• 【原位心脏移植受者的标量心电图。】 复制标题 收藏 收藏
    DOI:10.1016/s0002-8703(05)80332-1 复制DOI
    作者列表:Sandhu JS,Curtiss EI,Follansbee WP,Zerbe TR,Kormos RL
    BACKGROUND & AIMS: :The 12-lead scalar electrocardiograms of heart transplant recipients were examined prior to hospital discharge (N = 191), and at 1 (N = 162), 2 (N = 97), and 3 years (N = 46) after transplantation. At the pre-discharge point, 46% had right bundle branch block (RBBB) QRS morphology (QRS duration greater than or equal to 120 msec: 20 patients, less than 120 msec: 67 patients). This finding tended to be manifest on the first day following transplantation; its prevalence remained constant over 3 years of follow up. Rejection, ischemic time, preoperative pulmonary vascular resistance, and donor age were not associated with the presence of RBBB morphology. A subgroup of 46 consecutive patients (21 with RBBB morphology) underwent right-sided heart catheterization and radionuclide angiography prior to discharge. RBBB morphology was not associated with any hemodynamic abnormality at catheterization. Based on the radionuclide study, RBBB morphology was associated with a greater left anterior oblique angle required for the best visual separation of the ventricles during acquisition of the study (angle of interventricular septal plane to sagittal plane: 69 +/- 11 versus 59 +/- 9 degrees; p = 0.019), and with the presence of right ventricular dysfunction (13 of 21 versus 6 of 25 patients; p = 0.009). The high prevalence of RBBB morphology in heart transplant recipients appears to be related to posterior rotation of the long axis of the heart in the transverse plane, probably resulting from the surgical technique, and to right ventricular dysfunction.
    背景与目标: :在出院前(N = 191),移植后第1(N = 162),第2(N = 97)和第3年(N = 46)检查心脏移植受者的12导标量心电图。在出院前,有46%的患者患有右束支传导阻滞(RBBB)QRS形态(QRS持续时间大于或等于120毫秒:20例,小于120毫秒:67例)。这一发现倾向于在移植后的第一天出现。在随访的3年中,其患病率保持恒定。排斥,缺血时间,术前肺血管阻力和供体年龄与RBBB形态无关。 46例连续亚组(21例具有RBBB形态)的亚组在出院前接受了右侧心脏导管检查和放射性核素血管造影。 RBBB形态与导管插入时的任何血液动力学异常无关。基于放射性核素的研究,RBBB形态与在获取研究过程中最佳视觉分离心室所需的更大的左前倾斜角相关(室间隔间隔与矢状面的夹角:69 /-11与59 /-9度; p = 0.019),并伴有右心功能不全(21例中的13例与25例中的6例; p = 0.009)。心脏移植受体中RBBB形态的高流行似乎与心脏长轴在横切面上的后旋转有关,这很可能是由于外科手术技术造成的,并与右心室功能障碍有关。
  • 【神经性厌食症运动期间心电图的变化。】 复制标题 收藏 收藏
    DOI:10.1016/j.jelectrocard.2020.06.012 复制DOI
    作者列表:Janzen ML,Cheung CC,Hawkins NM,Raudzus J,Geller J,Lam PY,Krahn AD
    BACKGROUND & AIMS: BACKGROUND:Anorexia Nervosa (AN) is an eating disorder characterized by low body weight, distorted body image, and an intense fear of gaining weight. Electrocardiogram (ECG) changes, particularly in the QT interval, have been implicated in AN-associated sudden death but not well defined. OBJECTIVES:To characterize QT interval changes during exercise in anorexia nervosa. METHODS:The QT interval was evaluated in a prospective cohort undergoing structured exercise. Patients from the St. Paul's Hospital Provincial Adult Tertiary Eating Disorders Program underwent a 6-minute modified exercise test protocol. A single lead ECG patch recording device was used to record a Lead I equivalent, due to challenges applying standard ECG monitoring in subjects with low body mass. Heart rate (HR) and QT interval were assessed. RESULTS:Eighteen eating disorder patients (16 female) completed testing (age 31 ± 12 years, BMI 16.5 ± 3.8 kg/m2). Patients were compared to age- and sex-matched healthy controls. HR was similar between patients and controls (baseline: 65 (55-70)bpm vs. 69 (53-73)bpm, p = 0.83; maximum: 110 (94-139) bpm vs. 108 (93-141) bpm, p = 0.96; end recovery: 62 (54-68) bpm vs. 66 (55-75) bpm, p = 0.39). QTc intervals were similar between groups at baseline (381 ± 17 ms vs. 381 ± 46 ms, p = 0.93) and end recovery (397 ± 42 ms vs 398 ± 42 ms, p = 0.91). However, AN patients demonstrated QTc prolongation while controls showed QTc shortening at maximum HR (426 ± 70 ms vs. 345 ± 59 ms, p = 0.001). CONCLUSION:Low level exercise HR increases are similar between AN patients and controls, but the QTc interval fails to shorten, which may explain the increased arrhythmic risk in AN.
