNNi), standard deviation of the averages of normal sinus to normal sinus (SDANN), mean squared differences of the successive RR intervals (rMSDD), fraction of consecutive normal sinus intervals that differ by more than 50 ms (PNN50) were significantly lower in COPD group than in control group(P＜0. 05). TO was negatively correlated with SDANN and rMSDD (r=-0. 369, P＜0. 05; r=-0.472, P＜0.01).TS was positively correlated with SDNN, SDANN and PNN50 (all P＜0.05), but had no correlation with rMSDD (P＞0. 05). Conclusions HRT and HRV are dramatically blunted in COPD patients.Combination of HRV and prognosis. and HRT may be simple and elegant ways for evaluating cardiac autonomic functions.     

扩张性心肌病患儿心率变异性的预后意义

目的探讨扩张性心肌病(DCM)患儿心率变异性(HRV)变化的预后意义。方法收集42例扩张性心肌病患儿,分成A组心功能Ⅰ～Ⅱ级(NYHA分级,n=20)和B组心功能Ⅲ～Ⅳ级(n=22),以及健康儿童对照组(n=20);采用Mars3000动态心电图仪常规记录24h动态心电图,分析HRV时域参数(SDNN、SDANN、PNN50和rMSSD)和频域参数(TF、VLF、LF、HF、LF/HF)。结果(1)DCM患儿(A组与B组)与对照组比较,各参数差异均有统计学意义(P<0.01);(2)DCM患儿共死亡16例,存活26例,死亡组与存活组各参数比较,t检验有统计学意义。结论HRV可作为评估DCM患儿病情程度的指标,并可作为预后的预测因子。     

原发性高血压心率变异性测定的意义

目的：探讨原发性高血压患不同时期心率变异性的改变。方法：记录原发性高血压病人46例,对照组23例的24小时动态心电图,进行心率变异性的时域分析。结果：（1）原发性高血压组时域分析的各项参数指标除PNN50外,SDNN、SDANN、SDANNindex,rMSSD显减低（P＜0．01）;（2）随高血压病程进展（1、2、3级）SDNN、SDANN、SDANNindex逐渐降低,各项之间均存在极显的差异。结论：原发性高血压患的HRV显减低,且随病程进展,变化愈显,提示HRV分析对高血压患有分层及预后的价值。     

冠心病患者心率变异性分析及临床意义

目的探讨冠心病患者心率变异性变化及临床意义。方法冠心病组102例,对照组(无冠心病的健康人80例),通过动态心电图检查分别测定时域指标(SDNN、SDANN、RMSSD、PNN50)和频域指标(TP、LF、HF),进行心率变异性变化的参数分析。结果冠心病组的指标SDNN、RMSSD、PNN50、TP、LF、HF均明显的低于健康组,p0.01,有统计学意义。结论冠心病患者的心率变异性时域和频域指标均明显减低,反应自主神经调节心脏平衡的功能减低,易发生严重的心血管事件。     

肺心病患者心率变异性改变的临床意义

目的分析慢性肺源性心脏病患者的心率变异性改变的临床意义。方法经动态心电图、血气分析检查,选取肺心病缓解期、急性期与正常受试者各42例,采用时域法分析其HRV的改变。结果肺心病组HRV均较对照组降低,且重症肺心病随血氧分压下降、二氧化碳分压升高,各参数下降更明显。结论肺心病患者HRV的改变在预测其心电变化指导临床治疗提供了重要的指标。     

老年冠心病患者心率变异性的临床意义

目的分析49例老年冠心病患者的动态心电图,探讨心率变异性（HRV）的临床意义.方法对49例老年冠心病患者进行动态心电图检查,检测其心律失常、心肌缺血的发生率和心率变异性,并与30例非冠心病老年人对比.结果冠心病组室性心律失常和心肌缺血的发生率显著高于非冠心病组,冠心病组心率变异性指标SDNN低于非冠心病组,冠心病组中有恶性室性心律失常的患者SDNN较低.结论老年冠心病患者心脏自主神经功能紊乱,并可能因此诱发恶性室性心律失常.     

