Reasons for failure of lead I (alternate vector), lead II (secondary vector), and lead III (primary vector) in normal subjects and congenital heart disease patients
| . | ECG parameter . | Lead I (alternate vector) . | Lead II (secondary vector) . | Lead III (primary vector) . |
|---|---|---|---|---|
| Large R-wave | ||||
| Normal subjects | Large T-wave | 40% | 10% | 20% |
| Large T-wave, small R-wave | 30% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | ||||
| TOF | Large T-wave | 30% | 20% | 10% |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | 30% | 50% | |
| Large R-wave | 10% | |||
| TGA | Large T-wave | 10% | 30% | |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | 20% | 20% | ||
| SVP | Large T-wave | 30% | 50% | 30% |
| Large T-wave, small R-wave | ||||
| Large R-wave and T-wave | 10% |
| . | ECG parameter . | Lead I (alternate vector) . | Lead II (secondary vector) . | Lead III (primary vector) . |
|---|---|---|---|---|
| Large R-wave | ||||
| Normal subjects | Large T-wave | 40% | 10% | 20% |
| Large T-wave, small R-wave | 30% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | ||||
| TOF | Large T-wave | 30% | 20% | 10% |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | 30% | 50% | |
| Large R-wave | 10% | |||
| TGA | Large T-wave | 10% | 30% | |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | 20% | 20% | ||
| SVP | Large T-wave | 30% | 50% | 30% |
| Large T-wave, small R-wave | ||||
| Large R-wave and T-wave | 10% |
TOF, tetralogy of Fallot; TGA, transposition of great arteries; SVP, single-ventricle physiology.
Reasons for failure of lead I (alternate vector), lead II (secondary vector), and lead III (primary vector) in normal subjects and congenital heart disease patients
| . | ECG parameter . | Lead I (alternate vector) . | Lead II (secondary vector) . | Lead III (primary vector) . |
|---|---|---|---|---|
| Large R-wave | ||||
| Normal subjects | Large T-wave | 40% | 10% | 20% |
| Large T-wave, small R-wave | 30% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | ||||
| TOF | Large T-wave | 30% | 20% | 10% |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | 30% | 50% | |
| Large R-wave | 10% | |||
| TGA | Large T-wave | 10% | 30% | |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | 20% | 20% | ||
| SVP | Large T-wave | 30% | 50% | 30% |
| Large T-wave, small R-wave | ||||
| Large R-wave and T-wave | 10% |
| . | ECG parameter . | Lead I (alternate vector) . | Lead II (secondary vector) . | Lead III (primary vector) . |
|---|---|---|---|---|
| Large R-wave | ||||
| Normal subjects | Large T-wave | 40% | 10% | 20% |
| Large T-wave, small R-wave | 30% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | ||||
| TOF | Large T-wave | 30% | 20% | 10% |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | 30% | 50% | |
| Large R-wave | 10% | |||
| TGA | Large T-wave | 10% | 30% | |
| Large T-wave, small R-wave | 10% | |||
| Large R-wave and T-wave | 10% | |||
| Large R-wave | 20% | 20% | ||
| SVP | Large T-wave | 30% | 50% | 30% |
| Large T-wave, small R-wave | ||||
| Large R-wave and T-wave | 10% |
TOF, tetralogy of Fallot; TGA, transposition of great arteries; SVP, single-ventricle physiology.
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