    背景与目标: 背景:神经性厌食症(Anorexia Nervosa,AN)是一种饮食失调症,其特征在于低体重,身体形象扭曲以及强烈的体重增加恐惧感。心电图(ECG)的变化,特别是在QT间隔中,与AN相关的猝死有关,但尚未明确。
    目的:表征神经性厌食症运动期间QT间期的变化。
    方法:在进行结构性锻炼的前瞻性队列中评估QT间隔。来自圣保罗医院省成人三级饮食失调计划的患者接受了为时6分钟的改良运动测试方案。由于在低体重受试者中应用标准ECG监测存在挑战,因此使用单个铅ECG贴片记录设备来记录等效的LeadI。评估心率(HR)和QT间隔。
    结果:18名饮食失调患者(16名女性)完成了测试(年龄31±12岁,BMI 16.5±3.8 kg / m2)。将患者与年龄和性别相匹配的健康对照进行比较。患者和对照组之间的HR相似(基线:65(55-70)bpm vs. 69(53-73)bpm,p = 0.83;最大值:110(94-139)bpm vs.108(93-141)bpm, p = 0.96;最终恢复率:62(54-68)bpm与66(55-75)bpm,p = 0.39)。两组之间的QTc间隔在基线(381±17ms vs.381±46ms,p = 0.93)和最终恢复(397±42ms vs 398±42ms,p = 0.91)相似。但是,AN患者表现出QTc延长,而对照组显示最大HR时QTc缩短(426±70ms对345±59ms,p = 0.001)。
    结论:低水平运动HR增加在AN患者和对照组之间相似,但是QTc间隔不能缩短,这可以解释AN的心律失常风险增加。
  • 【信号平均心电图在预测恶性室性心律失常中的前瞻性社区评估:电生理引导疗法的有益结果。】 复制标题 收藏 收藏
    DOI:10.1002/clc.4960141206 复制DOI
    作者列表:Nalos PC,Pappas JM,Nyitray W,Ishimori T,DonMichael TA
    BACKGROUND & AIMS: :The role of the signal-averaged ECG was prospectively assessed in 517 patients in whom there was a suspicion for malignant ventricular arrhythmias. Patients were divided into Group I with a normal surface QRS width less than 120 ms (426 patients) and Group II with a prolonged QRS duration greater than or equal to 120 ms (91 patients). Late potentials were present in 42 (10%) Group I patients and in 24 (26%) Group II patients. Programmed ventricular stimulation was performed for standard indications in 55 patients without late potentials and in 42 patients with late potentials, combining both groups. The sudden death or recurrent sustained ventricular tachycardia rate in follow-up was evaluated based on the presence or absence of late potentials and whether programmed ventricular stimulation was performed. In the patients without late potentials, these rates were 4 patients (1.0%) in the no EP group and 3 patients (5.5%) in the EP group (p less than .05), respectively (overall 1.6%). In the patients with late potentials, these rates were 7 patients (29%) in the no EP group and 7 patients (17%) in the EP group (p = .19), respectively (overall 21%). In addition, appropriate automatic defibrillator shocks were present in 1 patient without late potentials and in 8 patients with late potentials which were not included in the recurrent sudden death or sustained ventricular tachycardia statistics. The signal-averaged ECG accurately defines patients at a higher risk for malignant ventricular arrhythmias regardless of unfiltered QRS duration.(ABSTRACT TRUNCATED AT 250 WORDS)
    背景与目标: :对怀疑患有恶性室性心律失常的517例患者进行了前瞻性评估,平均信号心电图的作用。患者分为正常表面QRS宽度小于120 ms的I组(426名患者)和QRS持续时间大于或等于120 ms延长的II组(91名患者)。 I组42例(10%)和II组24例(26%)存在晚期潜能。合并两组,对55例无晚期潜伏期的患者和42例具有晚期潜伏期的患者进行了程序性心室刺激,以作为标准适应症。根据是否存在晚期电位以及是否进行程序性心室刺激来评估随访中的猝死或复发性持续性室性心动过速。在无晚期潜伏期的患者中,无EP组的发生率分别为4例(1.0%)和EP组的3例(5.5%)(p小于0.05)(总体为1.6%)。在无潜伏期患者中,无EP组的发生率分别为7例(29%)和EP组中的7例(17%)(p = .19)(总21%)。此外,适当的自动除颤器电击存在于1例无晚期电位的患者和8例具有晚期电位的患者,这些未包括在复发性猝死或持续性室性心动过速统计中。信号平均心电图准确定义了恶性室性心律失常风险较高的患者,而不论未过滤QRS持续时间如何(摘要以250字截断)
  • 【使用H(无限)自适应算法提取胎儿心电图。】 复制标题 收藏 收藏
    DOI:10.1007/s11517-007-0235-5 复制DOI
    作者列表:Puthusserypady S
    BACKGROUND & AIMS: :The fetal electrocardiogram (fECG) contains important information regarding the health of the fetus. However, the fECG obtained noninvasively from the abdominal surface electrical recordings of a pregnant woman are dominated by strong interference from the maternal electrocardiogram (mECG). In this paper, based on the H(infinity) principle, two adaptive algorithms are proposed for the extraction of fECG from the trans-abdominal recordings of pregnant women. The motivation behind the application of H(infinity) techniques is the fact that they are robust with respect to model uncertainties and lack of statistical information regarding noise. The proposed algorithms are applied to simulated as well as real multichannel ECG recordings and their performances are compared to that of the well-known least-mean-square (LMS) adaptive algorithm. It is found that the proposed H(infinity) based algorithms perform superior to the LMS algorithm in extracting the fECG signal.
