生物反馈方法治疗冠心病合并便秘患者的疗效

目的：观察生物反馈方法治疗冠心病合并慢性功能性便秘（CIC）患者症状评分和心绞痛临床疗效变化。方法：48例冠心病合并CIC患者接受了生物反馈方法治疗,治疗前后接受“便秘症状及疗效评估问卷”调查,冠心病疗效指标评估,并与49例常规治疗同病患者（对照组）比较。结果：治疗前两组患者便秘症状总分和各分项评分无显著差异（P均〉0．05）,生物反馈治疗组治疗后的便秘症状总分和各分项评分均明显优于治疗前和对照组（P〈0．05～0．01）。同时其冠心病总有效率（91．66％）明显优于对照组的71．42％（χ^2=6．572;P〈0．05）。结论：生物反馈方法可明显改善冠心病合并慢性功能性便秘患者的便秘症状和心绞痛症状。     

2型糖尿病治疗前后心率变异性分析

目的：观察2型糖尿病（type 2 diabetes mellitus,T2DM）患者治疗前后心率变异性（heart rate variability,HRV）的变化。方法选取48例T2DM患者作为糖尿病组,另选取50例健康志愿者作为对照组。观察 T2DM患者治疗前后 HRV 时域指标 SDNN、SDANN、rMSSD、PNN50和HRV频域指标LF、HF、LF／HF、VLF的变化,并与对照组比较。结果糖尿病组治疗前HRV时域和频域指标均低于对照组（P＜0．05）;与治疗前相比,糖尿病组治疗后HRV时域指标SDNN、SDANN、rMSSD、PNN50和 HRV 频域指标 LF、HF、VLF 均有不同程度的改善（P＜0．05）。结论 T2 DM患者存在心脏自主神经调节功能异常,以迷走神经受损为主,治疗后自主神经调节功能有不同程度的恢复。     

不同运动亚型帕金森病患者心脏自主神经调节功能存在差异

目的：比较震颤为主型和少动-强直为主型帕金森病(PD)患者心脏自主神经调节功能的差异。方法：收集120例PD患者（震颤为主型、少动-强直为主型各60例），招募同期健康者60例为对照组，分别进行24h动态心电图检查，收集其一般资料及自主神经功能量表(SCOPA-AUT)评分等，比较各组的SCOPA-AUT评分及心率变异性(HRV)参数。结果：无论震颤为主型还是少动-强直为主型PD患者，其SCOPA-AUT评分高于对照组(P均<0.001)，低频成分(LF)、相邻NN间期差异≥50ms占所有NN间期总数的百分比(pNN50)均低于对照组(LF：P=0.005,P=0.003；pNN50：P=0.049,P=0.002)，而少动-强直为主型PD患者的高频成分(HF)显著低于震颤为主型及对照组(P=0.019,P=0.001)，LF/HF与震颤为主型存在差异，24h内全部相邻窦性R-R间期差值的均方根值（rMSSD）、24h内全部窦性R-R间期的标准差(SDNN)明显低于对照组(P=0.003，P=0.035)。结论：帕金森病患者的自主神经功能普遍受损，少动-强直为主型PD患者的自主神经功能受损更严重，迷走神经活性明显降低。     