卒中与心率变异性

心率变异性(heart rate variability,HRV)是一种可定量评价心脏自主神经功能的无创性指标,其分析方法 主要包括线性时域分析法、频域分析法和非线性分析法.文章对卒中患者病变类型、病灶部位、神经功能缺损程度、病程与HRV的关系,以及卒中导致HRV的可能机制和干预措施进行了综述.     

急性心肌梗塞患者同时检测窦性心率震荡与心率变异性的临床意义

目的:探讨急性心肌梗塞(AMI)患者同时检测窦性心率震荡(HRT)和心率变异性(HRV)的临床意义.方法:选择78例AMI患者,根据室性早搏Lown分级AMI患者被分为高危组(41例)和低危组(37例);另选择无心血管疾病者61例为正常对照组.所有入选者均行24h动态心电图检查,测定HRT参数震荡初始(TO)、震荡斜率...     

Effect of age on mean heart rate and heart rate variability

Age-related changes in heart rate and in its variability might prove to be a suitable parameter to evaluate the physiological course of advancing age in human beings. We demonstrated higher mean heart rate values and increased heart rate variability in younger adult subjects. A significant direct relationship was demonstrated by linear regression equation between age and the product between mean heart rate and heart rate variability. We conclude that the analysis of these parameters may help assess the aging process of human beings.     

Different methods of heart rate variability analysis reveal different correlations of heart rate variability spectrum with average heart rate

Heart rate variability (HRV) spectrum can be calculated from the R-R or the sequence of instantaneous heart rates (IHRs). Because these signals are reciprocal, their use in the determination of the correlation of HRV with average HR may yield opposite results. AIM: The aim of this study is to reveal how HRV parameters correlate with HR depending on the kind of signal used and whether the normalization procedure or use of corrected signals affect the correlations. METHODS: Electrocardiographic recordings (512 beats) of 55 patients were considered in the analysis. RR and IHRs were calculated. Both signals were divided by their average values yielding the corrected RR and IHR. Heart rate variability spectra were estimated from these 4 kinds of signals. Total power (TP), low frequency (LF) and high frequency (HF) components, LF/HF ratio, and normalized values (ie, nLF, nHF) were calculated. RESULTS: Total power and LF estimated from RR correlated negatively with HR, but those calculated from IHR revealed a trend toward a positive correlation (respective correlation coefficients significantly differed, P < .01). The sign of correlation between HF and HR was the same regardless of the type of signal applied. The application of corrected signals made the results almost identical despite different signal origins (RR or IHR). The correlations of LF/HF, nLF, and nHF with HR were similar in all cases. CONCLUSIONS: The type of signal determines the sign of correlation among TP, LF, and HR. The parameters obtained from corrected signals, normalized quantities, and LF/HF reveal a consistent relationship with HR.     

代谢综合征与心率变异性分析

目的 通过对代谢综合征患者心率变异性分析(HRV),探讨代谢综合征对心脏自主神经功能的影响及其临床意义.方法 选择108例住院患者,分为对照组(60例)和代谢综合征组(48例).并对代谢综合征组按体重指数(BMI)分为三个亚组：体重正常(BMI<23 kg/2)、超重(BMI 23～24.9 kg/m2)、肥胖(BMI≥25 kg/m2).所有患者行24小时动态心电图(Holter)检查,采集HRV时域指标和频域指标.同时测定空腹血糖(FBG)、甘油三酯(TC)、总胆固醇(TC)、糖化血红蛋白(HbAlc)、空腹胰岛素(FINS)、C反应蛋白(CRP),计算胰岛素抵抗指数HOMA-IR.结果 与对照组相比,代谢综合征组时域指标下降(P<0.05),频域指标亦下降(P<0.05)；各亚组比较,随BMI升高,各时域指标、频域指标均下降(P<0.05)；HOMA-IR、HbA1c、TC、TG、CRP均上升(P<0.05).结论 代谢综合征患者心率变异性下降,与肥胖、胰岛素抵抗有关.