    背景与目标: :胎儿心电图(fECG)包含有关胎儿健康的重要信息。然而,从孕妇腹部表面电记录中非侵入性获得的fECG受到来自产妇心电图(mECG)的强烈干扰的支配。本文基于H(infinity)原理,提出了两种自适应算法,用于从孕妇的腹部记录中提取fECG。应用H(无穷大)技术背后的动机是这样的事实,即它们在模型不确定性和缺乏有关噪声的统计信息方面都非常可靠。所提出的算法被应用于模拟以及真实的多通道ECG记录,并将其性能与众所周知的最小均方(LMS)自适应算法进行比较。发现所提出的基于H(无穷大)的算法在提取fECG信号方面表现优于LMS算法。
  • 【数字心电图间隔测量中方法学差异的含义。】 复制标题 收藏 收藏
    DOI:10.1016/j.jelectrocard.2006.05.030 复制DOI
    作者列表:Badilini F,Sarapa N
    BACKGROUND & AIMS: :Well-specified recommendations have yet to be established on how electrocardiogram (ECG) interval measurement should be performed by digital on-screen caliper systems to assess drug-induced effect on cardiac repolarization in pharmaceutical clinical trials with adequate precision and reproducibility. Since 1997, the industry has followed the European Committee for Proprietary Medicinal Products Points to Consider by using fully manual measurement of 3 consecutive sinus rhythm PQRST complexes in 1 lead only (typically limb lead II). More recently, semiautomatic measurement performed on representative (median) beats and based on the global leads has been considered. The International Conference on Harmonization E14 guidance (June 2005) advocates development of quality standards for centralized ECG interval measurement and allows all methods "whether or not assisted by computer" but includes no recommendations on how to perform the measurement. We provide an overview of the currently available methods for digital ECG interval measurement and the implications of between-method differences on quality of ECG interval measurements. We applied 4 methods most commonly used to assess QT prolongation (applied on 3 raw beats in limb lead II or by global measurement on 1 or 12 superimposed representative beats). QT, QTc Fridericia, and RR interval durations were measured on resting 12-lead digital ECGs obtained in 26 healthy volunteers predose and at 1, 2, and 3 hours after dosing with a single 160 mg oral dose of sotalol. Absolute interval durations and changes from baseline were compared between the 4 measurement methods. A better understanding of the implications from different measurement methodologies will facilitate more informed choice of the appropriate method for ECG interval measurement on clinical trials.
    背景与目标: :关于如何通过数字屏幕卡尺系统执行心电图(ECG)间隔测量,以在足够的精度和可重复性下评估药物诱导的临床极化试验中药物对心脏复极的影响,尚无明确的建议。自1997年以来,该行业一直遵循欧洲专用药品委员会的考虑要点,仅使用1条铅(通常为四肢铅II)对3个连续的窦性心律PQRST复合物进行完全手动测量。最近,已经考虑了对具有代表性的(中位)拍子并基于总体线索进行半自动测量。国际协调会议E14指南(2005年6月)主张开发用于集中式ECG间隔测量的质量标准,并允许“无论是否由计算机辅助”的所有方法,但不包括有关如何执行测量的建议。我们概述了当前可用的数字ECG间隔测量方法,以及方法间差异对ECG间隔测量质量的影响。我们应用了最常用于评估QT延长的4种方法(应用于肢体导联II的3个原始搏动,或对1或12个叠加的代表性搏动进行整体测量)。 QT,QTc Fridericia和RR间隔持续时间是在服用26例健康志愿者的静息12导联数字心电图上测得的,分别是在口服160 mg口服他他洛尔给药后,1、2和3小时。比较了四种测量方法之间的绝对间隔持续时间和相对于基线的变化。更好地了解不同测量方法的含义将有助于在临床试验中更明智地选择合适的ECG间隔测量方法。
  • 【用于日常生活心电图监测的可穿戴臂环装置。】 复制标题 收藏 收藏
    DOI:10.1109/TBME.2020.2987759 复制DOI
    作者列表:Lazaro J,Reljin N,Hossain MB,Noh Y,Laguna P,Chon KH
    BACKGROUND & AIMS: :A wearable armband electrocardiogram (ECG) monitor has been used for daily life monitoring. The armband records three ECG channels, one electromyogram (EMG) channel, and tri-axial accelerometer signals. Contrary to conventional Holter monitors, the armband-based ECG device is convenient for long-term daily life monitoring because it uses no obstructive leads and has dry electrodes (no hydrogels), which do not cause skin irritation even after a few days. Principal component analysis (PCA) and normalized least mean squares (NLMS) adaptive filtering were used to reduce the EMG noise from the ECG channels. An artifact detector and an optimal channel selector were developed based on a support vector machine (SVM) classifier with a radial basis function (RBF) kernel using features that are related to the ECG signal quality. Mean HR was estimated from the 24-hour armband recordings from 16 volunteers in segments of 10 seconds each. In addition, four classical HR variability (HRV) parameters (SDNN, RMSSD, and powers at low and high frequency bands) were computed. For comparison purposes, the same parameters were estimated also for data from a commercial Holter monitor. The armband provided usable data (difference less than 10% from Holter-estimated mean HR) during 75.25%/11.02% (inter-subject median/interquartile range) of segments when the user was not in bed, and during 98.49%/0.79% of the bed segments. The automatic artifact detector found 53.85%/17.09% of the data to be usable during the non-bed time, and 95.00%/2.35% to be usable during the time in bed. The HRV analysis obtained a relative error with respect to the Holter data not higher than 1.37% (inter-subject median/interquartile range). Although further studies have to be conducted for specific applications, results suggest that the armband device has a good potential for daily life HR monitoring, especially for applications such as arrhythmia or seizure detection, stress assessment, or sleep studies.