弥漫性甲状腺肿治疗前后心率变异性的变化

目的 探讨弥漫性甲状腺肿（又称Graves病,简称GD）患者心率变异性（HRV）的变化。方法 选取30例GD患者,另选取30例健康志愿者作为对比研究。观察GD患者治疗前后HRV指标：所有窦性心搏RR间期标准差（SDNN）、全程记录中每5 min窦性心搏RR间期平均值的标准差（SDANN）、相邻RR间期差大于或等于50 ms的个数占总心跳次数的百分比（PNN50）、低频LF（0. 04 ~ 0. 15 Hz）、高频HF（0. 15 ~ 0. 40 Hz）、LF/ HF值、极低频VLF（0. 003 3 ~0. 04 Hz）。结果 GD组治疗后与治疗前相比,时域指标：SDNN、RMSDNN、SDANN、PNN50均改善（P 均〈0. 01）;频域指标LF、HF、VLF亦均明显改善（P 均〈0. 01）;GD组治疗前HRV指标：SDNN、PNN50、LF、HF、VLF均低于对照组（P〈0. 01）;GD组治疗后与对照组相比,HRV上述指标两组无显著性差异。 GD组治疗前频域指标24 h波动曲线趋于平稳,治疗后波动性有所恢复。结论 GD患者存在心脏自主神经调节功能异常,以迷走神经受损为主;24 h频域指标波动性则趋于平稳,治疗后调节功能异常和波动性可有不同程度恢复。     

稳心颗粒对急性心肌梗死患者心率变异性的影响

目的探讨稳心颗粒对急性心肌梗死患者心率变异性（HRV）的影响。方法将87例急性心肌梗死（AMI）治疗患者随机分为2组：稳心颗粒加常规AMI治疗组（治疗组）58例，常规AMI对照组29例。治疗前进行HRV测定，2组间比较各指标差异均无显著性（P均〉0．05），治疗1个疗程（28日）后再次进行HRV测定。结果（1）治疗组治疗后止常R-R间期标准差（SDNN）、24h 5min平均正常R-R间期标准差（SDANN）、24h 5min平均正常R-R间期标准差的平均数（SDNNIDX）、24h正常相邻R-R间期之差大于50ms的心搏数所占百分比（PNN50）、低频成分（LF）、高频成分（HF）、总功率谱（TP）较治疗前均显著升高（P均〈0．01），LF／HF显著降低（P〈0．01）。（2）对照组治疗后SDANN、PNN50、LF、HF、TP较治疗前均显著升高（P均〈0．05），LF／HF显著降低（P〈0．05）。（3）治疗后稳心颗粒组与对照组比较SDANN、RMSSD、PNN50、LF、MF、HF、TP均显著升高（P均〈0．05），LF／HF显著降低（P〈0．05）。结论（1）常规AMI治疗（静脉溶栓、硝酸酯类及抗凝治疗），提高AMI患者的HRV；（2）稳心颗粒加常规AMI治疗在改善AMI患者HRV更显著，且能改善自主神经平衡性，改善预后。     

卒中后合并脑心综合征患者的便秘症状评分的调查

目的：调查卒中后合并脑心综合征（CCS）患者的便秘症状评分现况。方法：39例卒中后合并CCS患者（卒中＋CCS组）接受了“便秘症状及疗效评估问卷”评估,并与54例同期住院未合并CCS脑卒中患者（卒中对照组）比较。结果：卒中＋CCS组住院期间功能性便秘（CIC）发生率明显高于卒中对照组（64．10％比24．07％,P〈0．01）,同时卒中＋CCS组的便秘症状总分及各分项评分均明显高于卒中对照组[总分：（14．47±4．61）分比（10．25±3．17）分,P〈0．01）]。结论：卒中后合并脑心综合征患者常常患有功能性便秘,且便秘症状评分严重,后者也可能是脑心综合征发病诱因之一。     

β—受体阻滞剂和ACEI对急性心肌梗死患者心率变异性的影响

目的：探讨急性心肌梗死（AMI）患早期（72小时内）口服β-受体阻滞剂和血管紧张素转换酶抑制剂（ACEI）对心率变异性（HRV）的影响。方法：AMI患70例,根据是否使用β－受体阻滞剂或ACEI类药物分为对照组（I组,20例）,β－受体阻滞剂治疗组（Ⅱ组,26例）和ACEI治疗组（Ⅲ组,24例）,治疗前和治疗后3周分别进行HRV分析。结果：（1）与对照组相比,Ⅱ、Ⅲ组的HRV各指标SDNN、Trianguax-Index、LF（nu)、HF（nu)、LF／HF、VAI、VLI、Poincare Plots均明显改善（P＜0．05）;（2）Ⅱ、Ⅲ组HRV所有指标均较治疗前明显提高（P＜0．05）;（3）治疗后Ⅱ、Ⅲ组之间HRV指标无显性差异（P＞0．05）。结论：早期口服β－受体阻滞剂和ACEI类药物可改善AMI患的HRV指标。     

