英文原文: SEX DIFFERENCES IN QRS DURATION Representing the time of ventricular activation, QRSduration is clinically relevant in multiple ways, suchas indications for cardiac resynchronization therapy(CRT) and evaluation for conduction system disease.Similar t...
1) a normal QRS duration QRS间期正常1. Objective:The aim of this study was to assess the prevalence of systolic dyssynchrony of the LV walls in patients of HF with a normal QRS duration by Doppler tissue imaging(DTI). 目的:应用多普勒组织显像(DTI)评估严重心衰而QRS间期正常的患者左室收缩不...
3. 3. Total QRS duration in XYZ leads was measured in 115 men, aged 20 to 50 years. The range of values was 0.0801 second to 0.1309 second, the mean 0.1010 second, the standard deviation 0.010 second. 4. 4. It is suggested that 0.12 second be the "upper normal limit" of QRS ...
Conclusions: A longer QRS duration within normal range (,120ms) is associated with a larger indexed LV end-diastolic and end-systolic volume and greater LV mass. These patients have similar 1-year mortality rate as patients with LBBB and RBBB patterns. 展开 ...
1. 1. Three ventricular complexes have been measured with the Lucas comparator in each of the three leads of 500 human electrocardiograms (150 normal subjects and 350 abnormal subjects) in order to determine the average duration of the QRS waves. 2. 2. The average duration of the QRS ...
In some series,7,9 however, the QRS duration was less than 0.10 second in almost one third of the cases, presumably due to fusion between preexcited and normally conducted complexes. The sum of the PR and QRS intervals usually remains within the normal range. A normal “septal” q wave ...
QRS class with the most QRS complexes and the shortest QRS duration was defined as the predominant normal heartbeat. Those predominant normal heartbeats were then temporally aligned by maximization of the cross‐correlation of...
Objective To explore the relativity of normal QRS complex duration(QRSd) and heart failure. Methods155 patients with chronic heart failure( HF) were admitted,and 40 persons without heart failure were choosed as controls. According to the measurements of QRSd,patients of HF were classified into ...
the presence of mechanical dyssynchrony has been indicated to play a determinant role.4–7 The putative lack of responsiveness to CRT in the absence of mechanical dyssynchrony, together with evidence that mechanical dyssynchrony may exist even when QRS duration is within the normal range, has enco...
myocardial volume alone. In proportional terms, adult heart sizes are less variable compared to the QRS duration11and while heart size reasonably correlates with body size12, the QRS duration does not9. This all potentially makes the broad range of the normal QRS complex durations somewhat ...