    背景与目标: :可穿戴的袖标心电图(ECG)监视器已用于日常生活监视。袖标记录了三个ECG通道,一个肌电图(EMG)通道和三轴加速度计信号。与传统的Holter监护仪相反,基于袖章的ECG设备使用方便,因为它不使用阻塞性导线,并且电极干燥(无水凝胶),即使在几天后也不会引起皮肤刺激,因此可用于长期的日常生活监测。主成分分析(PCA)和归一化最小均方(NLMS)自适应滤波用于减少ECG通道的EMG噪声。基于具有径向基函数(RBF)内核的支持向量机(SVM)分类器,使用与ECG信号质量相关的功能,开发了伪像检测器和最佳通道选择器。平均HR是根据16位志愿者的24小时臂章录音估算出来的,每节10秒。此外,还计算了四个经典的HR可变性(HRV)参数(SDNN,RMSSD以及低频段和高频段的功率)。为了进行比较,对商用Holter监测仪的数据也估算了相同的参数。当用户不在床上时,臂章提供了有用的数据(与Holter估计的平均HR的差异小于10%),当用户未躺在床上时,这些段的数据为98.49%/ 0.79%(受试者之间的中位数/四分位间距)床段。自动伪像检测器发现,在非就寝时间可以使用53.85%/ 17.09%的数据,在就寝时间可以使用95.00%/ 2.35%的数据。 HRV分析获得的Holter数据的相对误差不高于1.37%(受试者间中位数/四分位间距)。尽管必须针对特定的应用进行进一步的研究,但结果表明,该袖标设备具有用于日常HR监测的良好潜力,尤其是对于心律不齐或癫痫发作检测,压力评估或睡眠研究等应用。
  • 【心电图引导的尖端定位在周围插入中央导管放置中的临床应用。】 复制标题 收藏 收藏
    DOI:10.4103/jcrt.JCRT_46_18 复制DOI
    作者列表:Li W,Xu R,Fan D
    BACKGROUND & AIMS: Objective:The objective of the study was to perform the control study between the electrocardiogram (ECG)-guided tip positioning and traditional radiological confirmation method in peripherally inserted central catheters (PICC) placement; the accuracy and applicability of ECG-guided tip positioning were investigated. It aimed to expand the scope of PICC applications. Methods:From March 2016 to August 2017, 101 cases of patient with tumor admitted to the hospital were included in this study. The control study was performed before and after PICC placement. The tip positioning of PICC placement was performed under the guidance of bedside ECG system. The X-ray confirmation was applied for confirmation. Several parameters were observed, including positioning accuracy, success rate of primary catheterization, incidence of ectopic catheter, average catheterization time, and incidence of complications. Results:Position accuracy was 100%. The success rate of primary catheterization was 99%. The incidence of ectopic catheter was 1%. Average catheterization time was (49.59 ± 21.45) min. Incidence of postoperative complications within 1 week was 4%. Conclusion:ECG-guided PICC tip positioning was safe and accurate. Success rate of catheterization could be improved. ECG-guided PICC tip positioning can be applied as an alternative approach for patients with P-wave fluctuations.
