Diagnostic value of Lorenz plots vector angle combined with B －line slope in arrhythmia
10.19405/j.cnki.issn1000-1492.2023.03.025
- Author:
Yue'e Wu
1
;
Zeping Hu
2
;
Han Li
1
;
Lan Ma
1
;
Linlin Zheng
3
;
Xianyun Wang
3
Author Information
1. Dept of Electrocardiology Diagnosis，The Second Affiliated Hospital of Anhui Medical University，Hefei 230601
2. Dept of Cardiovascular Medicine ，The First Affiliated Hospital of Anhui Medical University，Hefei 230022
3. Dept of Electrocardiology and Cardiac Function，The First Affiliated Hospital of Anhui Medical University，Hefei 230022
- Publication Type:Journal Article
- Keywords:
Lorenz plots;
B-line slope;
vector angle;
arrhythmia
- From:
Acta Universitatis Medicinalis Anhui
2023;58(3):494-499
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the value of vector angle of Lorenz plots(LPs) and the role of combining B-line slope in improving the diagnostic efficiency of arrhythmia．
Methods:LPs of 119 cases with ventricular premature contraction (VPC group ) ，97 cases with supraventricular premature contraction(SPC group) ，52 cases with type II°I atrioventricular block ( Ⅱ ° Ⅰ group) and 54 cases with type Ⅱ ° Ⅱ atrioventricular / sinoatrial block ( Ⅱ ° Ⅱ group) were retrospectively analyzed．The B-line slope and vector angle were measured，and the differences between groups were compared. Receiver operating characteristic curve was used to analyze the diagnostic efficacy of B-line slope，vector angle and their combination between groups ，and MedCalc software was used for statistical comparison．The consistency of intra-observer and inter-observer measurements of B-line slope and vector angle was evaluated using Intra group correlation coefficient (ICC) and Bland-Altman plot.
Results:There were significant differences between VPC group and SPC group，and between Ⅱ ° Ⅰ group and II°II group (P＜0. 05) ．The area under the curve (AUC) of B-line slope，vector angle，and the combination of the two in distinguishing ventricular and supraventricular premature contraction were 0. 81，0. 84 and 0. 87 respectively，and the AUC in distinguishing type Ⅱ ° Ⅰ and type Ⅱ ° Ⅱ atrioventricular / sinoatrial block were 0. 76，0. 78 and 0. 80 respectively．The ICC of vector angle was better than B-line slope (Intra-observer 0. 99 vs 0. 98，Inter-observer 0. 97 vs 0. 96) ．
Conclusion:Vector angle can be used to identify the type of arrhythmia，and has good intraobserver and interobserver consistency．Its combination with B-line slope has the highest accuracy in diagnosing arrhythmia，providing a new reference for clinical diagnosis and treatment.
- Full text:2024071719233488348Lorenz散点图矢量角联...斜率在心律失常中的诊断价值_吴月娥.pdf
