Key result
Mathematically derived X,Y,Z leads correlated well with true leads for filtered QRS duration (r=0.92) but poorly for terminal QRS amplitude and duration, altering LP interpretation in 22%.
Why the study?
Is a mathematically-derived X, Y, Z lead system comparable to a true orthogonal X, Y, Z lead system for late potential analysis in patients with known or suspected ventricular tachyarrhythmia?
Cross-Sectional (n=36)
Is a mathematically-derived X, Y, Z lead system comparable to a true orthogonal X, Y, Z lead system for late potential analysis in patients with known or suspected ventricular tachyarrhythmia?
Effect estimate: r = 0.92 for filtered QRS duration; r = 0.66 and 0.61 for terminal QRS amplitude and duration
p-value: p=<0.0001
Mathematically derived X, Y, Z leads from a standard 12-lead ECG are not sufficiently accurate compared to true orthogonal leads for late potential analysis, leading to discordant interpretations in 22% of cases.
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Derived leads risk discordant late potential results; leaves open their reliability versus true orthogonal leads pending prospective validation.
Cron et al. (2002) conducted a cross-sectional in known or suspected ventricular tachyarrhythmia (n=36). Mathematically derived X,Y,Z leads vs. True bipolar orthogonal X,Y,Z leads was evaluated on Time domain measurements (filtered QRS duration, terminal QRS amplitude, and duration) and late potential presence (r = 0.92 for filtered QRS duration; r = 0.66 and 0.61 for terminal QRS amplitude and duration, p=<0.0001). Mathematically derived X,Y,Z leads correlated well with true leads for filtered QRS duration (r=0.92) but poorly for terminal QRS amplitude and duration, altering LP interpretation in 22%.
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