Only 105 (3.6%) patients who presented with a prolonged QRSduration at baseline had a normal QRSduration on their last electrocardiogram before hospital discharge.
只有105名（3.6％）QRS时限延长的患者在出院前的最后一次心电图检查QRS时限恢复正常。
2
Objective To investigative the correlations between QRSduration(QRSD) and heart function and 6-minute walk test(6-MWT)in elderly patients with chronic heart failure(CHF).
目的探讨老年慢性心力衰竭（心衰，CHF）患者QRS时限（QRSD）与心功能、运动耐量相关性。
3
Chongqing Medical University, Chongqing Objective To investigate effects of contrast medium injection on QRSduration and frontal plane QRS axis during coronary angiography.