骶神经刺激对功能性出口梗阻型便秘的动力学影响及疗效观察

目的 观察骶神经刺激(SNS)对功能性出口梗阻型便秘(FOOC)的动力学影响,并评价其临床疗效.方法 将FOOC患者随机分为治疗组和对照1组、对照2组各40例,治疗组给予SNS,对照1组给予口服聚乙二醇4000散治疗,对照2组给予针刺天枢、足三里、大肠俞、上巨虚四个穴位治疗.治疗前后分别采用水灌注式测压系统进行结直肠动力学检查,并对便秘症状进行评分.结果 经过20d治疗,治疗组动力学指标显著降低(P均＜0.01),临床症状较治疗前明显改善(P均＜0.01),3组差异有统计学意义(P均＜0.05).治疗过程中未发现不良反应,治疗组随访3个月时有效率高于对照组(P＜0.05).结论 SNS可增强FOOC患者的结直肠动力,提高感觉阈值,改善FOOC的症状.     

十二指肠溃疡患者心血管自主神经功能变化与心率变异性的关系

目的：探讨十二指肠溃疡（DU）患者心血管自主神经功能变化与心率变异性（HRV）的关系。方法：将80例DU患者进行标准心血管自主神经功能试验（DAN），据此结果分成阳性组（DAN^ )及阴性组（DAN^-)。设80名健康人为对照组。动态记录24h心电图并进行HRV分析。结果：DU患者心血管自主神经功能异常的发生率为52．5％，主要表现为迷走神经功能异常；DAN% 组HRV分析中时域指标SDNN、SDNNindex、SDANN均减小（P＜0．05），且反映副交感神经张力改变的RMSSD、PNN50、HF等指标在DAN^ 组及DAN^-组中均明显增高，LF／HF比值明显减低，与对照组比较，差异有显著性（P＜0．05）。结论：DU患者存在副交感神经张力增加，副交感神经张力改变在DU发病中起着重要的作用。HRV分析是临床早期发现DU患者心血管自主神经功能异常的较好方法。     

生物反馈联合乳果糖治疗老年功能性便秘的疗效

目的 观察生物反馈联合乳果糖治疗慢性功能性便秘的临床疗效.方法 将144例慢性功能性便秘患者分为两组,治疗组予生物反馈联合乳果糖治疗;对照组予乳果糖治疗,评估临床疗效及盆底表面肌电,治疗前后行便秘症状总分与盆底表面肌电值的相关性分析.结果 两组治疗后临床症状评分较治疗前均有改善(P＜0.05).治疗组总有效率83.02％,对照组67.18％,差异有统计学意义(P＜0.05);治疗前后Glazer盆底肌评估中快速收缩阶段最大收缩波幅、持续收缩阶段收缩波幅与便秘症状总分均存在负相关(P＜0.05),持续收缩阶段变异性与便秘症状总分均存在正相关性(P＜0.05).结论 生物反馈和乳果糖治疗均能有效改善慢性便秘患者临床症状,二者联合有协同作用,Glazer盆底表面肌电评估方案可作为临床诊断和治疗慢性功能性便秘的参考依据.     

