Q: Which leads in EKG are preferred to measure the QT interval?
Answer: Leads II and V5
Lead II and lead V5 is preferred due to the fact that termination of T waves is most clearly visible in these leads, which makes these leads best to measure reliable QT interval.
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Reference:
Cowan JC, Yusoff K, Moore M, et al. Importance of lead selection in QT interval measurement. Am J Cardiol 1988; 61:83.
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