QRS axis.horizontal plane:Angle:Pt:Reference beat:Qn:EKG
qrs axis.horizontal plane:angle:pt:reference beat:qn:ekg
QRS axis.horizontal plane:Angle:To identify measures at a point in time:Reference beat:Quantitative:EKG
qrs axis.horizontal plane:angle:to identify measures at a point in time:reference beat:quantitative:ekg