高血压患者心率变异性的性别差异及年龄影响

目的探讨性别和年龄对高血压患者心率变异性(HRV)的影响。方法采用24h动态心电图(Holter)评价300例高血压患者HRV的时域和频域指标,并将患者分为男性组(163例)和女性组(137例),再根据年龄分为≤65岁组(130例)和>65岁组(170例),分别比较不同性别和不同年龄组间HRV的差别,并对性别和年龄与HRV各指标间的相关性进行了分析。结果男性组极低频功率(VLF)、低频功率/高频功率(LF/HF)明显大于女性组(分别P=0.017和P=0.0002),标化HF(HFnorm)则明显低于女性组(P<0.0001),但是这种性别的差异仅发生在≤65岁组中。单变量回归分析显示男性与VLF、LF/HF相关较密切(分别r=-0.132,P=0.02和r=-0.176,P=0.002),女性与HFnorm相关较密切(r=0.215,P<0.0001),这种相关性也只出现在≤65岁组中,多变量回归分析只HFnorm与性别独立相关(r=0.215,P<0.0001)。≤65岁组总功率(TP)(P=0.011)、VLF(P=0.001)、低频功率(LF)(P=0.005)、标化低频功率(LFnorm)(P=0.0001)和LF/HF(P=0.001)明显大于>65岁组,而rMSSD(P=0.002)、PNN50(P=0.007)、HFnorm(P=0.031)则明显低于>65岁组,单变量回归分析除PNN50外,年龄与HRV各指标均具有显著的相关性,多变量回归分析年龄与LFnrom、LF、rMSSD独立相关(r=0.432,P<0.0001)。结论以上结果提示中年期女性高血压患者自主神经调节紊乱可能比男性更明显;老年高血压患者自主神经调节损害比中年患者更显著。     

Sympatho-vagal control of heart rate variability in patients treated with suppressive doses of L-thyroxine for thyroid cancer

OBJECTIVE: This study aimed to analyze the autonomic control of heart rate variability (HRV) in subjects receiving chronic l-thyroxine (l-T4) treatment after total thyroidectomy and (131)I therapy for differentiated thyroid carcinoma. METHODS: Blood pressure (BP) and sympatho-vagal activity (evaluated by power spectral analysis (PSA) of time-domain parameters of HRV) were studied in clinostatism and after orthostatism in 24 healthy controls, and in 12 patients taking l-T4 (125-200 mug/day) to maintain serum TSH levels at <0.01 muIU/ml. The study of HRV by PSA is a non-invasive method of analyzing sympatho-vagal control of HRV by quantifying high-frequency (HF) (0.15-0.4 Hz) and low-frequency (LF) (0.04-0.15 Hz) powers. RESULTS: Patients on L-T4 treatment had undetectable TSH levels, serum free T4 (fT4) above the normal range or at the upper limit in one case, and normal free tri-iodothyronine (fT3) levels. Heart rate and R-R intervals were not different in the two groups, both in clinostatism and in ortostatism. Systolic and mean BP were higher in patients than in controls and were inversely correlated with actual serum fT4 levels. During clinostatism, thyroid patients showed significantly lower LF power (P = 0.035), LF/(LF + HF) (P = 0.008) and LF/HF (P = 0.01) than controls. When patients moved from lying to standing, there was a significantly different decrease in orthostatic LF power (P = 0.001), LF/(LF + HF) (P = 0.044) and LF/HF (P = 0.047) versus controls. CONCLUSIONS: Changes in autonomic control of HRV, characterized by decreased sympathetic activity and impaired sympatho-vagal balance with preserved vagal tone, are detectable in patients with hyperthyroxinemia due to suppressive l-T4 therapy and increased systolic and mean, but not diastolic, BP.     

Heart Rate Variability in Peritoneal Dialysis Patients: What Is the Role of Residual Renal Function?

Background: The relationship between heart rate variability (HRV) and residual renal function (RRF) has not been elucidated previously. Methods: In this cross-sectional study, HRV was evaluated in 71 peritoneal dialysis patients. Patients were divided into RRF decline group, RRF stable group and anuric group. Results: RRF was negatively correlated with SDNN (r = -0.284, p = 0.017), TP (r = -0.247, p = 0.039), and HF (r = -0.238, p = 0.047). Significant sympathetic nerve activation was found in the RRF decline group (significantly lower SDNN, SDSD, RMSSD, pNN50, LF, HF, TP and higher LF/HF ratio) as compared to the RRF stable and anuric groups. Besides, significantly parasympathetic activation was found in the anuric group (the lowest LF/HF ratio as compared to the other groups (both p < 0.05). Multivariate stepwise regression analysis showed that the status of RRF was an independent factor associated with HRV parameters. Conclusion: This study showed autonomic nervous function in peritoneal dialysis patients was associated with a different status of RRF.     