    背景与目标: 目的:本研究的目的是进行心电图(ECG)引导的尖端定位与传统放射学确认方法在周围插入中央导管(PICC)放置之间的对照研究;研究了心电图引导尖端定位的准确性和适用性。目的是扩大PICC的应用范围。
    方法:2016年3月至2017年8月,本研究收治了101例肿瘤患者。在放置PICC之前和之后进行了对照研究。 PICC放置的尖端定位是在床旁ECG系统的指导下进行的。使用X射线确认进行确认。观察到几个参数,包括定位精度,初次导管插入的成功率,异位导管的发生率,平均导管插入时间和并发症的发生率。
    结果:定位精度为100%。一次导管插入术的成功率为99%。异位导管的发生率为1%。平均导管插入时间为(49.59±21.45)分钟。 1周内术后并发症发生率为4%。
    结论:ECG引导的PICC尖端定位安全,准确。导管插入术的成功率可以提高。 ECG引导的PICC尖端定位可作为P波波动患者的替代方法。
  • 【与电子束计算机断层扫描相比,通过断层扫描心电图门控平衡放射性核素血管造影术评估肺血栓内膜切除术。】 复制标题 收藏 收藏
    DOI:10.1016/j.nuclcard.2006.09.009 复制DOI
    作者列表:Clements IP,Mullan BP,O'Connor MK,Breen JF,McGregor CG
    BACKGROUND & AIMS: BACKGROUND:Successful thromboendarterectomy for chronic thromboembolic pulmonary hypertension promptly improves right ventricular (RV) function by decreasing RV volume and increasing ejection fraction (EF). Single photon emission computed tomography (SPECT) equilibrium radionuclide angiocardiography (ERNA) has been validated as a measure of RV and left ventricular (LV) volume and EF. METHODS AND RESULTS:Nine patients with chronic thromboembolic pulmonary hypertension underwent electron beam computed tomography (EBCT) and SPECT ERNA cardiac studies before and after thromboendarterectomy. EBCT and SPECT ERNA measures of RV and LV volume and EF were compared. Before thromboendarterectomy, EBCT and SPECT ERNA RV and LV volumes and RV EF were similar. LV EF was within the normal range with both methods but was slightly greater (P = .004) when measured by EBCT (mean +/- SD, 0.61 +/- 0.08) compared with SPECT ERNA (0.54 +/- 0.10). Thromboendarterectomy measured by EBCT and SPECT ERNA produced marked similar and significant decreases in RV end-systolic (-72 +/- 59 mL vs -58 +/- 25 mL) and end-diastolic (-75 +/- 85 mL vs -76 +/- 32 mL) volumes and similar slight increases in RV EF (0.12 +/- 0.07 vs 0.05 +/- 0.06). Slight decreases in mean LV end-systolic (-19 +/- 23 mL vs -5 +/- 13 mL, P = .05) and end-diastolic (-32 +/- 53 mL vs -9 +/- 31 mL, P = .21) volumes occurred, with little change in mean LV EF (0.05 +/- 0.07 vs 0.00 +/- 0.10). CONCLUSIONS:SPECT ERNA is an accurate method for measuring RV and LV volume and EF before and after thromboendarterectomy.
    背景与目标: 背景:成功的用于慢性血栓栓塞性肺动脉高压的血栓内膜切除术可通过减少RV体积和增加射血分数(EF)迅速改善右心室(RV)功能。单光子发射计算机断层扫描(SPECT)平衡放射性核素血管造影(ERNA)已被验证为RV和左心室(LV)体积和EF的量度。
    方法和结果:9例慢性血栓栓塞性肺动脉高压患者在血栓内膜切除术前后均接受了电子束计算机断层扫描(EBCT)和SPECT ERNA心脏检查。比较了RVCT和LV体积以及EF的EBCT和SPECT ERNA测量值。血栓内膜切除术之前,EBCT和SPECT ERNA的RV和LV体积以及RV EF相似。两种方法的LV EF均在正常范围内,但与SPECT ERNA(0.54 /-0.10)相比,通过EBCT测量时,LV EF略高(P = .004)(平均值/-SD,0.61 /-0.08)。通过EBCT和SPECT ERNA测量的血栓内膜切除术在RV收缩末期(-72 /-59 mL对-58 /-25 mL)和舒张末期(-75 /-85 mL对-76 /-32)产生了相似且显着的降低毫升)体积和RV EF的类似轻微增加(0.12 / 0.07比0.05 / 0.06)。平均LV收缩末期(-19 /-23 mL vs --5 /-13 mL,P = .05)和舒张末期(-32 /-53 mL vs -9 /-31 mL,P =。 21)出现体积,平均LV EF几乎没有变化(0.05 /-0.07对0.00 /-0.10)。
    结论:SPECT ERNA是在血栓内膜切除术前后测量RV,LV体积和EF的准确方法。
  • 【胎儿心电图ST段的分析和新生儿酸中毒的预测。】 复制标题 收藏 收藏
    DOI:10.1016/j.ijgo.2007.01.003 复制DOI
    作者列表:Vayssiere C,Haberstich R,Sebahoun V,David E,Roth E,Langer B
    BACKGROUND & AIMS: OBJECTIVE:To determine the diagnostic value of fetal ST-segment analysis (STAN) in predicting neonatal acidosis. METHODS:The STAN S21 was used to monitor singleton fetuses in labor with abnormal FHR. Physicians later reviewed tracings to identify any ST events dictating intervention. Outcome measures were umbilical artery pH< or =7.15 and pH< or =7.05 at birth. The sensitivity, specificity, PPV, and NPV of a significant ST event to predict both outcomes were calculated. RESULTS:Analysis included 411 women. Sensitivity of a significant ST event for screening pH< or =7.15 (21.9%) was 38% (41/108), specificity 83% (252/303), PPV 45% (41/92) and NPV 79% (252/319), and for pH< or =7.05, it was (3.4%), 62.5% (10/16), 79% (313/395), 11% (10/92), and 98% (313/319), respectively. CONCLUSION:In a population with abnormal FHR in labor, STAN sensitivity is moderate (almost 40%) for predicting pH< or =7.15 and better (almost 60%) for more severe acidosis (pH< or =7.05).
