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Copyright of Journal of Practical Electrocardiology is the property of Journal of Practical Electrocardiology Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Practical Electrocardiology is the property of Journal of Practical Electrocardiology Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective　To explore the value of electrocardiogram(ECG) waterfall chart in the analysis of sinus rhythm complicating competitive arrhythmias. Methods　We retrospectively analyzed the changes of ECG waterfall charts of ambulatory electrocardiography among 41 patients with sinus rhythm complicating competitive arrhythmias, and summarized their characteristics. Results　During sinus rhythm, ECG waterfall chart is continuously and stably manifested by P, QRS, and T peak bands with the same color. In the occurrence of competitive arrhythmias, the P, QRS and T peak bands change in color, or the P peak band drifts. The characteristics of the waterfall chart of sinus rhythm complicating atrial autonomic rhythm are as follows: P peak band is split while R and T peak bands remain the same. The characteristics of the waterfall chart of sinus rhythm complicating junctional autonomic rhythm are as follows: PR interval changes, P peak band splits and drifts (even drifting to the bottom of the R peak band) while the R and T peak bands remain unchanged. The characteristics of the waterfall chart of sinus rhythm complicating ventricular autonomic rhythm are as follows: P, QRS, and T peak bands synchronously change colors. Conclusion　When competitive arrhythmias and sinus rhythm are intertwined together, we can accurately grasp the onset time and duration of competitive arrhythmias by selecting the lead with obvious changes of P-QRS-T complex, and observe the changes of P, QRS and T peak bands in the ECG waterfall chart. [ABSTRACT FROM AUTHOR]

The appearance of long period complicates the original scatter plot of arrhythmia,and the scatter point drifting method serves as a "secret weapon"to solve these cases. The long period related characteristic point set is similar to the homonymous one without long period,and the former is equivalent to a drift from the latter. The drifting law of Lorenz scatter plot is as follows: the extended front period moves to the right,the extended back period moves up,and both of the front and back period extend to the upper right. The drifting law of the difference scatter plot is as follows: the extended front period moves to the left,the extended back period moves up,and the extended middle period moves to the bottom right. Taking second degree atrioventricular block scatter plot as an example,this paper summarizes the positional relationship between long period related point set and basic point set,which is popularized to premature beat related characteristic point set. This paper aims to lay a foundation for rapid analysis of ambulatory electrocardiography by exploring the analytical skills of long period related ECG scatter plot. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Practical Electrocardiology is the property of Journal of Practical Electrocardiology Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Practical Electrocardiology is the property of Journal of Practical Electrocardiology Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Abstract] Objective To determine the special functions of cardiac pacemaker by observing the morphological characteristics of its time-RR scatterplol. Methods A total of 128 patients implanted with pacemakers were classified into four groups according to special functions of cardiac pacemakers : group A ( without special function ) , group B (frequency lagging behind function ) , group C (with sick sinus syndrome or atrial fibrillation complicating VVI pacemaker’s frequency adapting to function) and group D(with sleeping function). The morphological characteristics of time-RR scat-terplot were observed in each group. Results Patients in the four groups shared the following features: ( i ) when pacing rhythm covered 24 hours, time-RR scatterplol appeared as narrow and compact “line” ,( ii ) when pacing rhythm partly covered 24 hours, an obvious “boundary line” below 1.2s showed at the upper edge of time-RR scatterplot while the lower edge formed a “ punctate or cloudlike” bar chart. The time-RR scatterplol of each group had its own characteristics: ingroup A, it was a straight line or “boundary line” ,in group B, it was separated into three layer— compact middle layer, straight linear upper layer and lower layer with fluctuating scatter belt,in group C, it was a line or “boundary line” varying in height and disobeying any changing law,in group D, it appeared as a straight line in the day while it was “ ladder-shaped” at night. Conclusion The morphological characteristics of time-RR scatterplol vary among pacemakers with different special functions and the characteristics help to make quick judgment of pacemaker’s special functions. It provides a new method and reference for primary medical staffs to judge the special functions of pacemakers quickly and accurately. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Practical Electrocardiology is the property of Journal of Practical Electrocardiology Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Practical Electrocardiology is the property of Journal of Practical Electrocardiology Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Practical Electrocardiology is the property of Journal of Practical Electrocardiology Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To discuss the mechanism and clinical value of short P-R interval on ECGs of pregnant women. Methods A total of 1 286 pregnant women were randomly selected from patients admitted into our hospital from January 2016 to January 2017. According to gestational weeks, they were divided into group A(422 cases, ≤13 weeks), group B(487 cases, 13