Heart Rate Variability in Patients with Essential Hyperhidrosis: Dynamic Influence of Sympathetic and Parasympathetic Maneuvers

Background: Essential hyperhidrosis has been associated with an increased activity of the sympathetic system. In this study, we investigated cardiac autonomic function in patients with essential hyperhidrosis and healthy controls by time and frequency domain analysis of heart rate variability (HRV). Method: In this study, 12 subjects with essential hyperhidrosis and 20 healthy subjects were included. Time and frequency domain parameters of HRV were obtained from all of the participants after a 15‐minute resting period in supine position, during controlled respiration (CR) and handgrip exercise (HGE) in sitting position over 5‐minute periods in each stage. Results: Baseline values of HRV parameters including RR interval, SDNN and root mean square of successive R‐R interval differences, low frequency (LF), high frequency (HF), normalized unit of high frequency (HFnu), normalized unit of low frequency (LFnu), and LF/HF ratio were identical in two groups. During CR, no difference was detected between the two groups with respect to HRV parameters. However, the expected increase in mean heart rate (mean R‐R interval) did not occur in hyperhidrotic group, whereas it did occur in the control group (Friedman's P = 0.000). Handgrip exercise induced significant decrease in mean R‐R interval in both groups and no difference was detected between the two groups with respect to the other HRV parameters. When repeated measurements were compared with two‐way ANOVA, there was statistically significant difference only regarding mean heart rate in two groups (F = 6.5; P = 0.01). Conclusion: Our overall findings suggest that essential hyperhidrosis is a complex autonomic dysfunction rather than sympathetic overactivity, and parasympathetic system seems to be involved in pathogenesis of this disorder.     

Heart rate variability in white-coat hypertension

OBJECTIVES: The objective of this study was to compare heart rate variability (HRV) in patients with essential hypertension, in patients with white-coat hypertension and in normotensive control individuals, and to investigate a possible relation between HRV and vasoactive hormones. METHODS: Patients with essential hypertension (n=19, 61 years, median and interquartile range: 40-66 years), patients with white-coat hypertension (n=8, 52 years, median and interquartile range: 41-64 years) and normotensive participants (n=13, 50 years, median and interquartile range: 39-57 years) participated in the study. HRV was measured at rest in the supine position, during standing and during controlled forced breathing (respiration frequency >20/min). Power spectral density was calculated using Fourier transformation. RESULTS: Controlled breathing caused a decrease in low frequency (LF) variation and LF/high frequency variation (LF/HF) in all blood pressure groups. The decrease in LF was smaller in the hypertensive group (-60 ms2) than in the normotensive group (-139 ms2) (P=0.03; hypertensive group vs. normotensive group). The decrease in LF/HF induced by controlled breathing was -0.9 ms in the hypertensive group, -2.0 ms2 in the white-coat hypertensive group and -2.8 ms2 in the normotensive group, (P=0.037; hypertensive group vs. normotensive group). We found a positive correlation between baseline plasma renin concentration and LF (r=0.330, P=0.037) and LF/HF (r=0.378, P=0.016) at rest. CONCLUSION: The observed differences in HRV might reflect the impaired responsiveness to autonomic challenge in hypertensive patients. We did not find the HRV spectrum in white-coat hypertension different from the HRV spectrum in hypertension or normotension.     