    背景与目标: 目的:确定胎儿ST段分析(STAN)对预测新生儿酸中毒的诊断价值。
    方法:STAN S21用于监测胎心率异常的单胎胎儿。内科医生随后检查了示踪剂,以发现任何指示干预的ST事件。结果测量是出生时脐动脉pH <或= 7.15和pH <或= 7.05。计算了可预测两种预后的重大ST事件的敏感性,特异性,PPV和NPV。
    结果:分析包括411名妇女。筛查pH <或= 7.15(21.9%)的重大ST事件的敏感性为38%(41/108),特异性83%(252/303),PPV 45%(41/92)和NPV 79%(252 / 319),对于pH <或= 7.05,分别为(3.4%),62.5%(10/16),79%(313/395),11%(10/92)和98%(313/319) , 分别。
    结论:在FHR异常的人群中,STAN对预测pH <或= 7.15的敏感性为中度(近40%),对更严重的酸中毒(pH <或= 7.05)的敏感性为(近60%)。
  • 【探索专业知识,临床病史和视觉搜索对心电图解释的影响。】 复制标题 收藏 收藏
    DOI:10.1177/0272989X13492016 复制DOI
    作者列表:Wood G,Batt J,Appelboam A,Harris A,Wilson MR
    BACKGROUND & AIMS: BACKGROUND:The primary aim of this study is to understand more about the perceptual-cognitive mechanisms underpinning the expert advantage in electrocardiogram (ECG) interpretation. While research has examined visual search processes in other aspects of medical decision making (e.g., radiology), this is the first study to apply the paradigm to ECG interpretation. The secondary aim is to explore the role that clinical history plays in influencing visual search behavior and diagnostic decision making. While clinical history may aid diagnostic decision making, it may also bias the visual search process. METHODS:Ten final-year medical students and 10 consultant emergency medics were presented with 16 ECG traces (8 with clinical history that was not manipulated independently of case) while wearing eye tracking equipment. The ECGs represented common abnormalities encountered in emergency departments and were among those taught to final-year medical students. Participants were asked to make a diagnosis on each presented trace and report their level of diagnostic confidence. RESULTS:Experts made significantly faster, more accurate, and more confident diagnoses, and this advantage was underpinned by differences in visual search behavior. Specifically, experts were significantly quicker at locating the leads of critical importance. Contrary to our hypothesis, clinical history had no significant effect on the readers' ability to detect the abnormality or make an accurate diagnosis. CONCLUSIONS:Accurate ECG interpretation appears dependent on the perceptual skill of pattern recognition and specifically the time to fixate the critical lead(s). Therefore, there is potential clinical utility in developing perceptual training programs to train novices to detect abnormalities more effectively.
    背景与目标: 背景:本研究的主要目的是更多地了解心电图(ECG)解释专家优势的知觉-认知机制。尽管研究已经在医学决策的其他方面(例如放射学)研究了视觉搜索过程,但这是首次将范例应用于ECG解释的研究。第二个目的是探讨临床病史在影响视觉搜索行为和诊断决策中的作用。尽管临床病史可能有助于诊断决策,但也可能会偏向视觉搜索过程。
    方法:在佩戴眼动追踪设备的情况下,向10名最后一年的医学生和10名急诊医学顾问提供了16条ECG痕迹(其中8条的临床病史并未独立于病例进行操作)。心电图代表急诊科遇到的常见异常情况,并且是针对最后一年的医学生教授的心电图。要求参与者对每个显示的迹线进行诊断,并报告他们的诊断信心水平。
    结果:专家做出了更快,更准确和更自信的诊断,并且这一优势得到了视觉搜索行为差异的支持。具体来说,专家在查找至关重要的线索方面要快得多。与我们的假设相反,临床病史对读者发现异常或做出准确诊断的能力没有重大影响。
    结论:正确的心电图解释取决于模式识别的感知技能,尤其是固定关键导线的时间。因此,在开发知觉训练程序以训练新手更有效地检测异常方面有潜在的临床效用。
  • 【无冠状动脉闭塞的患者选择性经皮冠状动脉介入治疗后存在De Winter心电图模式:病例报告。】 复制标题 收藏 收藏
    DOI:10.1097/MD.0000000000018656 复制DOI
    作者列表:Chen S,Wang H,Huang L
    BACKGROUND & AIMS: RATIONALE:The De Winter electrocardiogram (ECG) pattern is considered as a ST elevated myocardial infarction (STEMI)-equivalent pattern. Due to its rare nature, it is unclear whether this ECG pattern suggests the presence of some other condition. PATIENT CONCERNS:We reported a 47-year-old man with new-onset chest discomfort several hours after the second-stage percutaneous coronary intervention (PCI). DIAGNOSES:An emergency coronary angiogram (CAG) did not show any abnormality. However, the dynamic changes in the ECG and myocardial biomarkers indicated perioperative myocardial infarction. INTERVENTION:The patient was monitored in the cardiac care unite (CCU), and was administered an intravenous infusion of diltiazem and subcutaneous injection of low molecular weight heparin. OUTCOMES:After a few hours, his symptoms were alleviated. The patient was discharged after 6 days of hospitalization without any complications. LESSONS:The De Winter ECG pattern can be observed in patients without significantly coronary arteries occlusion. The newly onset De Winter ECG pattern after PCI procedure may indicate perioperative myocardial infarction caused by impaired microvascular perfusion.
