May 1, 1983Circulation
Quantitative analysis of the high-frequency components of the terminal portion of the body surface QRS in normal subjects and in patients with ventricular tachycardia.
Why the study?
Does quantitative analysis of the high-frequency components of the signal-averaged body surface QRS distinguish patients with ventricular tachycardia from normal subjects?
Population
54 subjects, comprising 42 normal subjects and 12 patients with symptomatic, sustained ventricular…
Comparison
Quantitative analysis of the high-frequency… vs Normal subjects (healthy controls).
Design
Case-control
Authors
Discussion
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Implication
High-frequency analysis of the signal-averaged body surface QRS is a reliable, noninvasive method for distinguishing patients with ventricular tachycardia from normal subjects.
Structured PICO
Does quantitative analysis of the high-frequency components of the signal-averaged body surface QRS distinguish patients with ventricular tachycardia from normal subjects?
P
Population
54 subjects, comprising 42 normal subjects (ages 18-67 years, mean 34.7 years) and 12 patients with symptomatic, sustained ventricular tachycardia (ages 48-76 years, mean 59 years).
I
Intervention
Quantitative analysis of the high-frequency components of the terminal portion of the surface QRS using signal averaging and high-pass, bidirectional digital filtering at 25 and 40 Hz.
C
Comparator
Normal subjects (healthy controls).
O
Outcome
Total duration of the QRS, duration of low-amplitude signals (<40 microV) in the terminal portion of the QRS, and amplitude of signals in the last 40 and 50 msec of the QRS.surrogate
High-frequency analysis of the signal-averaged body surface QRS is a reliable, noninvasive method for distinguishing patients with ventricular tachycardia from normal subjects.
Cite This Study
Denes et al. (1983) studied this question.