实验性心肌缺血大鼠心脏自主神经活性的动态变化及意义

采用心率变异（ＨＲＶ）时域及频域指标分析急性心肌缺血２４ｈ大鼠心脏自主神经功能的变化以探讨其意义。将实验动物分成三组，即正常对照组（２０只）、假手术组（２０只）与心肌缺血组（４８只），并运用动态心电图记录２４ｈ心电信号变化。结果显示：与假手术组及正常对照组分别比较，心肌缺血组正常窦性心律ＲＲ间期标准差（ＳＤＮＮ）下降（２８．９±９．４ｍｓｖｓ３４．４±１３．７ｍｓ或３５．１±１４．３ｍｓ，Ｐ均＜０．０５），低频（ＬＦ）及低频与高频的比值（ＬＦ／ＨＦ）明显增加（１８９．４±３６．５ｍｓ２／Ｈｚｖｓ５７．３±１７．８ｍｓ２／Ｈｚ或５１．８±１８．６ｍｓ２／Ｈｚ；３．８５±０．９１ｖｓ１．７６±０．６３或１．６８±０．５７，Ｐ均＜０．０１）；２４ｈ心率功率谱示心肌缺血组ＬＦ及ＬＦ／ＨＦ波动幅度较假手术组及正常对照组增高，缺血大鼠ＬＦ与ＬＦ／ＨＦ在缺血后０～３ｈ（２６７．５±１２．４ｍｓ２／Ｈｚ、４．３３±１．０８）及９～１２ｈ（２４４．７±１３．９ｍｓ２／Ｈｚ、３．９６±０．９８）期间增高显著，而在缺血后５～７ｈ（１４９．２±８．７ｍｓ２／Ｈｚ、２．０５±０．４２）内则相对较低。结果表明大鼠心肌缺血后ＨＲＶ降低主?     

Effect of conscious sedation on cardiac autonomic regulation during colonoscopy

BACKGROUND: Colonoscopy is associated with cardiovascular events including hypotension, hypertension, and myocardial ischemia. The pathogenetic mechanisms of these cardiovascular events are unknown, but there is evidence that the autonomic nervous system may play a role. Conscious sedation is often used to relieve the inconvenience caused by the procedure. In this study, we evaluated the effects of sedation on cardiac autonomic regulation during colonoscopy. METHODS: One hundred and eighty patients undergoing elective colonoscopy were prospectively randomized into three groups: (i) sedation with intravenous midazolam (midazolam group); (ii) sedation with intravenous saline (placebo group); and (iii) no intravenous cannula (control group). Continuous electrocardiogram was recorded prior to, during, and after the colonoscopic procedure. Heart rate variability (HRV) was assessed by means of the power spectral analysis; the powers of low-frequency (LF 0.04-0.15 Hz) and high-frequency (HF 0.15-0.40 Hz) components were calculated. RESULTS: Intubation of the colonoscope increased the LF component of HRV and decreased HF power in all study groups compared to baseline recording. Furthermore, compared to baseline, the LF/HF ratio--a marker of cardiac sympathetic regulation--increased during intubation in the midazolam (P < 0.001) and placebo (P < 0.05) groups, with no change in the control group. During intubation the midazolam group presented with higher LF and lower HF power than placebo (P < 0.001) and control groups (P < 0.01). Accordingly, the LF/HF ratio was higher in the midazolam group than in the placebo (P < 0.05) or control groups (P < 0.05). CONCLUSIONS: Midazolam potentiates the dominance of the sympathetic nervous system induced by colonoscopy. Therefore, conscious sedation with midazolam may contribute to the occurrence of cardiovascular events during colonoscopy.     

Changes of heart rate variability during ventilator weaning

STUDY OBJECTIVES: Despite the recognition that ventilator weaning is associated with a change in autonomic nervous system activity, there has not been any report concerning the change of heart rate variability (HRV), a reliable method to detect autonomic nervous system activity, in patients during weaning. The aim of this study was to investigate the change of autonomic nervous system activity during ventilator weaning by HRV analysis. DESIGN: Prospective study. SETTING: A 16-bed medical ICU of a tertiary university hospital. PATIENTS: Twenty-four patients receiving mechanical ventilation were included. Twelve patients with successful extubation after a spontaneous breathing trial (SBT) [T-piece trial] were classified as the success group; otherwise, the patients were placed in the failure group. INTERVENTIONS: None. MEASUREMENTS AND RESULTS: Variables, including the total power (TP), and the high-frequency (HF) and low-frequency (LF) components of HRV, were measured in three phases: assist/control mandatory ventilation, pressure support ventilation (PSV), and SBT. While shifting from PSV to SBT, the HRV components decreased significantly in the failure group (TP, p = 0.025; LF, p = 0.007; HF, p = 0.031), but not in the success group. CONCLUSIONS: By HRV analysis, reduced HRV and vagal withdrawal of the autonomic nervous system activity are the main changes in patients with weaning failure.     

