We assessed the relationship between QT dispersion and a heart failure survival score (HFSS). 12-lead ECGs were recorded to computer during 18 cardiac transplant assessment sessions on 17 patients. The HFSS was calculated for each subject from clinical data. QT intervals were measured manually and by an automatic technique. HFSS ranged from 6.27 to 9.80, with 5 assessments classified as low risk (HFSS 8.1), 7 classified as medium risk (7.2 < HFSS < 8.1) and 6 classified as high risk (HFSS 7.2). Dispersion measured manually ranged from 29 to 92 ms with mean (range) for the low, medium and high risk groups of 47 (29-59), 49 (35-61) and 60 (32-92) ms respectively. There were no significant differences between risk groups with manual measurement. Biphasic and ST offsets presented measurement difficulties for automated measurements.
Langley P, King ST, Dark JH, Murray A. The relationship between QT dispersion and a heart failure survival score. Computers in Cardiology 2001;28:649-52.
Dr. Philip Langley, Freeman Unit, Newcastle upon Tyne. Tel: +44 (0)191-223-6161.
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, NE7 7DN, UK.
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