Objective To investigative the correlations between QRS duration(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。
Objective To investigative the correlations between QRS duration(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。
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