Heart Rate Variability in Young Women with Polycystic Ovary Syndrome

Background: Limited data are available related to the effects of sex hormones on cardiac autonomic function. Few studies investigated the heart rate variability (HRV) parameters during regular menstrual cycle or in postmenopausal women using hormone replacement therapy, but the results were contradictory. The aim of the study was to compare the characteristics of the autonomic innervation of the heart in polycystic ovary syndrome (PCOS) patients with regularly cycling controls. Methods: Thirty PCOS patients and 30 healthy regularly cycling controls were included in the study. Groups were compared with respect to age and various cardiovascular risk factors. Characteristics of autonomic innervation of the heart were evaluated with HRV. Power spectral analysis of HRV was performed to calculate the low frequency peak (LF 0.04–0.15 Hz), high‐frequency peak (HF 0.15–0.40 Hz), LF in normalized unit (LF nu), HF in normalized unit (HF nu) and LF/HF ratio. Results: PCOS patients had adverse cardiovascular risk profile than controls. As the HRV parameters, PCOS patients had significantly higher LF nu (P = 0.005) and LF/HF ratio (P = 0.001) and significantly lower HF (P = 0.006) and HF nu (P < 0.001) compared to controls. Conclusion: Autonomic innervation of the heart can be affected in PCOS with increased sympathetic and decreased parasympathetic components of HRV. As a result, sympathetic to parasympathetic ratio may increase in PCOS. This finding should be confirmed with larger studies also evaluating the clinical implications of altered HRV parameters.     

心肌缺血大鼠的心率功率谱变化及其与心脏性猝死关系的研究

采用心率变异（ＨＲＶ）频域指标定量评价心肌缺血大鼠的心脏自主神经功能变化及其与心脏性猝死（ＳＣＤ）的关系。Ｈｏｌｔｅｒ监测仪记录假手术组（２０只）及心肌缺血后存活组（５４只）与ＳＣＤ组（３６只）大鼠的心电信号。结果显示存活组或ＳＣＤ组大鼠于心肌缺血初始１５ｍｉｎ内的低频（ＬＦ）及低频／高频比值（ＬＦ／ＨＦ）较假手术组明显升高〔ＬＦ（ｍｓ２／Ｈｚ）：１９８．８±４１．３或２２６．７±５６．４ｖｓ６５．４±１９．６，Ｐ均＜０．０１；ＬＦ／ＨＦ：４．０８±１．１或５．１２±１．４ｖｓ１．８７±０．７，Ｐ均＜０．０１〕，而且ＳＣＤ组大鼠的ＬＦ与ＬＦ／ＨＦ较存活组增高〔ＬＦ（ｍｓ２／Ｈｚ）：２２６．７±５６．４ｖｓ１９８．８±４１．３，Ｐ均＜０．０５；ＬＦ／ＨＦ：５．１２±１．４ｖｓ４．０８±１．１，Ｐ＜０．０５〕，各组间ＨＦ无明显变化；ＳＣＤ组大鼠于ＳＣＤ发生前１５ｍｉｎ内，心率功率谱动态变化表现为ＬＦ及ＬＦ／ＨＦ随死亡时间的濒临而呈进行性升高（Ｐ＜０．０１及０．０５）。表明大鼠心肌缺血后其交感神经活性明显亢进，ＨＲＶ降低与ＳＣＤ的发生密切相关。