    背景与目标: 理由:De Winter心电图(ECG)模式被认为是ST升高的心肌梗死(STEMI)等效模式。由于其罕见的性质,目前尚不清楚这种ECG模式是否暗示存在某些其他情况。
    患者的担忧:我们报告了一名47岁的男性,在第二阶段经皮冠状动脉介入治疗(PCI)后数小时内出现新发的胸部不适。
    诊断:紧急冠状动脉造影(CAG)未显示任何异常。然而,心电图和心肌生物标志物的动态变化表明围手术期心肌梗塞。
    干预:患者在心脏监护病房(CCU)进行了监测,并接受了地尔硫卓的静脉输注和低分子量肝素的皮下注射。
    结果:几个小时后,他的症状得到缓解。住院6天后出院,无任何并发症。
    教训:在没有明显冠状动脉闭塞的患者中可以观察到De Winter ECG模式。 PCI手术后新近发生的De Winter ECG模式可能表明微血管灌注受损导致围手术期心肌梗塞。
  • 【利用无创胎儿心电图对正常胎儿的心脏时间间​​隔进行系统回顾。】 复制标题 收藏 收藏
    DOI:10.1186/s12884-018-2006-8 复制DOI
    作者列表:Smith V,Arunthavanathan S,Nair A,Ansermet D,da Silva Costa F,Wallace EM
    BACKGROUND & AIMS: BACKGROUND:Non-invasive fetal electrocardiogram (NIFECG) is an evolving technology in fetal surveillance which is attracting increasing research interest. There is however, only limited data outlining the reference ranges for normal cardiac time intervals (CTIs). The objective of our group was to carry out a systematic review to outline normal fetal CTIs using NIFECG. METHODS:A systematic review of peer reviewed literature was performed, searching PUBMED,Ovid MEDLINE and EMBASE. The outcomes of interest included fetal CTIs (P wave duration, PR interval, QRS duration and QT interval) and a descriptive summary of relevant studies as well. The outcomes were grouped as early pre-term (≤ 32 weeks), moderate to late pre-term (32-37 weeks) and term (37-41 weeks). RESULTS:8 studies were identified as suitable for inclusion. Reference ranges of CTIs were generated. Both PR interval and QRS duration demonstrated a linear correlation with advancing gestation. Several studies also demonstrated a reduction in signal acquisition between 27 and 32 weeks due to the attenuation by vernix caseosa. In this group, both the P wave and T waves were difficult to detect due to signal strength and interference. CONCLUSION:NIFECG demonstrates utility to quantify CTIs in the fetus, particularly at advanced gestations. Larger prospective studies should be directed towards establishing reliable CTIs across various gestations.
    背景与目标: 背景:无创胎儿心电图(NIFECG)是一种在胎儿监护中不断发展的技术,正引起越来越多的研究兴趣。但是,只有有限的数据概述了正常心脏时间间​​隔(CTI)的参考范围。我们小组的目的是对使用NIFECG进行的正常胎儿CTI进行系统的综述。
    方法:对同行评审文献进行系统综述,检索PUBMED,Ovid MEDLINE和EMBASE。感兴趣的结果包括胎儿CTI(P波持续时间,PR间隔,QRS持续时间和QT间隔)以及相关研究的描述性摘要。结果分为早产期(≤32周),中至早产期(32-37周)和足月期(37-41周)。
    结果:确定了8项适合纳入的研究。生成了CTI的参考范围。 PR间期和QRS持续时间均与妊娠进展呈线性相关。几项研究还表明,由于酪蛋白感染的衰减,信号采集在27至32周之间减少了。在该组中,由于信号强度和干扰,P波和T波均难以检测。
    结论:NIFECG证明了定量胎儿中CTI的实用性,尤其是在晚期妊娠时。较大的前瞻性研究应针对在各种妊娠中建立可靠的CTI。
  • 【经皮心脏起搏期间心室捕获的心电图。】 复制标题 收藏 收藏
    DOI:10.1016/j.jelectrocard.2019.12.002 复制DOI
    作者列表:Zagkli F,Georgakopoulou A,Chiladakis J
    BACKGROUND & AIMS: BACKGROUND:Transcutaneous cardiac pacing (TCP) is deeply entwined with the problem of assessing ventricular capture on the electrocardiogram (ECG). We sought clarification of ventricular capture during TCP. METHODS:We studied one hundred and ten patients (75 ± 12 years) with bradycardia who underwent pacemaker or implantable cardioverter-defibrillator implantation. The cohort was stratified by structural heart disease (SHD) status and presence of narrow or wide QRS during spontaneous heart rhythm. We compared 12-lead ECG data at baseline (48 ± 7 beats/min) with those of TCP as well as of transvenous pacing (TVP) at a similar increased heart rate (76 ± 9 beats/min) to ensure constant ventricular capture. The QT interval was corrected for heart rate (QTc) using Bazett's method as well as by the Hodge's and Rautaharju's formulae depending on the presence of narrow or wide QRS at baseline. Electromechanical coupling was assessed by noninvasive arterial pressure measurement. RESULTS:TCP (median 80 mA) produced a QRS pattern resembling left bundle branch block. Overall, both TCP and TVP induced significant QRS and QTc prolongations when compared with baseline measures (p < 0.001). TCP created narrower QRS than TVP in those patients with SHD and narrow QRS (p < 0.006). There was no significant QTc duration difference between TCP and TVP. Mean arterial pressure underwent similar significant decrease following either TCP or TVP over baseline (p < 0.001), without difference between the two pacing approaches in any patient group. CONCLUSION:TCP is associated with similar ECG and hemodynamic responses to those of TVP, regardless of the presence of SHD.
