September 1, 1985Circulation
Change in ventricular cavity size: differential effects on QRS and T wave amplitude.
Why the study?
How do changes in left ventricular cavity size and proximity to the chest wall affect R and T wave amplitudes on ECG in normal subjects?
Population
15 normal subjects
Comparison
Increased and decreased left ventricular… vs Rest/baseline conditions
Design
Other
Authors
Discussion
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Member takes
Implication
Should not alter ECG interpretation practices; leaves open applicability to LV hypertrophy or dilation.
Structured PICO
How do changes in left ventricular cavity size and proximity to the chest wall affect R and T wave amplitudes on ECG in normal subjects?
P
Population
15 normal subjects
I
Intervention
Increased and decreased left ventricular dimensions induced by infusion of methoxamine and by Valsalva maneuver, and changes in patient position (supine to left lateral)
C
Comparator
Rest/baseline conditions
O
Outcome
Changes in R and T wave amplitudes on simultaneous nine-lead ECGssurrogate
R wave amplitude is primarily determined by the proximity of the left ventricle to the chest wall, while T wave amplitude is determined by left ventricular chamber size.
Cite This Study
Feldman et al. (1985) studied this question.