NO.1: ecg lead 3
NO.2: ecg lead 3 placement
NO.3: ecg lead 3 t wave inversion
NO.4: ecg lead 3 abnormalities
NO.5: ecg lead 3 normal
NO.6: ecg lead 3 inverted
NO.7: ecg lead 3d
NO.8: ecg lead 3 inverted t wave
NO.9: ecg lead 3 negative
NO.10: ecg lead 3 rsr