    背景与目标: 背景:经皮心脏起搏(TCP)与评估心电图(ECG)上的心室捕获问题紧密相关。我们寻求澄清TCP期间的心室捕获。
    方法:我们研究了110例(75±12岁)的心动过缓患者,这些患者接受了起搏器或可植入的心脏复律除颤器植入术。该队列按结构性心脏病(SHD)的状态以及自发性心律期间存在窄或宽QRS进行分层。我们将基线时的12导联心电图数据(48±7次/分钟)与TCP以及静脉起搏(TVP)的心率(76±9次/分钟)进行了比较,以确保恒定的心室捕获。使用基线的窄或宽QRS,使用Bazett方法以及Hodge和Rautaharju公式对QT间隔的心率(QTc)进行校正。机电耦合通过无创动脉压测量进行评估。
    结果:TCP(中值80 mA)产生了类似于左束支传导阻滞的QRS模式。总体而言,与基线指标相比,TCP和TVP均引起显着的QRS和QTc延长(p <0.001)。在SHD和QRS狭窄的患者中,TCP产生的QRS较TVP狭窄(p <0.006)。 TCP和TVP之间没有显着的QTc持续时间差异。 TCP或TVP后,平均动脉压经历了类似的显着下降(p <0.001),在任何患者组中两种起搏方法之间没有差异。
    结论:TCP与TVP具有相似的心电图和血流动力学反应,无论是否存在SHD。
  • 【基于小波变换,QRS重心拟合和区域方法的心电图基线漂移校正研究。】 复制标题 收藏 收藏
    DOI:10.1007/s13246-010-0033-5 复制DOI
    作者列表:Song J,Yan H,Li Y,Mu K
    BACKGROUND & AIMS: :Baseline wandering in electrocardiogram (ECG) is one of the biggest interferences in visualization and computerized detection of waveforms (especially ST-segment) based on threshold decision. A new method based on wavelet transform, QRS barycenter fitting and regional method was proposed in this paper. Firstly, wavelet transform as a coarse correction was used to remove the baseline wandering, whose frequency bands were non-overlapping with that of ST-segment. Secondly, QRS barycenter fitting was applied as a detailed correction. The third, the regional method was used to transfer baseline to zero. Finally, the method in this paper was proved to perform better than filtering and function fitting methods in baseline wandering correction after the long-term ST database (LTST) verification. In addition, the proposed method is simple and easy to carry out, and in current use.
    背景与目标: :心电图基线漂移(ECG)是基于阈值决策的波形(尤其是ST段)的可视化和计算机检测中的最大干扰之一。提出了一种基于小波变换,QRS重心拟合和区域方法的新方法。首先,使用小波变换作为粗略校正来消除基线漂移,基线漂移的频带与ST段的频带不重叠。其次,应用QRS重心拟合作为详细校正。第三,使用区域方法将基线转换为零。最后,经长期ST数据库(LTST)验证,证明该方法在基线漂移校正中比滤波和函数拟合方法具有更好的性能。另外,所提出的方法简单且易于实施,并且在当前使用。
  • 【运动员的Wolff-Parkinson-White心电图模式:如何以及何时评估危险性心律失常的风险。儿科心脏病专家的意见。】 复制标题 收藏 收藏
    DOI:10.2459/01.JCM.0000219320.97256.4d 复制DOI
    作者列表:Sarubbi B
    BACKGROUND & AIMS: :Although diagnostic assessment and treatment have been described in detail in patients with symptomatic Wolff-Parkinson-White (WPW) syndrome, the management of asymptomatic subjects remains controversial. Usually they are assumed to have a benign prognosis, although they do very occasionally present with ventricular fibrillation (VF) as the first manifestation of the syndrome. Discovering a WPW pattern in a previously asymptomatic athlete on a routine electrocardiogram (ECG) identifies the necessity for more accurate screening tests. However, non-invasive methods (Holter monitoring, exercise treadmill testing) seem to be relatively incomplete for risk stratification, especially for athletes. Current guidelines do not always recommend a routine electrophysiological study (EPS) in patients with an asymptomatic WPW ECG pattern, especially in children younger than 12 years. Individuals who engage in high-risk occupations or those patients who have a pre-excitation pattern which precludes them from following their chosen career or activities may be exceptions. The presence of inducible reciprocating tachycardia during EPS, especially when it triggers atrial fibrillation with short RR interval, can represent a specific risk marker of dangerous arrhythmias.
    背景与目标: :尽管对有症状的沃尔夫-帕金森-怀特(WPW)综合征患者进行了详细的诊断评估和治疗,但无症状患者的治疗仍存在争议。通常认为它们预后良好,尽管偶尔会出现室颤(VF)作为该综合征的首发表现。在常规心电图(ECG)上发现以前没有症状的运动员中的WPW模式可确定进行更准确筛查测试的必要性。但是,对于风险分层,非侵入性方法(动态心电图监测,运动跑步机测试)似乎相对不完整,尤其是对于运动员而言。当前的指南并不总是建议对无症状WPW ECG模式的患者进行常规电生理研究(EPS),尤其是对于12岁以下的儿童。从事高风险职业的个人或具有预激励模式的患者可能会例外,因为这种模式会阻止他们从事自己选择的职业或活动。 EPS期间存在可诱导的往复性心动过速,特别是当它以短的RR间隔触发房颤时,可能是危险性心律失常的特定危险标志。

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