NDLI: Automatic QT measurements and dynamic QT behaviour on a 2 channel 24 hour recording: importance of lead selection and QT offset determination

Content Provider	IEEE Xplore Digital Library
Author	Tavernier, R. Carton, F. Courville, J. Jordaens, L.J.
Copyright Year	1995
Description	Author affiliation: Dept. of Cardiology, Univ. Hospital, Ghent, Belgium (Tavernier, R.; Carton, F.; Courville, J.; Jordaens, L.J.)
Abstract	Lead selection could influence the accuracy of automatic QT measurements from a 24 hour ECG recording. QT/RR slopes derived from QTapex and QTend may be different. Therefore, 20 consecutive two-channel (modified bipolar V1 and V5) Holter recordings were reviewed on "intention to analyse" basis to assess the influence of lead selection and QT offset measurement. Reliable measurements over 24 hour derived from mV1 could be obtained in 7/20 (35%) recordings. mV5 could be used in 14/20 (70%) recordings (difference=35%; 95% Cl: 6 to 64%). The root mean square value (RMS) of mV1 and mV5 was reliable for analysis in 18/20 (90%) recordings (difference with mV1=55%; 95% Cl: 30 to 80%; difference with mV5/spl ap/20%; 95% Cl: -4 to 44%). There was no difference in QT measurements or in slope measurements derived from mV1, mV5 and RMS. The slopes derived from QTapex and QTend measurements were not different in mV5 and the RMS measurements over 24 hour. In conclusion, lead selection significantly influences the ability for correct automatic QT measurements. However, between the 3 selected measurements there is no difference in QT interval or slope measurements over 24 hour if leads were reliable. There exists no major difference in slopes derived from QTapex and QTend over 24 hour.
Starting Page	773
Ending Page	776
File Size	313948
Page Count	4
File Format	PDF
ISBN	0780330536
DOI	10.1109/CIC.1995.482779
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-09-10
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heart rate interval Electrocardiography Heart rate Cardiology Dispersion Cancer Hospitals Root mean square Pareto analysis Autonomic nervous system
Content Type	Text
Resource Type	Article

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